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fp6161 1.5mhz, 1a synchronous step-down regulator this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 1/16 fp6161 gnd sw fb / v out v in run v out v in general description the fp6161 is a high efficiency current m ode synchronous buck pwm dc-dc regulator. the internal generated 0.6v precision feedback reference voltage is designed for low output voltage. low r ds (on) synchronous switch dramatically reduces condu ction loss. to extend battery life for portable application, 100% duty cycle is supported for low- dropout operation. shutdown mode also helps saving the current consumption. the fp 6161 is packaged in dfn-6l, sot23-5l, and tsot23-5l to reduce pcb space. features ? input voltage range: 2.5 to 5.5v ? precision feedback reference voltage: 0.6v (2%) ? output current: 1a (max.) ? duty cycle: 0~100% ? internal fixed pwm frequency: 1.5mhz ? low quiescent current: 100 a ? no schottky diode required ? built-in soft start ? current mode operation ? over temperature protection ? package: dfn-6l (2x2mm), sot23-5l, tsot23-5l applications ? cellular telephone ? wireless and dsl modems ? digital still cameras ? portable products ? mp3 players typical application circuit
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 2/16 function block diagram switching control logic current sense current limit slope compensation osc uvlo shutdown control otp reference voltage generator fbuv com- - + parator error amp. - + run pre-driver and anti shoot- through sr latch q s q r - + pwm com- parator reverse gnd fb/ v out fb/ v out 0.6v 0.3v sw v cc reverse current detector pin descriptions dfn-6l zya 986 sot23-5l / tsot23-5l zy986 name no. i / o description nc 1 no connect run 2 i enable pin v in 3 p power supply sw 4 o switch gnd 5 p ground fb / v out 6 i feedback ep 7 p exposed pad ? must connect to ground name no. i / o description run 1 i enable gnd 2 p ground sw 3 o switch v in 4 p power supply fb / v out 5 i feedback
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 3/16 marking information dfn-6l sot23-5l / tsot23-5l halogen free : halogen free product indicator lot numbe r : wafer lot number?s last two digits for example: 132386tb ? 86 internal id : internal identification code y ea r : production year?s last digit
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 4/16 ordering information part number code operating temperature package moq description fp6161dr-lf-adj zy -40 c ~ +85 c dfn-6l (2x2mm) 2500ea tape & reel fp6161kr-lf-adj zy -40 c ~ +85 c sot23-5l 3000ea tape & reel FP6161IR-LF-ADJ zy -40 c ~ +85 c tsot23-5l 3000ea tape & reel absolute maximum ratings parameter symbol conditions min. typ. max. unit input supply voltage v in -0.3 6 v run, v fb , sw pin voltage -0.3 v in v p-channel switch source current (dc) 1.5 a n-channel switch source current (dc) 1.5 a peak sw switch sink and source current (ac) 2 a dfn-6l +165 c / w sot23-5l +250 c / w thermal resistance (junction to ambient) ja tsot23-5l +250 c / w dfn-6l +20 c / w sot23-5l +90 c / w thermal resistance (junction to case) jc tsot23-5l +90 c / w junction temperature +150 c storage temperature -65 +150 c lead temperature (soldering, 10 sec) +260 c suggested ir re-flow soldering curve
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 5/16 recommended operating conditions parameter symbol conditions min. typ. max. unit supply voltage v in 2.5 5.5 v operating temperature -40 +85 c dc electrical characteristics (t a = 25 c , v in =3.6v, unless otherwise noted) parameter symbol conditions min. typ. max. unit t a =25 c 0.588 0.6 0.612 v regulated feedback voltage v fb -40 c ~+85 c 0.582 0.6 0.618 v line regulation with v ref ? v fb v in =2.5v to 5.5v 0.04 0.4 ? / v output voltage line regulation ? v out v in =2.5 to 5.5v 0.04 0.4 % / v rds (on) of p-channel fet r ds(on) pi sw =100ma 0.28 0.35 rds (on) of n-channel fet r ds (on) ni sw =-100ma 0.25 0.32 sw leakage i lsw v run =0v, v in =5v 0.01 1 a peak inductor current i pk v fb =0.5v 1.125 1.5 1.875 a shutdown, v run =0v 0.1 1 a quiescent current i cc active, v fb =0.5v, v run =v in 100 a run threshold v run 0.3 1 1.5 v run leakage current i run 0.01 1 a oscillator frequency f osc v fb =0.6v 1.2 1.5 1.8 mhz
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 6/16 typical operating characteristics (t a = 25 c , v in =3.6v, unless otherwise noted) supply current vs. v in 65 70 75 80 85 90 95 100 23456 v in (v) supply current (a ) 85 25 -45 v fb =0.5v supply current vs. v in 0 2 4 6 8 10 12 14 16 18 23456 v in (v) supply current (na) 85 25 -45 shutdown reference voltage vs. temperature 0.595 0.596 0.597 0.598 0.599 0.6 0.601 0.602 0.603 0.604 0.605 -60-50-40-30-20-10 0 102030405060708090 temperature ( ) reference voltage (v) v in =3.6v frequency vs. temerature 1.4 1.42 1.44 1.46 1.48 1.5 1.52 1.54 1.56 1.58 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 temperature ( ) frequency (mhz ) t a =25 supply current vs. v in 18 19 20 21 22 23 24 23456 v in (v) supply current (a ) 85 25 -45 v fb =0.7v line regulation 0.585 0.59 0.595 0.6 0.605 0.61 23456 v in (v) reference voltage (v) t a =25 frequency vs. v in 1.44 1.46 1.48 1.5 1.52 1.54 1.56 23456 v in (v) frequency (mhz ) v i n =3.6v switch leakage vs. input volatge 0 0.2 0.4 0.6 0.8 1 1.2 1234567 v in (v) switch leakage (na) synchronous switch main switch t a =25
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 7/16 function description control loop the fp6161 is a high efficiency current mode synchronous buck regulator. both the main (p-channel mosfet) and synchronous (n-channel mosfet) switches are built internally. with current mode operation, the pwm duty is controlle d both by the error amplifier output and the peak inductor current. at the beginning of each cycle, the oscillator turn on the p-mosfet switch to source current from v in to sw output. then, the chip starts to compare the inductor current with the error amplifier output. once the inductor current is larger than the error amplifier output, the p-mosfet switch is turned off. when the load cu rrent increases, the feedback voltage fb will slightly drop. this causes the error amplifier to output a higher cu rrent level until the prior mentioned peak inductor current reach the same level. t he output voltage then can be sustained at the same. when the top p-mosfet switch is off, the botto m synchronous n-mosfet switch is turned on. once the inductor current reverses, both top and bo ttom mosfet will be turn off to leave the sw pin into high impedance state. the fp6161?s current mode control loop also includes slope compensation to suppress sub-harmonic oscillations at high duty cycles. this slope compens ation is achieved by adding a compensation ramp to the inductor current signal. ldo mode the fp6161?s maximum duty cycle can reach 100%. that means the driver?s main switch is turn on through out whole clock cycle. once the duty reaches 100%, the feedback path no longer controls the output voltage. the output voltage will be the input voltage minus the main switch voltage drop. over current protection fp6161 limits the peak main switch current cycle by cycle. when over current occurs, chip will turn off the main switch and turn the synchronous switch on until next cycle. short circuit protection when the fb pin drops below 300mv, the chip will tri-state the output pin sw automatically. after 300us rest to avoid over heating, chip will re-initiate pwm operation with soft start. thermal protection fp6161 will shutdown automatically when the in ternal junction temperature reaches 150 to protect both the part and the system.
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 8/16 application information input capacitor selection the input capacitor must be connected to the v in pin and gnd pin of fp6161 to maintain steady input voltage and filter out the pulsing input current . the voltage rating of input capacitor must be greater than maximum input voltage plus ripple voltage. in switch mode, the input curr ent is discontinuous in a buck converter. the source current waveform of the high-side mosfet is a square wave. to prevent large voltage transients, a low esr input capacitor sized for the maximum rms current must be used. the rms value of input capacitor current can be calculated by: ? ? ? ? ? ? ? ? ? ? ? in o in o o rms v v 1 v v i i max it can be seen that when v o is half of v in , c in is under the worst current stress. the worst current stress on c in is i o_max / 2. inductor selection the value of the inductor is selected based on the desired ripple current. large inductance gives low inductor ripple current and small inductance result in high ripple current. however, the larger value inductor has a larger physical size, higher series resistance, and / or lower saturation current. in experience, the value is to allow the peak-to-pea k ripple current in the inductor to be 10%~20% maximum load current. the inductance value can be calculated by: ?? in o o o in in o l o in v v i %) 20 ~ % 10 ( 2 f ) v v ( v v i f ) v v ( l ? ? ? ? ? ? ? ? the inductor ripple current can be calculated by: ? ? ? ? ? ? ? ? ? ? ? ? ? in o o l v v 1 l f v i choose an inductor that does not saturate un der the worst-case load conditions, which is the load current plus half the peak-to-peak induct or ripple current, even at the highest operating temperature. the peak inductor current is: 2 i i i l o peak _ l ? ? ?
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 9/16 the inductors in different shape and style are available from manufacturers. shielded inductors are small and radiate less emi issue. but they cost more than unshielded inductors. the choice depends on emi requirement, price and size . inductor value ( h) dimensions component supplier model 2.2 4.23.71.2 fe ng-jui tp4212-2r2m 2.2 4.45.81.2 sumida cmd4d11 2r2 3.3 4.23.71.2 fe ng-jui tp4212-3r3m 4.7 4.23.71.2 fe ng-jui tp4212-4r7m 4.7 4.45.81.2 sumida cmd4d11 4r7 4.7 4.94.91.0 sumida clsd09 4r7 output capacitor selection the output capacitor is required to maintain the dc output voltage. low esr capacitors are preferred to keep the output voltage ripple low. in a buck converter circuit, output ripple voltage is determined by inductor value, switching frequency, output capacitor value and esr. the output ripple is determined by: ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? out cout l o c f 8 1 esr i v where f = operating frequency, c out = output capacitance and i l = ripple current in the inductor. for a fixed output voltage, t he output ripple is highest at maximum input voltage since i l increases with input voltage. capacitor value ( f) case size component supplier model 4.7 0603 tdk c1608jb0j475m 10 0805 taiyo yuden jmk212bj106mg 10 0805 tdk c12012x5roj106k 22 0805 1206 tdk c2012jb0j226m using ceramic input and output capacitors care must be taken when ceramic capacitors are used at the input and the output. when a ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a load step at the output can indu ce ringing at the input, v in . at best, this ringing can couple to the output and be mistaken as loop instability. at worst, a su dden inrush current through the long wires can potentially cause a voltage spike at v in , which may large enough to damage the part. when choosing the input and output ceramic capacitors, choose the x5r or x7r specifications. their dielectrics have the best temperature and voltage c haracteristics of all the cera mics for a given value and size.
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 10/16 output voltage programming in the adjustable version, the output voltage is set using a resistive voltage divider from the output voltage to fb. the output voltage is: ? ? ? ? ? ? ? ? ? ? 2 1 o r r 1 v 6 . 0 v the recommended resistor value is summarized below: v out (v) r 1 () r 2 () c 3 (f) 0.6 200k not used not used 1.2 200k 200k 10p 1.5 300k 200k 10p 1.8 200k 100k 10p 2.5 270k 85k 10p 3.3 306k 68k 10p pc board layout checklist 1. the power traces, consisting of the gnd, sw and v in trace should be kept short, direct and wide. 2. place c in near v in pin as closely as possible to mainta in input voltage steady and filter out the pulsing input current. 3. the resistive divider r 1 and r 2 must be connected to fb pin dire ctly and as closely as possible. 4. fb is a sensitive node. pleas e keep it away from switching node, sw. a good approach is to route the feedback trace on another pcb layer and have a ground plane between the top and feedback trace routing layer. this reduces em i radiation on to the dc-dc converter its own voltage feedback trace. 5. keep the gnd plates of c in and c out as close as possible. then connect this to the ground plane (if one is used) with several vias. this reduces ground plane noise by preventing the switching currents from circulating through t he ground plane. it also reduces ground bounce at fp6161 by giving it a low impedance ground connection.
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 11/16 suggested layout for sot23-5l suggested layout for dfn-6l
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 12/16 typical application fp6161 gnd sw fb / v out v in run 3 2 5 4 v in 2.5v~5.5v sot23-5l / tsot23-5l r1 270k r2 85k c2 10f l1 3.3uh c3 10pf c1 10f 1 v out 2.5v / 1a
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 13/16 i load : 100ma~1a ch1:v out ch2: i sw en on waveform (v out : 1.8v) ch1: en ch2: sw ch3: v out ch4: i sw efficiency (v in : 5.3v) efficiency vs output current 0 10 20 30 40 50 60 70 80 90 100 0.1 1.0 10.0 100.0 1000.0 output current (ma) efficiency (%) vout=3.3v vout=1.8v vout=1.2v i load : 200ma~1a ch1: v out ch2: i sw efficiency (v out : 2.5v) efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 0.1 1.0 10.0 100.0 1000.0 output current (ma) efficiency (%) vin=2.7v vin=3.6v vin=4.2v
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 14/16 package outline dfn-6l unit: mm symbols min. (mm) max. (mm) a 0.700 0.800 a1 0.000 0.050 b 0.200 0.300 c 0.190 0.250 d 1.950 2.050 d2 1.350 1.450 e 1.950 2.050 e2 0.750 0.850 e 0.650 ref l 0.300 0.400 y 0.000 0.075
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 15/16 sot23-5l unit: mm note: 1. package dimensions are in compliance with jedec outline: mo-178 aa. 2. dimension ?d? does not include moldi ng flash, protrusions or gate burrs. 3. dimension ?e1? does not include inter-lead flash or protrusions. symbols min. (mm) max.(mm) a 1.050 1.350 a1 0.050 0.150 a2 1.000 1.200 b 0.250 0.500 c 0.080 0.200 d 2.700 3.000 e 2.600 3.000 e1 1.500 1.700 e 0.950 bsc e1 1.900 bsc l 0.300 0.550 l1 0.600 ref l2 0.250 bsc 0 10 1 3 7 2 6 10
fp6161 this datasheet contains new product informat ion. feeling technology reserves the ri ghts to modify the product specification wi thout notice. no liability is assumed as a result of t he use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.65 16/16 tsot23-5l unit: mm note: 1. dimension ?d? does not include moldi ng flash, protrusions or gate burrs. 2. dimension ?e1? does not include inter-lead flash or protrusions. symbols min.(mm) max.(mm) a 0.750 0.800 a1 0.000 0.050 a2 0.700 0.775 b 0.350 0.500 c 0.100 0.200 d 2.800 3.000 e 2.600 3.000 e1 1.500 1.700 e 0.950 bsc e1 1.900 bsc l 0.370 0.600 l1 0.600 ref l2 0.250 bsc r 0.100 r1 0.100 0.250 0 8 1 4 12

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