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rev. 1.11 1 august 12, 2016 rev. 1.00 pb august 12, 2016 HT7463A/ht7463b 52v/600ma, 1.25mhz/550khz asynchronous step down converter features ? wide input v oltage range 4.5v to 52v ? 52v / 0.9 internal power mosfet ? 600ma peak output current ? up to 90% effciency ? 1.25mhz (HT7463A) and 550khz (ht7463b) fixed operating frequenc y ? ultra low shutdown current < 1 a ? output short circuit protection ? thermal shutdown protection ? package t ype: sot23-6 applications ? power meters ? distribution power systems ? battery chargers ? pre-regulator for linear regulators general description the h t7463a/b is a current mode buck converter . with a wide input range from 4.5v to 52v , the ht 7463a/b i s sui table for a wi de ra nge of applications such as power conditioning from unregulated sources. having a low internal switch typical rdson value of 0.9, the device has a good operating t ypical e fficiency v alue o f 8 5% a nd t he added advantage of reduced junction temperature. the operating frequency is fxed at 1250/550khz for the HT7463A/ht7463b res pectively. the HT7463A allows the use of small external components while still being able to have low output voltage ripple. a soft-start function can be implemented using the enable pin and by connecti ng an ext ernal rc ci rcuit allowing the user to tailor the soft-start time to a specifc application. application circuit cb gnd fb sw vin en c b 0.1f v out =12v * 1 l1 22h/47h * 3 d1 c3 0.1f c4 22f * 2 r2 6k / 1% r1 84k / 1% c1 0.1f c2 100f on/off control v in 1 2 3 4 5 6 HT7463A/b note: *1. c4=330 f is recommended to achieve 1 output ripple requirement *2. set r1=84k and r2=16k for v out =5v application *3. its recommended that l1=22h for HT7463A and l1=47h for ht7463b
rev. 1.11 2 august 12, 2016 HT7463A/ht7463b block diagram sw cb vcc control logic current sense amp. 1.25mhz/550khz oscillator ocp current comparator pwm comparator error amp. ss/osp 0.794v fb vref gnd vin en regulator 0.9 otp vcc uvlo fb vref pin assignment top view sot 23 -6 463x 6 5 4 321 gnd cb fb vin sw en x means a(1.25mhz)/or b(550khz)
rev. 1.11 3 august 12, 2016 HT7463A/ht7463b pin descpription pin order name type pin discpription 1 cb i/o sw fet gate bias voltage. connect the boot capacitor between cb and sw 2 gnd g ground terminal 3 fb i feedback pin: set feedback voltage divider ratio with v out = v fb (1+(r1/r2)) 4 en i logic level shutdown pin. internal pull low resistor 5 vin p power supply 6 sw o power fet output absolute maximum ratings parameter value unit vin and sw -0.3 to +55 v en -0.3 to (v in +0.3) v cb above sw voltage +5.5 v fb -0.3 to +5.0 v operating temperature range -40 to +85 c maximum junction temperature +150 c storage temperature range -65 to +160 c lead temperature (soldering 10sec) +300 c esd susceptibility human body model 2000 v machine model 200 v junction-to-ambient thermal resistance, ja 220 c/w junction-to-case thermal resistance, jc 110 c/w recommended operating range parameter value unit vin 4.5 to 52 v sw and en up to 52 v note that absolute maximum ratings indicate limitations beyond which damage to the device may occur. recommended operating ratings indicate conditions for which the device is intended to be functional, but do not guarantee specifed performance limits.
rev. 1.11 4 august 12, 2016 HT7463A/ht7463b electrical characteristics v in =12v and t j=+25c, unless otherwise specifed symbol parameter test condition min typ max unit supply voltage v in input voltage vin 4.5 52 v i cc quiescent current v en =2.5v, v fb =1v 0.7 1 ma i off shutdown current v en =0v 0.1 1 a buck converter v out output voltage* 1.0 0.9v in v f sw switching frequency HT7463A, v fb =0.6v 1000 1250 1500 khz ht7463b, v fb =0.6v 440 550 660 khz f fb fold-back frequency HT7463A, v fb =0v 90 105 khz ht7463b, v fb =0v 90 105 khz d max maximum duty cycle HT7463A 90 % ht7463b 95 % t on(min) minimum on-time 100 ns r ds(on) switch-on resistance v en =2.5v 0.9 i sw(off) sw leakage current v en =0v, v sw =0v, v in =52v 0.1 1 a v fb feedback voltage 4.5v v in 52v 0.778 0.794 0.81 v i fb(leak) feedback leakage current v fb =3v 0.1 a i en en input current v en =0v 0.1 a v en =52v 16 a v lh en high voltage threshold 4.5v v in 52v 2.3 v v hl en low voltage threshold 4.5v v in 52v 0.9 v protections v uvlo+ input supply turn on level uvlo+ 4.2 v v uvlo? input supply turn off level uvlo? 3.4 v i ocp over current protection threshold 1 a t shd thermal shutdown threshold otp 150 c t rec thermal recovery temperature 125 c note: 1. min output v oltage is restricted by minimum on-time, 100ns. 2. max output v oltage is restricted by maximum duty cycle and switch-on resistance.
rev. 1.11 5 august 12, 2016 HT7463A/ht7463b typical performance characteristics v in =18v, v out =12.5v, l=15/22h for HT7463A and l=33/47h for ht7463b, ta=25c, unless otherwise noted effciency vs. load (HT7463A, v out =12.5v) effciency vs. load (ht7463b, v out =12.5v) effciency vs. load (HT7463A, v out =5.7v) effciency vs. load (ht7463b, v out =5.7v) effciency vs. load (HT7463A, v out =3.3v) effciency vs. load (ht7463b, v out =3.3v) 12.340 12.390 12.440 12.490 12.540 12.590 12.640 1 5 10 50 80 125 200 300 400 500 600 output current (ma) vout (v) 15uh 22uh /rdg5hjxodwlrq+79 out =12.5v) 12.340 12.390 12.440 12.490 12.540 12.590 12.640 1 5 10 50 80 125 200 300 400 500 600 output current (ma) vout (v) 33uh 47uh /rdg5hjxodwlrq+7%9 out =12.5v)
rev. 1.11 6 august 12, 2016 HT7463A/ht7463b typical performance characteristics (continued) v in =18v, v out =12.5v, l=22h for HT7463A and l=47h for ht7463b, ta=25c, unless otherwise noted 5.560 5.610 5.660 5.710 5.760 5.810 5.860 1 5 10 50 80 125 200 300 400 500 600 output current (ma) vout (v) 15uh 22uh 5.560 5.610 5.660 5.710 5.760 5.810 5.860 1 5 10 50 80 125 200 300 400 500 600 output current (ma) vout (v) 33uh 47uh load regulation (HT7463A, v out =5.7v) load regulation (ht7463b, v out =5.7v) 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 1 5 10 50 80 125 200 300 400 500 600 output current (ma) vout (v) 15uh 22uh 3.260 3.270 3.280 3.290 3.300 3.310 3.320 3.330 1 5 10 50 80 125 200 300 400 500 600 output current (ma) vout (v) 33uh 47uh /rdg5hjxodwlrq+79 out =3.3v) load regulation (ht7463b, v out =3.3v) 12.480 12.485 12.490 12.495 12.500 12.505 12.510 12.515 14 18 24 36 vin (v) vout (v) 15uh 22uh 12.480 12.485 12.490 12.495 12.500 12.505 12.510 12.515 14 18 24 36 vin (v) vout (v) 33uh 47uh /lqh5hjxodwlrq+79 out =12.5v, i out =300ma) line regulation (ht7463b, v out =12.5v, i out =300ma) 5.695 5.696 5.697 5.698 5.699 5.700 5.701 5.702 5.703 5.704 5.705 8 12 18 24 vin (v) vout (v) 15uh 22uh 5.695 5.696 5.697 5.698 5.699 5.700 5.701 5.702 5.703 5.704 5.705 8 12 18 24 vin (v) vout (v) 33uh 47uh /lqh5hjxodwlrq+79 out =5.7v, i out =300ma) line regulation (ht7463b, v out =5.7v, i out =300ma)
rev. 1.11 7 august 12, 2016 HT7463A/ht7463b 3.305 3.306 3.307 3.308 3.309 3.310 3.311 3.312 3.313 3.314 3.315 8 12 18 24 vin (v) vout (v) 15uh 22uh 3.305 3.306 3.307 3.308 3.309 3.310 3.311 3.312 3.313 3.314 3.315 8 12 18 24 vin (v) vout (v) 33uh 47uh line regulation (HT7463A, v out =3.3v, i out =300ma) line regulation (ht7463b, v out =3.3v, i out =300ma) 0 0.2 0.4 0.6 0.8 1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 ven (v) current limit (a) HT7463A ht7463b 0 200 400 600 800 1000 1200 1400 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 vfb (v) frequency (khz) HT7463A ht7463b ,23v9(1+7dqg+7% f sw vs. vfb (HT7463A and ht7463b) 0 200 400 600 800 1000 1200 1400 1600 -40 -20 0 25 50 85 100 125 temperature ( ) ocp (ma) HT7463A ht7463b 0 200 400 600 800 1000 1200 1400 1600 -40 -20 0 25 50 85 100 125 temperature ( ) frequency (khz) HT7463A ht7463b ,23v7(03+7dqg+7% f sw vs. temp (HT7463A and ht7463b) 0.775 0.78 0.785 0.79 0.795 0.8 0.805 -40 -20 0 25 50 85 100 125 temperature ( ) vfb (v) HT7463A ht7463b 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -40 -20 0 25 50 85 100 125 temperature ( ) quiescent (ma) HT7463A ht7463b 9)%v7(03+7dqg+7% ,v7(03+7dqg+7%
rev. 1.11 8 august 12, 2016 HT7463A/ht7463b output ripple (HT7463A, i out =400ma) output ripple (ht7463b, i out =400ma) output ripple (HT7463A, i out =125ma) output ripple (ht7463b, i out =125ma) load transient (HT7463A, i out =50ma to 200ma) load transient (ht7463b, i out =50ma to 200ma) power up (HT7463A, v in =52v, i out =500ma) power up (ht7463b, v in =52v, i out =500ma)
rev. 1.11 9 august 12, 2016 HT7463A/ht7463b power down (HT7463A, v in =52v, i out =500ma) power down (ht7463b, v in =52v, i out =500ma) output short (HT7463A, i out =500ma) output short (ht7463b, i out =500ma) short recovery (HT7463A, i out =500ma) short recovery (ht7463b, i out =500ma) enable on (HT7463A, i out =500ma) enable on (ht7463b, i out =500ma)
rev. 1.11 10 august 12, 2016 HT7463A/ht7463b enable off (HT7463A, i out =500ma) enable off (ht7463b, i out =500ma) functional description output voltage setup the external resistor divider sets the output voltage , for details see the application circuit . the feedback resistor , r 1, a lso se ts t he f eedback l oop b andwidth with t he i nternal c ompensation c apacitor. r2 i s calculated using the following equation : r2=r1/((v out /0.794v)-1) ? protection features the devices include dedicated protection circuitry which is fully active during normal operation for full device protection. t he t hermal shut down circuitry t urns of f power to the device when the die temperature reaches excessive levels. the uvlo comparator protects the power device during supply power startup and shutdown to prevent operation at voltages less than the minimum input voltage. the HT7463A/b also features a shutdown mode decreasing the supply current to approximately 0.1a.
rev. 1.11 11 august 12, 2016 HT7463A/ht7463b recommended component values 0.1uf (optional) cb gnd fb sw vin en c b 0.1f v out l1 22h/47h * d1 c3 0.1f c4 22f r2 r1 c1 0.1f c2 100f on/off control v in 1 2 3 4 5 6 HT7463A/b c c note: * its recommended that l1=22h for HT7463A and l1=47h for ht7463b. v out (v) r1 (k?) r2 (k?) 3.3 51 (1%) 16 (1%) 5.0 82 (1%) 15 (1%) 12.5 91 (1%) 6.2 (1%)
rev. 1.11 12 august 12, 2016 HT7463A/ht7463b frequency fold-back function the devices i nclude a frequency fol d-back func tion to prevent situations of over current when the output is sh orted. i t e fficiently r educes overheating even i f the output is s horted. t his function is implemented by changing the switching frequency according the fe edback vol tage, v fb . w hen t he out put node is shorted, the device will reduce the frequency to 105khz for the HT7463A/ht7463b re spectively resulting i n a c lamped input c urrent. the HT7463A/ ht7463b operates at a frequency of 1250/550khz under nor mal c onditions a nd t he fe edback vo ltage i s about 0.794v . frequency fold-back 0 200 400 600 800 1000 1200 1400 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 vfb (v) frequency (khz) HT7463A ht7463b start-up function the device en pin in conjunction with a n rc flter is used to tailor the soft-start time to specifc application requirements . w hen a voltage applied to the en pin is be tween 0v a nd 2.3v , t he device wi ll c ause t he cycle-by-cycle current limit in the power stage to be modulated for a minimum current limit at 0v up to a the rate d curre nt li mit at 2.3v . thus , the output rise time and inrush current at startup are controlled. ven vs. current limit 0 0.2 0.4 0.6 0.8 1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 ven (v) current limit (a) HT7463A ht7463b component selection guide inductor use an inductor with a dc current rating at least 25% percent higher than the maximum load current for most applications. the dc resistance of the inductor is a key parameter affecting effciency. with regard to effciency, the inductor s dc resistance should be less than 200 m. for most application, the inductor value can be calculated from the following equation. sw ripple in outin out fiv vvv l ? = )( $ kljkhu ydoxh ri ulssoh fxuuhqw uhgxfhv wkh lqgxfwdqfh ydoxh exw lqfuhdv hv wkh frqgxfwdqfh orv v fruh orv v dqg fxuuhqw vwuhvv iru wkh lqgxfwru dqg vzlwfk ghylfhv $ v xjjhvw hg fkrlfh lv iru wkh lqgxfwru ulssoh fxuuhqw wr eh ri wkh pd[lpxp ordg fxuuhqw input capacitor a low esr ceramic capacitor (cin) is needed between the vin pin and gnd pin. use ceramic capacitors with x5r or x7r die lectrics for t heir l ow esrs and small temperature coeffcients. for most applications, a 2.2f- 10f capacitor will suffce. output capacitor the selec tion of cout is driven by the maximum al- lowable output voltage ripple. use ceramic capacitors with x5r or x7r dielectrics for their low esr characteristics. capacitors in the range of 22f to 100f are a good starting point with an esr of 0.1 or less. schottky diode the breakdown voltage rating of the diode should be higher t han t he m aximum i nput v oltage. the c urrent rating for the diode should be equal to the maximum output current to ensure the best reliability in most applications. in t his c ase i t is possi ble t o use a di ode with a lower average current rating , however the peak current rating shoul d be hi gher t han t he m aximum load current. bootstrap capacitor a 0 .1f c eramic c apacitor o r l arger i s r ecommended for the bootstrap capacitor . g enerally a 0.1f to 1f value can be used to ensure suffcient gate drive for the internal switches and a consistently low r dson .
rev. 1.11 13 august 12, 2016 HT7463A/ht7463b layout consideration guide t o reduce problems with conducted noise , there are some important points to consider regarding the pcb layout . ? ensure all feedback connections are short and direct. place the feedback resistors and compensation components as close to the fb pin as possible. ? the input bypass capacitor must be placed close to the vin pin. ? the inductor , schottky diode and output capacitor trace should be as short as possible to reduce conducted and radiated noise and increase overall effciency. ? keep the power ground connection as short and wide as possible. t hermal considerations the maximum pow er dis sipation depends on the thermal resistance of the ic packag e, the pcb layout, the rate of the surrounding airfow and the difference between the junction and ambient temperature. t he maximum power dissipation c an be calculated by the following formula: p d(max) = (t j(max) C t a ) / ja where t j(max) is the maximum junction temperature , t a is the ambient temperature and q ja is the junction- to-ambient thermal resistance of the ic package (220 o c/w for sot23-6) for maximum operating rating conditions, the maximum junction temperature is 150 o c. h owever, it is recommended that the maximum junction temperature does not exceed 125 o c in normal operation to maintain reliability. t he derating curve for maximum power dissipation is as follows: 25 50 75 100 125 150 0 0.1 0.2 0.3 0.4 0.5 0.6 0.568w 0 ambient temperature ( o c) maximum power dissipation (w)
rev. 1.11 14 august 12, 2016 HT7463A/ht7463b package information note that the package information provided here is for consultation purposes only . as this information may be updated at regular intervals users are reminded to consult the holtek website for the latest version of the package/ carton information . additional supplementary information with regard to packaging is liste d below . click on the relevant section to be transferred to the relevant website page. ? package information (include outline dimensions, product t ape and reel specifcations) ? the operation instruction of packing materials ? carton information
rev. 1.11 15 august 12, 2016 HT7463A/ht7463b sot23-6 outline dimensions h symbol dimensions in inch min. nom. max. a 0.057 a1 0.006 a2 0.035 0.045 0.051 b 0.012 0.020 c 0.003 0.009 d 0.114 bsc e 0.063 bsc e 0.037 bsc e1 0.075 bsc h 0.110 bsc l1 0.024 bsc 0 8 symbol dimensions in mm min. nom. max. a 1.45 a1 0.15 a2 0.90 1.15 1.30 b 0.30 0.50 c 0.08 0.22 d 2.90 bsc e 1.60 bsc e 0.95 bsc e1 1.90 bsc h 2.80 bsc l1 0.60 bsc 0 8
rev. 1.11 16 august 12, 2016 HT7463A/ht7463b copyright ? 2016 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek assumes no responsibility arising from the use of the specifcations described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek's products are not authorized for use as critical components in life support devices or systems. holtek reserves the right to alter its products without prior notifcation. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw.

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