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1/26 xcl205/xcl206/XCL207 series inductor built-in step-down ?micro dc/dc? converters 0 20 40 60 80 100 0.1 1 10 100 1000 output current:i out (ma) efficency:effi(% ) vin= 5.5v 5.0v 4.2v vout=3.3v ( pwm ) xcl206/XCL207 ( pwm/ pfm ) xcl205/XCL207 typical performance characteristics greenoperation compatible applications mobile phones, smart phones bluetooth headsets wimax pdas, mids, umpcs portable game consoles digital cameras, camcorders electronic dictionaries typical application circuit etr2801-005b general description the xcl205/xcl206/XCL207 series is a synchronous step-d own micro dc/dc converter which integrates an inductor and a control ic in one tiny package (2.5mm 2.0mm, h=1.0mm). a stable power supp ly with an output current of 600ma is configured using only two capacitors connected externally. operating voltage range is from 2.0v to 6.0v . output voltage is internally set in a r ange from 0.8v to 4.0v in increments of 0.05v. the device is operated by 3.0mhz, and includes 0.42 p-channel driver transistor and 0.52 n-channel switching transistor. as for operation mode, the xc l205 series is pwm control, the xcl206 series is automatic pwm/pfm switching control and the XCL207 series can be manually switched between the pwm control mode and the automatic pwm/pfm switching control mode, allowing fast response, low ripple and hi gh efficiency over the full range of loads (from light load to heavy load). during stand-by, the device is shutdown to reduce current consumption to as low as 1.0 a or less. with the built-in uvlo (under voltage lock out) func tion, the internal driver transistor is fo rced off when input voltage becomes 1.4v or lower. xcl205b/xcl206b/XCL207b series provide short-time turn-on by the soft start function internally set in 0.25 ms (typ). xcl205b(c) /xcl206 b(c) / XCL207b(c) integrate c l auto discharge function which enables the electric charge stored at the output capacitor c l to be discharged via the internal auto-discharge switch located between the l x and v ss pins. when the devices enter stand-by mode, output voltage quickly returns to the v ss level as a result of this function. v in vss ce/mode l x v ss v out cl 10 f 4.7 f cin l1 l2 600ma (top view) * ?l1 and l x ?, and ?l2 and v out ? is connected by wiring. features ultra small : 2.5mm 2.0mm, h=1.0mm input voltage : 2.0v ~ 6.0v output voltage : 0.8v ~ 4.0v (+ 2.0%) high efficiency (v out =1.8v) : 85% (typ.) output current : 600ma oscillation frequency : 3.0mhz (+ 15%) maximum duty cycle : 100% control methods : pwm (xcl205) pwm/pfm auto (xcl206) pwm/pfm manual (XCL207) high speed soft-start circuit built-in current limiter circuit built-in (constant current & latching) low esr ceramic capacitor compatible c l high speed auto discharge * performance depends on external components and wiring on the pcb. xcl205a333xx/xcl206a333xx/XCL207a333xx xcl205/206/207 series
2/26 xcl205/xcl206/XCL207 series pin configuration pin assignment product classification ordering information xcl205 ????? -g* fixed pwm control xcl206 ????? -g* pwm / pfm automatic switching control XCL207 ????? -g* manual mode selection pin (semi-custom) pin number pin name function 1 l x switching output 2,5 v ss ground 3 v out output voltage 4 ce / mode chip enable & mode switch 6 v in power input 7 l1 8 l2 inductor electrodes designator description symbol description a low speed soft-start, no cl auto discharge b high speed soft-start, c l auto discharge functions selection (all ce active high) c low speed soft-start, c l auto discharge ? output voltage 08~40 e.g. v out =2.8v =2, =8 v out =2.85v =2, =l 0.05v increments: 0.05=a, 0.15= b, 0.25=c, 0.35=d, 0.45=e, 0.55=f, 0.65=h, 0.75= k, 0.85=l, 0.95=m oscillation frequency 3 3.0mhz device structure a control number assigned for micro dc/dc device orientation r embossed tape, standard feed (bottom view) l1 l2 7 8 v in 6 v ss 5 ce/mode 4 1 lx 2 v ss 3 v out * it should be connected the v ss pin (no. 2 and 5) to the gnd pin. * if the dissipation pad needs to be c onnected to other pins, it should be connected to the gnd pin. * please refer to pattern layout page for the connecting to pcb. * the ?-g? suffix indicates that the products are halogen and antimony free as well as being fully rohs compliant.
3/26 xcl205/xcl206/XCL207 series block diagram absolute maximum ratings ta = 2 5 parameter symbol ratings units v in pin voltage v in - 0.3 ~ 6.5 v l x pin voltage vl x - 0.3 ~ v in + 0.3 Q 6.5 v v out pin voltage v out - 0.3 ~ 6.5 v ce/mode pin voltage v ce - 0.3 ~ 6.5 v l x pin current il x 1500 ma power dissipation pd 1000 *1 mw operating temperature range topr - 20 ~ + 85 storage temperature range tstg - 40 ~ + 105 xcl205a / xcl206a / XCL207a series note: the xcl205 offers a fixed pwm control, a signal from ce/mode control logic to pwm/ pfm selector is fixed to "l" level insi de. the xcl206 control scheme is pwm/pfm automatic switching, a signal from ce/mode control logic to pwm/pfm selector is fixed to "h" level inside. the diodes placed inside ar e esd protection diodes and parasitic diodes. ce/mode r2 r1 error amp. vref with soft start, ce phase compensation pwm/pfm selector current feedback current limit pwm comparator logic synch buffer drive r3 r4 uvlo uvlo cmp ramp wave generator osc lx v ss v in v out ce/mode control logic vshort fb cfb inductor v ss l2 l1 *1: the power dissipation figure shown is pcb mounted (40mm 40mm, t=1.6mm, glass epoxy fr-4). please refer to page 16 for details. xcl205b / xcl206b / XCL207b / xcl205c / xcl206c / XCL207c series ce/mode r2 r1 error amp. vref with soft start, ce phase compensation pwm/pfm selector current feedback current limit pwm comparator logic synch buffer drive r3 r4 uvlo uvlo cmp ramp wave generator osc lx v ss v in v out ce/mode control logic ce/ vshort fb cfb v ss inductor l2 l1 note: the xcl205 offers a fixed pwm control, a signal from ce/mode control logic to pwm/ pfm selector is fixed to "l" level insi de. the xcl206 control scheme is pwm/pfm automatic switching, a signal from ce/mode control logic to pwm/pfm selector is fixed to "h" level inside. the diodes placed inside ar e esd protection diodes and parasitic diodes.
4/26 xcl205/xcl206/XCL207 series electrical characteristics xcl205a123ar/xcl206a123ar/XCL207a123ar, v out =1.2v, f osc =3.0mhz, ta=25 parameter symbol conditions min. typ. max. units circuit output voltage v out when connected to external components, v in =v ce =5.0v, i out =30ma 1.176 1.200 1.224 v operating voltage range v in 2.0 - 6.0 v maximum output current i outmax v in =v out(t) +2.0v, v ce =1.0v when connected to external components (*9) 600 - - ma uvlo voltage v uvlo v ce =v in ,v out =0v, voltage which lx pin holding ?l? level (*1, *11) 1.00 1.40 1.78 v supply current (xcl205) - 46 65 supply current (xcl206, XCL207) i dd v in =v ce =5.0v, v out =v out(t) 1.1v - 21 35 a stand-by current i stb v in =5.0v, v ce =0v, v out =v out(t) 1.1v - 0 1.0 a oscillation frequency f osc when connected to external components, v in =v out(t) +2.0v,v ce =1.0v, i out =100ma 2550 3000 3450 khz pfm switching current (*12) i pfm when connected to external components, v in =v out(t) +2.0v, v ce =v in , i out =1ma (*12) 190 260 350 ma pfm duty limit (*12) dty limit_pfm v ce = v in =(c-1) i out =1ma (*12) - 200 300 % maximum duty cycle d max v in =v ce =5.0v, v out =v out (t) 0.9v 100 - - % minimum duty cycle d min v in =v ce =5.0v, v out =v out (t) 1.1v - - 0 % efficiency effi when connected to external components, v ce =v in v out (t) +1.2v, i out = 100ma - 82 - % lx sw "h" on resistance 1 r l h v in =v ce =5.0v, v out =0v, il x =100ma (*3) - 0.35 0.55 lx sw "h" on resistance 2 r l h v in =v ce =3.6v, v out =0v, il x =100ma (*3) - 0.42 0.67 lx sw "l" on resistance 1 r l l v in =v ce =5.0v (*4) - 0.45 0.66 - lx sw "l" on resistance 2 r l l v in =v ce =3.6v, (*4) - 0.52 0.77 - lx sw "h" leak current (*5) ileakh v in =v out =5.0v, v ce =0v, l x =0v - 0.01 1.0 a lx sw "l" leak current (*5) ileakl v in =v out =5.0v, v ce =0v, l x = 5.0v - 0.01 1.0 a current limit (*10) i lim v in =v ce =5.0v, v out =v out (e) 0.9v (*8) 900 1050 1350 ma output voltage temperature characteristics v out / (v out ? topr) i out =30ma -40 Q topr Q 85 - 100 - ppm/ ce "h" voltage v ceh v out =0v, applied voltage to v ce , voltage changes lx to ?h? level (*11) 0.65 - v in v ce "l" voltage v cel v out =0v, applied voltage to v ce , voltage changes lx to ?l? level (*11) v ss - 0.25 v pwm "h" level voltage (*13) v pwmh when connected to external components, i out =1ma (*6), voltage which oscillation frequency becomes 2550khz Q f osc Q 3450khz (*13) - - v in - 1.0 v pwm "l" level voltage (*13) v pwml when connected to external components, i out =1ma (*6) , voltage which oscillation frequency becomes f osc 2550khz (*13) v in - 0.25 - - v ce "h" current i ceh v in =v ce =5.0v, v out =0v - 0.1 - 0.1 a ce "l" current i cel v in =5.0v, v ce =0v, v out =0v - 0.1 - 0.1 a soft start time t ss when connected to external components, v ce =0v v in , i out =1ma 0.5 0.9 2.5 ms latch time t lat v in = v ce =5.0v, v out =0.8 v out (t) short lx at 1 resistance (*7) 1.0 - 20 ms short protection threshold voltage v short sweeping v out , v in =v ce =5.0v, short lx at 1 resistance, v out voltage which lx becomes ?l? level within 1ms 0.450 0.600 0.750 v inductance value l test frequency=1mhz - 1.5 - h allowed inductor current i dc t=40 - 1000 - ma test conditions: unless otherwise stated, v in =5.0v, v out (t) =nominal voltage note: *1: including hysteresis operating voltage range. *2: effi = { ( output voltage output current ) / ( input voltage input current) } 100 *3: on resistance ( )= (v in - lx pin measurement voltage) / 100ma *4: design value *5: when temperature is high, a current of approximately 10 a (maximum) may leak. *6: the ce/mode pin of the XCL207 series works also as an external switching pin of pwm control and pwm/pfm control. when the ic is in the operation, control is switched to the automatic pwm/pfm switching mode when the ce/mode pin voltage is equal to or greater than v in minus 0.3v, and to the pwm mode when the ce/mode pin voltage is equal to or lower than v in minus 1.0v and equal to or greater than v ceh . *7: time until it short-circuits v out with gnd via 1 of resistor from an operational state and is set to lx=0v from current limit pulse generating. *8: when v in is less than 2.4v, limit current may not be reached because voltage falls caused by on resistance. *9: when the difference between the input and the output is small, some cycles may be skipped completely before current maximiz es. if current is further pulled from this state, output voltage will decrease because of p-ch driver on resistance. *10: current limit denotes the level of detection at peak of coil current. *11: ?h?=v in ~v in -1.2v, ?l?=+0.1v~-0.1v *12: i pfm and dty limit_pfm are defined only for the xcl206 and XCL207 series which have pfm control function. (not for the xcl 205 series) *13: v pwmh and v pwml are defined onl y for the XCL207 series. ( the y are not used in the xcl205/and xcl206 series )
5/26 xcl205/xcl206/XCL207 series electrical characteristics (continued) xcl205a183ar/xcl206a183ar/XCL207a183ar, v out =1.8v, f osc =3.0mhz, ta=25 parameter symbol conditions min. typ. max. units circuit output voltage v out when connected to external components, v in =v ce =5.0v, i out =30ma 1.764 1.800 1.836 v operating voltage range v in 2.0 - 6.0 v maximum output current i outmax v in =v out(e) +2.0v, v ce =1.0v when connected to external components (*9) 600 - - ma uvlo voltage v uvlo v ce =v in ,v out =0v, voltage which lx pin holding ?l? level (*1, *11) 1.00 1.40 1.78 v supply current (xcl205) - 46 65 supply current (xcl206, XCL207) i dd v in =v ce =5.0v, v out =v out(t) 1.1v - 21 35 a stand-by current i stb v in =5.0v, v ce =0v, v out =v out(t) 1.1v - 0 1.0 a oscillation frequency f osc when connected to external components, v in =v out(t) +2.0v,v ce =1.0v, i out =100ma 2550 3000 3450 khz pfm switching current (*12) i pfm when connected to external components, v in =v out(t) +2.0v, v ce =v in , i out =1ma (*12) 170 220 270 ma pfm duty limit (*12) dty limit_pfm v ce = v in =(c-1) i out =1ma (*12) - 200 300 % maximum duty cycle d max v in =v ce =5.0v, v out =v out (t) 0.9v 100 - - % minimum duty cycle d min v in =v ce =5.0v, v out =v out (t) 1.1v - - 0 % efficiency effi when connected to external components, v ce =v in v out (t) +1.2v, i out = 100ma - 85 - % lx sw "h" on resistance 1 r l h v in =v ce =5.0v, v out =0v, il x =100ma (*3) - 0.35 0.55 lx sw "h" on resistance 2 r l h v in =v ce =3.6v, v out =0v, il x =100ma (*3) - 0.42 0.67 lx sw "l" on resistance 1 r l l v in =v ce =5.0v (*4) - 0.45 0.66 - lx sw "l" on resistance 2 r l l v in =v ce =3.6v, (*4) - 0.52 0.77 - lx sw "h" leak current (*5) ileakh v in =v out =5.0v, v ce =0v, l x =0v - 0.01 1.0 a lx sw "l" leak current (*5) ileakl v in =v out =5.0v, v ce =0v, l x = 5.0v - 0.01 1.0 a current limit (*10) i lim v in =v ce =5.0v, v out =v out (e) 0.9v (*8) 900 1050 1350 ma output voltage temperature characteristics v out / (v out ? topr) i out =30ma -40 Q topr Q 85 - 100 - ppm/ ce "h" voltage v ceh v out =0v, applied voltage to v ce , voltage changes lx to ?h? level (*11) 0.65 - v in v ce "l" voltage v cel v out =0v, applied voltage to v ce , voltage changes lx to ?l? level (*11) v ss - 0.25 v pwm "h" level voltage (*13) v pwmh when connected to external components, i out =1ma (*6), voltage which oscillation frequency becomes 2550khz Q f osc Q 3450khz (*13) - - v in - 1.0 v pwm "l" level voltage (*13) v pwml when connected to external components, i out =1ma (*6) , voltage which oscillation frequency becomes f osc 2550khz (*13) v in - 0.25 - - v ce "h" current i ceh v in =v ce =5.0v, v out =0v - 0.1 - 0.1 a ce "l" current i cel v in =5.0v, v ce =0v, v out =0v - 0.1 - 0.1 a soft start time t ss when connected to external components, v ce =0v v in , i out =1ma 0.5 0.9 2.5 ms latch time t lat v in = v ce =5.0v, v out =0.8 v out (t) short lx at 1 resistance (*7) 1.0 - 20 ms short protection threshold voltage v short sweeping v out , v in =v ce =5.0v, short lx at 1 resistance, v out voltage which lx becomes ?l? level within 1ms 0.675 0.900 1.125 v inductance value l test frequency =1mhz - 1.5 - h allowed inductor current i dc t=40 - 1000 - ma test conditions: unless otherwise stated, v in =5.0v, v out (t) =nominal voltage note: *1: including hysteresis operating voltage range. *2: effi = { ( output voltage output current ) / ( input voltage input current) } 100 *3: on resistance ( )= (v in - lx pin measurement voltage) / 100ma *4: design value *5: when temperature is high, a current of approximately 10 a (maximum) may leak. *6: the ce/mode pin of the XCL207 series works also as an external switching pin of pwm control and pwm/pfm control. when the ic is in the operation, control is switched to the automatic pwm/pfm switching mode when the ce/mode pin voltage is equal to or greater than v in minus 0.3v, and to the pwm mode when the ce/mode pin voltage is equal to or lower than v in minus 1.0v and equal to or greater than v ceh . *7: time until it short-circuits v out with gnd via 1 of resistor from an operational state and is set to lx=0v from current limit pulse generating. *8: when v in is less than 2.4v, limit current may not be reached because voltage falls caused by on resistance. *9: when the difference between the input and the output is small, some cycles may be skipped completely before current maximiz es. if current is further pulled from this state, output voltage will decrease because of p-ch driver on resistance. *10: current limit denotes the level of detection at peak of coil current. *11: ?h?=v in ~v in -1.2v, ?l?=+0.1v~-0.1v *12: ipfm and dty limit_pfm are defined only for the xcl206 and XCL207 series which have pfm control function. (not for the xcl 205 series) *13: v pwmh and v pwml are defined only for the XCL207 series. (they are not used in the xcl205/and xcl206 series)
6/26 xcl205/xcl206/XCL207 series electrical characteristics (continued) xcl205b123ar/xcl206b123ar/ XCL207b123ar, v out =1.2v, f osc =3.0mhz, ta=25 parameter symbol conditions min. typ. max. units circuit output voltage v out when connected to external components, v in =v ce =5.0v, i out =30ma 1.176 1.200 1.224 v operating voltage range v in 2.0 - 6.0 v maximum output current i outmax v in =v out(t) +2.0v, v ce =1.0v when connected to external components (*9) 600 - - ma uvlo voltage v uvlo v ce =v in ,v out =0v, voltage which lx pin holding ?l? level (*1, *11) 1.00 1.40 1.78 v supply current (xcl205) - 46 65 supply current (xcl206, XCL207) i dd v in =v ce =5.0v, v out =v out(t) 1.1v - 21 35 a stand-by current i stb v in =5.0v, v ce =0v, v out =v out(t) 1.1v - 0 1.0 a oscillation frequency f osc when connected to external components, v in =v out(t) +2.0v,v ce =1.0v, i out =100ma 2550 3000 3450 khz pfm switching current (*12) i pfm when connected to external components, v in =v out(t) +2.0v, v ce = v in , i out =1ma (*12) 190 260 350 ma pfm duty limit (*12) dty limit_pfm v ce =v in =(c-1) i out =1ma (*12) - 200 300 % maximum duty cycle d max v in =v ce =5.0v, v out =v out (t) 0.9v 100 - - % minimum duty cycle d min v in =v ce =5.0v, v out =v out (t) 1.1v - - 0 % efficiency effi when connected to external components, v ce =v in v out (t) +1.2v, i out =100ma - 82 - % lx sw "h" on resistance 1 r l h v in =v ce =5.0v, v out =0v, il x =100ma (*3) - 0.35 0.55 lx sw "h" on resistance 2 r l h v in =v ce =3.6v, v out =0v, il x =100ma (*3) - 0.42 0.67 lx sw "l" on resistance 1 r l l v in =v ce =5.0v (*4) - 0.45 0.66 - lx sw "l" on resistance 2 r l l v in =v ce = 3.6v (*4) - 0.52 0.77 - lx sw "h" leak current (*5) ileakh v in =v out =5.0v, v ce =0v, l x =0v - 0.01 1.0 a current limit (*10) i lim v in =v ce =5.0v, v out =v out (t) 0.9v (*8) 900 1050 1350 ma output voltage temperature characteristics v out / (v out ? topr) i out =30ma -40 Q topr Q 85 - 100 - ppm/ ce "h" voltage v ceh v out =0v, applied voltage to v ce , voltage changes lx to ?h? level (*11) 0.65 - v in v ce "l" voltage v cel v out =0v, applied voltage to v ce , voltage changes lx to ?l? level (*11) v ss - 0.25 v pwm "h" level voltage (*13) v pwmh when connected to external components, i out =1ma (*6), voltage which oscillation frequency becomes 2550khz Q f osc Q 3450khz (*13) - - v in - 1.0 v pwm "l" level voltage (*13) v pwml when connected to external components, i out =1ma (*6) , voltage which oscillation frequency becomes f osc 2550khz (*13) v in - 0.25 - - v ce "h" current i ceh v in =v ce =5.0v, v out =0v - 0.1 - 0.1 a ce "l" current i cel v in =5.0v, v ce =0v, v out =0v - 0.1 - 0.1 a soft start time t ss when connected to external components, v ce =0v v in , i out =1ma - 0.25 0.40 ms latch time t lat v in =v ce =5.0v, v out =0.8 v out(t) short lx at 1 resistance (*7) 1.0 - 20 ms short protection threshold voltage v short sweeping v out , v in =v ce =5.0v, short lx at 1 resistance, v out voltage which lx becomes ?l? level within 1ms 0.450 0.600 0.750 v cl discharge r dchg v in =5.0v, l x =5.0v, v ce =0v, v out =open 200 300 450 inductance value l test frequency =1mhz - 1.5 - h allowed inductor current i dc t=40 - 1000 - ma test conditions: unless otherwise stated, v in =5.0v, v out (t) =nominal voltage note: *1: including hysteresis operating voltage range. *2: effi = { ( output voltage output current ) / ( input voltage input current) } 100 *3: on resistance ( )= (v in - lx pin measurement voltage) / 100ma *4: design value *5: when temperature is high, a current of approximately 10 a (maximum) may leak. *6: the ce/mode pin of the XCL207 series works also as an external switching pin of pwm control and pwm/pfm control. when the ic is in the operation, control is switched to the automatic pwm/pfm switching mode when the ce/mode pin voltage is equal to or greater than v in minus 0.3v, and to the pwm mode when the ce/mode pin voltage is equal to or lower than v in minus 1.0v and equal to or greater than v ceh . *7: time until it short-circuits v out with gnd via 1 of resistor from an operational state and is set to lx=0v from current limit pulse generating. *8: when v in is less than 2.4v, limit current may not be reached because voltage falls caused by on resistance. *9: when the difference between the input and the output is small, some cycles may be skipped completely before current maximiz es. if current is further pulled from this state, output voltage will decrease because of p-ch driver on resistance. *10: current limit denotes the level of detection at peak of coil current. *11: ?h?=v in ~v in -1.2v, ?l?=+0.1v~-0.1v *12: i pfm and dty limit_pfm are defined only for the xcl206 and XCL207 series which have pfm control function. (not for the xcl 205 series) *13: v pwmh and v pwml are defined only for the XCL207 series. (they are not used in the xcl205/and xcl206 series)
7/26 xcl205/xcl206/XCL207 series electrical characteristics (continued) xcl205 b183ar/xcl206 b183ar/ XCL207b183ar, v out =1.8v, f osc =3.0mhz, ta=25 parameter symbol conditions min. typ. max. units circuit output voltage v out when connected to external components, v in =v ce =5.0v, i out =30ma 1.764 1.800 1.836 v operating voltage range v in 2.0 - 6.0 v maximum output current i outmax v in =v out(e) +2.0v, v ce =1.0v when connected to external components (*9) 600 - - ma uvlo voltage v uvlo v ce =v in ,v out =0v, voltage which lx pin holding ?l? level (*1, *11) 1.00 1.40 1.78 v supply current (xcl205) - 46 65 supply current (xcl206, XCL207) i dd v in =v ce =5.0v, v out =v out(t) 1.1v - 21 35 a stand-by current i stb v in =5.0v, v ce =0v, v out =v out(t) 1.1v - 0 1.0 a oscillation frequency f osc when connected to external components, v in =v out(t) +2.0v,v ce =1.0v, i out =100ma 2550 3000 3450 khz pfm switching current (*12) i pfm when connected to external components, v in =v out(t) +2.0v, v ce = v in , i out =1ma (*12) 170 220 270 ma pfm duty limit (*12) dty limit_pfm v ce =v in =(c-1) i out =1ma (*12) - 200 300 % maximum duty cycle d max v in =v ce =5.0v, v out =v out (t) 0.9v 100 - - % minimum duty cycle d min v in =v ce =5.0v, v out =v out (t) 1.1v - - 0 % efficiency effi when connected to external components, v ce =v in v out (t) +1.2v, i out =100ma - 85 - % lx sw "h" on resistance 1 r l h v in =v ce =5.0v, v out =0v, il x =100ma (*3) - 0.35 0.55 lx sw "h" on resistance 2 r l h v in =v ce =3.6v, v out =0v, il x =100ma (*3) - 0.42 0.67 lx sw "l" on resistance 1 r l l v in =v ce =5.0v (*4) - 0.45 0.66 - lx sw "l" on resistance 2 r l l v in =v ce = 3.6v (*4) - 0.52 0.77 - lx sw "h" leak current (*5) ileakh v in =v out =5.0v, v ce =0v, l x =0v - 0.01 1.0 a current limit (*10) i lim v in =v ce =5.0v, v out =v out (t) 0.9v (*8) 900 1050 1350 ma output voltage temperature characteristics v out / (v out ? topr) i out =30ma -40 Q topr Q 85 - 100 - ppm/ ce "h" voltage v ceh v out =0v, applied voltage to v ce , voltage changes lx to ?h? level (*11) 0.65 - v in v ce "l" voltage v cel v out =0v, applied voltage to v ce , voltage changes lx to ?l? level (*11) v ss - 0.25 v pwm "h" level voltage (*13) v pwmh when connected to external components, i out =1ma (*6), voltage which oscillation frequency becomes 2550khz Q f osc Q 3450khz (*13) - - v in - 1.0 v pwm "l" level voltage (*13) v pwml when connected to external components, i out =1ma (*6) , voltage which oscillation frequency becomes f osc 2550khz (*13) v in - 0.25 - - v ce "h" current i ceh v in =v ce =5.0v, v out =0v - 0.1 - 0.1 a ce "l" current i cel v in =5.0v, v ce =0v, v out =0v - 0.1 - 0.1 a soft start time t ss when connected to external components, v ce =0v v in , i out =1ma - 0.32 0.50 ms latch time t lat v in =v ce =5.0v, v out =0.8 v out(t) short lx at 1 resistance (*7) 1.0 - 20 ms short protection threshold voltage v short sweeping v out , v in =v ce =5.0v, short lx at 1 resistance, v out voltage which lx becomes ?l? level within 1ms 0.675 0.900 1.125 v cl discharge r dchg v in =5.0v, l x =5.0v, v ce =0v, v out =open 200 300 450 inductance value l test frequency =1mhz - 1.5 - h allowed inductor current i dc t=40 - 1000 - ma test conditions: unless otherwise stated, v in =5.0v, v out (t) = nominal voltage note: *1: including hysteresis operating voltage range. *2: effi = { ( output voltage output current ) / ( input voltage input current) } 100 *3: on resistance ( )= (v in - lx pin measurement voltage) / 100ma *4: design value *5: when temperature is high, a current of approximately 10 a (maximum) may leak. *6: the ce/mode pin of the XCL207 series works also as an external switching pin of pwm control and pwm/pfm control. when the ic is in the operation, control is switched to the automatic pwm/pfm switching mode when the ce/mode pin voltage is equal to or greater than v in minus 0.3v, and to the pwm mode when the ce/mode pin voltage is equal to or lower than v in minus 1.0v and equal to or greater than v ceh . *7: time until it short-circuits v out with gnd via 1 of resistor from an operational state and is set to lx=0v from current limit pulse generating. *8: when v in is less than 2.4v, limit current may not be reached because voltage falls caused by on resistance. *9: when the difference between the input and the output is small, some cycles may be skipped completely before current maximiz es. if current is further pulled from this state, output voltage will decrease because of p-ch driver on resistance. *10: current limit denotes the level of detection at peak of coil current. *11: ?h?=v in ~v in -1.2v, ?l?=+0.1v~-0.1v *12: i pfm and dty limit_pfm are defined only for the xcl206 and XCL207 series which have pfm control function. (not for the xcl 205 series) *13: v pwmh and v pwml are defined only for the XCL207 series. (they are not used in the xcl205/and xcl206 series)
8/26 xcl205/xcl206/XCL207 series electrical characteristics (continued) xcl205c123ar/xcl206c123ar/ XCL207c123ar, v out =1.2v, f osc =3.0mhz, ta=25 parameter symbol conditions min. typ. max. units circuit output voltage v out when connected to external components, v in = v ce =5.0v, i out =30ma 1.176 1.200 1.224 v operating voltage range v in 2.0 - 6.0 v maximum output current i outmax v in =v out(e) +2.0v, v ce =1.0v when connected to external components (*9) 600 - - ma uvlo voltage v uvlo v ce =v in ,v out =0v, voltage which lx pin holding ?l? level (*1, *11) 1.00 1.40 1.78 v supply current (xcl205) - 46 65 supply current (xcl206, XCL207) i dd v in =v ce =5.0v, v out = v out(t) 1.1v 21 35 a stand-by current i stb v in =5.0v, v ce =0v, v out = v out(t) 1.1v - 0 1.0 a oscillation frequency f osc when connected to external components, v in =v out(t) +2.0v,v ce =1.0v, i out =100ma 2550 3000 3450 khz pfm switching current (*12) i pfm when connected to external components, v in =v out(t) +2.0v, v ce = v in , i out =1ma 190 260 350 ma pfm duty limit (*12) dty limit_pfm v ce = v in =(c-1) i out =1ma - 200 300 % maximum duty cycle maxdty v in = v ce =5.0v, v out = v out (t) 0.9v 100 - - % minimum duty cycle mindty v in = v ce =5.0v, v out = v out (t) 1.1v - - 0 % efficiency effi when connected to external components, v ce = v in v out (t) +1.2v, i out = 100ma - 82 - % lx sw "h" on resistance 1 r l h v in = v ce = 5.0v, v out = 0v,il x = 100ma (*3) - 0.35 0.55 lx sw "h" on resistance 2 r l h v in = v ce = 3.6v, v out = 0v,il x = 100ma (*3) - 0.42 0.67 lx sw "l" on resistance 1 r l l v in = v ce = 5.0v (*4) - 0.45 0.66 - lx sw "l" on resistance 2 r l l v in = v ce = 3.6v (*4) - 0.52 0.77 - lx sw "h" leak current (*5) ileakh v in = v out =5.0v, v ce =0v, l x =0v - 0.01 1.0 a current limit (*10) i lim v in = v ce = 5.0v, v out = v out (t) 0.9v (*8) 900 1050 1350 ma output voltage temperature characteristics v out / (v out ? topr) i out =30ma -40 Q topr Q 85 - 100 - ppm/ ce "h" voltage v ceh v out =0v, applied voltage to v ce , voltage changes lx to ?h? level (*11) 0.65 - 6.0 v ce "l" voltage v cel v out =0v, applied voltage to v ce , voltage changes lx to ?l? level (*11) v ss - 0.25 v pwm "h" level voltage (*13) v pwmh when connected to external components, i out =1ma (*6), voltage which oscillation frequency becomes 2550khz Q f osc Q 3450khz (*13) - - v in - 1.0 v pwm "h" level voltage (*13) v pwml when connected to external components, i out =1ma (*6) , voltage which oscillation frequency becomes f osc 2550khz (*13) v in - 0.25 - - v ce "h" current i ceh v in = v ce =5.0v, v out = 0v - 0.1 - 0.1 a ce "l" current i cel v in =5.0v, v ce = 0v, v out = 0v - 0.1 - 0.1 a soft start time t ss when connected to external components, v ce =0v v in , i out =1ma 0.5 0.9 2.5 ms latch time t lat v in =v ce =5.0v, v out =0.8 v out(t) short lx at 1 resistance (*7) 1.0 - 20 ms short protection threshold voltage v short sweeping v out , v in =v ce =5.0v, short lx at 1 resistance, v out voltage which lx becomes ?l? level within 1ms 0.450 0.600 0.750 v cl discharge r dchg v in = 5.0v l x = 5.0v v ce = 0v v out = open 200 300 450 inductance value l test frequency=1mhz - 1.5 - h- allowed inductor current i dc t=40 - 1000 - ma - test conditions: unless otherwise stated, v in =5.0v, v out (t) = nominal voltage note: *1: including hysteresis operating voltage range. *2: effi = { ( output voltage output current ) / ( input voltage input current) } 100 *3: on resistance ( )= (v in - lx pin measurement voltage) / 100ma *4: design value *5: when temperature is high, a current of approximately 10 a (maximum) may leak. *6: the ce/mode pin of the XCL207 series works also as an external switching pin of pwm control and pwm/pfm control. when the ic is in the operation, control is switched to the automatic pwm/pfm switching mode when the ce/mode pin voltage is equal to or greater than v in minus 0.3v, and to the pwm mode when the ce/mode pin voltage is equal to or lower than v in minus 1.0v and equal to or greater than v ceh . *7: time until it short-circuits v out with gnd via 1 of resistor from an operational state and is set to lx=0v from current limit pulse generating. *8: when v in is less than 2.4v, limit current may not be reached because voltage falls caused by on resistance. *9: when the difference between the input and the output is small, some cycles may be skipped completely before current maximiz es. if current is further pulled from this state, output voltage will decrease because of p-ch driver on resistance. *10: current limit denotes the level of detection at peak of coil current. *11: ?h?=v in ~v in -1.2v, ?l?=+0.1v~-0.1v *12: i pfm and dty limit_pfm are defined only for the xcl206 and XCL207 series which have pfm control function. (not for the xcl 205 series) *13: v pwmh and v pwml are defined only for the XCL207 series. (they are not used in the xcl205/and xcl206 series)
9/26 xcl205/xcl206/XCL207 series electrical characteristics (continued) xcl205c183ar/xcl206c183ar/ XCL207c183ar, v out =1.8v, f osc =3.0mhz, ta=25 parameter symbol conditions min. typ. max. units circuit output voltage v out when connected to external components, v in = v ce =5.0v, i out =30ma 1.764 1.800 1.836 v operating voltage range v in 2.0 - 6.0 v maximum output current i outmax v in =v out(e) +2.0v, v ce =1.0v when connected to external components (*9) 600 - - ma uvlo voltage v uvlo v ce =v in ,v out =0v, voltage which lx pin holding ?l? level (*1, *11) 1.00 1.40 1.78 v supply current (xcl205) - 46 65 supply current (xcl206, XCL207) i dd v in =v ce =5.0v, v out = v out(t) 1.1v - 21 35 a stand-by current i stb v in =5.0v, v ce =0v, v out = v out(t) 1.1v - 0 1.0 a oscillation frequency f osc when connected to external components, v in =v out(t) +2.0v,v ce =1.0v, i out =100ma 2550 3000 3450 khz pfm switching current (*12) i pfm when connected to external components, v in =v out(t) +2.0v, v ce = v in , i out =1ma 170 220 270 ma pfm duty limit (*12) dty limit_pfm v ce = v in =(c-1) i out =1ma - 200 300 % maximum duty cycle maxdty v in = v ce =5.0v, v out = v out (t) 0.9v 100 - - % minimum duty cycle mindty v in = v ce =5.0v, v out = v out (t) 1.1v - - 0 % efficiency effi when connected to external components, v ce = v in v out (t) +1.2v, i out = 100ma - 85 - % lx sw "h" on resistance 1 r l h v in = v ce = 5.0v, v out = 0v,il x = 100ma (*3) - 0.35 0.55 lx sw "h" on resistance 2 r l h v in = v ce = 3.6v, v out = 0v,il x = 100ma (*3) - 0.42 0.67 lx sw "l" on resistance 1 r l l v in = v ce = 5.0v (*4) - 0.45 0.66 - lx sw "l" on resistance 2 r l l v in = v ce = 3.6v (*4) - 0.52 0.77 - lx sw "h" leak current (*5) ileakh v in = v out =5.0v, v ce =0v, l x =0v - 0.01 1.0 a current limit (*10) i lim v in = v ce = 5.0v, v out = v out (t) 0.9v (*8) 900 1050 1350 ma output voltage temperature characteristics v out / (v out ? topr) i out =30ma -40 Q topr Q 85 - 100 - ppm/ ce "h" voltage v ceh v out =0v, applied voltage to v ce , voltage changes lx to ?h? level (*11) 0.65 - 6.0 v ce "l" voltage v cel v out =0v, applied voltage to v ce , voltage changes lx to ?l? level (*11) v ss - 0.25 v pwm "h" level voltage (*13) v pwmh when connected to external components, i out =1ma (*6), voltage which oscillation frequency becomes 2550khz Q f osc Q 3450khz (*13) - - v in - 1.0 v pwm "h" level voltage (*13) v pwml when connected to external components, i out =1ma (*6) , voltage which oscillation frequency becomes f osc 2550khz (*13) v in - 0.25 - - v ce "h" current i ceh v in = v ce =5.0v, v out = 0v - 0.1 - 0.1 a ce "l" current i cel v in =5.0v, v ce = 0v, v out = 0v - 0.1 - 0.1 a soft start time t ss when connected to external components, v ce =0v v in , i out =1ma 0.5 0.9 2.5 ms latch time t lat v in =v ce =5.0v, v out =0.8 v out(t) short lx at 1 resistance (*7) 1.0 - 20 ms short protection threshold voltage v short sweeping v out , v in =v ce =5.0v, short lx at 1 resistance, v out voltage which lx becomes ?l? level within 1ms 0.675 0.900 1.125 v cl discharge r dchg v in = 5.0v l x = 5.0v v ce = 0v v out = open 200 300 450 inductance value l test frequency=1mhz - 1.5 - h- allowed inductor current i dc t=40 - 1000 - ma - test conditions: unless otherwise stated, v in =5.0v, v out (t) = nominal voltage note: *1: including hysteresis operating voltage range. *2: effi = { ( output voltage output current ) / ( input voltage input current) } 100 *3: on resistance ( )= (v in - lx pin measurement voltage) / 100ma *4: design value *5: when temperature is high, a current of approximately 10 a (maximum) may leak. *6: the ce/mode pin of the XCL207 series works also as an external switching pin of pwm control and pwm/pfm control. when the ic is in the operation, control is switched to the automatic pwm/pfm switching mode when the ce/mode pin voltage is equal to or greater than v in minus 0.3v, and to the pwm mode when the ce/mode pin voltage is equal to or lower than v in minus 1.0v and equal to or greater than v ceh . *7: time until it short-circuits v out with gnd via 1 of resistor from an operational state and is set to lx=0v from current limit pulse generating. *8: when v in is less than 2.4v, limit current may not be reached because voltage falls caused by on resistance. *9: when the difference between the input and the output is small, some cycles may be skipped completely before current maximiz es. if current is further pulled from this state, output voltage will decrease because of p-ch driver on resistance. *10: current limit denotes the level of detection at peak of coil current. *11: ?h?=v in ~v in -1.2v, ?l?=+0.1v~-0.1v *12: i pfm and dty limit_pfm are defined only for the xcl206 and XCL207 series which have pfm control function. (not for the xcl 205 series) *13: v pwmh and v pwml are defined only for the XCL207 series. (they are not used in the xcl205/and xcl206 series)
10/26 xcl205/xcl206/XCL207 series electrical characteristics (continued) pfm switching current (i pfm ) by nominal output voltage (xcl206/XCL207 series) nominal output voltage min. typ. max. 0.8v Q v out(t) Q 1.2v 190ma 260ma 350ma 1.2v v out(t) 1.8v 180ma 240ma 300ma 1.8v Q v out(t) Q 4.0v 170ma 220ma 270ma input voltage (v in ) for pfm duty limit (xcl206/XCL207 series) f osc 3.0mhz v in voltage (c-1) v out(t) +1.0v minimum voltage (c-1) is 2.0v. soft-start time, nominal output voltage xcl205b/xcl206b/XCL207b series series f osc nominal output voltage min. typ. max. 0.8v Q v out(t) <1.8v - 0.25ms 0.40ms xcl205b/ xcl206b/XCL207b 3.0mhz 1.8v Q v out(t) Q 4.0v - 0.32ms 0.50ms typical application circuit xcl205/xcl206/XCL207 series external components c in : 10v/4.7 f (ceramic) c l : 6.3v/10 f (ceramic) note the inductor can be used only for this dc/dc converter. please do not use this inducto r for the other reasons. v vss v ss lx v out in ce/mode l1 l2 c c in l
11/26 xcl205/xcl206/XCL207 series operational description the xcl205/xcl/206/XCL207 series consists of a reference voltage source, ramp wave ci rcuit, error amplifier, pwm comparator, phase compensation circuit, out put voltage adjustment resistors, p-channel mosfet driver transistor, n-channel mosfet switching transistor for the synchr onous switch, current limiter circuit, uvlo circuit with control ic, and an inductor. (see the block diagram above.) using the erro r amplifier, the voltage of the internal voltage reference source is compared with the feedback voltage from the v out pin through split resistors, r1 and r2. phase compensation is performed on the resulting error amplifier output, to input a signal to the pwm comparator to determine the turn-on time during pwm operation. the pwm comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circu it, and delivers the resulting output to the buffer driver circuit to cause the lx pin to output a switching duty cycle. this proc ess is continuously performed to ensure stable output voltage. the current feedback circ uit monitors the p-channel mos driver transistor current for each switching operation, and modulates t he error amplifier output signal to provide multiple feedback signals. this enables a stable feedback loop even when a lo w esr capacitor such as a ceramic capacitor is used ensuring stable output voltage. the reference voltage source provides the reference voltage to ensure stable output voltage of the dc/dc converter. the ramp wave circuit determines switching frequency. the frequenc y is fixed internally 3.0mhz. clock pulses generated in this circuit are used to produce ramp waveforms needed for pw m operation, and to synchronize all the internal circuits. the error amplifier is designed to monitor output voltage. the amplifier compares the refe rence voltage with the feedback voltage divided by the internal split resistors, r1 and r2. when a feed back voltage is lower than the reference voltage, the output voltage of the error amplifier is in creased. the gain and frequency characteristic s of the error amplifier output are f ixed internally to deli ver an optimized signal to the mixer. the current limiter circuit of the xcl205/ xcl206/XCL207 series monitors the current flowing through the p-channel mos driver transistor connected to the lx pin, and features a combinati on of the current limit mode a nd the operation suspension mode. when the driver current is greater than a s pecific level, the current lim it function operates to turn off the pulses from the l x pin at any given timing. when the driver transistor is turned off, the limiter circuit is then released from the cu rrent limit det ection state. at the next pulse, the driver transistor is turned on. however, the transistor is immediately tu rned off in the case of an ove r current state. when the over current state is eliminated, the ic resumes its normal operation. the ic waits for the over current state to end by repeating the steps through . if an over current state continues for a few milliseconds and the above three steps are r epeatedly performed, the ic performs the func tion of latching the off state of the driver transistor, and goes into operation sus pension state. once the ic is in sus pension state, operations can be resumed by either turning the ic off via the ce/mode pin, or by restoring power to the v in pin. the suspension state does not mean a complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation. the current limit of the xcl2 05/xcl206/XCL207 series can be set at 1050ma at typi cal. depending on the st ate of the pc board, latch time may become longer and latch operation may not work. in order to avoid the effect of noise, an input capacitor is placed as close to the ic as possible. limit > # ms current limit level 0ma i out v lx in v ce v lx vss r esta r t limit < # ms
12/26 xcl205/xcl206/XCL207 series operational description (continued) the short-circuit protection circuit monitors the internal r1 and r2 divider voltage from the v out pin (refer to fb point in the block diagram shown in the previous page). in case where output is accidentally shorted to the ground and when the fb point voltage decreases less than half of the refe rence voltage (vref) and a current more than the i lim flows to the driver transistor, the short-circuit protection qui ckly operates to turn off and to latch the driver transistor. in the latch state, the operation can be resumed by either turning the ic off and on vi a the ce/mode pin, or by restoring power supply to the v in pin. when sharp load transient happe ns, a voltage drop at the v out is propagated to the fb point through c fb , as a result, short circuit protection may operate in the voltage higher than 1/2 v out voltage. when the v in pin voltage becomes 1.4v or lower, the p-channel output driver transistor is forced off to prevent false pulse output caused by unstable oper ation of the internal circuitry. when the v in pin voltage becomes 1. 8v or higher, switching operation takes place. by releasing the uv lo function, the ic performs the soft start function to initiate output startup oper ation. the soft start function operates even when the v in pin voltage falls momentarily below th e uvlo operating voltage. the uvlo circuit does not cause a complete shutdown of the ic, but causes pulse output to be suspended; theref ore, the internal circuitr y remains in operation. in pfm control operation, until coil cu rrent reaches to a specified level (i pfm ), the ic keeps the p-ch mosfet on. in this case, on-time (t on ) that the p-ch mosfet is kept on can be given by the following formula. t on = l i pfm / (v in v out ) i pfm in the pfm control operation, the pfm duty limit (dty limit_pfm ) is set to 200% (typ.). theref ore, under the condition that the duty increases (e.g. the condition that the step-down ratio is small), it?s possible for p-ch mosfet to be turned off even when coil current doesn?t reach to i pfm . i pfm t on lx i pfm 0ma i pfm i pfm 0ma lx f osc maximum ipfm limit i lx i lx i pfm
13/26 xcl205/xcl206/XCL207 series operational description (continued) c l high speed discharge the xcl205b(c)/ xcl206b(c)/ XCL207b(c) series can quickly discharge the electric charge at the output capacitor (c l ) when a low signal to the ce pin which enables a whole ic circuit put in to off state, is inputted via the n-channel transistor located between the l x pin and the v ss pin. when the ic is disabled, elec tric charge at the output capacitor (c l ) is quickly discharged so that it may avoid applicati on malfunction. discharge time of the output capacitor (c l ) is set by the c l auto-discharge resistance (r) and the output capacitor (c l ). by setting time constant of a c l auto-discharge resistance value [r] and an output capacitor value (c l ) as ( =c x r), discharge time of the output voltage after disc harge via the n channel transistor is calculated by the following formula. v = v out(t) x e ?t/ or t= ln (v out(t) / v) v : output voltage after discharge v out(t) : output voltage t: discharge time, : c x r c= capacitance of output capacitor (c l ) r= c l auto-discharge resistance 0 20 40 60 80 100 0 20406080100 discharge time (ms) output voltage (relative value) 100 = setting voltage value cl=10uf cl=20uf cl=50uf output voltage discharge characteristics r dchg =300 (typ.)
14/26 xcl205/xcl206/XCL207 series operational description (continued) the operation of the xcl205/xcl206/ XCL207 series will enter into the shut down mode when a low level signal is input to the ce/mode pin. during the shutdown mode, t he current consumption of the ic becomes 0 a (typ.), with a state of high impedance at the lx pin and v out pin. the ic starts its operation by inputting a high level signal to the ce/mode pin. the input to the ce/mode pin is a cmos input and the sink current is 0 a (typ.). a b a b intermediate voltage can be generated by rm1 and rm2. please set the value of each r1, r2, rm1, rm2 from few hundreds k to few hundreds m . for switches, cpu open-drain i/o port and transistor can be used. (a) sw ce status on stand-by off operation (b) sw ce status on operation off stand-by (a) sw_ce sw_pwm/pfm ?B on * pwm/pfm automatic switching control off on pwm control off off stand-by (b) sw_ce sw_pwm/pfm ?B on * stand-by off on pwm control off off pwm/pfm automatic switching control ce/mode ce/mode v v v v in in dd dd sw_ce sw_ce r1 r2 < ic inside > < ic inside > < ic inside > < ic inside > ce/mode ce/mode rm1 rm2 rm1 rm2 sw_ce sw_ce sw_pwm/pfm sw_pwm/pfm v dd v dd v in v in xcl205/xcl206 series - exam p les of how to use ce/mode p in XCL207 series - exam p les of how to use ce/mode p in
15/26 xcl205/xcl206/XCL207 series operational description (continued) < soft start > the xcl205/xcl206/XCL207 series (a series and c series) provide 0.9ms (typ). the xcl205b/xcl206b/XCL207b series provide 0.32ms (typ) however, when v out is less than 1.8v, provide 0.25ms (typ.). so ft start time is defined as the time to reach 90% of the output nominal vo ltage when the ce pin is turned on. function chart operational states ce/mode voltage level xcl205 xcl206 XCL207 h level (*1) synchronous pwm fixed control synchronous pwm/pfm automatic switching synchronous pwm/pfm automatic switching m level (*2) synchronous pwm fixed control l level (*2) stand-by stand-by stand-by t ss v ceh 0v 0v v out 90% of setting voltage note on ce/mode pin voltage level range (*1) h level: 0.65v < h level < v in v (for xcl205/xcl206) h level: v in ? 0.25v < h level < v in (for XCL207) (*2) m level: 0.65v < m level < v in - 1.0v (for XCL207) (*3) l level: 0v < l level < 0.25v
16/26 xcl205/xcl206/XCL207 series note on use limit > # ms duty lx i lim ilx 1. the xcl205/xcl206/XCL207 series is designed for use with ceramic output capacitors. if, however, the potential difference is too large between the input voltage and the output voltage, a ceramic ca pacitor may fail to absorb the resulting high switching energy and oscillation could occur on the output. if the input-output potential di fference is large, connect an electrolytic capacitor in parallel to compensate for insufficient capacitance. 2. spike noise and ripple voltage arise in a switching regulator as with a dc/dc converter. these are greatly influenced by external component selection, such as the coil inductance, capacitance values, and board layout of external components. once the design has been completed, verification with actual components should be done. 3. depending on the input-output voltage di fferential, or load current, some pulses may be skipped, and the ripple voltage may increase. 4. when the difference between v in and v out is large in pwm control, very narrow pulses will be outputted, and there is the possibility that some cycles may be skipped completely. 5. when the difference between v in and v out is small, and the load current is heav y, very wide pulses will be outputted and there is the possibility that some cycles may be skipped completely. 6. with the ic, the peak current of the co il is controlled by the current limit circui t. since the peak current increases when dropout voltage or load current is high, current limit starts operation, and this c an lead to instability. when peak current becomes high, please adjust the coil inductance value and fu lly check the circuit operation. in addition, please calculate the peak current according to the following formula: ipk = (v in - v out ) x onduty / (2 x l x f osc ) + i out l: coil inductance value f osc : oscillation frequency 7. when the peak current which ex ceeds limit current flows within the specified time, the built-in p-ch driver transistor turns off. during the time until it detects limit cu rrent and before the built-in transistor can be turned off, the current for limit curr ent flows; therefore, care must be tak en when selecting the rating for the external components such as a coil. 8. when v in is less than 2.4v, limit current may not be reached because voltage falls caused by on resistance. 9. depending on the state of the pc board, latch time may become longer and latch operation may not work. in order to avoid the effect of noise, the board should be laid out so that input capacitors are placed as close to the ic as possible. 10. use of the ic at voltages below the reco mmended voltage range may lead to instability. 11. this ic should be used within the stated absolute ma ximum ratings in order to prevent damage to the device. 12. when the ic is used in high temperatur e, output voltage may increase up to inpu t voltage level at no load because of the leak current of the driver transistor. 13. the current limit is set to 1350ma (max.) at typical. however, the current of 1350m a or more may flow. in case that the current limit functions while the v out pin is shorted to the gnd pin, when p-ch mosfet is on, the potential difference for input voltage will occur at both ends of a coil. for this, the time rate of coil current becomes large. by contrast, when n-ch mosfet is on, there is almost no potentia l difference at both ends of the coil since the v out pin is shorted to the gnd pin. consequently, the time rate of coil current becomes quite small. according to t he repetition of this operation, and the delay time of the circuit, coil current will be converge d on a certain current value, exceeding the amount of current, which is supposed to be limited originally. even in this case , however, after the over current state continues for several ms, the circuit will be latched. a coil should be used with in the stated absolute maximum rating in order to prevent damage to the device. current flows into p- ch mosfet to reach the current limit (i lim ). the current of i lim or more flows since the delay time of the circuit occu rs during from the detection of the current limit to off of p-ch mosfet. because of no potential difference at both ends of the coil, the time rate of coil current becomes quite small. lx oscillates very narrow pulses by the current limit for several ms. the circuit is latched, stopping its operation.
17/26 xcl205/xcl206/XCL207 series note on use (continued) the power loss of micro dc/dc according to the following formula: power loss = v out i out ((100/effi) ? 1) (w) v out output voltage (v) i out output current (a) effi conversion efficiency (%) measurement condition (reference data) condition: mount on a board ambient: natural convection soldering: lead (pb) free board: dimensions 40 x 40 mm (1600 mm 2 in one side) copper (cu) traces occupy 50% of the board area in top and back faces package heat-sink is tied to the copper traces material: glass epoxy (fr-4) thickness: 1.6mm through-hole: 4 x 0.8 diameter 14. in order to stabilize v in voltage level and oscillation frequency, we recommend that a by-pass capacitor (c in ) be connected as close as possible to the v in & v ss pins. 15. high step-down ratio and very light load may lead an intermittent oscillation when pwm mode. 16. please use within the power dissipation range below. pleas e also note that the power dissipation may changed by test conditions, the power dissipation fi gure shown is pcb mounted. 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0 25 50 75 100 operating temperatureta () maximum power disspation pd (w) evaluation board (unit: mm) . 28.9 . 40.0 40.0 28.9 2.54 1.4 2.5
18/26 xcl205/xcl206/XCL207 series note on use (continued) instructions of pattern layouts 1. in order to stabilize v in voltage level, we recommend that a by-pass capacitor (c in ) be connected as close as possible to the v in (no.6) & v ss (no.5) pins. 2. please mount each external component as close to the ic as possible. 3. wire external components as close to the ic as possibl e and use thick, short connecting traces to reduce the circuit impedance. 4. make sure that the pcb gnd traces are as thick as possible, as variations in ground potent ial caused by high ground currents at the time of switching may re sult in instability of the ic. 5. this series? internal driver transistors bring on heat bec ause of the output current and on resistance of driver transistors . 6. please connect lx (no.1) pin and l1 (no.7) pin by wiring on the pcb. 7. please connect v out (no.3) pin and l2 (no.8) pin by wiring on the pcb. cin cl ic lx vin gnd gnd vout ce cin cl ic lx vin gnd gnd vout ce ce lx vin gnd gnd vout back (flip horizontal) front (pcb mounted) front
19/26 xcl205/xcl206/XCL207 series test circuits < circuit no.1 > < circuit no.2 > vin lx vss ce/ mode vout a v cl cin wave form measure point vin lx vss ce/ mode vout a 1f external components cin : 4.7f(ceramic) cl : 10f(ceramic) l1 l2 l2 l1 < circuit no.3 > < circuit no.4 > vin lx vss ce/ mode vout vin lx wave form measure point l1 l1 v 100ma ce/ mode vout rpulldown 200 1f on resistance = (vin-vlx)/100ma vss < circuit no.5 > vin lx vss ce/ mode vout a ileakh ileakl a iceh icel < circuit no.7 > vin lx vss ce/ mode vout rpulldown 1 ilat wave form measure point vin lx vss ce/ mode vout v ilim wave form measure point 1f 1f 1f 1f ilx vin lx vss ce/ mode vout 1uf a < circuit no.9 > vin lx vss ce/ mode vout a cin l2 l2 l2 l2 l2 l2 l2 l1 l1 l1 l1 l1 < circuit no.10 > vin lx vss ce/ mode vout a v cl l cin wave form measure point l1 l2 external components l : 1.5uh(xe?) cin : 4.7f(ceramic) cl : 10f(ceramic)
20/26 xcl205/xcl206/XCL207 series typical performance characteristics (1) efficiency vs. output current (2) output voltage vs. output current 0 20 40 60 80 100 0.1 1 10 100 1000 output current:i out (ma) efficency:effi(% ) ( pwm ) 2.4v 3.6v vin= 4.2v xcl206/XCL207(pwm/pfm) xcl205/XCL207 1.5 1.6 1.7 1.8 1.9 2.0 2.1 0.1 1 10 100 1000 output current:i out (ma) output voltage:v out (v) vi n 4.2v,3.6v,2.4v xcl205/XCL207 ( pwm/ pfm ) ( pwm ) xcl/206/XCL207 (3) ripple voltage vs. output current (4) oscillation frequency vs. ambient temperature 0 20 40 60 80 100 0.1 1 10 100 1000 output current:i out (ma) ripple voltage:vr(mv) 3.6v vi n 4.2v,3.6v,2.4v xcl205/XCL207 xcl206/XCL207 (pwm) (pwm/pfm) vi n 4.2v 2.4v 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 -50 -25 0 25 50 75 100 ambient temperature: ta ( ) vin=3.6v oscillation fr equency : fosc(mhz) (5) supply current vs. ambient temperature (6) output voltage vs. ambient temperature 0 5 10 15 20 25 30 35 40 -50 -25 0 25 50 75 100 ambient temperature: ta ( ) supply current : i dd ( a) vin=6.0v 4.0v 2.0v 1.5 1.6 1.7 1.8 1.9 2.0 2.1 -50 -25 0 25 50 75 100 ambient temperature: ta ( ) output voltage : v out (v) vin=3.6v xcl205a183ar/xcl206a183ar/XCL207a183ar xcl205a183ar/xcl206a183ar/XCL207a183ar xcl205a183ar/xcl206a183ar/XCL207a183ar xcl205a183ar/xcl206a183ar/XCL207a183ar xcl205a183ar/xcl206a183ar/XCL207a183ar xcl205a183ar/xcl206a183ar/XCL207a183ar
21/26 xcl205/xcl206/XCL207 series typical performance characteristics (continued) (7) uvlo voltage vs. ambient temperature (8) ce "h" voltage vs. ambient temperature 0.0 0.3 0.6 0.9 1.2 1.5 1.8 -50 -25 0 25 50 75 100 ambient temperature: ta ( ) uvlo voltage : uvlo (v) ce=v in 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -50 -25 0 25 50 75 100 ambient temperature: ta ( ) ce "h" voltage : vceh (v ) vin=5.0v 3.6v 2.4v (9) ce "l" voltage vs. ambient temperature (10) soft start time vs. ambient temperature 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -50 -25 0 25 50 75 100 ambient temperature: ta ( ) ce "l" voltage : v cel (v) vin=5.0v 3.6v 2.4v 0.0 1.0 2.0 3.0 4.0 5.0 -50 -25 0 25 50 75 100 ambient temperature: ta ( ) soft start time : tss (ms) vin=3.6v (11) "pch / nch" driver on resistance vs. input voltage (12) rise wave form 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0123456 input voltage : vin (v) pch on resistance nch on resistance lx sw on resistance:rlxh,rlxl ( ? ) ce:0.0v?1.0v xcl206b333 vin=5.0v iout=1.0ma time:100 s/div vout 1ch 2ch 1ch:1v/div 2ch:1v/div xcl205b333ar/xcl206b333ar/XCL207b333ar xcl205a183ar/xcl206a183ar/XCL207a183ar xcl205a183ar/xcl206a183ar/XCL207a183ar xcl205a183ar/xcl206a183ar/XCL207a183ar xcl205a183ar/xcl206a183ar/XCL207a183ar xcl205a183ar/xcl206a183ar/XCL207a183ar time: 100 s /div
22/26 xcl205/xcl206/XCL207 series typical performance characteristics (continued) (13) soft-start time vs. ambient temperature (14) cl discharge resistance vs. ambient temperature 0 100 200 300 400 500 -50 -25 0 25 50 75 100 ambient temperature: ta ( ) vin=5.0v iout=1.0ma soft start time : tss ( s) 100 200 300 400 500 600 -50 -25 0 25 50 75 100 ambient temperature: ta ( ) vin=6.0v 4.0v 2.0v XCL207b333 (15) load transient response mode pwm/pfm automatic switching control iout=1ma ? 100ma 1ch:100ma/div 2ch:50mv/div 1ch vout 2ch time:100 s/div vin=3.6v,vout=1.8v iout=1ma ? 300ma vout 1ch:100ma/div 2ch:50mv/div time:100 s/div 1ch 2ch vin=3.6v,vout=1.8v iout=100ma ? 1ma vout 1ch:100ma/div 2ch:50mv/div time:100 s/div 2ch 1ch vin=3.6v,vout=1.8v iout=300ma ? 1ma vout 1ch:100ma/div 2ch:50mv/div time:100 s/div 1ch 2ch vin=3.6v,vout=1.8v xcl205b333ar/xcl206b333ar/XCL207b333ar xcl205b333ar/xcl206b333ar/XCL207b333ar time: 100 s /div time: 100 s /div time: 100 s /div time: 100 s /div xcl206a183ar/XCL207a183ar xcl206a183ar/XCL207a183ar xcl206a183ar/XCL207a183ar xcl206a183ar/XCL207a183ar cl discharge resistance: ( )
23/26 xcl205/xcl206/XCL207 series typical performance characteristics (continued) (15) load transient response (continued) mode pwm control 1ch:100ma/div 2ch:50mv/div time:100 s/div 2ch 1ch iout=1ma ? 100ma vin=3.6v,vout=1.8v 1ch:100ma/div 2ch:50mv/div time:100 s/div 2ch 1ch iout=1ma ? 300ma vin=3.6v,vout=1.8v time:100 s/div 1ch:100ma/div 2ch:50mv/div 2ch 1ch iout=100ma ? 1ma vin=3.6v,vout=1.8v time:100 s/div 1ch:100ma/div 2ch:50mv/div 2ch 1ch iout=300ma ? 1ma vin=3.6v,vout=1.8v time: 100 s /div time: 100 s /div time: 100 s /div time: 100 s /div xcl205a183ar/XCL207a183ar xcl205a183ar/XCL207a183ar xcl205a183ar/XCL207a183ar xcl205a183ar/XCL207a183ar
24/26 xcl205/xcl206/XCL207 series packaging information external lead reference pattern layout reference metal mask design xcl205/xcl206/XCL207
25/26 xcl205/xcl206/XCL207 series marking rule represents products series represents type of dc/dc converters represents the decimal part of output voltage , represents production lot number 01 09 0a 0z 11 9z a1 a9 aa z9 za zz in order. (g, i, j, o, q, w excluded) note: no character inversion used. mark product series 4 xcl205a*****-g c xcl205b*****-g k xcl205c*****-g 5 xcl206a*****-g d xcl206b*****-g l xcl206c*****-g 6 XCL207a*****-g e XCL207b*****-g m XCL207c*****-g mark output voltage (v) ocsillation frequency=3.0mhz (xcl20****3**-g) 0.x f 1.x h 2.x k 3.x l 4.x m output voltage (v) mark product series x.0 0 xcl20***0***-g x.05 a xcl20***a***-g x.1 1 xcl20***1***-g x.15 b xcl20***b***-g x.2 2 xcl20***2***-g x.25 c xcl20***c***-g x.3 3 xcl20***3***-g x.35 d xcl20***d***-g x.4 4 xcl20***4***-g x.45 e xcl20***e***-g x.5 5 xcl20***5***-g x.55 f xcl20***f***-g x.6 6 xcl20***6***-g x.65 h xcl20***h***-g x.7 7 xcl20***7***-g x.75 k xcl20***k***-g x.8 8 xcl20***8***-g x.85 l xcl20***l***-g x.9 9 xcl20***9***-g x.95 m xcl20***m***-g xcl205/xcl206/XCL207 1 2 3 6 5 4
26/26 xcl205/xcl206/XCL207 series 1. the products and product specifications cont ained herein are subject to change without notice to improve performance characteristic s. consult us, or our representatives before use, to confirm that the informat ion in this datasheet is up to date. 2. we assume no responsibility for any infri ngement of patents, pat ent rights, or other rights arising from the use of any information and circuitry in this datasheet. 3. please ensure suitable shipping controls (including fail-safe designs and aging protection) are in force for equipment employing products listed in this datasheet. 4. the products in this datasheet are not devel oped, designed, or approved for use with such equipment whose failure of malfuncti on can be reasonably expected to directly endanger the life of, or cause significant injury to, the user. (e.g. atomic energy; aerospace; transpor t; combustion and associated safety equipment thereof.) 5. please use the products listed in this datasheet within the specified ranges. should you wish to use the products under conditions exceeding the specifications, please consult us or our representatives. 6. we assume no responsibility for damage or loss due to abnormal use. 7. all rights reserved. no part of this dat asheet may be copied or reproduced without the prior permission of torex semiconductor ltd.

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