ACE723A 3 a 1.5mhz 5.5v synchronous buck converter ver 1. 3 1 d escription the ACE723A is a high efficiency synchronous, buck dc/dc converter. its input voltage range is from 2 .6v to 6 v and provides an adjustable regulated output voltage from 0.8v to 5.5v while delivering up to 3a of output current. the internal sync hronous switches efficiency and eliminate the need for an external schottky diode. the switching frequency is set by an external resistor or can be synchronized to an external clock. the 100% duty cycle provides low dropout operation extending battery life in portable systems. the ACE723A is operated in pfm/ pwm auto - switch mode which enhance the efficiency at light - load . features ? adjustable output voltage, vfb=0.8v ? maximum o utput c urrent is 3a ? range of operation input voltage: max 6 v ? standby current: 0.5m a (typ.) ? line regulation: 0.1%/v (typ.) ? load regulation: 10mv (typ.) ? high efficiency, up to 96% ? environment temperature: - 2 0 o c ~85 o c application ? power management for 3g modem ? 3w led driver from li - ion battery ? lcd monitor and lcd tv ? dvd decode board ? adsl modem ? post regulators for switching supplies typical application ACE723A
ACE723A 3 a 1.5mhz 5.5v synchronous buck converter ver 1. 3 2 absolute maximum ratings p arameter s ymbol m ax u nit input voltage v in 6 v operating junction temperature t j 125 o c ambient temperature t a - 2 0 ~ 85 o c package thermal resistance dfn 2*2 - 8 25 o c /w storage temperature t s - 40 ~ 150 o c esd (hbm) >2000 v note: exceed these limits to damage to the device. exposure to absolute maximum rating conditions may affect device reliabili ty. pack aging type dfn 2 * 2 - 8 dfn3*3 - 10 en comp gnd fb lx vdd pgnd pvdd ordering information ACE723A xx + h re commended work conditions item min max unit input voltage range 6 v operating junction temperature (t j ) - 20 +125 dn : dfn2*2 - 8 on: dfn3*3 - 10 pb - free halogen - free 1 8 2 7 3 6 4 5 en 1 10 comp gnd 2 9 fb lx 3 8 vdd l x 4 7 pvdd prnd 5 6 pvdd
ACE723A 3 a 1.5mhz 5.5v synchronous buck converter ver 1. 3 3 electrical characteristics ( v dd =5v,t a =25 ) parameter symbol conditions min typ max units input voltage range v dd 2 .6 5.5 v feedback voltage vref 0.784 0.8 0.816 v feedback leakage current ifb 0.1 0.4 ua quiescent current iq active, vfb=0.7 8, no switching 450 ua shutdown 1 ua line regulation lnreg vin=4v to 5.5v 0.1 %/v load regulation ldreg iout=1 to 3a 0.02 %/a ea transconductance gm 600 u s switching f requency fsoc ren =180k 1.35 mhz pmos rdson rdsonp 150 nmos r dson rdsonn 130 peak current limit llimit 3.8 a en shutdown voltage ven vin - 0.7v vin typical performance characteristics efficiency vs. output current load regulation (vout=1.0v) (vout=1.0v) output current (ma) output current (ma)
ACE723A 3 a 1.5mhz 5.5v synchronous buck converter ver 1. 3 4 efficiency vs. output current load regulation (vout= 3.3 v) (vout= 3.3 v) output current (ma) output current (ma) quiescent current vs. input voltage current limit vs. input voltage input voltage ( v ) inp ut voltage ( v ) frequency vs. temperature output voltage vs. temperature ( v i n = 5 v ) ( v i n = 5 v ) temperature ( ) temperature ( )
ACE723A 3 a 1.5mhz 5.5v synchronous buck converter ver 1. 3 5 power on & soft start load transient response detailed description ACE723A is a 3a synchronous buck, with frequency adjusted by ren_. it can achieve conversion efficiency up to 95%. it also support 100% duty cycle which will maximize the battery usage. only a inductor and a few r & c need for peripheral. the pcb size can be very small please note that en_ pin has to be pull high if one wants to shutdown the chip. and release it (with a ren_ connected to gnd) to have it work. one can also switch off ACE723A by connect enabl e signal with at least 1ma driving capability to vdd pin (pin 6 of dfn2x2 and pin 8 of dfn3x3 package).
ACE723A 3 a 1.5mhz 5.5v synchronous buck converter ver 1. 3 6 packing information dfn 2*2 - 8 top view bottom view pin 1 dot by marking pin #1 identification chamfer side view common dimensions (mm) pkg. w:very very thin ref. min. nom. max. a 0.70 0.75 0.80 a1 0.00 - 0.05 a3 0.2 ref. d 1.95 2.00 2.05 e 1.95 2.00 2.05 b 0.18 0.23 0.30 l 0.25 0.35 0.45 d2 1.05 1.20 1.30 e2 0.45 0.60 0.70 e 0.50 bsc
ACE723A 3 a 1.5mhz 5.5v synchronous buck converter ver 1. 3 7 packing information dfn3*3 - 10 sy m b o l d i m e n s i o n s i n m i l l i m e t e r s min. max. a 0 . 7 0 0 0 . 8 0 0 a 1 0 . 0 0 0 0 . 0 5 0 a 3 0 . 1 7 5 0 . 2 5 0 b 0 . 1 8 0 0 . 3 0 0 d 2 . 9 5 0 3 . 0 5 0 d 2 2 . 3 0 0 2 . 6 5 0 e 2 . 9 5 0 3 . 0 5 0 e 2 1 . 5 0 0 1 . 7 5 0 e 0 . 5 0 0 l 0 . 3 5 0 0 . 4 5 0
ACE723A 3 a 1.5mhz 5.5v synchronous buck converter ver 1. 3 8 notes ace does not assume an y responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ace electronics co., ltd. as sued herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a signifi cant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. a ce technology co., ltd. http://www.ace - ele.com/
|
