Advanced 8 pin load share controller, 0°C to 70°C


Product details


Share bus Single-Ended Operating supply current (mA) 2.5 Startup current (uA) 2500 Operating supply (Min) (V) 4.375 Operating supply (Max) (V) 14.25 Features UVLO Operating temperature range (C) 0 to 70 open-in-new Find other Load share controllers

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Load share controllers


  • High Accuracy, Better Than 1% Current Share
    Error at Full Load
  • High-Side or Low-Side (GND Reference) Current-
    Sense Capability
  • Ultra-Low Offset Current Sense Amplifier
  • Single Wire Load Share Bus
  • Full Scale Adjustability
  • Intel® SSI Load Share Specification Compliant
  • Disconnect from Load Share Bus at Stand-By
  • Load Share Bus Protection Against Shorts to GND
    or to the Supply Rail
  • 8-Pin MSOP Package Minimizes Space
  • Lead-Free Assembly
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The UCC39002 device is an advanced, high-performance, and low-cost load share controller that provides all necessary functions to parallel multiple independent power supplies or DC-to-DC modules. Targeted for high-reliability applications in server, workstation, telecom, and other distributed power systems, the controller is suitable for N+1 redundant systems or high current applications where off-the-shelf power supplies must be paralleled.

The BiCMOS UCC39002 is based on the automatic master or slave architecture of the UC3902 and UC3907 load share controllers. The device provides better than 1% current share error between modules at full load by using a very low offset post-package-trimmed current sense amplifier and a high-gain negative feedback loop. And with the amplifier’s common-mode range of 0 V to the supply rail, the current sense resistor, RSHUNT, can be placed in either the GND return path or in the positive output rail of the power supply.

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Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The UCC39002 is an advanced, high-performance load-share controller that provides all the necessary functions to parallel multiple independent power supplies or dc-to-dc modules. This load-share circuit is based upon the automatic master/slave architecture utilized in the UC3902 and UC3907 (...)

  • High accuracy, better than 1% current share error at full load
  • High-side current sensing
  • Ultra-low offset current sense amplifier
  • Single wire load-share bus
  • Intel® SSI load-share spcification compliant
  • Disconnect from load-share bus at stand-by
  • Load-share bus protection against shorts to GND or to the (...)

Design tools & simulation

SLUC045A.ZIP (396 KB)
SLUC019.ZIP (129 KB)
SLUC684.ZIP (109 KB)

Reference designs

Isolated CCM Flyback producing 12V@10A Reference Design
PMP8906 — The following design is a 60W Flyback which uses the UCC3809 and the UCC39002. It creates a 12V@10A output by employing dual 12V@5A. The system functions in the continuous conduction mode.
Design files
Parallel Flyback Converters (12V@4A) for PoE Powered Device (PD) Reference Design
PMP5236 PMP5236 uses parallel converters for Class 4 or high power PoE applications. The flyback converter with diode rectifier offers low cost solution while still achieving good efficiency. This reference design is well suited for PoE applications where power redundancy (12V@2A) or output power sharing (...)

CAD/CAE symbols

Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options
VSSOP (DGK) 8 View options

Ordering & quality

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