AME5248A Datasheet, PDF (1/20 Pages) Analog Microelectronics – 1.5MHz, 600mA Synchronous Buck Converter

AME
AME5248A
1.5MHz, 600mA
Synchronous Buck Converter
n General Description
The AME5248A is a fixed-frequency current mode syn-
chronous PWM step down converter that is capable of
delivering 600mA output current while achieving peak effi-
ciency of 95%. Under light load conditions, the AME5248A
operates in a power saving mode that consumes just
around 20µA of supply current, maximizing battery life in
portable applications. The AME5248A operates with a
fixed frequency of 1.5MHz, minimizing noise in noise-
sensitive applications and allowing the use of small ex-
ternal components. The AME5248A is an ideal solution
for applications powered by Li-Ion batteries or other por-
table applications that require small board space.
The AME5248A is available in a variety of fixed output
voltage options, 1.0V, 1.2V, 1.3V, 1.5V, 1.8V, 2.5V, 2.7V,
2.8V, and 3.3V, and is also available in an adjustable
output voltage version capable of generating output volt-
ages from 0.5V to V_IN . The AME5248A is available in the
tiny 5-pin SOT-25 and TSOT-25 package.
n Features
l High Efficiency - Up to 95%
l Very Low 20µA Quiescent Current
l Guaranteed 600mA Output Current
l 1.5MHz Constant Frequency Operation PWM
l Internal Synchronous Rectifier Eliminates
Schottky Diode
l Adjustable Output Voltages From 0.5V to V_IN
l Fixed Output Voltage Options Available 1.0V,
1.2V, 1.3V, 1.5V, 1.8V, 2.5V, 2.7V, 2.8V and
3.3V
l 100% Duty Cycle Low-Dropout Operation
l 0.1µA Shutdown Current
l Require Tiny Capacitors and Inductor
l Tiny SOT-25 and TSOT-25 Package
l All AME's Lead Free Products Meet RoHS
Standards
n Applications
l Blue Tooth Headsets
l Portable Audio Players
l Mobile Phones
l Wireless and DSL Modems
l Digital Still Cameras
l Portable Instruments
n Typical Application
VIN
2.5V to 5.5V
C IN
4.7µF
IN
SW
AME5248A
L
4.7µH
EN
FB
GND
V_OUT
COUT
10µF
Figure 1. Fixed Voltage Regulator
VIN
2.5V to 5.5V
CIN
4.7µF
L
4.7µH
IN
SW
AME5248A ^C1
22pF
EN
FB
GND
V_OUT
1.8V/600mA
R1
470K
R2
180K
COUT
10µF
Figure 2. Adjustable Voltage Regulator
Rev.A.01
1