19-1810; Rev 2; 12/03
EVAALVUAAILTAIOBNLEKIT
Dual, High-Efficiency, Step-Down
Converter with Backup Battery Switchover
MAX1774
General Description
The MAX1774 is a complete power-supply solution for PDAs and other hand-held devices.
It integrates two high-efficiency step-down converters, a boost converter for backup battery regulation, and four
voltage detectors in a small 32-pin QFN or 28-pin QSOP package.
The MAX1774 accepts inputs from +2.
7V to +28V and provides an adjustable main output from 1.
25V to 5.
5V at over 2A.
The secondary core converter delivers an adjustable
voltage from 1V to 5V and can deliver up to 1.
5A.
Both the main and core regulators have separate shutdown inputs.
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