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?005 fairchild semiconductor corporation 1 www.fairchildsemi.com j uly 2005 f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter output 1.0v t o 1.8v c b = 1 f input 2.2v to 5.5v c in = 10 f c out = 10 f gnd v out c+ c- enable v in fan5601 f an5601 regulated step-down charge pump dc/dc converter features > 85% peak ef?iency low emi low ripple output voltage 1.3v/1.8v input voltage range: 2.2v to 5.5v output current: up to 250ma ?.5% output voltage accuracy 30 a operating current i cc < 1 a in shutdown mode 2mhz operating frequency shutdown isolates output from input soft-start limits inrush current short circuit and over temperature protection minimum external component count 6-lead 3x3mm mlp package applications cell phones handheld computers po r table electronic equipment core supply to next generation processors low voltage dc bus digital cameras dsp supplies description the fan5601 is an advanced third generation switched capaci- tor step down dc/dc converter utilizing fairchilds proprietary scalarpump technology. this innovative architecture utilizes scalar switch re-con?uration and fractional switching tech- niques to produce low output ripple, low esr spikes and improve ef?iency over a wide load range. the fan5601 produces a ?ed regulated output from 2.2v to 5v input voltage. customized output voltages are available in 100mv increments from 1v to 1.8v. contact marketing for cus- tomized outputs. in order to maximize ef?iency, the fan5601 achieves regulation by skipping pulses. depending upon load current, the size of the switches is scaled dynamically, consequently, current spikes and emi are minimized. an internal soft start circuitry prevents excessive current drawn from the supply. the device is internally protected against short circuit and over temperature conditions. the fan5601 is available in 6-lead 3x3mm mlp. scalarpump is a registered trademark of fairchild semiconductor corporation. t ypical application
2 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter pin assignment pin description pin no. pin name pin function description 6-lead 3x3mm mlp 1c + bucket capacitor positive connection 2c - bucket capacitor negative connection 3 enable enable pin 4 gnd ground 5v out regulated output voltage. bypass this pin with 10? ceramic low esr capacitor. 6v in supply voltage input enable c+ c- gnd v in v out 6-lead 3x3mm mlp f an5601 t op-view 1 2 3 6 5 4
3 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter absolute maximum ratings (note1) recommended operating conditions notes: 1. operation beyond the absolute maximum rating may cause permanent damage to device. 2. using mil std. 883e, method 3015.7(human body model) and eia/jesd22c101-a (charge device model). 3. one square inch, 1oz bottom side gnd plane connected to top side gnd plane by field of via. p arameter min max unit v in ,v out , enable to gnd -0.3 6.0 v c+, c-, to gnd -0.3 v in + 0.3 v v out short circuit duration indefinite lead soldering temperature (10 seconds) 300 ? operating temperature range -40 +85 ? j unction temperature 150 ? storage temperature -55 150 ? electrostatic discharge (esd) protection (note2) hbm 4 kv cdm 1 p arameter package min typ max unit input voltage 2.2 5.5 v output current 250 ma operating ambient temperature -40 85 ? thermal resistance junction to tab 6-lead 3x3mm mlp 8 ?/w thermal resistance junction to ambient 6-lead 3x3mm mlp (note 3) 90 ?/w
4 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter electrical characteristics v in = 2.2v to 5.5v, i out = 1ma, c b = 1?, c in = 10?, c out = 10?, t a = -40? to +85?, typical values measured at t a = 25?, unless otherwise noted. notes: 4. no load supply current is measured when the oscillator is off. 5. the short circuit protection is designed to protect against pre-existing short circuit conditions, i.e. assembly shorts that exist prior to device power-up. the short circuit current limit is 25ma average . short circuit currents in normal operation are inherently limited by the on-resistance of internal device. since this resistance is in the range of 1 ? , in some cases thermal shutdown may occur. however, immediately following the first thermal shutdown event, the short circuit condition will be treated as pre-existing, and the load current will reduce to 25ma average . p arameter conditions min. typ. max. units input undervoltage lockout 1.9 2.0 2.17 v output voltage vnom v output voltage accuracy t a = 25?, v in = 3.3v -2 +2 % v in = 3.3v -2.5 +2.5 % output voltage temperature coef?ient v in = 3.3v 25 ppm load regulation 0.133 mv/ma line regulation t a = 25? 1.35 2 mv/v no load supply current (note 4) i out = 0ma, v in = 2.2v 30 60 a shutdown supply current enable =gnd. v out = 0 0.1 1 a output short-circuit current (note 5) v out = gnd. 25 ma ef?iency v in = 2.35 v out i out =150ma 85 % v in at con?uration change from 2:1 to 1:1 mode 2.22 x vnom v oscillator frequency 2.0 mhz thermal shutdown threshold 150 c thermal shutdown threshold hysteresis 15 c enable logic input high voltage, v ih v in = 2.2v to 5.5v 1.3 v enable logic input low voltage, v il v in = 2.2v to 5.5v 0.4 v enable logic input current enable = v in or gnd -1 1 a v out tu rn on time v in = 3.6v, i out = 0ma, 10% to 90% 1ms
5 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter t ypical performance characteristics t a = 25?, c in = c out =10?, c b = 1?, v out = 1.3v, unless otherwise noted. 0204 06080100120140160 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 input voltage (1v/div) ou tput voltage (50mv/div) time (10 s/div) v in = 2 v to 4.4v i out = 10ma 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 28 30 32 34 36 38 40 42 44 46 input voltage (v) i out = 0ma 2.5 3.0 3. 54.04.55.05.5 10 20 30 40 50 60 70 input current vs input voltage shutdown current vs input voltage input voltage (v) shutdown current (na) v out = 0v v in = 4.4v v in = 2v -60 -40 -20 0 20 40 60 80 100 120 140 1.26 1.27 1.28 1.29 1.30 1.31 output voltage vs ambient temperature ambient temperature ( c) output voltage (v) i out = 10ma v in = 4v input current ( a) mode change threshold and hysteresis vs load current threshold and hysteresis (v) h ysteresis low threshold high threshold load current (ma) line transient response load transient response output voltage (20mv/div) load current (100ma/div) time (1ms/div) v in = 3.3v i out = 1ma i out = 10 0ma
6 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter t ypical performance characteristics (cont.) t a = 25?, c in = c out =10?, c b = 1?, v out = 1.3v, unless otherwise noted. 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0.7 0.8 0.9 1.0 1.1 1.2 1.3 v in (v) v en able (v) i out = 10ma t a = 25 c time (400 s/div) enable voltage (5v/div) output voltage (500m v/div) enable threshold vs input voltage enable delay i out = 10ma v in = 2.2v output ripple (10mv/div) output ripple (2mv/div) output ripple (10mv/div) output ripple (10mv/div) i out = 1.3 a v in = 2.2v v out = 1.3v output ripple output ripple output ripple output ripple time (40ms/div) time (40ms/div) time (20ms/div) time (20ms/div) i out = 1.3 a v in = 2.7v v out = 1.3v i out = 1.3 a v in = 3.6v v out = 1.3v i out = 1.3 a v in = 4.2v v out = 1. 3v
7 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter t ypical performance characteristics (cont.) t a = 25?, c in = c out =10?, c b = 1?, v out = 1.3v, unless otherwise noted. output ripple output ripple output ripple output ripple output ripple output ripple ti me (20ms/div) output ripple (10mv/div) i out = 1.3 a v in = 5.5v v out = 1.3v time (100 s/div) output ripple (10mv/div) i out = 10ma v in = 2.2v v out = 1.3v time (100 s/div) output ripple (10mv/div) i out = 10ma v in = 3.6v v out = 1.3v time (100 s/div) outp ut ripple (10mv/div) i out = 10ma v in = 5.5v v out = 1.3v time (100 s/div) output ripple (10mv/div) i out = 10ma v in = 2.7v v out = 1.3v time (100 s/div) output ripple (10mv/div) i out = 10ma v in = 4.2v v out = 1.3v
8 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter t ypical performance characteristics (cont.) t a = 25?, c in = c out =10 f, c b = 1 f, v out = 1.3v, unless otherwise noted. output ripple output ripple output ripple output ripple output ripple time (10 s/div) i out = 15 0ma v in = 2.2v v out = 1.3v time (10 s/div) i out = 150ma v in = 2.7v v out = 1.3v time (10 s/div) i out = 15 0ma v in = 3.6v v out = 1.3v time (1 s/div) i out = 150ma v in = 4.2v v out = 1.3v time (1 s/div) output ripple (20mv/div) output ripple (20mv/div) output ripple (20mv/div) output ripple (20mv/div) output ripple (20mv/div) i out = 1 50ma v in = 5.5v v out = 1.3v
9 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter t ypical performance characteristics (cont.) t a = 25?, c in = c out =10 f, c b = 1 f, v out = 1.3v, unless otherwise noted. 0 10 20 30 40 50 60 70 80 90 100 load current = 1ma load current = 10ma load current = 50ma load current = 100ma load current = 150ma load current = 250ma 050 100 150 200 250 300 78 80 82 84 86 88 123 456 ouput voltage (v) ouput voltage (v) 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 load current = 1ma load current = 10ma load current = 50ma lo ad current = 100ma lo ad current = 150ma lo ad current = 250ma 050 100 150 200 250 300 1.20 1.22 1.24 1.26 1.28 1.30 1.32 t a = -40 c t a = 0 c t a = 80 c t a = 125 c input voltage (v) 123 456 input voltage (v) output voltage vs input voltage efficiency vs input voltage output voltage vs load current peak efficiency vs load current efficiency (%) peak efficiency (%) load current (ma) load current (ma) v in = 4.5v v in = 2. 95v t a = 25 c v out = 1.3v t a = 25 c
10 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter block diagram detailed description the fan5601 switched capacitor dc/dc converter automati- cally con?ures switches to achieve a high ef?iency and pro- vides a regulated output voltage by means of pulse skipping, pulse frequency modulation (pfm). an internal soft start circuit prevents excessive inrush current drawn from the supply. each s witch is split into three segments. based on the values of v in , v out and i out , an internal circuitry determines the number of segments to be used to reduce current spikes. step-down charge pump operation when v in 2.22 v out , a 2:1 con?uration shown in fig.1(a) is enabled. the factor 0.9 is used instead of 1 in order to account for the effect of resistive losses across the switches and to accommodate hysteresis in the voltage detector comparator. tw o phase non-overlapping clock signals are generated to drive f our switches. when switches 1 and 3 are on, switches 2 and 4 are off and c b is charged. when switches 2 and 4 are on, s witches 1 and 3 are off, charge is transferred from c b to c out . when v in <2.22 v out , a 1:1 con?uration shown in fig. 1(b) is enabled. in the 1:1 con?uration switch 3 is always off and the switch 4 is always on. at 1.6v output setting the con?ura- tion changes from 2:1 to 1:1 at v in = 3.56v. at 1.3v output set- ting the change occurs at v in = 3.06v. pulse-skipping pfm and fractional switch operation when the regulated output voltage reaches its upper limit, the s witches are turned off the output voltage reaches its lower limit. considering a step-down 2:1 mode of operation, 1.6v output as an example, when the output reaches about 1.62v(upper limit), the control logic turns off all switches. switching stops com- pletely. this is pulse-skipping mode. since the supply is isolated from the output, the output voltage will drop. once the output is dropped to about 1.58v(lower limit), the device will return to reg- ular switching mode with one quarter of each switch turning on ?st. another quarter of each switch will be turned on if v out cannot reach regulation by the time of arrival of the third charge cycle. full switch operation occurs only during startup or under heavy load condition, when half switch operation cannot achieve regulation within seven charge cycles. soft start the soft-start feature limits inrush current when the device is ini- tially powered up and enabled. the reference voltage is used to control the rate of the output voltage ramp-up to its ?al value. t ypical start-up time is 1ms. since the rate of the output voltage r amp-up is controlled by an internally generated slow ramp, pulse-skipping occurs and inrush current is automatically lim- ited. uvlo + - shutdown control logic configuration pulse_skip short_ckt. + - + - + - thermal shutdown in out v ref ramp fb output 150mv 1v 0.5* input voltage ref. soft start v ref ramp oscillator (2mhz) c+ c- enable v in gnd. d r i v e r s 0.25sw1 0.25sw1 0.25sw4 0.25sw4 0.5sw4 0.25sw3 0.25sw3 0.5sw3 0.5sw2 0.25sw2 0.25sw2 0.5sw1 fb v ou t
11 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter shutdown, uvlo, short circuit current limit and thermal shutdown the device has an active-low shutdown pin to decrease supply current to less than 1 a. in shutdown mode the supply is dis- connected from the output. uvlo triggers when supply voltage drops below 2v. when the output voltage is lower than 150mv, a short circuit protection is triggered. in this mode 15 out of 16 pulses during the switching will be skipped and the supply cur- rent is limited. thermal shutdown triggers at 150?. switch con?uration applications information proper operation of the fan5601 requires one ceramic bucket capacitor in the 0.1? to 1? range; one 10? output bypass capacitor and one 10? input bypass capacitor. in order to obtain optimum output ripple and noise performance, use of low esr (<0.05 ? ) ceramic input and output bypass capacitors is recommended. the x5r and x7r rated capacitors provide ade- quate performance over the -40? to 85? temperature range. the value of the bucket capacitor is dependent on load current requirements. a 1? bucket capacitor will work well in all appli- cations at all load currents, while a 0.1? capacitor will support most applications under 100ma of load current. the choice of bu ck et capacitor values should be veri?d in the actual applica- tion at the lowest input voltage and highest load current. a 30% margin of safety is recommended in order to account for the tol- erance of the bucket capacitor and the variations in the on-resis- tance of the internal switches. s1 s2 s3 s4 v in gnd c+ v out c- c out 2:1 configuration switches in charging phase reverse all switches for pumping phase c b s1 s3 s4 v in gnd c+ v out c- c out 1:1 configuration switch 3 is always off and switch 4 is always on switches 1 and 2 are in phase 1 reverse the position of switches 1&2 f or phase 2 c b s2 figure 2. (a) figure 2. (b)
12 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter one of the key bene?s of the scalarpump architecture is that the dynamically scaled on-resistance of the switches effectively reduces the peak current in the bucket capacitor and therefore input and output ripple current is also reduced. nevertheless, due to the esr of the input and output bypass capacitors, these current spikes generate voltage spikes at the input and output pins. however, these esr spikes can be easily ?tered because their frequency lie at up to 12 times the clock frequency. in applications where conductive and radiated emi/rfi interfer- ence has to be kept as low as possible, the user may consider the use of additional input and output ?tering. for example, adding an l-c ?ter to the standard output bypass con?uration is very effective in reducing both the output ripple and the volt- age spikes. figure 2 shows an l-c ?ter using a 100nh chip inductor and a 1? capacitor. the channel 1 of figure 3 shows the ripple voltage at the output of the device while channel 2 shows the ripple voltage at the output of the ?ter at v in = 3.3v, figure 1. optional l-c filter v out = 1.3v and i out = 100ma. similar ?tering method will g reatly reduce the current spikes at the input. the user should be mindful of considering resistive voltage drops in the induc- tors connected serially in the input and output leads. figure 2. effect of l-c filter on output ripple while evaluating the fan5601 (or any other switched capacitor dc-dc converter) the user should be careful to keep the power supply source impedance low; use of long wires causing high lead inductances and resistive losses should be avoided. a carefully laid out ground plane is essential because current spikes are generated as the bucket capacitor is charged and discharged. the input and output bypass capacitors should be placed as close to the device pins as possible. input 2.2v to 5.5v c b = 1 f v in v out enable fan5601 gnd c out = 10 f c+ c c f = 1 f l f = 100nh output 1.0v to 1.8v c in = 10 f time (10 s/div) output ripple (10mv/div) i out = 100ma v in = 3.3v v out = 1.3v ripple at c f (10mv/div)
13 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter mechanical dimensions 6-lead 3x3mm mlp package b. dimensions are in millimeters. c. dimensions and tolerances per asme y14.5m, 1994 notes: a. conforms to jedec registration mo-229, variation weea, dated 11/2001 0.10 c a b 0.05 c top view bottom view recommended land pattern 0.15 c 0.08 c 3.0 3.0 0.05 0.00 2.25 1.65 1.90 0.15 c 2x 2x 0.45 0.20 0.8 max side view seating plane 0.10 c pin #1 ident 1 3 4 6 0.2 min 2.10 1.65 2.45 0.65 typ 0.95 typ 3.50 (0.70) 0.30~0.45 (0.20) 0.95
14 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter ordering information product number package type voltage option [vnom] order code f an5601 6-lead 3x3mm mlp 1.3v fan5601mp13x 6-lead 3x3mm mlp 1.8v fan5601mp18x
15 www.fairchildsemi.com f an5601 rev. 1.0.5 f an5601 regulated step-down charge pump dc/dc converter disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. trademarks the following are registered and unregistered trademarks fairchild semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. life support policy f airchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms datasheet identification product status definition advance information preliminary no identification needed obsolete this datasheet contains the design specifications for product development. specifications may change in any manner without notice. this datasheet contains preliminary data, and supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. this datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. this datasheet contains specifications on a product that has been discontinued by fairchild semiconductor. the datasheet is printed for reference information only. formative or in design first production full production not in production isoplanar? littlefet? microcoupler? microfet? micropak? microwire? msx? msxpro? ocx? ocxpro? optologic ? optoplanar? p acman? pop? power247? poweredge? f ast ? f astr? fps? frfet? globaloptoisolator? gto? hisec? i 2 c? i-lo ? implieddisconnect? intellimax? rev. i16 acex? activearray? bottomless? build it now? coolfet? crossvolt ? dome? ecospark? e 2 cmos? ensigna? f act? f act quiet series? powersaver? powertrench ? qfet ? qs? qt optoelectronics? quiet series? rapidconfigure? rapidconnect? serdes? silent switcher ? smart start? spm? s tealth? superfet? supersot?-3 supersot?-6 supersot?-8 syncfet? tinylogic ? tinyopto? trutranslation? uhc? ultrafet ? unifet? vcx? wire? across the board. around the world.? the power franchise ? programmable active droop?

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