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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

Texas Instruments UCC39002P

Name: UCC39002P
Brand: Texas Instruments
SKU: UCC39002P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UCC39002P

Manufacturer:: Texas Instruments

Category:: Power Management - Specialized

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: UCC39002P.pdf

Description:: IC LOAD SHARE CTRLR ADV 8-DIP

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Product details

Overview

UCC39002 from Texas Instruments is an advanced 8-pin BiCMOS load-share controller for paralleling DC-DC modules and power supplies in N+1 redundant systems. It delivers <1% current-share error at full load, supports high-side or low-side current sensing via ultra-low-offset amplifier (±100 µV), and complies with Intel® SSI load-share specification. Used in telecom and server power systems to balance output current across multiple supplies.

For engineers reviewing the UCC39002 datasheet, UCC39002 pinout, UCC39002 application, or UCC39002 equivalent, key selection criteria include its 0–13.5 V VDD operating range, ±0.6 µA CS+ / CS− input bias current, LS bus protection against shorts to GND or supply rail, and start-up behavior where adjust current is forced to maximum until VCSO exceeds 80% of VLS.

Technical Context

The UCC39002 implements automatic leader/follower architecture using a transconductance error amplifier (g_M = 14 mS) and a unity-gain load-share bus driver with ideal-diode behavior. Its differential current-sense amplifier has 75–90 dB gain and 75–90 dB CMRR, enabling precise shunt-based current monitoring across 0 V to V_DD common-mode range.

It features dual protection mechanisms: LS bus fault detection via window comparator (triggers on V_LS < 2/3×V_CSO or V_LS > V_VDD − 0.7 V), and enable/disable control via CS+/CS− pins with −0.5 V internal offset. Start-up forces ADJ to sink max current until V_CSO > 0.8 × V_LS, ensuring rapid current engagement.

Key Specifications

Parameter	Value and Actual Design Meaning
VDD Operating Range	4.575 V to 13.5 V - defines minimum bias for reliable UVLO hysteresis and maximum rail before clamp activation
Current-Share Accuracy	<1% error at full load - enables tight current matching across ≥2 parallel modules without external calibration
CS Amplifier Offset	±100 µV (25°C), ±10 µV/°C drift - allows use of sub-1 mΩ shunts while maintaining accuracy over temperature
LS Bus Output Drive	±1.5 mA output current - limits max parallel module count to ~10 when V_LS = 10 V and R_IN = 100 kΩ
Error Amplifier g_M	14 mS - sets loop gain for stable compensation with single-pole RC network on EAO pin
ADJ Sink Current	3.45–4.55 mA (−40°C to +105°C) - determines voltage adjustment resolution via RADJ/RSENSE ratio
UVLO Threshold	4.175–4.575 V (rising), 3.625–4.025 V (falling) - ensures operation only within stable bias margin for accurate bus signaling

Pinout & Package

UCC39002 is available in 8-pin VSSOP (3.00 mm × 4.90 mm) and SOIC (4.90 mm × 6.00 mm) packages. Pin functions are identical across packages per TI SLUS495J Rev. December 2023.

Pin/Terminal	Circuit Role	Design Meaning
CS− (1)	Inverting input of current-sense amplifier	Used with CS+ to measure shunt voltage; also part of ENABLE comparator with −0.5 V internal offset
CS+ (2)	Noninverting input of current-sense amplifier	Accepts 0 V to V_DD common-mode signals; placement in GND or VOUT path enabled by rail-to-rail input range
VDD (3)	Power supply input	Biased at 4.575–13.5 V; requires 0.1–1 µF low-ESL capacitor near pin for clamp stability and noise immunity
GND (4)	Reference ground	Common return for all analog and power functions; must connect to S− sense path of controlled converter
ADJ (5)	Adjust amplifier output	Sinks current proportional to VEAO to raise module output voltage; clamped to ≥VEAO + 1 V
EAO (6)	Error amplifier output	Transconductance output (14 mS) driving external RC compensation; clamped to 3.5–3.8 V high-level
LS (7)	Load-share bus I/O	Drives or receives bus voltage; disconnects during fault/start-up; protected against shorts to GND or VDD
CSO (8)	Current-sense amplifier output	Amplified shunt signal (75–90 dB gain); drives LS bus and feeds error amplifier; 0–11.8 V output swing

Key Features

Feature	Design Value
Single-wire load-share bus	Reduces inter-module wiring to one trace; eliminates need for master clock or daisy-chained timing signals
Intel® SSI compliance	Ensures interoperability with OEM power supplies requiring standardized load-sharing interface and timing
Full-scale adjustability	Allows system-level tuning of current-share gain via external resistor on CSO, enabling optimization for shunt value and bus voltage
LS bus short-circuit protection	Prevents erroneous voltage adjustment during accidental shorts by disabling ADJ and disconnecting LS driver
High-side or low-side sensing	Supports shunt placement in either output rail or GND return path-critical for high-voltage or isolated designs
Standby bus disconnect	Removes follower modules from LS bus during idle, eliminating leakage-induced drift and cross-talk

Applications

Telecom Power Shelf	Server N+1 Redundancy
Use Scenario: Multiple hot-swappable 48 V DC-DC modules supply backplane power in carrier-grade telecom shelves. IC Role / Device Role / Timing Role: UCC39002 acts as distributed load-share controller per module, dynamically assigning leader/follower roles based on real-time current and bus voltage. Use Value: Enables seamless current balancing across up to 10 modules without centralized arbitration, meeting GR-1089 immunity and NEBS thermal requirements.	Use Scenario: Dual 12 V VRMs supply CPU core power in enterprise servers with N+1 redundancy for uptime assurance. IC Role / Device Role / Timing Role: UCC39002 monitors each VRM's output current via low-side shunt and adjusts feedback via ADJ pin to equalize load. Use Value: Achieves <1% current mismatch at full load, preventing thermal runaway and extending VRM lifetime under asymmetric transient loads.
Industrial PLC Power Distribution	Medical Imaging Power System
Use Scenario: Modular 24 V power supplies feed I/O modules in programmable logic controllers with field-replaceable redundancy. IC Role / Device Role / Timing Role: UCC39002 operates in low-side sensing mode with remote sense lines, compensating for PCB trace resistance between supply and load. Use Value: Maintains ±0.5% output regulation across 0–10 A per module despite 50 mΩ interconnect resistance, satisfying IEC 61000-4-30 Class A accuracy.	Use Scenario: Parallel 50 V/10 A switching supplies power X-ray generator subsystems requiring zero-failure operation. IC Role / Device Role / Timing Role: UCC39002 provides fault-isolated load sharing: LS bus disconnects on short, preserving individual supply integrity during diagnostic cycles. Use Value: Eliminates single-point failure in critical imaging chain; LS bus protection prevents cascading faults during ESD events per IEC 60601-1-2 Ed. 3.1.

Telecom Power Shelf

Server N+1 Redundancy

Use Scenario: Multiple hot-swappable 48 V DC-DC modules supply backplane power in carrier-grade telecom shelves.

IC Role / Device Role / Timing Role: UCC39002 acts as distributed load-share controller per module, dynamically assigning leader/follower roles based on real-time current and bus voltage.

Use Value: Enables seamless current balancing across up to 10 modules without centralized arbitration, meeting GR-1089 immunity and NEBS thermal requirements.

Use Scenario: Dual 12 V VRMs supply CPU core power in enterprise servers with N+1 redundancy for uptime assurance.

IC Role / Device Role / Timing Role: UCC39002 monitors each VRM's output current via low-side shunt and adjusts feedback via ADJ pin to equalize load.

Use Value: Achieves <1% current mismatch at full load, preventing thermal runaway and extending VRM lifetime under asymmetric transient loads.

Industrial PLC Power Distribution

Medical Imaging Power System

Use Scenario: Modular 24 V power supplies feed I/O modules in programmable logic controllers with field-replaceable redundancy.

IC Role / Device Role / Timing Role: UCC39002 operates in low-side sensing mode with remote sense lines, compensating for PCB trace resistance between supply and load.

Use Value: Maintains ±0.5% output regulation across 0–10 A per module despite 50 mΩ interconnect resistance, satisfying IEC 61000-4-30 Class A accuracy.

Use Scenario: Parallel 50 V/10 A switching supplies power X-ray generator subsystems requiring zero-failure operation.

IC Role / Device Role / Timing Role: UCC39002 provides fault-isolated load sharing: LS bus disconnects on short, preserving individual supply integrity during diagnostic cycles.

Use Value: Eliminates single-point failure in critical imaging chain; LS bus protection prevents cascading faults during ESD events per IEC 60601-1-2 Ed. 3.1.

Equivalent & Alternatives

The following parts are listed as comparable options for similar load-share controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC29002	Identical electrical specs and pinout; rated for −40°C to +105°C (vs. UCC39002's 0°C to +70°C)	Preferred for industrial or extended-temp environments where ambient exceeds 70°C	Select UCC29002 when operating junction temperature may exceed 70°C; same layout and BOM
UC3907	Legacy 16-pin controller; no integrated LS bus protection; requires external diodes for leader/follower isolation	Suitable only for legacy redesigns with existing UC3907 footprint and tolerance for higher board area	Choose UC3907 only if migrating from prior-generation designs; UCC39002 offers 45% smaller VSSOP footprint and built-in fault handling

Compared with UCC29002, the UCC39002 trades extended temperature range for cost and qualification suitability in commercial telecom/server applications; compared with UC3907, it integrates bus protection and reduces component count by 6 discrete parts per module while improving current-match accuracy by 2.3×.

Availability

UCC39002 is available at Aetrix Electronics and suitable for telecom power shelves, server N+1 redundant systems, and industrial PLC power distribution requiring stable component supply across multi-year production cycles.

Supply support for UCC39002 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.

The UCC39002 belongs to TI's high-reliability load-share controller product line, engineered specifically for N+1 redundant DC-DC module paralleling in telecom and server infrastructure where current matching accuracy and bus fault resilience are critical.

FAQ

What is the operating temperature range for UCC39002?

The UCC39002 is specified for operation from 0°C to +70°C ambient temperature. This range is narrower than the UCC29002 (−40°C to +105°C) and reflects its target use in commercial telecom and server applications where chassis airflow maintains moderate thermal conditions. Junction temperature must remain ≤150°C per absolute maximum ratings, and thermal design should account for R_θJA = 168.0°C/W in VSSOP package.

How does UCC39002 handle load-share bus faults?

The UCC39002 continuously monitors the LS bus voltage using an internal window comparator. A fault is asserted if V_LS < (2/3 × V_CSO) or V_LS > (V_VDD − 0.7 V), indicating short to GND or supply rail. Upon fault detection, the UCC39002 disables the LS bus driver, forces ADJ sink current to zero, and isolates itself from the bus-preventing erroneous voltage adjustment in the controlled power supply.

Can UCC39002 be used with high-side current sensing?

Yes, UCC39002 supports high-side current sensing: its current-sense amplifier accepts common-mode inputs from 0 V to V_DD, allowing the shunt resistor to be placed in the positive output rail. However, when disabling the device in high-side configuration, pull CS+ at least 0.5 V below CS− instead of forcing CS− > CS+ by 0.5 V, to avoid exceeding the CS− absolute maximum rating of V_VDD + 0.3 V.

What is the purpose of the ADJ pin on UCC39002?

The ADJ pin on UCC39002 sinks a current (I_ADJ) proportional to the error voltage (V_EAO) developed by the transconductance error amplifier. This current flows through the parallel combination of the power supply's remote-sense resistor and external adjust resistor (R_ADJ), effectively raising the module's output voltage to match the leader's current level. At startup, UCC39002 forces maximum I_ADJ to rapidly engage load sharing.

Is UCC39002 pin-compatible with UCC29002?

Yes, UCC39002 is fully pin-compatible and functionally identical to UCC29002 in all respects except operating temperature range (0°C to +70°C vs. −40°C to +105°C) and orderable part numbering. Both share identical pinout, electrical characteristics, functional block diagram, and application circuitry-enabling drop-in replacement where ambient temperature constraints permit.

UCC39002P Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Bulk

Product Status:: Obsolete

Applications:: Load Share Controller

Current - Supply:: 2.5mA

Voltage - Supply:: 4.375V ~ 14.25V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-PDIP

UCC39002P FAQ

1.How can I place an order for UCC39002P through Aetrix?

Please submit a Request for Quotation (RFQ) for UCC39002P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for UCC39002P reliable?

The price and inventory of UCC39002P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC39002P is usually 5 days.

3.What payment methods are accepted for UCC39002P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC39002P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UCC39002P?

UCC39002P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UCC39002P order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for UCC39002P?

For technical support, including UCC39002P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC39002P requirements.

6.How does Aetrix verify that UCC39002P is sourced from the original manufacturer or authorized distributors?

All UCC39002P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UCC39002P meets industry standards.

7.What is the process for return or replacement of UCC39002P?

All UCC39002P units undergo pre-shipment inspection (PSI). If there is an issue with UCC39002P, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The UCC39002P part is unused and in its original packaging.

Return procedure for UCC39002P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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