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FP6290 low-noise 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. 0.62 1/12 v cc en lx fb gnd ss comp freq FP6290 6 3 1 4 5 v out / 9.2v 2 7 8 + d sm340a v in / 3~3.6v general description the FP6290 is a current mode boost dc-dc conver ter. its pwm circuitry with built-in 0.2 power mosfet makes this converter highly power efficiently. selectable high switching frequency allows faster loop response and easy filtering with a low noise output. the non-inverting input its error amplifier is connected to an internal 1.24v pr ecision reference voltage. soft-start time can be programmed with an external capacitor, which sets the input current ramp rate. current mode control and external compensation network make it easy and flexible to stabilize the system. the FP6290 is available in the msop-8l pack age. combined with low esr capacitors, it reduced pcb space for step-up applications. features ? adjustable output from v cc to 12v ? internal fixed pwm fre quency: 640khz / 1.2mhz ? frequency selection pin ? precision feedback reference voltage: 1.24v ? internal 0.2 , 1.6a, 14v power mosfet ? external programmable soft-start function (ss) ? shutdown current : 0.1 a ? over current protection ? package: msop-8l applications ? lcd display ? digital camera ? handheld device ? portable product typical application circuit
FP6290 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 2/12 function block diagram 5 7 1 8 lx freq fb comp 1.24v error amp . power on / off control and driver logic oscillator bias slope compen - sation 5 a current sense amp. 6 gnd 3 en + + + + pwm comp . 2 4 vcc ss soft start 4a
FP6290 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 3/12 pin descriptions msop-8l FP6290 marking information msop-8l halogen free lot number per-half month year FP6290 internal id name no. i / o description comp 1 o error amplifier compensation output fb 2 i error amplifier inverting input en 3 i enable control gnd 4 p ic ground lx 5 o switch output v cc 6 p ic power supply freq 7 o frequency selection ss 8 i soft-start control 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
FP6290 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 4/12 ordering information part number operating temperature package moq description FP6290tr-lf -40 c ~ +85 c msop-8l 3000ea tape & reel absolute maximum ratings parameter symbol conditions min. typ. max. unit supply voltage v cc 6 v rms lx current 1.2 a lx to gnd -0.3 14 v ss,comp to gnd -0.3 v cc +0.3 v en,freq,fb to gnd -0.3 v cc v junction temperature tj +150 storage temperature ts -65 +150 thermal resistance ja msop-8l 172 / w jc 71 / w lead temperature (soldering, 10 sec) +260 suggested ir re-flow soldering curve
FP6290 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 5/12 recommended operating conditions parameter symbol conditions min. typ. max. unit supply voltage v in 2.6 5.5 v operating temperature -40 85 c dc electrical characteristics (v in =3v, t a = 25 c , v freq =0v, unless otherwise noted) parameter symbol test conditions min. typ. max. unit reference section output voltage v ref comp connected to fb 1.222 1.240 1.258 v line regulation v ref / v ref v cc =2.6v 5.5v 0.05 % / v output voltage change with temperature t a =-40 to 25 1 % t a = 25 to 85 1 % under voltage lockout section upper threshold voltage (v cc ) v upper t a =25 2.38 2.53 v lower threshold voltage (v cc ) v low 2.33 2.48 v hysteresis (v cc ) v hys 50 mv soft-start section reset switch resistance r ss 100 input source current i ss v ss =1.2v 1.5 4.0 7.0 a oscillator section frequency f freq=gnd 540 640 740 kh z freq=v cc 1.00 1.22 1.50 mhz frequency change with voltage f / v v cc =2.6v to 5.5v 2 % / v frequency change with temperature f / v t a =-40 to 85 10 % maximum duty cycle t duty freq=gnd 79 88 % freq=v cc 88 % error?amplifier section fb input bias current i bias v fb =1.24v 40 na trans-conductance gm i=5 a 70 140 240 a / v voltage gain av 700 v / v output section nmos current limit i lim v fb =1v,duty cycle=65% 1.2 1.6 2.3 a nmos on resistance r ds (on) i lx =1.2a 0.2 0.5 ? output leakage current i lxoff v lx =12v 0.01 20 a current-sense trans-resistance r cs 0.56 v / a
FP6290 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 6/12 parameter symbol test conditions min. typ. max. unit control input section input high voltage v ih en,freq pin v cc =2.6v~5.5v 0.7v cc v input low voltage v il en,freq pin v cc =2.6v 5.5v 0.3 v cc v hysteresis en,freq 0.1v cc v freq pull-down current i freq 1.8 5 9 a en input current i en 1 na total device disable supply current i disable en=gnd 0.1 10 a standby supply current i sby v fb =1.3v 0.20 0.35 ma average supply current i avg v fb =1.0v 2.0 5.0 ma
FP6290 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 7/12 typical operating characteristics (t a = 25 c , unless otherwise noted) efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current (ma) efficiency (%) 640khz 1.2mhz efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current (ma) efficiency (%) 640khz 1.2mhz efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current (ma) efficiency (%) 640khz 1.2mhz no-load supply current vs. input voltage 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 2.5 3 3.5 4 4.5 5 5.5 input voltage(v) no-load supply current(ma ) 640khz 1.2mhz output voltage vs. output current 11.5 11.6 11.7 11.8 11.9 12 12.1 12.2 0 20 40 60 80 100 120 140 160 180 200 output current (ma) output voltage (v) ta=-30 ta=25 ta=85 maximum output current vs. input voltage 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5 input voltage (v) maximum output current (a) vout=5v vout=12v v cc =3.3v v out =5v v out =5v fosc=640kh z v cc =3.3v v out =12v fosc=640kh z v cc =5v v out =12v
FP6290 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 8/12 ch1=inductor current,ch3=lx,ch4= v out ac-coupled v cc =3.3v, v out =12v i load =200ma freq=1.2mhz ch1=inductor current,ch3=en,ch4=v out v cc =3.3v, v out =12v i load =10ma~200ma frequency=640khz ch1=inductor current,ch4= v out v cc =3.3v, v out =12v i load =10ma fre q uenc y =640khz ch1=inductor current,ch3=en,ch4=v out v cc =3.3v, v out =12v i load =200ma fre q =640khz
FP6290 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 9/12 function description voltage reference a 1.24v reference regulator supp lies to the FP6290 error amplif iers non-inverting terminal . error amplifier the error amplifier compares a sample of the dc-dc converter output voltage with the 1.24v (v ref ) reference and generates an error signal for the pwm comparator. output voltag e of dc-dc converter is setting with the resistor divider by the following equation: 24 . 1 2 r 1 r 1 v out ? ? ? ? ? ? ? ? ? 2 1 1.24v r comp v out t r1 r2 c comp FP6290 error amplifier oscillator the switching frequency of FP6290 can be selected to operate at either 640khz or 1.2mhz. connect the freq pin to gnd for 640khz operation, or v cc for 1.2mhz operation. freq pin has an internal pull-down current around 5 a. it gives user the option of selecting 640khz operation by leaving freq unconnected. soft start the soft start is functional after power on. the interval of soft start time is determined by a capacitor connected to ss pin. when en pin is taken high, the soft start capacitor (c ss ) is charged by a constant current of 4 a (typ). during this interval, the ss vo ltage directly controls the peak inductor current. the maximum load current is available after the soft-start interval is completed. once the en pin is taken low, the soft-start capacitor is di scharged to ground to prepare for next start-up.
FP6290 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 10/12 the load must wait for the soft-start interval to finish before drawing a significant amount of load current. the duration after which the load c an begin to draw maximum load current is: ss 5 max c 10 77 . 6 t ? ? en the FP6290 can be turn off to reduce the supply current to 0.1 a when en is low. in this mode, the internal reference, error amplifier, comparator s, and biasing circuitry turn off while the n-channel mosfet is turned off. the boost conv erter?s output is connected to v cc by the external inductor and catch diode. output current capability the output current capability of the FP6290 is a fu nction of current limit, input voltage, operation frequency, and inductor value. because of the slope compensation used to stabilize the feedback loop, the duty cycle affects the current limit. the output current capability is governed by the following equation: ?? out in in lim ) max ( out v / v ) l fosc /( v duty 5 . 0 ) duty 4 . 0 26 . 1 ( i i ? ? ? ? ? ? ? ? ? ? ? where: i lim =current limit specified at 65% duty=duty cycle= diode on lim out diode in out v r i v ) v v v ( ? ? ? ? ? v diode =catch diode forward voltage at ilim =conversion efficiency,85%nominal current limitation the internal power-mos switch current is monitore d cycle-by-cycle and is limited to the value not exceed 1.6a (typ.). when the switch current reac hes the limited value, the internal power-mos is turned off immediately until the next cycle.
FP6290 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 11/12 v cc en lx fb gnd ss comp freq FP6290 6 3 1 4 5 r3 47k c7 0.1f c6 47f r2 300k v out / 9.2v c5 0.033f l1 4.7f 2 7 8 c1 47f c2 0.1f c3 10pf c4 1500pf r1 7.5k + d sm340a v in / 3~3.6v c10 1f c8 1f c11 0.1f c9 0.1f c12 0.1f c13 4.7f d4 bav99 / sot-23l d3 bav99 / sot-23l v out / 27v v out / -9.2v 2 3 2 3 d2 bav99 / sot-23l 3 2 1 1 1 typical application figure 1 typical application circuits figure 2 tft panel power supply application circuits
FP6290 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 12/12 package outline msop-8l unit: mm note: 1. package dimensions are in compliance with jedec outline: mo-187 aa. 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 1.100 a1 0.000 0.150 a2 0.750 0.950 d 3.000 bsc e 4.900 bsc e1 3.000 bsc l 0.400 0.800 l1 0.950 ref 0 8

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