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www.fairchildsemi.com rev. 1.0.4 4/4/05 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 features ? 85% peak ef?iency ?ow emi ? ow ripple output voltage 1.3v/1.8v input voltage range: 2.2v to 5.5v output current: up to 250ma ?.5% output voltage accuracy ?0 a operating current ? 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 portable electronic equipment core supply to next generation processors ? ow v oltage dc bus digital cameras dsp supplies description the fan5601 is an advanced third generation switched capacitor step down dc/dc converter utilizing fairchilds proprietary scalarpump technology. this innovative archi- tecture utilizes scalar switch re-con?uration and fractional switching techniques 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 avail- able in 100mv increments from 1v to 1.8v. contact market- ing for customized 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 ov er temperature conditions. the fan5601 is available in 6-lead 3x3mm mlp. scalarpump is a registered trademark of fairchild semiconductor corporation. f an5601 regulated step-down charge pump dc/dc converter t ypical application
product specification fan5601 2 rev. 1.0.4 4/4/05 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 no connection 5v out no connection 6v in ground enable c+ c- gnd v in v out 6-lead 3x3mm mlp f an5601 t op-view 1 2 3 6 5 4
fan5601 product specification rev. 1.0.4 4/4/05 3 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 ? junction 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
product specification fan5601 4 rev. 1.0.4 4/4/05 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 coefficient 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 efficiency v in = 2.35 v out i out =150ma 85 % v in at configuration 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 turn on time v in = 3.6v, i out = 0ma, 10% to 90% 1ms
fan5601 product specification rev. 1.0.4 4/4/05 5 t ypical performance characteristics t a = 25?, c in = c out =10 f, c b = 1 f, 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
product specification fan5601 6 rev. 1.0.4 4/4/05 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. 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
fan5601 product specification rev. 1.0.4 4/4/05 7 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 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
product specification fan5601 8 rev. 1.0.4 4/4/05 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
fan5601 product specification rev. 1.0.4 4/4/05 9 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
product specification fan5601 10 rev. 1.0.4 4/4/05 detailed description the fan5601 switched capacitor dc/dc converter auto- matically con?ures switches to achieve a high ef?iency and provides 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 switch is split into three segments. based on the values of v in , v out and i out , an internal cir- cuitry 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 detec- tor comparator. two phase non-overlapping clock signals are generated to drive four 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, switches 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?uration changes from 2:1 to 1:1 at v in = 3.56v. at 1.3v output setting 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 switches 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 completely. this is pulse-skipping mode. since the supply is isolated from the output, the output volt- age will drop. once the output is dropped to about 1.58v(lower limit), the device will return to regular switch- ing 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 block diagram 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
fan5601 product specification rev. 1.0.4 4/4/05 11 charge cycle. full switch operation occurs only during star- tup or under heavy load condition, when half switch opera- tion cannot achieve regulation within seven charge cycles. soft start the soft-start feature limits inrush current when the device is initially powered up and enabled. the reference voltage is used to control the rate of the output voltage ramp-up to its ?al value. typical start-up time is 1ms. since the rate of the output voltage ramp-up is controlled by an internally gener- ated slow ramp, pulse-skipping occurs and inrush current is automatically limited. shutdown, uvlo, short circuit current limit and thermal shutdown the device has an active-low shutdown pin to decrease sup- ply current to less than 1 a. in shutdown mode the supply is disconnected from the output. uvlo triggers when supply v oltage 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 current is limited. thermal shutdown triggers at 150?. switch con?uration 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 1. (a) figure 1. (b)
product specification fan5601 12 rev. 1.0.4 4/4/05 applications information proper operation of the fan5601 requires one ceramic b ucket 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 perfor- mance, use of low esr (<0.05 ? ) ceramic input and output bypass capacitors is recommended. the x5r and x7r rated capacitors provide adequate performance over the -40? to 85? temperature range. the value of the bucket capacitor is dependent on load cur- rent requirements. a 1? bucket capacitor will work well in all applications at all load currents, while a 0.1? capacitor will support most applications under 100ma of load current. the choice of bucket capacitor values should be veri?d in the actual application at the lowest input voltage and highest load current. a 30% margin of safety is recommended in order to account for the tolerance of the bucket capacitor and the variations in the on-resistance of the internal switches. 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 interference has to be kept as low as possible, the user may consider the use of additional input and output ?tering. for e xample, adding an l-c ?ter to the standard output bypass con?uration is very effective in reducing both the output ripple and the voltage spikes. figure 2 shows an l-c ?ter using a 100nh chip inductor and a 1? capacitor. the chan- nel 1 of figure 3 shows the ripple voltage at the output of the device while channel 2 shows the ripple voltage at the out- put of the ?ter at v in = 3.3v, v out = 1.3v and i out = 100ma. similar ?tering method will greatly reduce the current spikes at the input. the user should be mindful of considering resistive voltage drops in the inductors connected serially in the input and output leads. figure 3. 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 k eep 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. 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) figure 2. optional l-c filter 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
fan5601 product specification rev. 1.0.4 4/4/05 13 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
product specification fan5601 life support policy fairchild? products are not authorized for use as critical components in life support devices or systems without the express written approval of the president 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, and (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 a significant injury of the user. 2. a critical component in 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. www.fairchildsemi.com 4/4/05 0.0m 004 stock#ds30005236 ? 2004 fairchild semiconductor corporation 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. 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

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