AME5249A Datasheet, PDF (1/21 Pages) Analog Microelectronics – 1.5MHz, 600mA Synchronous Buck Converter

AME
AME5249A
n General Description
The AME5249A 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 AME5249A
operates in a power saving mode that consumes just
around 20µA of supply current, maximizing battery life in
portable applications. The AME5249A operates with a
fixed frequency of 1.5MHz, minimizing noise in noise-
sensitive applications and allowing the use of small ex-
ternal components. The AME5249A is an ideal solution
for applications powered by Li-Ion batteries or other por-
table applications that require small board space.
The AME5249A 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 V_IN . The AME5249A 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 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
1.5MHz, 600mA
Synchronous Buck Converter
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
V_IN
2.5V to 5.5V
C IN
4.7µF
IN
SW
AME5249A
L
4.7µH
EN
OUT
GND
V_OUT
COUT
10µF
Figure 1. Fixed Voltage Regulator
V_IN
2.5V to 5 .5V
C_IN
4.7µF
IN
SW
AME5249A
EN
FB
GND
L
4.7 µH
C1
22pF
V_OUT
1.8V/600mA
R1
887K
R2
442K
C_OUT
10 µ F
Figure 2. Adjustable Voltage Regulator
Rev.A.01
1