Dual-Output Step-Down and LCD Step-Up Power Supply for PDAs
DescriptionThe MAX1878 dual power supply contains a step-down and step-up DC-DC converter in a small 12-pin TQFN package for use in PDAs. The step-down DC-DC converter delivers over 500mA to an output as low as 1.25V for logic power. The step-up DC-DC converter delivers over 15mA and an output as high as 28V for a liquid crystal display (LCD). With an input voltage from 2.0V to 5.5V the MAX1878 is intended for use in systems powered by a 2-cell alkaline or 1-cell lithium-ion (Li+) battery.
Fast switching frequency allows the use of small inductors and capacitors, and the low 19µA typical quiescent current allows high efficiency when the system is in standby mode. Each output can be independently enabled.
The MAX1878 is available in a small 0.75mm high 4mm x 4mm 12-pin TQFN package and requires no external FETs. The MAX1878 evaluation kit is available to speed designs.
- Evaluation Kit Available to Speed Designs
- Two Output Voltages
- Main Output: 1.25V to VIN
- LCD Output: Up to 28V
- 2.0V to 5.5V Input Range
- Low 19µA Quiescent Supply Current
- 1µA Shutdown Supply Current
- High Switching Frequency for Small External Components
- Small 0.75mm High 4mm x 4mm 12-Pin TQFN Package
- GPS Receivers
- MP3 Players
- Personal Digital Assistants (PDAs)
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