power&rf 3-26 2005 winter high current output positive ldo regulator ic with programmable current limit for usb usb p.c.l. Ci???` ic tk738xxb description the tk738xxb is a low dropout linear regulator with on/off control. the output voltage, trimmed with high accuracy, is available from 1.5 to 5.0v. tk738xxb ` on/off ?`????` ic ??R??????????? 1.5v 5.0v gO?? features ? high precision output voltage ? ???R ? superior phase compensation to previous model ? a?? ? very good stability: ceramic capacitor can be used. ? ? : ????? ? very low dropout voltage: v drop =170mv at i out =500ma ? ??g?R : v drop =170mv at i out =500ma ? active high on/off control ? on/off ?` : high-on ? short circuit protection (over current protection) ? ?joC ( ^o ) ? thermal shutdown (over heat protection) ? `????C ( ^?o ) ? reverse bias protection ? ^?C ? battery backup ? ??`???C ? programmable current limit ? ?C ? adjustable output voltage ? ?R?OC applications ? power supplies for low-voltage mpu and its peripheral equipment ? ?R mpu ??xC ? battery powered mobile communication systems ? ??`l?C ? pda, game machine ? pda `C ? audio systems ? `?C ? li-ion battery charge from usb port ? usb U?? li-ion ??` package outline ordering information part name package marking pin configuration ordering information tk738xxb fc-9 axx see next page 7 t k x 3 8 x b t package code storage direction b:flip chip tb: back type b voltage code ex . 2.5v: 25 , 5.0v : 50 * ?xx? means voltage code. ?xx? ?R`???? absolute maximum ratings parameter ? symbol ? rating unit g remarks q operating voltage range ?R v op 2.4 ~ 13 v operating temperature range ?? t op -40 to +85 c power dissipation SM p d 1300 *1 mw board mount g?r
power&rf 2005 winter 3-27 electrical charcteristics v in =v ou t.typ +1v, v co nt =1.8v, t a =25 q c value parameter 5?" symbol .% min typ max units
? conditions ?
? dropout voltage i
4f5?4?
v drop 170 270 mv i out =500ma quiescent current 5 .5 y i q 310 480 p a i out =0ma maximum output current "
5 y i ou t.max 0.8 1 a when vout down 10% ( vout ? 10%
?t? ) standby current ,2fc5 y i stb 0.0 0.1 p a v cont =0v control current &f;`o^5 y i cont 58 p a v cont =1.8v v cont 1.8 v v out on state control voltage &f;`o^5? 0.6 v out off state block diagram control circuit bandgap reference over heat protection disconnect circuit b1 v out v in 1 p f p.c.l. on control 1 p f r pcl v out v sense b3 gnd c2 a2 c1 a1 c3 a3 v fb b in v in b1 c1 c2 c3 b3 b2 p.c.l. v fb n.c. gnd a2 a3 a1 control b in v in v out v sense top view
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