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Integrated power management IC optimized for portable apps

Milpitas, CA — Linear Technology Corporation announces the LTC3456, a complete power management system IC optimized for portable applications powered by dual cell alkaline/NiCad/NiMH batteries, USB, or wall adapter. The LTC3456 delivers up to 150mA to a fixed 3.3V Main output and up to 200mA to an adjustable (VBATT to 0.8V) Core output to power microprocessors, microcontrollers and their peripheral circuitry. In addition, the LTC3456 provides a 3.3V 50mA Hot Swap output for flash memory cards and an always-alive VMAX to power a real-time clock. The LTC3456 is available in a tiny low profile (4mm x 4mm x 0.75mm) 24-pin QFN package making it ideal for space-sensitive packaged portable devices.

The LTC3456 has onboard voltage detectors to monitor the status of the wall adapter and USB voltages, as well as a unique control scheme, ensuring seamless transition between battery, USB and wall adapter input power sources. Integrated power sequencing ensures that the Main and Hot Swap outputs always come up after the Core output. The Main and Core 1MHz switching regulators employ synchronous rectification to deliver efficiencies over 90%. The LTC3456 has a low battery indicator and a feature to ensure that all outputs are discharged to ground in shut down mode.

Summary of LTC3456 Features:
Seamless Transition between 2-Cell Battery, USB and AC Wall Adapter Input Power Sources
Main Output: Fixed 3.3V Output
Core Output: Adjustable from 0.8V to VBATT(MIN)
Hot Swap Output for Memory Cards
Outputs Discharged to Ground During Shutdown
Power Supply Sequencing: Main and Hot Swap Outputs Come Up After Core Output
Accurate 100mA/500mA USB Current Limiting
High Frequency Operation: 1MHz
High Efficiency: Up to 92%
Small (4mm x 4mm x 0.75mm) 24-Pin QFN Package

The LTC3456 packaged in a 4mm x 4mm QFN-14, is available from stock. Pricing starts at $3.95 each for 1,000 quantities.

Call toll-free 1-800-4-LINEAR (for literature only), or go to the company's web site:www.linear.com.

3456 data sheet

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