Dual-output LDOs

2 February 2011 Power Electronics / Power Management

Characterised by low dropout voltage and low quiescent current, the latest linear regulators from Diodes Incorporated suit low-power handheld product design where extending battery life is a key design criteria.

The 150 mA AP7312 and 300 mA AP7332 exhibit respective dropouts of 150 mV and 300 mV and 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 (LDO) regulators’ input voltage spectrum is wide, at 2 V to a maximum of 6 V. The dual-output devices provide a 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 LDOs delivering two regulated output voltages for core and I/O from the single SOT26 or DFN2018-6 package. Their ripple rejection of 65 dB at 1 kHz minimises supply current ripple in the face of changes in input voltage or load and their excellent transient response enhances overall system response. Device startup time is 60 μs and outputs are highly stable using just 1 μF low-ESR ceramic output capacitors.

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