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Overview
Features and Benefits
- Designed Specifically to Drive Large QG PFETs
- Very Low Loss Replacement for Power Supply OR’ing Diodes
- 3.5V to 36V AC/DC Adapter Voltage Range
- Minimal External Components
- Automatic Switching Between DC Sources
- Low Quiescent Current: 30µA
- 3V to 36V Battery Voltage Range
- Limited Reverse Battery Protection
- MOSFET Gate Protection Clamp
- Manual Control Input
- Space Saving 8-Lead MSOP Package
Product Details
The LTC4414 controls an external P-channel MOSFET to create a near ideal diode function for power switchover. This permits highly efficient OR’ing of multiple power sources for extended battery life and low self- heating. 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 LTC4414s may be interconnected to allow switchover between multiple batteries or charging of multiple batteries from a single charger.
The wide supply operating range supports operation from one to eight Li-Ion cells in series. The low quiescent current (30µA 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 LTC4414 is available in a low profile 8-lead MSOP package.
Applications
- High Current Power Path Switch
- Industrial and Automotive Applications
- Uninterruptable Power Supplies
- Logic Controlled Power Switch
- Battery Backup Systems
- Emergency Systems with Battery Backups
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Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
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LTspice
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Models for the following parts are available in LTspice:
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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.