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Copyright © 2016, Texas Instruments Incorporated
CS+
VDD
CSO
LS
EAO
ADJ
UCC39002
V+V+
S+
V−
S−
LOAD
POWER
SUPPLY
WITH
REMOTE
SENSE
LS BUS
SYSTEM+
SYSTEM+−
R
SHUNT
R
ADJ
CS−
2
3
4
8
7
6
5GND
1
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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 2001REVISED 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
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
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
current sense resistor, R
SHUNT
, can be placed in
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

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