LTC4370 - Two-Supply Diode-OR Current Balancing Controller

Features

  • 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

Typical Application

LTC4370 Typical Application
LTC4370 Typical Application

Description

The LTC®4370 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC4370CDE#PBF 4x3 DFN-16 DE C 05-08-1732 Yes
LTC4370CDE#TRPBF 4x3 DFN-16 DE C 05-08-1732 Yes
LTC4370CMS#PBF MS-16 MS C 05-08-1669 Yes
LTC4370CMS#TRPBF MS-16 MS C 05-08-1669 Yes
LTC4370IDE#PBF 4x3 DFN-16 DE I 05-08-1732 Yes
LTC4370IDE#TRPBF 4x3 DFN-16 DE I 05-08-1732 Yes
LTC4370IMS#PBF MS-16 MS I 05-08-1669 Yes
LTC4370IMS#TRPBF MS-16 MS I 05-08-1669 Yes


LTC4370 Package Drawing
LTC4370 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC4370CDE#PBF 4x3 DFN-16 C $7.07 $4.95 Yes
LTC4370CDE#TRPBF 4x3 DFN-16 C $5.01 Yes
LTC4370CMS#PBF MS-16 C $7.07 $4.95 Yes
LTC4370CMS#TRPBF MS-16 C $5.01 Yes
LTC4370IDE#PBF 4x3 DFN-16 I $8.13 $5.69 Yes
LTC4370IDE#TRPBF 4x3 DFN-16 I $5.75 Yes
LTC4370IMS#PBF MS-16 I $8.13 $5.69 Yes
LTC4370IMS#TRPBF MS-16 I $5.75 Yes
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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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1741A LTC4370CDE Demoboard | Two-Supply Diode-OR Current Sharing Controller $75.00
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Click here to view our complete list of demo boards

Applications

  • Redundant Power Supplies
  • High Availability Systems and Servers
  • Telecom and Network Infrastructure

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC4370

Technical Support