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AME5258

AME
Part Number AME5258
Manufacturer AME
Description 600mA Synchronous Buck Converter
Published Apr 17, 2009
Detailed Description www.datasheet4u.com AME AME5258 n General Description The AME5258 is a high efficiency monolithic synchronous buck regu...
Datasheet PDF File AME5258 PDF File

AME5258
AME5258

Overview
www.
datasheet4u.
com AME AME5258 n General Description The AME5258 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture.
The device is available in an adjustable version and fixed output voltages of 1.
2V, 1.
8V, 2.
5V and 3.
3V.
Supply current with no load is 300µA and drops to <1µA in shutdown.
The 2.
5V to 5.
5V input voltage range makes the AME5258 ideally suited for single Li-Ion battery-powered applications.
100% duty cycle provides low dropout operation, extending battery life in portable systems.
PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications.
At very light load, the AME5258 will automatically skip pulses in pulse skip mode operation to maintain output regulation.
The AME5258 is simple to use.
As with standard LDO's,Input and output capacitor are required.
The only other element is a small, low cost, 2.
2µH inductor.
Low output voltages are easily supported with the 0.
6V feedback reference voltage.
And 100% duty cycle when Vin approaches Vout.
1.
5MHz, 600mA Synchronous Buck Converter n Applications l Cellular Phones l Digital Cameras l Portable Electronics l USB Devices l MP3 Players l LDO Replacement n Typical Application Fixed Output Voltage 2.
2µH VIN C IN 4.
7µF CER IN SW VOUT AME5258 EN GND OUT C OUT 10µF CER n Features l High Efficiency: Up to 96% l 600mA Output Current at VIN=3V 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 Voltages l Shutdown Mode Draws<1µA Supply Current l Current Mode Operation for Excellent Line and Load Transient Response l Overtemperature Protection l Internal Soft Start l Space Saving 5-Pin SOT-25 Package l Meet RoHS Standards Figure 1: High Efficiency Step-Down Conventer Adjustable Output Voltage VIN = 2.
5V to 5.
5V VIN IN C IN 4.
7µF CER 2.
2µH SW 22pF FB GND R2 442K R1 887K VOUT 1.
8V ...


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