The MAX1552 is a complete power-management chip for low-cost personal digital assistants (PDAs) and portable devices operating from a 1-cell lithium-ion (Li+), or 3-cell NiMH, battery. It includes all the regulators, outputs, and voltage monitors necessary for small PDAs while requiring a bare minimum of external components. This device features four linear regulators, a step-up DC-to-DC converter for LCD bias, a microprocessor reset output, and low battery detection in a miniature QFN package. For a compatible Li+ charger for both USB and AC adapter inputs, refer to the MAX1551*.