AME
AME5248A
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.
1.5MHz, 600mA
Synchronous Buck Converter
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Applications
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Blue Tooth Headsets
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Portable Audio Players
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Mobile Phones
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Wireless and DSL Modems
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Digital Still Cameras
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Portable Instruments
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Typical Application
V
IN
2.5V to 5.5V
IN
C
IN
4.7µF
SW
L
4.7µH
V
OUT
AME5248A
EN
GND
FB
C
OUT
10µF
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Features
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High Efficiency - Up to 95%
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Very Low 20µA Quiescent Current
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Guaranteed 600mA Output Current
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1.5MHz Constant Frequency Operation PWM
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Internal Synchronous Rectifier Eliminates
Schottky Diode
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Adjustable Output Voltages From 0.5V to V
IN
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Fixed Output Voltage Options Available 1.0V,
1.2V, 1.3V, 1.5V, 1.8V, 2.5V, 2.7V, 2.8V and
3.3V
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100% Duty Cycle Low-Dropout Operation
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0.1µA Shutdown Current
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Require Tiny Capacitors and Inductor
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Tiny SOT-25 and TSOT-25 Package
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All AME's Lead Free Products Meet RoHS
Standards
V
IN
2.5V to 5.5V
IN
C
IN
4.7µF
SW
C1
22pF
R1
470K
R2
180K
C
OUT
10µF
L
4.7µH
V
OUT
1.8V/600mA
Figure 1. Fixed Voltage Regulator
AME5248A
EN
GND
FB
Figure 2. Adjustable Voltage Regulator
Rev.A.01
1
AME [ ANALOG MICROELECTRONICS ]
