AME5252 Datasheet, PDF (1/18 Pages) Analog Microelectronics – Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter

AME
AME5252
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
n General Description
n Features
The AME5252 is a dual, constant frequency, synchro-
nous step down DC/DC converter. Intended for low power
applications, it operates from 2.5V to 5.5V input voltage
range and has a constant 1.5MHz switching frequency,
allowing the use of tiny, low cost capacitors and inductors
2mm or less in height. Each output voltage is adjustable
from 0.6V to 5V. Internal synchronous 0.35Ω, 1A power
switches provide high efficiency without the need for ex-
ternal Schottky diodes.
To further maximize battery life, the P-channel MOSFETs
are turned on continuously in dropout (100% duty cycle).
In shutdown model, the device draws <1µA.
n Applications
l PDAs/Palmtop PCs
l Digital Cameras
l Cellular Phones
l Portable Media Players
l PC Cards
l Wireless and DSL Modems
l High Efficiency: Up to 96%
l Internal soft start
l 1.5MHz Constant Frequency Operation
l High Switch Current: 1A on Each Channel
l No Schottky Diodes Required
l Low R_DSON Internal Switches: 0.35Ω
l Current Mode Operation for Excellent Line
and Load Transient Response
l Short-Circuit Protected
l Low Dropout Operation: 100% Duty Cycle
l Ultralow Shutdown Current: I_Q<1µA
l Output Voltages from 5V down to 0.6V
l Power-On Reset Output
l Externally Synchronizable Oscillator
l All AME’ s Lead Free Products Meet RoHS
Standards
n Typical Application
V IN
2.8V~5.5V
CIN
10µ F
V_OUT2 = 2.5V
L2
2.2µ H
CF2
22pF
R4
887KΩ
COUT 2
10µF
R3
280KΩ
C
EN2
IN
SYNC
EN1
PORB
AME5252
SW2
SW1
VFB2
VFB1
GND/PGND
R5
100KΩ
RESET
L1
2.2µ H
R2
887 KΩ
VOUT1 = 1.8V
S
CF1
22pF
R1
442 KΩ
C_{OUT 1}
10µF
Figure 1. 2.5V/1.8V at 600mA Step-Down Regulators
Rev.C.01
1