fp6298 low-noise 4.5a step-up cu rrent 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. 0.64 1/10 general description the fp6298 is a current mode boost dc-dc conver ter. it is pwm circuitry with built-in 0.08 ? power mosfet make this regulator highly power e fficient. the internal compensation network also minimizes as much as 6 external component counts. the non-inverting input of error amplifier connects to a 0.6v precision reference voltage and internal soft-start function can reduce the inrush current. the fp6298 is available in the sop-8l(ep) pa ckage and provides space-saving pcb for the application fields. features ? adjustable output up to 9v ? internal fixed pwm frequency: 500khz ? precision feedback reference voltage: 0.6v (2%) ? internal 0.08 ? , 4.5a, 12v power mosfet ? shutdown current: 0.1 a ? over temperature protection ? over voltage protection ? adjustable over current protection: 0.5a ~ 4.5a ? package: sop-8l(ep) applications ? chargers ? lcd displays ? digital cameras ? handheld devices ? portable products typical application circuit
fp6298 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. 0.64 2/10 function block diagram pin descriptions sop-8l(ep) name no. i / o description pgnd 1 p ic ground oc 2 i adjustable current limit (floating available) vcc 3 p ic power supply en 4 i enable control (active high) gnd 5 p ic ground fb 6 i error amplifier inverting input nc 7 na connect to gnd or floating cannot connect to other node lx 8 o power switch output ep 9 p exposed pad (must connect to ground)
fp6298 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. 0.64 3/10 marking information sop-8l(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
fp6298 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. 0.64 4/10 ordering information part number operating temperature package moq description FP6298XR-G1 -40 c ~ 85 c sop-8l(ep) 2500ea tape & reel absolute maximum ratings parameter symbol conditions min. typ. max. unit supply voltage v cc 0 6 v lx voltage v lx 0 12 v en,fb voltage 0 6 v thermal resistance (note1) ja sop-8l(ep) +83 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
fp6298 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. 0.64 5/10 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 0.2 ma average supply current i cc v fb =0.55v, switching 6.5 ma shutdown supply current i cc v en =gnd 0.1 a oscillator operation frequency f osc 400 500 600 kh 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 0.08 protection ocp current i ocp 4.5 a adjustable ocp current i ocp with external resistor 26k~500k 0.5 4.5 a otp temperature t otp +150 c
fp6298 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. 0.64 6/10 function description operation the fp6298 is a current mode boost converter. the switching frequency is 500khz and operates with pulse width modulation (pwm). build-in 12v / 4.5a mosfet provides a high output voltage. the control loop architecture is peak current mode contro l; therefore slope compensation circuit is added to the current signal to allow stable operation for duty cycles larger than 50%. soft start function soft start circuitry is integrated into fp6298 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 26k to 500k. the current limit will be set from 4. 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 . 0 + 3 r 110000 = i ocp over temperature protection (otp) fp6298 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 fp6298?s ovp threshold is 12v.
fp6298 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. 0.64 7/10 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. 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.
fp6298 this datasheet contains new product information. feeling techno logy reserves the rights to modify the product specification wi thout notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.64 8/10 l1 gnd vin c1 1 8 6 fp6298 5 c2 vout r2 c4 2 r3 3 r1 d1 4 7 via to gnd c3 suggested layout
fp6298 this datasheet contains new product information. feeling techno logy reserves the rights to modify the product specification wi thout notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.64 9/10 typical application 2 3 4 vin 3.7v 1 c2 22f c1 22f r3 26k fp6298 oc v cc en nc gnd fb 7 6 5 vout 5v pgnd lx 8 d1 sr54 r1 73k r2 10k c3 22f c4 22f l1 3.3h note: don?t pull the vout back to the fp6298?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.
fp6298 this datasheet contains new product information. feeling techno logy reserves the rights to modify the product specification wi thout notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sales of the product. website: http://www.feeling-tech.com.tw rev. 0.64 10/10 package outline sop-8l(ep) unit: mm exposed pad dimensions: note: 1. package dimensions are in complia nce with jedec outline: ms-012 aa. 2. dimension ?d? does not include mold ing flash, protrusions or gate burrs. 3. dimension ?e? does not include inter-lead flash or protrusions. symbols min. (mm) max. (mm) a 1.346 1.752 a1 0.050 0.152 a2 1.498 d 4.800 4.978 e 3.810 3.987 h 5.791 6.197 l 0.406 1.270 0 8 symbols min. (mm) max. (mm) e1 2.184 ref d1 2.971 ref
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