The AME5258 is a high efficiency monolithic synchronousbuck regulator using a constant frequency, currentmode architecture. The device is available in an adjustableversion and fixed output voltages of 1.2V, 1.8V, 2.5V and3.3V. Supply current with no load is 300μA and drops to<1μA in shutdown. The 2.5V to 5.5V input voltage rangemakes the AME5258 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides lowdropout operation, extending battery life in portablesystems. PWM pulse skipping mode operation providesvery low output ripple voltage for noise sensitiveapplications. At very light load, the AME5258 will automaticallyskip pulses in pulse skip mode operation tomaintain output regulation.The AME5258 is simple to use. As with standard LDO's,Input and output capacitor are required. The only other elementis a small, low cost, 2.2μH inductor.Low outputvoltages are easily supported with the 0.6V feedback referencevoltage. And 100% duty cycle when Vin approachesVout.
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