Overview
The UCC29002DGKR, produced by Texas Instruments, is an advanced, high-performance load-share controller designed to parallel multiple independent power supplies or DC-to-DC modules. This device is part of the UCC29002 family, which includes the UCC29002 and UCC29002-1 variants. It is targeted for high-reliability applications in servers, workstations, telecom, and other distributed power systems, particularly in N+1 redundant systems or high-current applications where off-the-shelf power supplies need to be paralleled.
The UCC29002DGKR is built on a 15V BiCMOS process, ensuring high accuracy and reliability. It features an automatic leader/follower architecture, similar to its predecessor UC3902 and UC3907 load-share controllers, allowing for better than 1% current-share error between modules at full load.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Current (Idle State) | LS = floating (open pin), VADJ = 5V | 2.5 | 3.5 | mA | |
| VDD Clamp Voltage | IVDD = 6mA | 13.5 | 14.25 | 15 | V |
| Start-up Voltage Threshold (VDD rising) | 4.175 | 4.375 | 4.575 | V | |
| Hysteresis to UVLO (VDD falling) | 0.2 | 0.375 | 0.55 | V | |
| Input Offset Voltage (Current-Sense Amplifier) | TA = 25 °C, VIC = 0.5V or 11.5V, VCSO = 5 V | -100 | 100 | µV | |
| Operating Temperature Range | -40 | 105 | °C | ||
| Package Type | VSSOP (8) | ||||
| Package Size | 3.00mm × 4.90mm |
Key Features
- High accuracy: Capable of less than 1% current-share error at full load.
- High-side or low-side (GND-referenced) 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.
- Compact 8-pin VSSOP package minimizes space.
- Lead-free assembly.
Applications
- Modules with remote-sense capability.
- In conjunction with the internal feedback E/A of OEM power supply units.
- High-reliability applications in servers, workstations, telecom, and other distributed power systems.
- N+1 redundant systems.
- High-current applications where off-the-shelf power supplies must be paralleled.
Q & A
- What is the primary function of the UCC29002DGKR?
The primary function of the UCC29002DGKR is to provide load-sharing control for multiple independent power supplies or DC-to-DC modules, ensuring high accuracy and reliability in distributed power systems.
- What is the current-share error at full load for the UCC29002DGKR?
The UCC29002DGKR is capable of less than 1% current-share error at full load.
- Can the UCC29002DGKR be used in high-voltage applications?
Yes, the UCC29002DGKR can be used in high-voltage applications, but it is recommended to locate the current-sense resistor in the GND-return path to avoid signal distortion and ensure accuracy.
- What is the operating temperature range for the UCC29002DGKR?
The operating temperature range for the UCC29002DGKR is -40°C to 105°C.
- What type of package does the UCC29002DGKR come in?
The UCC29002DGKR comes in an 8-pin VSSOP package.
- Is the UCC29002DGKR lead-free?
Yes, the UCC29002DGKR is lead-free.
- What is the purpose of the load-share bus in the UCC29002DGKR?
The load-share bus is used to communicate the output current information between the leader and follower modules, ensuring balanced current distribution.
- How does the UCC29002DGKR protect against faults on the load-share bus?
The UCC29002DGKR protects against shorts to GND or the supply rail on the load-share bus by pulling the inverting input of the Adjust amplifier to GND in fault conditions.
- What is the minimum start-up voltage threshold for the UCC29002DGKR?
The minimum start-up voltage threshold for the UCC29002DGKR is 4.175V.
- Can the UCC29002DGKR be used in N+1 redundant systems?
Yes, the UCC29002DGKR is suitable for N+1 redundant systems and high-current applications where off-the-shelf power supplies must be paralleled.
