Features and Benefits
- Reduces Power Dissipation by Replacing a Power Schottky Diode
- Low Quiescent Current: 5μA Operating
- Wide Operating Voltage Range: 2.5V to 80V
- Reverse Supply Protection to –28V
- No TVS Input Clamps Required
- High Side External N-Channel MOSFET Drive
- Drives Back-to-Back MOSFETs for Inrush Control and Load Switching
- Shutdown Input for ON/OFF Control
- Fast Reverse Current Turn-Off within 1.5μs
- 8-Lead MSOP and 3mm × 3mm DFN Packages
The LTC4372/LTC4373 are positive high voltage ideal diode controllers that drive an external N-channel MOSFET to replace a Schottky diode. They control the forward voltage drop across the MOSFET to ensure current delivery or current transfer from one path to the other even at light loads.
A 5μA operating current achieves high efficiency for intermittent load applications or always-on backup power supplies. If a power source fails or is shorted, a fast turn-off minimizes reverse current transients. The LTC4372/LTC4373 control back-to-back N-channel MOSFETs for inrush current control and load switching.
The LTC4372’s SHDN pin keeps the MOSFET off and reduces the quiescent current to 3.5μA. The LTC4373 has a UV pin for undervoltage monitoring while the UVOUT pin provides hysteresis adjustment and status information. During undervoltage, the back-to-back MOSFETs are cut off and quiescent current reduces to 0.5μA.
- Automotive Battery Protection
- Redundant Power Supplies
- Portable Instrumentation
- Solar Powered Systems
- Energy Harvesting Applications
- Supply Holdup
Markets and Technologies
Product Lifecycle 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.
Evaluation Kits (1)
The DC2969A circuit board enables evaluation of the LTC4372 and LTC4373 low quiescent current ideal diode controllers. The DC2969A-A option is assembled with the LTC4372 controller, whereas DC2969A-B is assembled with the LTC4373 controller. DC2969A includes two independent ideal diode circuits sharing a common ground, operating over a 2.5V to 33V range, and protecting the load against reverse inputs of up to –28V. One of these circuits includes a high side load switch in series with the ideal diode allowing load on/off control with the SHDN/UV jumper. In addition, input dropouts are blocked from the output, permitting capacitors to hold up the load when input power fails. Each channel can carry up to 20A.
Documentation & Resources
Ideal Diodes and Prioritizers6/8/2018
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.