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si9145 vishay siliconix document number: 70021 s-40710?rev. k, 19-apr-04 www.vishay.com 1 low-voltage switchmode controller features 2.7-v to 7-v input operating range voltage-mode pwm control high-speed, source-sink output drive (200 ma) internal oscillator (up to 2 mhz) standby mode 0 ? 100% controllable maximum duty-cycle description the si9145 switchmode controller ic is ideally suited for high efficiency dc/dc converters in low input voltage systems. operation is guaranteed down to 2.7 v, with a minimum start-up voltage of 3.0 v making the si9145 ideal for use with nicd, nmh, and lithium ion battery packs. a mode select pin allows the output driver polarity to be programmed allowing the device to function as a step-up or step-down converter. features include a precision bandgap reference, a wide bandwidth error amplifier, a 2-mhz oscillator, an input voltage monitor with standby mode and a 200-ma output driver. supply current in normal operation is typically 1.1 ma and 250 a in standby mode. the si9145 implements conventional voltage mode control. the maximum duty cycle in boost mode can be limited by voltage on d max /ss pin. frequency can be externally programmed by selection of r osc and c osc . the si9145 is available in both standard and lead (pb)-free 16-pin soic and tssop packages and is specified over the industrial temperature range ( ? 25 c to 85 c). functional block diagram ? + uvlo set d max /ss comp c osc fb ni v s output p gnd gnd v uvlo oscillator ots temp sense v ref 1.5-v reference generator r osc enable mode select v dd uvlo error amp s r logic control ? + ? + driver pentium is a trademark of intel corporation. powerpc is a trademark of ibm.
si9145 vishay siliconix www.vishay.com 2 document number: 70021 s-40710?rev. k, 19-apr-04 absolute maximum ratings voltages referenced to gnd. v dd , v s 8 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p gnd 0.3 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v dd to v s ? 0.3 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . linear inputs ? 0.3 v to v dd to +0.3 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . logic inputs ? 0.3 v to v dd to +0.3 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous output current 100 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature ? 65 to 125 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating junction temperature 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . power dissipation (package) a 16-pin soic (y suffix) b 900 mw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-pin tssop (q suffix) c 925 mw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . thermal impedance ( ja ) 16-pin soic 140 c/w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-pin tssop 135 c/w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . notes a. device mounted with all leads soldered or welded to pc board. b. derate 7.2 mw/ c above 25 c. c. derate 7.4 mw/ c above 25 c. recommended operating range voltages referenced to gnd. v dd 2.7 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v s 2.7 v to 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . f osc 2 khz to 2 mhz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . r osc 5 k to 250 k . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . c osc 47 pf to 200 pf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . linear inputs 0 to v dd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . digital inputs 0 to v dd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v ref load resistance >150 k . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . specifications test conditions unless otherwise specified a limits b suffix ? 25 to 85 c parameter symbol 2.7 v v dd 7 v, v dd = v s gnd = p gnd min b typ max b unit reference output voltage v ref i ref = ? 10 a 1.455 1.545 v output voltage v ref t a = 25 c 1.477 1.50 1.523 v oscillator maximum frequency c f max v cc = 3.0 v, c osc = 47 pf, r osc = 5.0 k 2.0 accuracy f osc v cc = 3.0 v c osc = 100 pf, r osc = 6.98 k t a = 25 c 0.85 1.0 1.15 mhz r osc voltage v rosc 1.0 minimum start-up voltage v ddosc 3.0 v 50% d max /ss v dmax 50% mode select = v dd 1.30 v 100% d max /ss v dmax 100% mode select = v dd 1.58 d max /ss input current i dmax d max = 0 to v dd ? 100 100 na 2.7 v v dd 7 v, ref to 4.8 v ? 16 16 voltage stability c f/f 2.7 v v dd 4.2 v, ref to 3.5 v t a = 25 c ? 8 8 % gy f/f 3.8 v v dd 5.6 v, ref to 4.7 v a ? 7 7 % temperature stability c referenced to 25 c 5
si9145 vishay siliconix document number: 70021 s-40710?rev. k, 19-apr-04 www.vishay.com 3 specifications limits b suffix ? 25 to 85 c test conditions unless otherwise specified a 2.7 v v dd 7 v, v dd = v s gnd = p gnd parameter unit max b typ min b test conditions unless otherwise specified a 2.7 v v dd 7 v, v dd = v s gnd = p gnd symbol error amplifier (c osc = gnd, osc disabled) input bias current i fb v ni = v ref , v fb = 1.0 v ? 1.0 1.0 a open loop voltage gain a vol 47 55 db offset voltage v os v ni = v ref ? 15 0 15 mv unity gain bandwidth c bw 10 mhz output current i ea source (v fb = 1 v, ni = v ref ) ? 2.0 ? 1.0 ma output current i ea sink (v fb = 2 v, ni = v ref ) 0.4 0.8 ma power supply rejection c p srr 2.7 v < v dd < 7.0 v 60 db uvlo set voltage monitor under voltage lockout v uvlohl uvlo set high to low 0.85 1.0 1.15 v under voltage lockout v uvlolh uvlo set low to high 1.2 v hysterisis v hys v uvlolh ? v uvlohl 200 mv uvlo input current i uvlo v uvlo = 0 to v dd ? 100 100 na output output high voltage v oh v dd = 2.7 v, i out = ? 10 ma 2.55 2.60 v output low voltage v ol v dd = 2.7 v, i out = 10 ma 0.06 0.15 v peak output current i source v dd = 2.7 v, v out = 0 v ? 180 ? 130 ma peak output current i sink v dd = 2.7 v, v out = 2.7 v 150 200 ma logic enable delay to output td en enable rising to output 1.5 s enable logic low v enl 0.2 v dd v enable logic high v enh 0.8 v dd v enable input current i en enable = 0 to v dd ? 1.0 1.0 a mode select logic low v model 0.2 v dd v mode select logic high v modeh 0.8 v dd v mode select input current i mode mode select = 0 to v dd ? 1.0 1.0 a over temperature sense trip point t trip 150 c output low voltage v otsl v dd = 2.7 v, i out = 1 a 0.06 0.15 v output high voltage v otsh v dd = 2.7 v, i out = ? 1 a 2.55 2.6 v supply supply current normal mode v dd = 2.7 v, f osc = 1 mhz, r osc = 6.98 k 1.1 1.5 ma supply current ? normal mode i dd v dd = 7 v, f osc = 1 mhz, r osc = 6.98 k 1.6 2.3 ma supply current ? standby mode dd enable = low 250 330 a notes a. c stray < 5 pf on c osc . after start-up, v dd of 3 v. b. the algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data s heet. c. guaranteed by design, not subject to production testing.
si9145 vishay siliconix www.vishay.com 4 document number: 70021 s-40710?rev. k, 19-apr-04 typical characteristics (25 c unless noted) phase (deg) gain (db) 1.485 1.490 1.495 1.500 1.505 1.510 1.515 2345678 0 5 10 15 20 25 234567 0 5 10 15 20 25 0.5 1.0 1.5 2.0 1.485 1.490 1.495 1.500 1.505 1.510 1.515 0 5 10 15 20 25 30 1.485 1.490 1.495 1.500 1.505 1.510 1.515 ? 25 0 25 50 75 100 125 2.7, 3.0, 3.6 v v ref vs. supply v oltage v ref vs. t emperature supply current vs.supply voltage and output load supply current vs. switching frequency and output load v ref vs. load current v dd ? supply voltage (v) (v) ref v (v) ref v v ref ? sourcing current ( a) (v) ref v supply current (ma) supply current (ma) v dd ? supply voltage (v) switching frequency (mhz) v ref with 10 a load t ? temperature ( c) 5.0 v 7.0 v c l = 2,200 pf 900 pf 100 pf 10 pf f = 1 mhz c l = 2,200 pf 900 pf 100 pf 10 pf v dd = 3.6 v v dd = 3.6 v error amplifier gain and phase f ? frequency (mhz) 80 0 ? 30 ? 60 ? 90 ? 120 ? 150 60 40 20 0 ? 20 ? 40 0.0001 0.001 0.01 0.1 1 10 100 gain phase
si9145 vishay siliconix document number: 70021 s-40710?rev. k, 19-apr-04 www.vishay.com 5 typical characteristics (25 c unless noted) 0.01 0.10 1.00 10.00 1 2 3 4 5 0.0 0.2 0.4 0.6 0.8 1.0 0.90 0.95 1.00 1.05 1.10 1.15 1.20 234567 220 230 240 250 260 270 234567 0 20 40 60 80 100 1.0 1.1 1.2 1.3 1.4 1.5 1.6 0.9 1.1 1.3 1.5 1.7 1.9 2.5 3.5 4.5 5.5 6.5 7.5 t a = 85 c 25 c supply current vs. frequency and supply v oltage supply current vs. supply voltage and t emperature switching frequency vs. supply v oltage standby current vs. supply voltage and t emperature duty cycle vs. d max /ss voltage f ? frequency (mhz) supply current (ma) normal current (ma) v dd ? supply voltage (v) a) standby current ( v dd ? supply voltage (v) duty cycle (%) d max /ss (v) switching frequency (mhz) v dd ? supply voltage (v) c l = 10 pf c l = 10 pf f = 1 mhz ? 25 c t a = 85 c 25 c ? 25 c 2.7 v 3.0 v 3.6 v 5.0 v v dd = 7.0 v r osc = 6.98 k c osc = 100 pf frequency vs. r osc /c osc c osc ? capacitance (pf) switching frequency (mhz) 4.99 k 12.1 k 24.9 k 49.9 k 100 k 249 k 40 300 100 200
si9145 vishay siliconix www.vishay.com 6 document number: 70021 s-40710?rev. k, 19-apr-04 typical characteristics (25 c unless noted) 1.485 1.490 1.495 1.500 1.505 1.510 1.515 0246810 0 10 20 30 40 50 234567 10 20 30 40 50 234567 150 170 190 210 230 250 234567 0 10 20 30 40 50 234567 output rise time vs. supply voltage and load output fall time vs. supply voltage and load enable delay to output uvlo hysteresis vs. supply voltage output rise time (ns) v dd ? supply voltage (v) v dd ? supply voltage (v) fall time (ns) output delay (ns) v dd ? supply voltage (v) v dd ? supply voltage (v) uvlo hysteresis (mv) c l = 2,200 pf 900 pf 100 pf 10 pf 900 pf 100 pf 10 pf mode select = high mode select = low c l = 2,200 pf v dd = 3.6 v v ref vs. bypass capacitor (v) ref v capacitance (mf)
si9145 vishay siliconix document number: 70021 s-40710?rev. k, 19-apr-04 www.vishay.com 7 timing waveforms enable mode select uvlo set r osc c osc output d max /ss 1.2 v 1.0 v on off >1.5 v set for 50% max. 1.0 v start-up (uvlo) normal (duty cycle limit) standby enable mode select uvlo set r osc c osc output d max /ss 1.2 v 1.0 v off on start-up (uvlo) normal (duty cycle limit) standby figure 1. si9145 timing diagram (mode select = high) figure 2 . si9145 timing diagram (mode select = low) 1.0 v
si9145 vishay siliconix www.vishay.com 8 document number: 70021 s-40710?rev. k, 19-apr-04 pin configurations 13 v dd v s mode select output d max /ss p gnd comp uvlo set fb ni v ref enable ots c osc gnd r osc soic-16 14 15 16 2 3 4 1 10 11 12 5 6 7 9 8 top view 13 v dd v s mode select output d max /ss p gnd comp uvlo set fb ni v ref enable ots c osc gnd r osc tssop-16 14 15 16 2 3 4 1 10 11 12 5 6 7 9 8 top view ordering information?soic-16 part number temperature range SI9145BY-T1 25 to 85 c SI9145BY-T1?e3 ? 25 to 85 c ordering information?tssop-16 part number temperature range si9145bq-t1 25 to 85 c si9145bq-t1?e3 ? 25 to 85 c pin description pin 1: v dd the positive power supply for all functional blocks except output driver. a bypass capacitor of 0.1 f (minimum) is recommended. pin 2: mode select this pin is used to enable maximum duty cycle limit and set output polarity of controller. when connected to v dd , the maximum duty cycle function is controlled by the d max /ss pin. the maximum duty cycle limit is usually used for forward, flyback, and boost converters. the output polarity is high when the pwm circuitry requires the external device to be turned on. when connected to gnd, the maximum duty cycle is not limited (usually for buck converters driving a p-channel mos). the output polarity is low when the pwm circuitry requires the external pmos to be turned on. pin 3: d max /ss d max /ss pin controls the maximum duty cycle achievable by the pwm circuitry when the mode select = v dd . when d max /ss is at less than 1.0 v (typical) the output is held low (0% duty cycle). when d max /ss is at more than 1.5 v (typical), the pwm circuitry can achieve 100% duty cycle. with voltage at d max /ss between 1.0 v and 1.5 v, the maximum duty cycle is proportionally limited to this voltage. the addition of external components can implement a soft start function. pin 4: comp this pin is the output of the error amplifier. a compensation network is connected from this pin to the fb pin to stabilize the system. this pin drives one input of the internal pulse width modulation comparator. pin 5: fb the inverting input of the error amplifier. external resistors are connected to this pin to set the regulated output voltage. the compensation network is also connected to this pin. pin 6: ni the non-inverting input of the error amplifier. in normal operation it is externally connected to the v ref pin. pin 7: v ref this pin supplies 1.5 v trimmed to 1.5%. the reference voltage is generated by a band-gap reference. pin 8: gnd negative return for v dd .
si9145 vishay siliconix document number: 70021 s-40710?rev. k, 19-apr-04 www.vishay.com 9 pin 9: r osc this pin is the equivalent of a 1.0-v voltage source derived from the on-chip v ref . when a low t.c. resistor is externally connected from this pin to gnd, a temperature independent current is generated internally. this current is used as the charging current source connected to the c osc pin. the current is internally multiplied by 2 and is used as the discharging current source connected to the c osc pin. therefore, the external resistor is one of the factors that determine the oscillator frequency. pin 10: c osc an external capacitor is connected to this pin to set the oscillator frequency. internal current sources alternately charge and discharge the external capacitor. the oscillator waveform is a symmetrical triangular type with a typical voltage swing between 1.0 v and 1.5 v. f osc 0.7 r osc c osc pin 11: ots this pin indicates an over-temperature condition on the device when the output is low. the output is latched low and is reset with the enable pin going low then high, or by turning power off and on. pin 12: enable a logic high on this pin allows normal operation. a logic low places the chip in the standby mode. in standby mode normal operation is disabled, supply current is reduced, the oscillator stops and the output is held high for mode select = low, and low for mode select = high. pin 13: uvlo set this pin will place the chip in the standby mode if the uvlo set voltage drops below 1.2 v. once the uvlo set voltage exceeds 1.2 v, the chip operates normally. there is a built-in hysteresis of 200 mv. pin 14: p gnd the negative return for the v s supply. pin 15: output this cmos push-pull output pin drives the external mosfet and is capable of sinking 150 ma or sourcing 130 ma with v s equal to 2.7 v. pin 16: v s the positive terminal of the power supply which powers the cmos output driver. a bypass capacitor is required.
si9145 vishay siliconix www.vishay.com 10 document number: 70021 s-40710?rev. k, 19-apr-04 applications si9145 2.7 v ? 7 v v dd c1 q1 c2 l1 d1 v out 0 v figure 3. non-isolated step up boost converter for v out > v in si9145 2.7 v ? 7 v c1 q1 c2 l1 d1 0 v figure 4. non-isolated step down buck converter for v out < v in v dd v out si9145 2.7 v ? 7 v c1 q1 c2 l1 figure 5. non-isolated synchronous buck converter for v out < v in q2 0 v v dd v out
legal disclaimer notice vishay document number: 91000 www.vishay.com revision: 08-apr-05 1 notice specifications of the products displayed herein are subjec t to change without notice. vishay intertechnology, inc., or anyone on its behalf, assume s no responsibility or liability fo r any errors or inaccuracies. information contained herein is intended to provide a product description only. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in vishay's terms and conditions of sale for such products, vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and /or use of vishay products including liab ility or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyrigh t, or other intellectual property right. the products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify vishay for any damages resulting from such improper use or sale.
all leads 0.101 mm 0.004 in e h c d e b a1 l 4 3 12 8 7 56 13 14 16 15 9 10 12 11 package information vishay siliconix document number: 72807 28-jan-04 www.vishay.com 1 soic (narrow): 16-lead (power ic only) jedec part number: ms-012 millimeters inches dim min max min max a 1.35 1.75 0.053 0.069 a 1 0.10 0.20 0.004 0.008 b 0.38 0.51 0.015 0.020 c 0.18 0.23 0.007 0.009 d 9.80 10.00 0.385 0.393 e 3.80 4.00 0.149 0.157 e 1.27 bsc 0.050 bsc h 5.80 6.20 0.228 0.244 l 0.50 0.93 0.020 0.037 0 8 0 8 ecn: s-40080?rev. a, 02-feb-04 dwg: 5912
vishay siliconix package information document number: 74417 23-oct-06 www.vishay.com 1 symbols dimensions in millimeters min nom max a - 1.10 1.20 a1 0.05 0.10 0.15 a2 - 1.00 1.05 b 0.22 0.28 0.38 c - 0.127 - d 4.90 5.00 5.10 e 6.10 6.40 6.70 e1 4.30 4.40 4.50 e-0.65- l 0.50 0.60 0.70 l1 0.90 1.00 1.10 y--0.10 1036 ecn: s-61920-rev. d, 23-oct-06 dwg: 5624 tssop: 16-lead
pad pattern www.vishay.com vishay siliconix revision: 02-sep-11 1 document number: 63550 this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 recommended minimum pad for tssop-16 0.281 (7.15) recommended minimum pads dimensions in inches (mm) 0.171 (4.35) 0.055 (1.40) 0.012 (0.30) 0.026 (0.65) 0.014 (0.35) 0.193 (4.90)
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