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fp6189 3a, 23v, 385khz step-down converter 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. 0.61 1/14 fp6189 bs in gnd ss fb v in 12v en sw comp 1 2 3 4 v out 3.3v 5 6 7 8 en general description the fp6189 is a buck regulator with a built-i n internal power mosfet. it can provide 3a continuous output current over a wide input supply range with ex cellent load and line regulation. current mode operation provides fast transient response and eases loop stabilization. the device includes cycle-by-cycle current limiting and thermal shutdown protection. adjustable soft-start reduces the stress on the input source during power-on. the regulator only consumes 20 a supply current in shutdown mode. the fp6189 requires a minimum number of readily available external components to complete a 3a buck regulator solution. features ? 3a output current ? adjustable soft-start ? 0.1 internal high side power mosfet switch ? stable with low esr output ceramic capacitors ? up to 95% efficiency ? 20 a shutdown mode current ? fixed 385khz frequency ? thermal shutdown ? cycle-by-cycle over current protection ? wide 4.75 to 23v operating input range ? output adjustable from 0.92v to 21v ? available sop-8l (ep) ? under voltage lockout applications ? distributed power systems ? battery charger ? pre-regulator for linear regulators typical application circuit
fp6189 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. 0.61 2/14 function block diagram pin descriptions sop-8l (ep) name no. i / o description bs 1 o bootstrap in 2 p supply voltage sw 3 o switch gnd 4 p ground fb 5 i feedback comp 6 o compensation en 7 i enable / uvlo ss 8 o programmable soft start ep 9 p exposed pad is gnd
fp6189 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. 0.61 3/14 ic date code identification halogen free lot number mass production version per-half month year fp6189 halogen free : halogen free product indicator lot numbe r : wafer lot number?s last two digits for example: 132371tb ? 71 mass production version : mass production mask version 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
fp6189 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. 0.61 4/14 ordering information part number operating temperature package moq description FP6189X-G1 -40 c ~ +85 c sop-8l (ep) 100ea tube fp6189xr-g1 -40 c ~ +85 c sop-8l (ep) 2500ea tape & reel moq: minimum ordering quantity absolute maximum ratings parameter symbol conditions min. typ. max. unit in pin supply voltage v in -0.3 24 v sw pin voltage v sw -1 v in +0.3 v bs pin voltage v bs v sw -0.3 v sw +6 v all other pins -0.3 6 v junction to ambience thermal resistance ja sop-8l (ep) 60 c / w junction to case thermal resistance jc sop-8l (ep) 10 c / w junction temperature t j -65 150 c storage temperature -65 150 c operating temperature -40 85 c lead temperature (soldering, 10 sec) sop-8l 260 c suggested ir re-flow soldering temperature curve
fp6189 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. 0.61 5/14 recommended operating conditions parameter symbol conditions min. typ. max. unit supply voltage v in 4.75 23 v operating temperature -40 85 c dc electrical characteristics (v in =12v, t a = 25 c , unless otherwise noted) parameter symbol conditions min. typ. max. unit shutdown supply current l st v en =0 20 30 a supply current i cc v en =2.6v, v fb= 1.4v 1 1.2 ma feedback voltage v fb v in =12v, v comp <2v 0.892 0.92 0.948 v error amplifier voltage gain g ea 400 v / v error amplifier trans- conductance i c =10a 500 800 a / v high side switch on resistance r on-hs 0.1 low side switch on resistance r on-ls 10 high side switch leakage current i il v en =0v, v sw =0v 0.1 10 a current limit i cl 5.5 a current sense to comp tran-conductance 4.4 a / v oscillation frequency f osc 335 385 435 khz short circuit oscillation frequency v fb =0v 40 64 88 khz maximum duty cycle v fb =1.0v 90 % minimum duty cycle v fb =1.5v 0 % under voltage lockout threshold v uvlo v en rising 2.37 2.54 2.71 v under voltage lockout threshold hysteresis v hys 210 mv en threshold voltage v en 0.9 1.2 1.5 v en pin pull up current i en v en =0v 1.1 1.8 3 a soft start period v ss c ss =0.1 f 10 ms thermal shutdown t ts 150 c
fp6189 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. 0.61 6/14 typical operating characteristics (v in =12v, v out =3.3v, t a = 25 c , unless otherwise noted) figure 1 power on figure 3 en pin enable figure 5 load 3a ripple figure 2 power off figure 4 en pin disable figure 6 load step v in v out i l sw v in v out i l sw en v out i l sw en v out i l sw v out i l sw v out i l i load =0.4a i load =2a
fp6189 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. 0.61 7/14 60 65 70 75 80 85 90 95 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 a % 2.5v 3.3v 5v figure 7 efficiency (v in =7v) 60 65 70 75 80 85 90 95 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2a % 2.5v 3.3v 5v figure 8 efficiency (v in =10v)
fp6189 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. 0.61 8/14 function description the fp6189 is a current-mode buck regulator. it regul ates input voltages from 4.75v to 23v down to an output voltage as low as 0.92v with maxi mum 3a load current. the fp6189 uses current-mode control to regulate the output vo ltage. the output voltage is measur ed at fb pin through a resistive voltage divider and amplified by the internal error amplifier. the output current of the trans-conductance error amplifier is presented at comp pin where a network compensates the regulation control system. the volt age at comp pin is compared to the switch current measured internally to control the output voltage. the conver ter uses an internal n-channel mosfet switch to step-down the input voltage to t he regulated output voltage. since the n-channel mosfet requires a gate voltage greater than the input voltage, a boost capacitor connected between sw and bs pins is needed to drive the mos gate. the ca pacitor is internally charged while the mos switch is off. another internal built-in 10 switch from sw to gnd is used to in sure that sw is pulled to gnd when the switch is off to fully charge the bs pin capacitor. output voltage (v out ) the output voltage is set using a resistive volt age divider from the output voltage to fb. the voltage divider divides the output voltage down by the ratio: 4 2 4 out fb r r r v v ? ? ? thus the output voltage is: 4 4 2 fb out r r r v v ? ? ? a typical value for r 4 can be as high as 100k, but a typical value is 10k. enable mode / shutdown mode drive en pin to ground to shut down the fp6189. shutdown mode forces the internal power mosfet off, turns off all inter nal circuitry, and reduces the v in supply current to 20 a (typ.). the en pin rising threshold is 1.2v (typ.). before any oper ation begins, the voltage at en pin must exceed 1.2v (typ.). the en pin input has a 100mv hysteresis. boost high-side gate drive (bst) since the mosfet requires a gate voltage greater than the input voltage, user should connect a flying bootstrap capacitor between sw and bs pin to provide the gate-drive voltage to the high-side n-channel mosfet switch. the capacitor is charged by the internally regulator periodically when sw
fp6189 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. 0.61 9/14 pin is pulled to ground. during startup, an internal low-side switch pulls sw pin to ground and charges the bst capacitor to internally regulator output voltage. once the bst capacitor is charged, the internal low-side switch is turned off and the bst capacitor provides the necessary enhancement voltage to turn on the high-side switch. thermal shutdown protection the fp6189 features integrated thermal shutdown protection. thermal shutdown protection limits allowable power dissipation (p d ) in the device and protects the device in the event of a fault condition. when the ic junction temperature exceeds +150 c , an internal thermal sensor signals the shutdown logic to turn off the internal power mosfet and a llow the ic cooling down. the thermal sensor turns the internal power mosfet back on after the ic junction temperature cools down to +110 c , resulting in a pulsed output under continuous thermal overload conditions.
fp6189 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. 0.61 10/14 application information input capacitor selection the input current of the step-down converter is di scontinuous, therefore a capacitor is required to supply the ac current to the step-down converter while maintaining the dc input voltage. use low esr capacitors for the best performance. ceramic capaci tors are preferred, but tantalum or low-esr electrolytic capacitors may also suffice. the input capacitor can be electrolytic, tantalum or ceramic. when electrolytic or tantalum capacitors are used, a small, high quality 0.1 f ceramic capacitor should be placed beside the ic as close as possible. when using ceramic capacitors, make sure that they have enough ca pacitance to provide sufficient charge to prevent excessive voltage ripple at converter input. the input voltage ripple can be estimated by ) d 1 ( d v f i c in o in ? ? ? ? ? inductor selection the inductor is required to supply current to the output load while being driven by the switched input voltage. a larger value inductor will result in le ss ripple current that will result in lower output ripple voltage. however, the larger value inductor will have a larger physical size, higher series resistance, and/or lower saturation current. a good rule for determining the inductance to use is to allow the peak-to-peak ripple current in the inductor to be approximately 30% of the maximum switch current. also, make sure that the peak inductor current is below the maximum switch current limit. the inductance value can be calculated by ) d 1 ( f i v v l o d o ? ? ? ? ? where is the ripple current ratio rms current in inductor 12 1 i i 2 o lrms ? ? ? output capacitor selection the output capacitor is required to maintain t he dc output voltage. ceramic, tantalum, or low esr electrolytic capacitors are recommended. low esr capacitors are preferred to keep the output voltage ripple low. the output voltage ripple can be estimated by:
fp6189 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. 0.61 11/14 ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? out in out in out out c f 8 1 esr v l f v v v v in the case of ceramic capacitors, the output ripple is dominated by the capacitance value because of its low esr. in the case of tantalum or electrolytic capacitors, the capacitor high esr dominates the output ripple. followings are eq uations for determining appropriate capacitor parameters. . ceramic capacitors: choose capacitance value ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? in out out 2 out out v v 1 v l f 8 v c . tantalum or electrolytic capacitors: choose capacitor with esr value ?? out in out in out v v v v l f v esr ? ? ? ? ? ? ? pc board layout checklist 1. the power traces, consisting of the gnd, sw and v in traces, should be kept short, direct and wide. 2. place c in near in pin as closely as possible to maintain input voltage s teady and filter out the pulsing input current. 3. the resistive divider r 2 and r 4 must be connected directly to fb pin 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 anothe r layer and have a ground pla ne between the top and feedback trace routing layer. this reduces emi radiation on to the dc-dc converters own voltage feedback trace.
fp6189 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. 0.61 12/14 suggested layout
fp6189 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. 0.61 13/14 typical application fp6189 bs in gnd ss fb v in 12v en sw comp c6 220f c8 0.1f 1 2 3 c1 10nf 4 c4 470f r2 16k v out 3.3v r4 6.2k 5 6 7 8 c11 22nf r3 10k c10 4.7nf c9 510pf d1 sm340a l1 10h en
fp6189 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. 0.61 14/14 package outline sop-8l (ep) unit: mm exposed pad dimensions: note: 1. package dimensions are in compliance with jedec outline: mo-178 aa. 2. dimension ?d? does not include moldi ng 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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