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

Texas Instruments UCC29002DGK

Name: UCC29002DGK
Brand: Texas Instruments
SKU: UCC29002DGK
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UCC29002DGK

Manufacturer:: Texas Instruments

Category:: Power Management - Specialized

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: UCC29002DGK.pdf

Description:: IC LOAD SHARE CTRLR ADV 8VSSOP

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Product details

Overview

UCC29002 from Texas Instruments is an advanced 8-pin BiCMOS load-share controller for paralleling multiple DC-DC modules or 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 rectifiers and server power shelves.

For engineers reviewing the UCC29002 datasheet, UCC29002 pinout, UCC29002 application, or UCC29002 equivalent, key selection criteria include its VSSOP-8 package (3.00 mm × 4.90 mm), single-wire load-share bus architecture, ±0.375 V UVLO hysteresis, and LS bus fault protection against shorts to GND or VDD.

Technical Context

The UCC29002 implements automatic leader/follower architecture using a transconductance error amplifier (g_M = 14 mS) and a post-package-trimmed current-sense amplifier with 75–90 dB CMRR and 2 MHz GBW. Its differential CSA inputs accept common-mode voltages from 0 V to V_DD, enabling shunt placement in either GND-return or positive output rail.

Load-share bus operation relies on a unity-gain LS driver with ideal-diode behavior inside the feedback loop, while LS receiver includes 15 kHz filtering and 100 kΩ input impedance. Start-up mode forces ADJ sink current to maximum until V_CSO exceeds 80% of V_LS, ensuring rapid current engagement without external sequencing.

Key Specifications

Parameter	Value and Actual Design Meaning
Current-share accuracy	<1% error at full load - enables precise current balancing across ≥2 parallel modules without manual trimming
Current-sense offset voltage	±100 µV max at 25°C - allows use of low-value shunts (e.g., 1 mΩ) to minimize power loss
UVLO threshold	4.375 V (typ), 0.375 V hysteresis - prevents erratic operation during brownout or soft-start conditions
LS bus drive capability	±1.5 mA output - supports up to 10 modules on shared bus when V_LS = 10 V and R_IN = 100 kΩ
Operating temperature	–40°C to +105°C - qualified for industrial and telecom base station environments
VDD supply range	4.575 V to 13.5 V - compatible with 5 V, 12 V, and intermediate bias rails; internal 14.25 V clamp protects against overvoltage
Package	VSSOP-8 (DGK), 3.00 mm × 4.90 mm - space-constrained PCBs in modular power systems

Pinout & Package

UCC29002 is housed in an 8-pin VSSOP (DGK) package with exposed thermal pad (not electrically connected). The package measures 3.00 mm × 4.90 mm and is lead-free assembly compatible.

Pin/Terminal	Circuit Role	Design Meaning
CS− (1)	Inverting input of current-sense amplifier	Accepts shunt voltage reference; combined with CS+ enables enable/disable function via 0.5 V differential threshold
CS+ (2)	Noninverting input of current-sense amplifier	Differential pair with CS−; common-mode range spans 0 V to V_DD, supporting GND- or high-side shunt placement
VDD (3)	Power supply input	Bias rail (4.575–13.5 V); requires local 0.1–1 µF low-ESL capacitor; internal clamp limits to 14.25 V
GND (4)	Reference and power ground	Common return for all analog and power functions; must connect to converter S− path
ADJ (5)	Adjust amplifier output	Sinks current proportional to EAO error voltage; drives remote-sense node to modulate module output voltage
EAO (6)	Error amplifier output	Transconductance output (14 mS); develops VEAO across external compensation network to control ADJ current
LS (7)	Load-share bus I/O	Unity-gain driver/receiver; carries leader's V_CSO signal; includes fault detection for V_LS outside (2/3)V_CSO to V_DD−0.7 V window
CSO (8)	Current-sense amplifier output	Amplified shunt voltage (gain user-programmable, min 3×); feeds EAO and LS driver; rail-to-rail 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 digital communication interface
Intel® SSI compliance	Meets industry-standard timing, accuracy, and fault-response requirements for server and telecom power systems
LS bus short-circuit protection	Window comparator disables controller if V_LS falls below (2/3)V_CSO or exceeds V_DD−0.7 V - prevents erroneous voltage adjustment
Start-up current forcing	Drives ADJ to max sink current during startup until V_CSO > 0.8×V_LS, accelerating load engagement without external circuitry
GND- or high-side current sensing	CS+/CS− common-mode range (0 V to V_DD) allows shunt placement in either path - simplifies layout in high-voltage outputs

Applications

Telecom Rectifier Systems	Server Power Shelves
Use Scenario: Paralleling multiple 48 V DC-DC modules in central office power distribution. IC Role / Device Role / Timing Role: Load-share controller coordinating current balance across hot-swappable modules using single-wire LS bus. Use Value: Enables N+1 redundancy with <1% current mismatch, reducing thermal stress and extending module lifetime.	Use Scenario: Combining multiple ATX or CRPS power supplies in rack-mounted servers. IC Role / Device Role / Timing Role: Automatic leader/follower arbitration among independent PSUs to maintain stable 12 V output under dynamic load steps. Use Value: Eliminates need for custom firmware or digital PMBus coordination; achieves fast transient response via analog bus.
Industrial PLC Power Modules	Medical Imaging Power Subsystems
Use Scenario: Redundant 24 V power for programmable logic controllers requiring continuous uptime. IC Role / Device Role / Timing Role: Analog load-share supervisor interfacing with isolated DC-DC converters via remote sense lines. Use Value: Maintains tight current matching (<1%) across modules despite PCB trace resistance variations and temperature gradients.	Use Scenario: High-reliability 5 V/3.3 V power for CT/MRI subsystems where failure tolerance is critical. IC Role / Device Role / Timing Role: Fault-tolerant current balancer with LS bus short-circuit detection and automatic disconnect. Use Value: Prevents single-point failure propagation; ensures uninterrupted operation during bus faults or module replacement.

Telecom Rectifier Systems

Server Power Shelves

Use Scenario: Paralleling multiple 48 V DC-DC modules in central office power distribution.

IC Role / Device Role / Timing Role: Load-share controller coordinating current balance across hot-swappable modules using single-wire LS bus.

Use Value: Enables N+1 redundancy with <1% current mismatch, reducing thermal stress and extending module lifetime.

Use Scenario: Combining multiple ATX or CRPS power supplies in rack-mounted servers.

IC Role / Device Role / Timing Role: Automatic leader/follower arbitration among independent PSUs to maintain stable 12 V output under dynamic load steps.

Use Value: Eliminates need for custom firmware or digital PMBus coordination; achieves fast transient response via analog bus.

Industrial PLC Power Modules

Medical Imaging Power Subsystems

Use Scenario: Redundant 24 V power for programmable logic controllers requiring continuous uptime.

IC Role / Device Role / Timing Role: Analog load-share supervisor interfacing with isolated DC-DC converters via remote sense lines.

Use Value: Maintains tight current matching (<1%) across modules despite PCB trace resistance variations and temperature gradients.

Use Scenario: High-reliability 5 V/3.3 V power for CT/MRI subsystems where failure tolerance is critical.

IC Role / Device Role / Timing Role: Fault-tolerant current balancer with LS bus short-circuit detection and automatic disconnect.

Use Value: Prevents single-point failure propagation; ensures uninterrupted operation during bus faults or module replacement.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC39002	Same functional block diagram and pinout; wider operating temperature (0°C to 70°C) but narrower than UCC29002; no start-up current forcing - ADJ follows EAO immediately	Preferred for commercial-grade systems where rapid startup is not required and ambient temperature stays within 0–70°C	Select UCC39002 only if system ambient never drops below 0°C and slower load engagement is acceptable.
UC3907	Legacy predecessor; lacks LS bus protection, higher current-share error (>2%), no VSSOP option; PDIP/SOIC only	Used in legacy telecom upgrades where board space and fault robustness are secondary to cost	Choose UC3907 only for backward-compatible replacements where design change is prohibited and <1% accuracy is not mandatory.

Compared with UCC39002 and UC3907, the UCC29002 provides superior current-share accuracy, integrated LS bus fault protection, and support for industrial temperature range - making it the optimal choice for new designs requiring reliability and compact packaging.

Availability

UCC29002 is available at Aetrix Electronics and suitable for telecom rectifiers, server power shelves, and industrial PLC power modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for UCC29002 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 specializing in analog and embedded processing technologies, with leadership in power management ICs and high-reliability industrial components.

The UCC29002 belongs to TI's advanced load-share controller product line, designed specifically for analog-based N+1 redundant power systems in telecom, server, and industrial infrastructure where digital bus complexity and latency are unacceptable.

FAQ

What is the primary function of the UCC29002 in a power system?

The UCC29002 is a dedicated analog load-share controller that enables precise current balancing across two or more parallel DC-DC modules or power supplies. It uses a differential current-sense amplifier and single-wire load-share bus to implement automatic leader/follower operation - ensuring <1% current-share error at full load without requiring digital communication or firmware. This makes the UCC29002 essential for N+1 redundant architectures in telecom and server applications where reliability and simplicity are critical.

Does the UCC29002 support both high-side and low-side current sensing?

Yes, the UCC29002 supports both configurations. Its current-sense amplifier has a common-mode input range spanning 0 V to V_DD, allowing the shunt resistor to be placed either in the GND-return path (low-side) or the positive output rail (high-side). For high-voltage outputs, TI recommends low-side placement to avoid level-shifting challenges and noise coupling. The enable function also leverages the CS+/CS− pins, with specific voltage thresholds defined for each configuration to ensure reliable disable behavior.

How does the UCC29002 handle load-share bus faults?

The UCC29002 continuously monitors the LS bus voltage using an internal window comparator. A fault is asserted if V_LS falls below (2/3)×V_CSO or rises above V_DD − 0.7 V - covering shorts to GND or the supply rail. Upon fault detection, the device disables the LS bus driver and forces the ADJ pin current to zero, preventing erroneous output voltage adjustments. This protection is active during normal operation and does not require external components, enhancing system safety in mission-critical power applications.

What is the purpose of the ADJ pin on the UCC29002?

The ADJ pin on the UCC29002 sinks a current proportional to the error voltage (VEAO) generated by the transconductance error amplifier. This current flows through the module's remote-sense resistor and adjust resistor (RADJ), effectively raising the feedback reference and increasing the module's output voltage to match the leader's current level. During startup, the UCC29002 forces maximum ADJ sink current to accelerate load engagement; at steady state, ADJ current dynamically adjusts to maintain balanced current sharing - making it central to closed-loop analog load-sharing control.

Can the UCC29002 be used with power supplies lacking remote-sense capability?

No - the UCC29002 requires remote-sense capability to function correctly. Its ADJ pin injects current into the feedback network to modulate output voltage, which only works when the power supply has separate S+ and S− sense lines connected directly to the load. Using the UCC29002 with non-remote-sense supplies would cause unstable regulation or damage due to incorrect feedback injection. TI explicitly specifies compatibility with modules having remote-sense capability, such as those based on TPS4005x or LM25145 controllers.

UCC29002DGK Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tube

Product Status:: Obsolete

Applications:: Load Share Controller

Current - Supply:: 2.5mA

Voltage - Supply:: 4.375V ~ 14.25V

Operating Temperature:: -40°C ~ 105°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-VSSOP

UCC29002DGK FAQ

1.How can I place an order for UCC29002DGK through Aetrix?

Please submit a Request for Quotation (RFQ) for UCC29002DGK 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 UCC29002DGK reliable?

The price and inventory of UCC29002DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC29002DGK is usually 5 days.

3.What payment methods are accepted for UCC29002DGK?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC29002DGK transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UCC29002DGK?

UCC29002DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UCC29002DGK 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 UCC29002DGK?

For technical support, including UCC29002DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC29002DGK requirements.

6.How does Aetrix verify that UCC29002DGK is sourced from the original manufacturer or authorized distributors?

All UCC29002DGK 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 UCC29002DGK meets industry standards.

7.What is the process for return or replacement of UCC29002DGK?

All UCC29002DGK units undergo pre-shipment inspection (PSI). If there is an issue with UCC29002DGK, 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 UCC29002DGK part is unused and in its original packaging.

Return procedure for UCC29002DGK:

1.Submit a request within 90 days.

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

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