Copyright © 2016, Texas Instruments Incorporated

CS+

VDD

CSO

LS

EAO

ADJ

UCC39002

V+

V+

S+

V−

S−

LOAD

POWER

SUPPLY

WITH

REMOTE

SENSE

RSHUNT

RADJ

CS−

2

3

4

8

7

6

5

GND

1

Product

Folder

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Reference

Design

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

UCC29002, UCC29002-1, UCC39002

SLUS495I – SEPTEMBER 2001 – REVISED MAY 2016

UCC2900x, UCC39002 Advanced 8-Pin Load-Share Controller

1

1 Features

1

•

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

•

•

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

2 Applications

•

Modules With Remote-Sense Capability

•

Modules With Remote-Sense Capability

•

Modules With Remote-Sense Capability

•

In Conjunction With the Internal Feedback E/A of

OEM Power Supply Units

3 Description

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

either the GND return path or in the positive output

rail of the power supply.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

UCC29002

SOIC (8)

4.90 mm × 3.91 mm

UCC29002-1

VSSOP (8)

3.00 mm × 3.00 mm

UCC39002

PDIP (8)

9.81 mm × 6.35 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Low-Side Current-Sensing Application