LT LTC4412ES6#TRMPBF

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Overview

■ Very Low Loss Replacement for Power Supply

APPLICATIONS ■ Cellular Phones ■ Notebook and Handheld Computers ■ Digital Cameras ■ USB-Powered Peripherals ■ Uninterruptable Power Supplies ■ Logic Controlled Power Switch DESCRIPTION The LTC® 4412 controls an external P-channel MOSFET to create a near ideal diode function for power switchover or load sharing. This permits highly efficient OR’ing of multiple power sources for extended battery life and low selfheating. When conducting, the voltage drop across the MOSFET is typically 20mV. For applications with a wall adapter or other auxiliary power source, the load is automatically disconnected from the battery when the auxiliary source is connected. Two or more LTC4412s may be interconnected to allow load sharing between multiple batteries or charging of multiple batteries from a single charger. The wide supply operating range supports operation from one to six Li-Ion cells in series. The low quiescent current (11µA typical) is independent of the load current. The gate driver includes an internal voltage clamp for MOSFET protection.  The STAT pin can be used to enable an auxiliary P-channel MOSFET power switch when an auxiliary supply is detected. This pin may also be used to indicate to a microcontroller that an auxiliary supply is connected. The control (CTL) input enables the user to force the primary MOSFET off and the STAT pin low. The LTC4412ES6 is available in a low profile (1mm) ThinSOT package.

Features

Applications

• PCs
• PDAs
• Digital Cameras
• Modems
• Cell phones
• Digital Radios
• MP3 Players
• Active OR-ing of Redundant (N+1) Power Supplies
• Automotive battery protection
• ADAS domain controller