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FP6160B 1.5mhz, 600ma synchronous step-down regulator this datasheet contains new product information. feeling technol ogy reserves the rights to modi fy 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. 0.62 1/14 general description the FP6160B is a high efficiency current mode synchronous buck pwm dc-dc regulator. the internal generated 0.6v precision feedback refe rence voltage is designed for low output voltage. low r ds (on) synchronous switch dramatical ly reduces conduction 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 FP6160B is pack aged in 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: 0.6a (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: sot23-5l, tsot23-5l applications ? cellular phones ? wireless and dsl modems ? digital still cameras ? portable products ? mp3 players typical application circuit
FP6160B 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. 0.62 2/14 1 2 3 5 4 run gnd sw v in top view fb / v out function block diagram pin descriptions sot23-5l / tsot23-5l 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
FP6160B 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. 0.62 3/14 marking information sot23-5l / tsot23-5l ai986 lot number part number code year lot numbe r : wafer lot number?s last two digits for example: 132386tb ? 86 y ea r : production year?s last digit art number code : part number identification code for this product. it should be always ?ai?
FP6160B 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. 0.62 4/14 ordering information part number code operating temperature package moq description FP6160Bkr-lf-adj ai -40c ~ +85c sot23-5l 3000ea tape & reel FP6160Bir-lf-adj ai -40c ~ +85c 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 voltage -0.3 v in v p-channel switch source current (dc) 0.78 a n-channel switch source current (dc) 0.78 a peak sw switch sink and source current (ac) 1.56 a sot23-5l +250 c / w thermal resistance (junction to ambient) ja tsot23-5l +250 c / w sot23-5l +90 c / w thermal resistance (junction to case) jc tsot23-5l +90 c / w operating temperature -40 +85 c junction temperature +150 c storage temperature -65 +150 c sot23-5l 250 mw allowable power dissipation p d tsot23-5l 250 mw lead temperature (soldering, 10 sec) +260 c ir re-flow soldering curve
FP6160B 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. 0.62 5/14 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 FP6160B-1.5, i out =100ma 1.455 1.5 1.545 v regulated output voltage v out FP6160B-1.8, i out =100ma 1.746 1.8 1.854 v output voltage lineregulation ? v out v in =2.5 to 5.5v 0.04 0.4 % / v r ds (on) of p-channel fet r ds (on) p i sw =100ma 0.4 r ds (on) of n-channel fet r ds (on) n i sw =-100ma 0.35 sw leakage i lsw v run =0v, v in =5v 0.01 1 a peak inductor current i pk v fb =0.5v 1 1.2 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
FP6160B 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. 0.62 6/14 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 ) v in =3.6v 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 ) t a =25 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
FP6160B this datasheet contains new product informat ion. feeling technology reserves the right s 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. 0.62 7/14 function description control loop the FP6160B is a high efficiency current mode synchronous buck regulator. both the main (p-channel mosfet) and synchronous (n-channel mo sfet) switches are built internally. with current mode operation, the pwm duty is controll ed 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 curren t is larger than the error amplifier output, the p-mosfet switch is turned off. when the load current increases, the feedback voltage fb will slightly drop. this causes the error amplifier to output a higher current 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 bottom mosfet will be turn off to leave the sw pin into high impedance state. the FP6160B?s current mode control loop also contains slope compensation to suppress sub-harmonic oscillations at high duty cycles. this slope compensation is achieved by adding a compensation ramp to the inductor current signal. ldo mode the FP6160B?s maximum duty cycle can reach 100%. that means the driver 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 FP6160B limits the peak main switch current cycl e by cycle. when over current happens, chip will turn off the main switch and turn t he synchronous switch on until next cycle. short circuit protection when the fb pin drops below 300m v, the chip will tri-state the out put pin sw automatically. after 300us rest to avoid over heating, chip will re-initiate pwm operation with soft start. thermal protection FP6160B will shutdown automatically when the internal junction temperature reaches 150 c to protect both the part and the system.
FP6160B this datasheet contains new product informat ion. feeling technology reserves the right s 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. 0.62 8/14 application information input capacitor selection the input capacitor must be connected to the v in pin and gnd pin of the FP6160B to maintain steady input voltage and filter out the pulsing input cu rrent. the voltage rating of input capacitor must be greater than maximum input voltage plus ripple voltage. in switch mode, the input current is discontinuous in a buck converter. the source current of the high-side mosfet is a square wave. to prevent large voltage transient s, 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 ) max ( o rms v v 1 v v i i 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 u nder 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 ? ? ?
FP6160B this datasheet contains new product informat ion. feeling technology reserves the right s 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. 0.62 9/14 the inductors in different shape and style are av ailable from manufacturers. shielded inductors are small and radiate less emi issue. but they co st more than unshielded inductors. the choice depends on emi requirement, price and size. 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 il = ripple current in the inductor. for a fixed output voltage, t he output ripple is highest at maximum input voltage since il 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 i nduce ringing at the input, v in . at best, this ringing can couple to the output and be mistaken as loop instability. at worst, a sudden inrush of current through the long wires can potentially cause a voltage spike at v in , large enough to damage the part. when choosing the input and output ceramic capacitors, choose the x5r or x7 r dielectric formulations. these dielectrics have inductor value (h ) dimensions (mm) 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
FP6160B this datasheet contains new product informat ion. feeling technology reserves the right s 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. 0.62 10/14 the best temperature and voltage c haracteristics of all the cera mics for a given value and size. 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 ( ) 0.6 200k not used 1.2 200k 200k 1.5 300k 200k 1.8 200k 100k 2.5 270k 85k 3.3 306k 68k pc board layout checklist 1. the power traces, consisting of t he gnd trace, the sw trace and the v in trace should be kept short, direct and wide. 2. place c in near v in pin as closely as possible. to maintain 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 as closely as possible. 4. fb is a sensitive node. please keep it away from switching node, sw. a good approach is to route the feedback trace on another layer and to have a ground plane between the top layer and the layer on which the feedback trace is rout ed. this reduces emi radiation on to the dc-dc converter?s 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 visa. this reduces ground plane noise by preventing he switching currents from circulating through the ground plane. it also reduces ground bounce at the FP6160B by giving it a low impedance ground connection.
FP6160B this datasheet contains new product informat ion. feeling technology reserves the right s 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. 0.62 11/14 suggested layout 1 2 3 5 ground plane FP6160B 4 c1 v out via to v in via to v out gnd v in c2 c3 r1 r2
FP6160B this datasheet contains new product informat ion. feeling technology reserves the right s 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. 0.62 12/14 typical application i load : 60ma~600ma i load : 200ma~600ma ch1:v out ch2: i sw ch1: v out ch2: i sw en on waveform (v out : 2.5v) efficiency (v out : 2.5v) 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 vcc=2.7v vcc=3.6v vcc=4.2v ch1: en ch2: sw ch3: v out ch4: i sw
FP6160B this datasheet contains new product informat ion. feeling technology reserves the right s 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. 0.62 13/14 package outline sot23-5l unit: mm note: 1. package dimensions are in complia nce with jedec outline: mo-178 aa. 2. dimension ?d? does not include mold ing 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
FP6160B this datasheet contains new product informat ion. feeling technology reserves the right s 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. 0.62 14/14 tsot23-5l unit: mm note: 1. dimension ?d? does not include mold ing 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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