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LTC4370: Two-Supply Diode-OR Current Balancing Controller Data Sheet5/14/2012PDF263K
Overview
Features and Benefits
- Shares Load Between Two Supplies
- Eliminates Need for Active Control of Input Supplies
- No Share Bus Required
- Blocks Reverse Current
- No Shoot-Through Current During Start-Up or Faults
- 0V to 18V High Side Operation
- Enable Inputs
- MOSFET On Status Outputs
- Dual Ideal Diode Mode
- 16-Lead DFN (4mm × 3mm) and MSOP Packages
Product Details
The LTC4370 is a two-supply current sharing controller which incorporates MOSFET ideal diodes. The diodes block reverse and shoot-through currents during start-up and fault conditions. Their forward voltage is adjusted to share the load currents between supplies. Unlike other sharing methods, neither a share bus nor trim pins on the supply are required.
The maximum MOSFET voltage drop can be set with a resistor. A fast gate turn-on reduces the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse current transients.
The controller operates with supplies from 2.9V to 18V. For lower rail voltages, an external supply is needed at the VCC pin. Enable inputs can be used to turn off the MOSFET and put the controller in a low current state. Status outputs indicate whether the MOSFETs are on or off. The load sharing function can be disabled to turn the LTC4370 into a dual ideal diode controller.
Applications
- Redundant Power Supplies
- High Availability Systems and Servers
- Telecom and Network Infrastructure
Product Categories
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)
Documentation & Resources
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R536 Reliability Data3/26/2018PDF49 K
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DC1741A - Demo Manual (Rev. A)9/26/2012PDF140K
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DN1036 - Using a Current Sharing Controller with Non-Redundant Supplies11/30/2015PDF203K
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Ideal Diodes and Prioritizers6/8/2018PDF1 M
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Current Sharing Made Easy7/23/2012PDF538K
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Using a Current Sharing Controller when the Sum Current of Both Supplies is Required to Support the Load9/26/2016PDF863K
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Using a Current Sharing Controller with Non-Redundant Supplies11/30/2015
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Easy Balanced Load Sharing for Three or Four Supplies, Even with Unequal Supply Voltages5/1/2015 LT Journal
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Novel Current-Sharing IC Balances Two Supplies with Ease7/1/2012 LT Journal
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LTC4370 Video Product Brief10/30/2018
Tools & Simulations
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTC4370
Design Resources
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.
PCN-PDN Information
Support & Discussions
LTC4370 Discussions
RE: LTC4376 for protected load sharing?
5 week(s) ago in Power Management
Sample & Buy
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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.