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fp6168 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. 0.62 1/12 general description the fp6168 is a high efficiency current mode dual 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 conduction loss. to extend battery life for portable application, 100% duty cycle is supporte d for low-dropout operation. shutdown mode also helps saving the current consumption. the fp6168 is packaged in dfn-10l 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: 160 a ? no schottky diode required ? built-in soft start ? current mode operation ? over temperature protection ? package: dfn-10l (ep) applications ? cellular telephone ? wireless and dsl modems ? digital still cameras ? portable products ? mp3 players
fp6168 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 2/12 typical application circuit function block diagram
fp6168 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 3/12 pin descriptions dfn-10l (ep) marking information dfn-10l (ep) halogen free lot number internal id per-half month year fp6168 name no. i/o description en1 1 p enable / uvlo fb1 2 i first channel feedback v in 2 3 p second channel power supply gnd 4 i ground sw2 5 o second channel switch output en2 6 p enable / uvlo fb2 7 i second channel feedback v in 1 8 p first channel power supply gnd 9 p ground sw1 10 o first channel switch output ep 11 p exposed pad - must connect to ground 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
fp6168 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 4/12 ordering information 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 thermal resistance (junction to ambient) ja dfn-10l +60 c / w thermal resistance (junction to case) jc dfn-10l +10 c / w junction temperature +150 c storage temperature -65 +150 c lead temperature (soldering, 10 sec) dfn-10l +260 c ir re-flow soldering curve part number operating temperature package moq description FP6168DR-G1-ADJ -40 c ~ +85 c dfn-10l 2500ea tape & reel
fp6168 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 5/12 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 0.585 0.6 0.615 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 -40 c ~+85 c 2.5 5.5 v shutdown, v run =0v 0.1 1 a active, v fb =0.5v, v run =v in 200 a quiescent current i cc pfm, v fb =0.7v, v run =v in 160 a run threshold v run -40 c ~+85 c 0.3 1 1.5 v run leakage current i run -40 c ~+85 c 0.01 1 a oscillator frequency f osc v fb =0.6v, -40 c ~+85 c 1.2 1.5 1.8 mhz
fp6168 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 6/12 typical operating characteristics (t a = 25 c , v in =3.6v, 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 22.533.544.555.56 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
fp6168 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 7/12 function description control loop the fp6168 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 fp6168?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 fp6168?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. over current protection fp6168 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 fp6168 will shutdown automatically when the internal junction temperature reaches 150 to protect both the part and the system.
fp6168 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 8/12 application information input capacitor selection the input capacitor must be connected to the v in pin and gnd pin of fp6168 to maintain steady input voltage and filter out the pul sing 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 discontin uous 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 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 ? ? ?
fp6168 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 9/12 the inductors in different shape and style are av ailable 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 (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 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 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 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.
fp6168 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 10/12 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 maintain input voltage steady and filter out the pulsing input current. 3. the resistive divider r1 and r2 must be connect ed to fb pin directly and 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 pcb la yer 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 the ground plane. it also reduces ground bounce at fp6168 by giving it a low impedance ground connection.
fp6168 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 11/12 9 8 3 5 4 1 2 6 7 10 via to v out1 r 11 r 12 c c1 c out1 l1 v out2 c out2 v out1 c c2 r 22 v in 1 v in 2 c in1 c in2 fp6168 l2 via to v out 2 via to v via to v via to v in 2 via to v via to v in1 r 21 suggested layout typical application
fp6168 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 12/12 package outline dfn-10l m 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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