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LDOs extend battery life in low power handheld product designs

December 15, 2010 | Paul Buckley | 222901957
Diodes Incorporated has introduced the 150 mA AP7312 and 300 mA AP7332 linear regulators. Characterized by low dropout voltage and low quiescent current, the linear regulators suit low power handheld product design where extending battery life is a key design criteria.

Target applications include smart phones, tablets, multimedia players and wireless headsets. Dual fixed output devices, the AP7312 and AP7332 exhibit dropouts of 150 mV and 300 mV respectively, with typical quiescent current ratings of only 60 μA.     

To enable full use of battery capacity down to 2 V and to provide additional headroom for 5 V sources, the low dropout regulators' input voltage spectrum is wide, at 2 V to a maximum of 6 V. The dual output devices provide designers with an extensive choice of 13 different fixed output voltage combinations, from  1.0 V/1.0 V through to 3.3 V/3.3 V.     

Integrating current limit, short circuit and thermal shutdown protection, the regulators do much to extend overall system reliability. MCU-based circuit design and space requirements are also reduced, with the regulators delivering two regulated output voltages for core and I/O from the single SOT26 or DFN2018-6 package.     

The regulators' ripple rejection of 65 dB at 1 kHz minimizes supply current ripple in the face of changes in input voltage or load and their transient response enhance overall system response. Device start-up time is fast at 60 μs and outputs highly stable using just 1 μF low ESR ceramic output capacitors.     

Further information is available at

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