ame5258a AME, Inc., ame5258a Datasheet
ame5258a
Manufacturer Part Number
ame5258a
Description
Synchronous Buck Converter
Manufacturer
AME, Inc.
Datasheet
1.AME5258A.pdf
(17 pages)
AME5258A
Rev.A.01
n General Description
nous buck regulator using a constant frequency, current
mode architecture. The device is available in an adjustable
version. Supply current with no load is 300 A and drops to
<1 A in shutdown. The 2.5V to 5.5V input voltage range
makes the AME5258A ideally suited for single Li-Ion bat-
tery-powered applications. 100% duty cycle provides low
dropout operation, extending battery life in portable sys-
tems. PWM pulse skipping mode operation provides very
low output ripple voltage for noise sensitive applications.
At very light load, the AME5258A will automatically skip
pulses in pulse skip mode operation to maintain output
regulation.
LDO's,Input and output capacitor are required. The only
other element is a small, low cost, 2.2 H inductor.Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. And 100% duty cycle when Vin
approaches Vout.
n Features
The AME5258A is a high efficiency monolithic synchro-
The AME5258A is simple to use. As with standard
l High Efficiency: Up to 96%
l 800mA Output Current at V
l 2.5V to 5.5V Input Voltage Range
l 1.5MHz Constant Frequency Operation
l No Schottky Diode Required
l Low Dropout Operation: 100% Duty Cycle
l 0.6V Reference Allows Low Output
l Shutdown Mode Draws<1 A Supply
l Current Mode Operation for Excellent
l Overtemperature Protection
l Internal Soft Start
l Space Saving 5-Pin SOT-25 Package
l Meet RoHS Standards
AME
Voltages
Current
Line and Load Transient Response
IN
=3V
Synchronous Buck Converter
V
V
IN
4.7 F
IN
CER
C
= 2.5V to 5.5V
Figure 1: 1.8V at 800mA Step-Down Requlator
n Typical Application
n Applications
IN
l Cellular Phones
l Digital Cameras
l Portable Electronics
l USB Devices
l MP3 Players
l LDO Replacement
Adjustable Output Voltage
V
IN
EN
OUT
AME5258A
=V
GND
FB
(R1+R2)/R2
1.5MHz, 800mA
SW
FB
2.2 H
22pF
887K
442K
R1
R2
10 F
C
CER
V
1.8V
800mA
OUT
1
OUT
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