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FP6291 1mhz, 2.5a step-up current mode pwm converter 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. 0.70 1/11 gene r al description the FP6291 is a current mode boost dc-dc conv erter. its pwm circuitry with built-in 0.2 ? power mosfet make this regulator highly power efficient. the internal compensation network also minimizes as much as 6 external component counts. the non-inv erting input of error amplifier connects to a 0.6v precision reference voltage and internal soft-st art function can reduce the inrush current. the FP6291 is available in the sot23-6l pa ckage and provides space-saving pcb for the application fields. features ? adjustable output up to 12v ? internal fixed pwm frequency: 1.0mhz ? precision feedback reference voltage: 0.6v (2%) ? internal 0.2 ? , 2.5a, 16v power mosfet ? shutdown current: 0.1 a ? over temperature protection ? over voltage protection ? adjustable over current protection: 0.5a ~ 2.5a ? package: sot23-6l applications ? chargers ? lcd displays ? digital cameras ? handheld devices ? portable products typical application circuit
FP6291 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. 0.70 2/11 function block diagram pwm comp. error amp . . current sense amp. control and driver logic otp oscillator slope compensation pgnd lx v cc en uvlo shutdown circuitry fb 0. 6 v 1 mhz soft start gnd adjustable current limit oc 19k ~ 96 k 2.5 a ~ 0. 5 a ovp pin descriptions sot23-6l 1 2 3 6 5 4 oc en lx gnd fb v cc al986 top view name no. i / o description lx 1 o power switch output gnd 2 p ic ground fb 3 i error amplifier inverting input en 4 i enable control (active high) v cc 5 p ic power supply oc 6 i adjustable current limit (floating available)
FP6291 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. 0.70 3/11 marking information sot23-6l lot number part number code year al986 lot numbe r : wafer lot number?s last two digits for example: 132386tb ? 86 y ea r : production year?s last digit part number code : part number identification code for this product. it should be always ?al?.
FP6291 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. 0.70 4/11 ordering information part number code operating temperature package moq description FP6291lr-g1 al -40 c ~ 85 c sot23-6l 3000ea tape & reel absolute maximum ratings parameter symbol conditions min. typ. max. unit supply voltage v cc 0 6 v lx voltage v lx 0 16 v en,fb voltage 0 6 v power dissipation p d sot23-6l @t a =25 c 455 mw thermal resistance (note1) ja sot23-6l +220 c / w junction temperature t j +150 c operating temperature t op -40 +85 c storage temperature t st -65 +150 c lead temperature (soldering, 10 sec) +260 c note1: ja is measured in the natural convection at t a =25 c on a low effective thermal conductivity test board of jedec 51-3 therma l measurement standard. ir re-flow soldering curve
FP6291 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. 0.70 5/11 recommended operating conditions parameter symbol conditions min. typ. max. unit supply voltage v in 2.6 5.5 v operating temperature range t a ambient temperature -40 +85 c dc electrical characteristics (v cc =3.3v, t a =25 c ,unless otherwise specified) parameter symbol conditions min. typ. max. unit system supply input input supply range v cc 2.6 5.5 v under voltage lockout v uvlo 2.2 v uvlo hysteresis 0.1 v quiescent current i cc v fb =0.66v, no switching 0.19 ma average supply current i cc v fb =0.55v, switching 2.84 ma shutdown supply current i cc v en =gnd 0.1 a oscillator operation frequency f osc v fb =1.0v 0.8 1.0 1.2 mh z frequency change with voltage f / v v cc =2.6v to 5.5v 5 % maximum duty cycle t duty 90 % reference voltage reference voltage v ref 0.588 0.6 0.612 v line regulation v cc =2.6v 5.5v 0.2 % / v enable control enable voltage v en 0.96 v shutdown voltage v en 0.6 v mosfet on resistance of driver r ds (on) i lx =2a 0.2 protection ocp current i ocp 2.5 a adjustable ocp current i ocp with external resistor 19k~96k 0.5 2.5 a otp temperature t otp +150 c
FP6291 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. 0.70 6/11 typical operating characteristics (v cc =3.3v, v out =5v, t a = 25c, unless otherwise noted) efficiency vs. output current 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 output current (a) efficiency (%) current limit vs. external resistance (roc) 0 0.5 1 1.5 2 2.5 3 3.5 10 20 30 40 50 60 70 80 90 100 external resistance (k ? ) current limit (a) operation frequency vs. input voltage 1.02 1.04 1.06 1.08 1.1 1.12 1.14 1.16 23456 input voltage (v) operation frequency (mhz) operation frequency vs. temperature 1 1.02 1.04 1.06 1.08 1.1 -40 -20 0 20 40 60 80 100 temperature (c) operation freqency (mhz) reference voltage vs. input voltage 0.6 0.601 0.602 0.603 0.604 0.605 0.606 0.607 23456 input voltage (v) feedback voltage (v) reference voltage vs. output current 0.6 0.601 0.602 0.603 0.604 0.605 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 output current (a) feedback voltage (v) quiescent current vs. input voltage 120 150 180 210 240 270 23456 input voltage (v) quiescent current (ua) average supply current vs. input voltage 0.5 1 1.5 2 2.5 3 3.5 4 4.5 23456 input voltage (v) average supply current (ma) v in =5v, v out =9v
FP6291 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. 0.70 7/11 function description operation the FP6291 is a current mode boost converter. the constant switching frequency is 1mhz and operates with pulse width modulation (pwm). build -in 16v / 2.5a mosfet provides a high output voltage. the control loop architecture is peak cu rrent mode control; therefore slope compensation circuit is added to the current signal to allow st able operation for duty cycles larger than 50%. soft start function soft start circuitry is integrated into FP6291 to av oid inrush current during power on. after the ic is enabled, the output of error amplifier is clamped by the internal soft-start function, which causes pwm pulse width increasing slowly and thus reducing input surge current. current limit program a resistor between oc and gnd pin programs peak switch current. the resistor value should be between 19k and 96k. the current limit will be set from 2. 5a to 0.5a. keep traces at this pin as short as possible. do not put capacitance at this pin. to set the over current trip point according to the following equation: 3 r 48000 i ocp ? over temperature protection (otp) FP6291 will turn off the power mosfet automatically when the internal junction temperature is over 150 c . the power mosfet wake up when the junction temperature drops 30 c under the otp threshold temperature. over voltage protection (ovp) in some condition, the resistive divider may be unconnected, which will cause pwm signal to operate with maximum duty cycle and output vo ltage is boosted higher and higher. the power mosfet will be turned off immediately, when the out put voltage exceeds the ovp threshold level. the FP6291?s ovp threshold is 16v.
FP6291 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. 0.70 8/11 application information inductor selection inductance value is decided based on different condition. 3.3uh to 4.7h inductor value is recommended for general application circuit. there ar e three important inductor specifications, dc resistance, saturation current and core loss. low dc resistance has better power efficiency. also, it avoid inductor saturation which w ill cause circuit system unstable and lower core loss at 1 mhz. capacitor selection the output capacitor is required to maintain the dc voltage. low esr capacitors are preferred to reduce the output voltage ripple. ceramic capa citor of x5r and x7r are recommended, which have low equivalent series resistance (esr ) and wider operation temperature range. diode selection schottky diodes with fast recovery times and low forward voltages are recommended. ensure the diode average and peak current rating exceed the average output current and peak inductor current. in addition, the diode?s reverse breakdown vo ltage must exceed the output voltage. output voltage programming the output voltage is set by a resistive voltage di vider from the output voltage to fb. the output voltage is: ? ? ? ? ? ? ? ? 2 r 1 r 1 v 6 . 0 v out layout considerations 1. the power traces, consisting of th e gnd trace, the lx trace and the v cc trace should be kept short, direct and wide. 2. lx l and d switching node, wide and short trace to reduce emi. 3. place c in near v cc pin as closely as possible to maintain input voltage steady and filter out the pulsing input current. 4. the resistive divider r1and r2 must be connected to fb pin directly as closely as possible . 5. fb is a sensitive node. please keep it away from switching node, lx. 6. the gnd of the ic, c in and c out should be connected close together directly to a ground plane.
FP6291 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. 0.70 9/11 suggested layout
FP6291 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. 0.70 10/11 typical application note: don?t pull the vout back to the FP6291?s vcc pin. when the system receives the noise, it will lead to vout ripple too high and over the absolute maximum rating of the vcc pin.
FP6291 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. 0.70 11/11 package outline sot23-6l unit: mm note: 1. package dimensions are in compliance with jedec outline: mo-178 ab. 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 1.450 a1 0.050 0.150 a2 0.900 1.300 b 0.300 0.500 c 0.080 0.220 d 2.900 bsc e 2.800 bsc e1 1.600 bsc e 0.950 bsc e1 1.900 bsc l 0.300 0.600 l1 0.600 ref l2 0.250 bsc 0 8 1 3 7 2 6 15

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