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AME5259A Datasheet(PDF) 1 Page - Analog Microelectronics |
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AME5259A Datasheet(HTML) 1 Page - Analog Microelectronics |
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1 / 21 page  AME 1 AME5259A Rev.A.02 1.2A, 1.5MHz Synchronous Step-Down Converter The AME5259A is a high efficiency monolithic synchro- nous buck regulator using a constant frequency, current mode architecture. Capable of delivering 1.2Aoutput cur- rent over a wide input voltage range from 2.5V to 5.5V. Supply current with no load is 400 µAand drops to<1µA in shutdown. The 2.5V to 5.5V input Voltage range makes the AME5259A ideally suited for single Li-Ion battery- 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 applica- tions. At very light load, the AME5259A will automati- cally skip pulses in pulse skip mode operation to main- tain output regulation. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The AME5259Ais available in small DFN-6D, QFN-16C and SOT-25 packages. Other features include soft start, lower internal refer- ence voltage with 2% accuracy, over temperature protec- tion, and over current protection. n General Description n Features n Applications n Typical Application l Cellular Telephones l Personal Information Applicances l Wireless and DSL Modems l MP3 Players l Portable Instruments l High Efficiency: Up to 95% l Shutdown Mode Draws < 1 µA Supply Current l 2.5V to 5.5V Input Range l Adjustable Output From 0.6V to V IN l 1.0V, 1.2V. 1.5V, 1.6V, 1.8V, 2.5V and 3.3V Fixed/Adjustable Output Voltage l 1.2A Output Current l Low dropout Operation: 100% Duty Cycle l No Schottky Diode Required l 1.5MHz Constant Frequency PWM Operation l Green Product Meet RoHS Standard 2.2 µH COUT 10 µF CER VIN VOUT Figure 1. Fixed Output Voltage High Efficiency Step -Down Conventer AME5259 A IN SW OUT EN GND 2.2 µH CIN 4.7 µF CER COUT 10 µF CER VIN 1.8V VOUT=VFB (R1+R2)/R2 R1 150K VIN = 2.5V to 5.5V VOUT AME5259 A IN SW FB EN GND R2 75K Figure 2. Adjustable Output Voltage 1.8V at 1000mA Step-Down Requlator CFWD: 22pF~220pF CIN 4.7 µF CER CFWD |
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