The MAX1774EEI+ is a dual high efficiency, step-down converter with backup battery switchover in 28 pin QSOP package. It integrates two high efficiency step-down converters, a boost converter for backup battery regulation and four voltage detectors. It 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 main and core regulators have separate shutdown inputs. When the AC adapter power is removed, an external P channel MOSFET switches input to main battery. When main battery is low, the backup step-up converter sustains main output voltage. When backup battery can no longer deliver required load, system shuts down safely to prevent damage. Four onboard voltage detectors monitor status of the AC adapter power, main battery and backup battery. It is used in internet access tablets, POS terminals, subnotebooks and PDAs.
- Input voltage range from +2.7V to +28V
- Operating temperature range from -40°C to 85°C
- Main power, adjustable from +1.25V to +5.5V, over 2A load current & up to 95% efficiency
- Core power, adjustable from 1V to 5V, internal switches & up to 91% efficiency
- Automatic main battery switchover, 100% (max) duty cycle
- Up to 1.25MHz switching frequency
- Quiescent current is 170μA
- Shutdown current is 8μA
- Digital soft start
- Independent shutdown inputs
电源管理, 工业, 便携式器材
(EN)
