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AME5248 Datasheet, PDF (1/21 Pages) Analog Microelectronics – 1.5MHz, 600mA Synchronous Buck Converter
AME
AME5248
1.5MHz, 600mA
Synchronous Buck Converter
n General Description
The AME5248 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 AME5248
operates in a power saving mode that consumes just
around 20µA of supply current, maximizing battery life in
portable applications. The AME5248 operates with a fixed
frequency of 1.5MHz, minimizing noise in noise-sensi-
tive applications and allowing the use of small external
components. The AME5248 is an ideal solution for appli-
cations powered by Li-Ion batteries or other portable ap-
plications that require small board space.
The AME5248 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 0.6V to VIN . The AME5248 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 0.6V to VIN
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
CIN
4.7µF
IN
SW
AME5248
L
4.7µH
EN
FB
GND
VOUT
COUT
10µF
Figure 1. Fixed Voltage Regulator
VIN
2.5V to 5.5V
CIN
4 .7µF
IN
SW
AME5248
EN
FB
GND
L
4 .7µ H
C1
22p F
VOUT
1.8V/ 600mA
R1
887 K
R2
442 K
COUT
10 µ F
Figure2. Adjustable Voltage Regulator
Rev.A.01
1
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