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AME5252

Description
Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter
File Size162KB,19 Pages
ManufacturerAnalogMicroElectronics,Inc.(AME)
AMT was founded in Taiwan in November 2000 and merged into AMT Microelectronics, Inc., a US company located in Silicon Valley, California, USA. Its stock was officially listed for public trading in March 2004.
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Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Converter

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AME
AME5252
n
General Description
Dual Synchronous, 600mA, 1.5MHz
Step-Down DC/DC Converter
n
Features
l
High Efficiency: Up to 96%
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Internal soft start
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1.5MHz Constant Frequency Operation
l
High Switch Current: 1A on Each Channel
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No Schottky Diodes Required
l
Low R
DSON
Internal Switches: 0.35Ω
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Current Mode Operation for Excellent Line
and Load Transient Response
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Short-Circuit Protected
l
Low Dropout Operation: 100% Duty Cycle
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Ultralow Shutdown Current: I
Q
<1µA
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Output Voltages from 5V down to 0.6V
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Power-On Reset Output
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Externally Synchronizable Oscillator
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All AME’ s Lead Free Products Meet RoHS
Standards
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.
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Applications
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PDAs/Palmtop PCs
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Digital Cameras
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Cellular Phones
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Portable Media Players
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PC Cards
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Wireless and DSL Modems
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Typical Application
V
IN
2.8V~5.5V
C
IN
10µF
C
EN2
SYNC
IN
EN1
PORB
R5
100KΩ
RESET
L1
2.2
µ
H
V
OUT2
= 2.5V
CF2
22pF
C
OUT 2
10
µ
F
L2
2.2
µ
H
SW2
R4
887KΩ
VFB2
R3
280KΩ
AME5252
SW1
V
OUT 1
= 1.8V
S
R2
887KΩ
CF1
22pF
C
OUT 1
10
µ
F
VFB1
R1
442KΩ
GND/PGND
Figure 1. 2.5V/1.8V at 600mA Step-Down Regulators
Rev.C.01
1
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