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AME5258 Datasheet(PDF) 1 Page - AMETHERM Circuit Protection Thermistors |
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AME5258 Datasheet(HTML) 1 Page - AMETHERM Circuit Protection Thermistors |
1 / 17 page AME 1 AME5258 1.5MHz, 600mA Synchronous Buck Converter Rev.A.05 The AME5258 is a high efficiency monolithic synchro- nous 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 300 µA and drops to <1 µA in shutdown. The 2.5V to 5.5V input voltage range makes the AME5258 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 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, 2.2 µH inductor.Low output voltages are easily supported with the 0.6V feed- back reference voltage. And 100% duty cycle when Vin approaches Vout. n General Description n Typical Application Figure 1: High Efficiency Step-Down Conventer n Features l High Efficiency: Up to 96% l 600mA Output Current at V IN=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<1 µA 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 n Applications l Cellular Phones l Digital Cameras l Portable Electronics l USB Devices l MP3 Players l LDO Replacement Figure 2: 1.8V at 600mA Step-Down Requlator Fixed Output Voltage 2.2 µH CIN 4.7 µF CER AME5258 IN SW OUT EN GND COUT 10 µF CER VIN VOUT Adjustable Output Voltage 2.2 µH CIN 4.7 µF CER AME5258 IN SW FB EN GND COUT 10 µF CER VIN 1.8V 600mA VOUT=VFB (R1+R2)/R2 22pF R1 R2 VIN = 2.5V to 5.5V 887K 442K VOUT |
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