Texas Instruments UCC2803MDREP

Overview

UCC2803MDREP from Texas Instruments is a radiation-hardened, extended-temperature-range current-mode PWM controller IC designed for battery-operated DC-DC converters and low-input-voltage offline power supplies. It features 100% maximum duty cycle, 4 V internal reference voltage, 4.1 V UVLO turn-on threshold, −55°C to 125°C operating range, and 1 A totem-pole gate driver output - enabling compact, high-efficiency flyback and forward converter designs in aerospace and industrial systems.

For engineers reviewing the UCC2803MDREP datasheet, UCC2803MDREP pinout, UCC2803MDREP application, or UCC2803MDREP equivalent, key selection considerations include its low 4 V reference (optimized for battery systems), extended temperature qualification, internal leading-edge blanking, full-cycle soft start, and SOIC-8 package compatibility with UC3842/UC3842A layouts.

Technical Context

The UCC2803MDREP implements fixed-frequency current-mode control with an integrated 2 MHz error amplifier, digital leading-edge blanking on the CS pin (50–150 ns), and internal soft-start clamping of the COMP node. Its oscillator operates at 26–36 kHz (typ. 31 kHz) using external RC timing components and supports direct drive of power MOSFET gates via a 1 A peak-sink/source totem-pole output stage.

It uses BICMOS process technology to achieve ultra-low quiescent supply current (100 μA typical start-up, 500 μA typical operating), precise 1.5% reference tolerance, and robust undervoltage lockout with 0.5 V hysteresis (4.1 V ON / 3.6 V OFF), making it suitable for mission-critical power conversion where input voltage stability and thermal resilience are essential.

Key Specifications

Pinout & Package

UCC2803MDREP is housed in an 8-pin plastic SOIC (D package), 3.9 mm × 4.9 mm body, 1.75 mm max height, JEDEC MS-012 compliant, with gull-wing leads and NIPDAU lead finish. Pin 1 orientation marked by notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC2803QDREP and UC3842B, the UCC2803MDREP uniquely delivers −55°C operation, internal soft start, and digital CS blanking in a pin-compatible SOIC-8 package - making it the sole choice for new designs requiring extended temperature resilience and reduced external component count.

Availability

UCC2803MDREP is available at Aetrix Electronics and suitable for avionics power supplies, industrial battery backup systems, and space-qualified point-of-load converters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for UCC2803MDREP 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 delivering analog and embedded processing solutions for industrial, automotive, and aerospace applications.

The UCC280x-EP product line was developed specifically for high-reliability, extended-temperature environments - targeting aerospace, defense, and critical infrastructure systems where long-term supply assurance and rigorous qualification are mandatory.

FAQ

What is the operating temperature range of the UCC2803MDREP?

The UCC2803MDREP is specified for continuous operation from −55°C to +125°C ambient temperature. This extended range is achieved through enhanced manufacturing controls, qualification testing including HAST and temperature cycling, and controlled baseline production - making it suitable for deployment in spacecraft, downhole tools, and military vehicle electronics where thermal extremes are routine.

Does the UCC2803MDREP require an external soft-start circuit?

No, the UCC2803MDREP integrates full-cycle soft start implemented as a voltage clamp on the COMP pin, with a typical rise time of 4–10 ms when FB is held at 1.8 V. This eliminates the need for external timing capacitors or resistors, simplifying board layout and improving startup repeatability across temperature and unit-to-unit variation in the UCC2803MDREP design.

How does the UCC2803MDREP handle current-sense noise during switching transitions?

The UCC2803MDREP incorporates digital leading-edge blanking on the CS pin, disabling the current-sense comparator for 50–150 ns after each OUT rising edge. This hardware-based filtering rejects switch-node ringing and gate-drive coupling artifacts without requiring external RC networks - preserving fast fault response while eliminating analog filter-induced delays in the UCC2803MDREP current protection path.

Is the UCC2803MDREP pin-compatible with the UC3842 family?

Yes, the UCC2803MDREP uses identical pinout, pin function mapping, and SOIC-8 package dimensions as the UC3842 and UC3842A. This allows direct replacement in legacy designs without PCB modifications, while adding value through lower quiescent current, internal soft start, leading-edge blanking, and extended temperature capability in the UCC2803MDREP implementation.

What is the purpose of the REF pin on the UCC2803MDREP?

The REF pin provides a stable 4.0 V ±1.5% reference output used for error amplifier biasing and internal logic. It must be bypassed with ≥0.1 μF ceramic capacitor to GND. When VCC exceeds 1 V, REF is active and can serve as a logic-level power-good signal; below 1 V, it is pulled to GND via a 5 kΩ resistor - enabling simple system status monitoring in UCC2803MDREP-based power architectures.