1/3 rev. b structure silicon monolithi c integrated circuit product name 1ch dc dc pwm converter ic built in synchronous rectifier type BD89630EFJ features ? output voltage adjustable(1.0 2.5 ), output current 2.0a ? high efficiency and fast transient response absolute maximum rating ta = 2 5 parameter symbol limit unit power supply voltage v cc -0.3 +7 * 1 v en voltage v en -0.3 +7 v sw ? comp voltage v sw , v comp -0.3 +7 v power dissipation 1 pd1 0.5 * 2 w power dissipation 2 pd2 3.76 * 3 w operating temperature range topr -25 +85 storage temperature range tstg -55 +150 maximum junction temperature tjmax +150 * 1 pd, aso and tjmax=150 should not be exceeded. * 2 reduced by 4.0mw for increase in ta of 1 above 25 . * 3 reduced by 30.0mw for increase in ta of 1 above 25 . (when mounted on a board 70.0mm 70.0mm 1.6mm glass-epoxy pcb) operating conditions ta = - 2 5 +85 parameter symbol min. typ. max. unit power supply voltage v cc 2.7 5.0 5.5 v en voltage v en 0 - vcc v output voltage range v out 1.0 - 2.5* 4 v sw average output current i sw - - 2.0* 5 a * 4 in case set output voltage 1.6v or more, vccmin. = vout +1.8v * 5 pd should not be exceeded. this product is not designed for pr otection against radioactive rays.
2/3 rev. b electrical characteristics (unless otherwise specified , ta=25 v cc =5v, en=v cc , r 1 =30k , r 2 =7.5k ) parameter symbol limit unit condition min. typ. max. standby current i stb - 5 20 a en=gnd bias current i cc - 350 600 a en low voltage v enl - gnd 0.3 v stand-by mode en high voltage v enh 2.0 v cc - v active mode en current i en - 1.25 10 a v en =5v oscillation frequency f osc 0.8 1 1.2 mhz pch fet on resistance r onp - 145 290 m v cc =5v nch fet on resistance r onn - 80 160 m v cc =5v adj reference voltage v adj 0.788 0.800 0.812 v comp s ink current i cosi 10 25 - a v adj =1.0v comp source current i coso 10 25 - a v adj =0.6v uvlo threshold voltage v uvlo 1 2.400 2.500 2.600 v vcc=5v 0v uvlo hysteresis voltage v uvlo 2 2.425 2.550 2.700 v vcc=0v 5v soft start time t ss 0.5 1 2 ms timer latch time t latch 1 2 4 ms output short circuit threshold voltage v scp - v out 0.5 v out 0.7 v v out =1.0v 0v physical dimension block diagram ? application circuit setting the output voltage pin no., pin name pin no. pin name 1 comp 2 gnd 3 en 4 v cc 5 sw 6 sw 7 n.c 8 adj 6 8 sw adj r2 r1 l htsop-j8 (unit:mm) the output voltage is set by the external resistor divider and is calculated as vout=(r2/r1+1) vadj ??? v adj adj pin reference voltage (0.8v typ) it? s possible to adjust the output voltage by r1 and r2. (the vout must be set from 1.0v to 2.5v.) resistance r1 P 10k is recommended. please confirm the ripple voltage, if you can use the resistance more than 100k . vout tsd output input v cc sw gm amp r s q osc uvlo + v cc clk slope current comp 4 5 2 soft start current sense/ protect + driver logic + vref comp a dj 1 8 scp 6 3 v cc en gnd lot no. d89630
3/3 rev. b notes for use (1) absolute maximum ratings we are careful enough for quality control about this ic. so, t here is no problem under normal operation, excluding that it exceeds the absolute maximum ratings. however, this ic mi ght be destroyed when the absolute maximum ratings, such as impressed voltages or the operating temperature range, is exceeded, and whether the destruction is short circuit mode or open circuit mode cannot be specified. pleases take into co nsideration the physical countermeasures for safety, such as fusing, if a particular mode that exc eeds the absolute maximum rating is assumed. (2) gnd potential make setting of the potential of the gnd terminal so that it will be maintained at the minimum in any operating state. furthermore, check to be sure no terminals are at a potential lower than the gnd voltage except for sw, gnd terminals including an actual electric transient. (3) thermal design do not exceed the power dissipation (pd) of the packa ge specification rating under actual operation, and please design enough temperature margins. (4) short circuit mode between terminals and wrong mounting in order to mount the ic on a set pcb, pay thorough attention to the direction and offset of the ics. erroneous mounting can destroy the ic. furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and th e power supply or the gnd terminal, the ic can destroy (5) operation in strong electromagnetic field be noted that using the ic in the strong electr omagnetic radiation can cause operation failures. (6) aso(area of safety operation.) do not exceed the maximum aso and the absolu te maximum ratings of the output driver. (7) tsd(thermal shut-down) circuit the thermal shutdown circuit (tsd circuit) is built in this product. when ic chip temperature becomes higher, the thermal shutdown circuit operates and turns output off. the guarantee and protection of ic are not purpose. therefore, pleas e do not use this ic after tsd circuit operates, nor use it for assumption that operates the tsd circuit. (8) gnd wiring pattern use separate ground lines for control signals and high current power driver outputs. because these high current outputs that flows to the wire impedance ch anges the gnd voltage for c ontrol signal. therefore, each ground terminal of ic must be connected at the one point on the set circuit board. as for gnd of external parts, it is similar to the above-mentioned. (9) operation in supply voltage range functional circuit operation is guaranteed within operation ambient temperat ure, as long as it is within operation supply voltage range. the electrical characteristics standard value cannot be guaranteed. however, there is no drastic variation in these values, as long as it is within operation supply voltage range. (10) we are confident in recommendin g the above application circuit exampl e, but we ask that you carefully check the characteristics of this circuit before using i t. if using this circuit afte r modifying other external circuit constants, be careful to ensure adequate margin s for variation between external devices and this ic, including not only static characteristics but also trans ient characteristics. if swit ching noise is high, please insert the schottky barrier diodes between sw pin and gnd pin. (11) overcurrent protection circuit the overcurrent protection circuit is built in the output. if the protecti on circuit operates more than for specific hours (when the load is short.), the output will be latched in off. the output returns when en is turned on or uvlo is released again. these protection circuits are effe ctive in the destruction prevention by broken accident. please do not use in continuous circuit operation. (12) selection of inductor it is recommended to use an inductor with a series resistance element (dcr) 0.1 or less. especially, in case output voltage is set 1.6v or more, note that us e of a high dcr inductor will cause an inductor loss, resulting in decreased output voltage. should this condit ion continue for a specified period (soft start time + timer latch time), output short circuit protection wi ll be activated and output will be latched off. when using an inductor over 0.1 , be careful to ensure adequate margins for variation between external devices and this ic, including transient as well as static charac teristics. furthermore, in any case, please start up the output with en after supply vo ltage is within operation range(2.7 5.5v).
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