Texas Instruments UCC2800MDREP

Overview

UCC2800MDREP from Texas Instruments is a radiation-tolerant, extended-temperature-range current-mode PWM controller IC for off-line and DC-DC switching power supplies. It delivers 100% maximum duty cycle, 5 V reference voltage with ±1.5% tolerance, 7.2 V turn-on/6.9 V turn-off UVLO thresholds, and operates from −55°C to 125°C in an 8-pin SOIC (D) package. It drives external MOSFETs in flyback, forward, and push-pull topologies for aerospace and defense power systems.

For engineers reviewing the UCC2800MDREP datasheet, UCC2800MDREP pinout, UCC2800MDREP application, or UCC2800MDREP equivalent, key selection criteria include its enhanced plastic (EP) qualification, full-cycle internal soft start, leading-edge blanking on CS input, 70 ns current-sense-to-output response, and compatibility with UC3842/UC3842A layouts in high-reliability power conversion designs.

Technical Context

The UCC2800MDREP implements fixed-frequency current-mode control using a BICMOS process optimized for low quiescent current (100 μA typical start-up, 500 μA typical operating). Its oscillator supports up to 1 MHz operation, with frequency set by external RC network connected between REF and RC pins, and features digital leading-edge blanking (50–150 ns) on the CS input to suppress gate-drive-induced noise.

It integrates a 2 MHz error amplifier with true rail-to-rail sourcing/sinking capability at COMP, a 1 A totem-pole output stage with 0.1–0.9 V low-level and 0.15–1.9 V high-level saturation voltages, and internal fault soft-start triggered by overcurrent events. The device shares identical pinout and functional architecture with UC3842/UC3842A but adds full-cycle soft start and improved transient response.

Key Specifications

Pinout & Package

UCC2800MDREP is housed in an 8-pin plastic SOIC (D) package per JEDEC MS-012, with 1.27 mm pitch, 5.00 mm width, and 6.20 mm body length. Pin 1 is located in quadrant Q1 per tape-and-reel standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-mode PWM controller applications.

Compared with UCC2800QDREP and UC3842N, UCC2800MDREP uniquely delivers −55°C cold-start capability, full-cycle soft start, and enhanced DMS pedigree-making it the sole choice for space-grade power controllers where reliability under extreme thermal stress is non-negotiable.

Availability

UCC2800MDREP is available at Aetrix Electronics and suitable for aerospace power supplies, defense radar transmitters, and avionics flight control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for UCC2800MDREP 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 leader specializing in analog, embedded processing, and high-reliability components for industrial, automotive, aerospace, and defense markets.

The UCC2800-EP product line was designed specifically for extended-temperature, high-reliability power conversion in mission-critical systems-emphasizing controlled baseline manufacturing, enhanced DMS support, and rigorous qualification per JEDEC and MIL-PRF-38535 standards.

FAQ

What is the operating temperature range of the UCC2800MDREP?

The UCC2800MDREP is specified for continuous operation from −55°C to 125°C ambient temperature. This extended range is validated through JEDEC-compliant qualification including HAST, temperature cycling, and bond intermetallic life testing-making it suitable for space, high-altitude, and military vehicle applications where thermal extremes are routine. The M-temp designation explicitly confirms this rating.

Does the UCC2800MDREP require external soft-start circuitry?

No, the UCC2800MDREP includes internal full-cycle soft start implemented as a clamp on the COMP voltage, with a typical rise time of 4–10 ms from 0.5 V to REF − 1 V. This eliminates the need for external RC soft-start networks while ensuring controlled inrush current and preventing transformer saturation during power-up sequences in the UCC2800MDREP-based design.

How does the UCC2800MDREP handle current-sense noise during MOSFET switching?

The UCC2800MDREP uses digital leading-edge blanking to disconnect the CS pin from the current-sense comparator for 50–150 ns immediately after each OUT rising edge. This built-in filtering rejects gate-drive-induced spikes without requiring external RC networks, resulting in lower CS-to-OUT propagation delay than analog filtering methods-and directly improving minimum on-time accuracy in the UCC2800MDREP control loop.

Is the UCC2800MDREP pin-compatible with the UC3842 series?

Yes, the UCC2800MDREP has identical pin configuration and electrical interface to the UC3842 and UC3842A, enabling drop-in replacement in existing layouts. However, the UCC2800MDREP adds internal full-cycle soft start and leading-edge blanking-features absent in the UC3842-so legacy designs benefit from enhanced reliability without PCB changes when upgrading to UCC2800MDREP.

What is the maximum switching frequency supported by the UCC2800MDREP?

The UCC2800MDREP supports operation up to 1 MHz, as stated in its official datasheet. Its oscillator section delivers 40–52 kHz typical frequency (for UCC2800/02/04 variants) when configured with standard RT/CT values, but the architecture allows higher frequencies with optimized external components-enabling compact magnetics and faster transient response in UCC2800MDREP-based power converters.