AME5249 Datasheet, PDF (1/21 Pages) Analog Microelectronics – 1.5MHz, 600mA Synchronous Buck Converter

AME
AME5249
n General Description
The AME5249 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 AME5249
operates in a power saving mode that consumes just
around 20µA of supply current, maximizing battery life in
portable applications. The AME5249 operates with a fixed
frequency of 1.5MHz, minimizing noise in noise-sensi-
tive applications and allowing the use of small external
components. The AME5249 is an ideal solution for appli-
cations powered by Li-Ion batteries or other portable ap-
plications that require small board space.
The AME5249 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 AME5249 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
AME5249
L
4.7 µH
EN
FB
GND
VOUT
COUT
10µF
Figure 1. Fixed Voltage Regulator
V_IN
2.5V to 5.5V
C_IN
4 .7µF
L
4 .7^{µ H}
IN
SW
AME5249
C1
22p F
EN
FB
GND
V_OUT
1.8V/ 600mA
R1
887 K
R2
442 K
C_OUT
10 µ F
Figure2. Adjustable Voltage Regulator
Rev.A.01
1