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fp6166 dual 1.5mhz, 1a 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. 0.65 1/19 general description the fp6166 is a high efficiency current mode dual synchronous buck pwm dc-dc regulator. the internal generated 0.6v precision feedback re ference voltage is designed for low output voltage. low r ds (on) synchronous switch dramatically reduces conduction loss. to extend battery life for portable application, 100% duty cycle is supported fo r low-dropout operation. shutdown mode also helps saving the current consumption. the fp6166 is packaged in msop-10l (ep) and dfn-10l (ep) to reduce pcb space. features ? input voltage range: 2.5 to 5.5v ? adjustable output voltage from 0.6v to v in ? precision feedback reference voltage: 0.6v (2%) ? output current: 1a (max.) each channel ? duty cycle: 0~100% ? internal fixed pwm frequency: 1.5mhz ? low quiescent current: 190 a ? no schottky diode required ? built-in soft start ? current mode operation ? over temperature protection ? package: msop-10l (ep), dfn-10l (ep) applications ? cellular telephone ? wireless and dsl modems ? digital still cameras ? portable products ? mp3 players
fp6166 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. 0.65 2/19 typical application circuit function block diagram
fp6166 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. 0.65 3/19 6166ad 9fa86l 6166ad 9fa86l pin descriptions msop-10l (ep) dfn-10l(ep) name no. i / o description fb1 1 i first channel feedback run1 2 i first channel enable v in 3 p ic power supply sw1 4 o first channel switch output gnd 5 p ground mode / sync 6 i mode selection, oscillator synchronization sw2 7 o second channel switch output pg 8 o power good run2 9 i second channel enable fb2 10 i second channel feedback ep 11 p exposed pad ? connect to ground name no. i / o description fb1 1 i first channel feedback run1 2 i first channel enable v in 3 p ic power supply sw1 4 o first channel switch output gnd 5 p ground mode / sync 6 i mode selection, oscillator synchronization sw2 7 o second channel switch output pg 8 o power good run2 9 i second channel enable fb2 10 i second channel feedback ep 11 p exposed pad ? connect to ground
fp6166 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. 0.65 4/19 marking information msop-10l(ep) halogen free lot number internal id per-half month year 6166ad reference voltage code ext: ad 0.6v dfn-10l(ep) 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 per-half month : production period indicated in half month time unit for example: january a (front half month), b (last half month) february c (front half month), d (last half month) y ea r : production year?s last digit
fp6166 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. 0.65 5/19 ordering information part number operating temperature package moq description fp6166adgr-g1 -40c ~ +85c msop-10l (ep) 3000ea tape & reel FP6166ADDR-G1 -40c ~ +85c dfn-10l (ep) 2500ea 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) 1 a n-channel switch source current (dc) 1 a peak sw switch sink and source current (ac) 2 a msop-10l +70 c / w thermal resistance (junction to ambient) ja dfn-10l +65 c / w msop-10l +10 c / w thermal resistance (junction to case) jc dfn-10l +10 c / w operating temperature -40 +85 c junction temperature +150 c storage temperature -65 +150 c msop-10l +260 c lead temperature (soldering, 10 sec) dfn-10l +260 c
fp6166 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. 0.65 6/19 ir re-flow soldering curve
fp6166 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. 0.65 7/19 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 (v in =3.6v, t a = 25 c, 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 lineregulation ? v out v in =2.5 to 5.5v 0.04 0.4 % / v rds (on) of p-channel fet r ds (on) p i sw =100ma 0.28 0.35 rds (on ) of n-channel fet r ds (on) n i 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 input voltage range v in 2.5 5.5 v shutdown, v run =0v 0.1 1 a active, v fb =0.5v, v run =v in 190 a quiescent current i cc pfm, v fb =0.7v, v run =v in 150 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
fp6166 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. 0.65 8/19 typical operating characteristics (v in =3.6v,t a = 25 c , unless otherwise noted) supply current vs. v in 120 122 124 126 128 130 132 134 136 138 140 2 2.5 3 3.5 4 4.5 5 5.5 6 v in (v) supply current (ua) 85 25 -45 v fb =0.5v supply current vs. v in 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 2 2.5 3 3.5 4 4.5 5 5.5 6 v in (v) supply current (ua) 85 25 -45 shutdown reference voltage vs. temperature 0.595 0.596 0.597 0.598 0.599 0.6 0.601 0.602 -60-50-40-30-20-10 0 102030405060708090 temperature ( ) reference voltage (v) v in =3.6v frequency vs. temerature 1.47 1.475 1.48 1.485 1.49 1.495 1.5 1.505 1.51 1.515 1.52 -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 60 62 64 66 68 70 72 74 76 78 80 22.533.544.555.56 v in (v) supply current (ua) 85 25 -45 v fb =0.65v line regulation 0.585 0.59 0.595 0.6 0.605 0.61 22.533.544.555.56 v in (v) reference voltage (v) t a =25 frequency vs. v in 1.45 1.46 1.47 1.48 1.49 1.5 1.51 1.52 1.53 1.54 1.55 22.533.544.555.56 v in (v) frequency (mhz) t a =25 switch leakage vs. input voltage 0 0.2 0.4 0.6 0.8 1 1.2 1234567 v in (v) switch leakage(na) synchronou main switch t a =25
fp6166 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. 0.65 9/19 function description control loop the fp6166 is a high efficiency current mode dual synchronous buck regulators. both the main (p-channel mosfet) and synchronous (n-channel mosfet) 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 current 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 bo ttom mosfet will be turn off to leave the sw pin into high impedance state. the fp6166?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 fp6166?s maximum duty cycle can reach 100%. that means the driver main switch is turn on through out whole clock cycle. once the dut y 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. power good a common-drain pin is built into fp6166 to output the power good signal. when the output voltage is not within 8.5% of regulation, fp6166 will pull its por output pin to ground. after both channels? outputs go within regulation, the por output pin will be released after 175ms. mode selection user can select pulse skip mode or pulse fre quency modulation operation in light loading by connecting mode / sync pin to v in or gnd. pulse frequency modulat ion provides better conversion efficiency with the penalty of a little larger out put ripple, which is around double than the pwm mode?s one.
fp6166 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. 0.65 10/19 synchronous mode when the mode / sync pin is conne cted to a clock, chip?s sw ou tputs will be synchronized to it automatically. the synchronous ran ge is from 0.5~1.5 time input clock frequency. in this mode, pulse skip mode is selected automatically. over current protection fp6166 limits the peak main switch current cycle by cycle. when over current happens, 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 w ill 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 fp6166 will shutdown automatically when the inte rnal junction temper ature reaches 150c to protect both the part and the system.
fp6166 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. 0.65 11/19 application information input capacitor selection the input capacitor must be connected to the vin pin and gnd pin of the fp6166 to maintain steady input voltage and filter out t he pulsing input current. 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 la rge 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 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 ? ? ?
fp6166 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. 0.65 12/19 the inductors in different shape and style are available 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 t he 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, ou tput 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, cout= output capacitance and il = ripple current in the inductor. for a fixed output voltage, the output ripple is highest at maximum input voltage since il increases with input voltage. 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 induce 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 x7r di electric formulations. these dielectrics have the best temperature and voltage characteristics of all the ceramics for a given value and size. 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 capacitor value case size component supplier model 4.7 0603 tdk c1608jb0j475m 10 0805 taiyo yuden jmk212bj106mg 10 0805 tdk c12012x5roj106k 22 0805 1206 tdk c2012jb0j226m
fp6166 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. 0.65 13/19 output voltage programming in the adjustable version, the output voltage is se t 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: pc board layout checklist 1. the power traces, consisting of the gnd trace, the sw trace and the v in trace should be kept short, direct and wide. 2. place cin near v in pin as closely as possible. to maintain input voltage steady and filter out the pulsing input current. 3. the resistive divider r1and r2 must be connec ted to fb pin directly 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 r outed. this reduces emi radiation on to the dc-dc converter?s own voltage feedback trace. 5. keep the gnd plates of c in and cout 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 the ground plane. it also reduces ground bounce at the fp6166 by giving it a low impedance ground connection. 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
fp6166 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. 0.65 14/19 suggested layout
fp6166 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. 0.65 15/19 typical application
fp6166 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. 0.65 16/19 i load : 100ma~1a i load : 200ma~1a ch1:v out ch4: i sw en on waveform (v out : 2.5v) ch1: en ch2: sw ch3: v out ch4: i sw ch1: v out ch4: 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
fp6166 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. 0.65 17/19 package outline msop-10l (ep) unit: mm symbols min. (mm) max. (mm) a 1.100 a1 0.000 0.150 a2 0.750 0.950 b 0.170 0.270 c 0.080 0.230 d 3.000 bsc. e 4.900 bsc. e1 3.000 bsc. e 0.500 bsc. l 0.400 0.800 l1 0.950 ref. 0 8
fp6166 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. 0.65 18/19 msop-10l (ep) continued exposed pad dimensions: note: 1. package dimensions are in compliance with jedec outline: mo-187 ba-t. 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) e2 1.715 ref d1 1.600 ref
fp6166 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. 0.65 19/19 dfn-10l unit: mm symbols min. (mm) max. (mm) a 0.700 0.800 a1 0.000 0.050 a3 0.20ref b 0.180 0.300 d 3.00 e 3.00 d2 2.200 2.700 e2 1.400 1.750 e 0.500 l 0.300 0.500 k 0.200

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