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
AEC-Q100 data available for specific packages
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 |
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 | ||
| Buy Now • Request Samples | ||||||
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 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC4370IDE#PBF | 4x3 DFN-16 | I | $8.13 | $5.69 | Yes | |
| LTC4370IDE#TRPBF | 4x3 DFN-16 | I | $5.75 | Yes | ||
| Buy Now • Request Samples | ||||||
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
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
