Texas Instruments UCD7242MRSJREP

Overview

UCD7242MRSJREP from Texas Instruments is a radiation-hardened, dual-channel synchronous-buck power driver IC integrating high-side and low-side NMOS power MOSFETs, gate drivers, current sensing, thermal monitoring, and fault protection in a single 32-pin QFN package. It delivers up to 10 A per channel, supports 2.2–18 V input, operates up to 2 MHz, and features ±5% on-die current sensing - designed for digitally controlled VRMs in defense-grade server and telecom power stages.

For engineers reviewing the UCD7242MRSJREP datasheet, UCD7242MRSJREP pinout, UCD7242MRSJREP application, or UCD7242MRSJREP equivalent, key selection criteria include its military-temperature (–55°C to 125°C) operation, integrated 6.25 V VGG driver supply, dual independent PWM/SRE control, high-side current limit flag, and thermal shutdown at 170°C with hysteresis.

Technical Context

The UCD7242MRSJREP implements two fully independent synchronous-buck power stages, each with dedicated PWM-A/SRE-A/FLT-A/IMON-A/BST-A/BSW-A/SW-A and PWM-B/SRE-B/FLT-B/IMON-B/BST-B/BSW-B/SW-B signal paths. Its gate drivers deliver high peak charge/discharge current to drive internal 15.5 mΩ high-side and 6.5 mΩ low-side NMOS FETs, with programmable dead time (5–11 ns) and blanking (60 ns) to prevent cross-conduction and false overcurrent trips.

It integrates an internally regulated 6.25 V VGG supply (UVLO threshold 4.0 V rising), a 3.3 V BP3 LDO, analog temperature sensing (10 mV/°C, 470 mV offset at 0°C), and dual-channel current monitoring via IMON pins (20 μA/A gain). Operation supports both synchronous (SRE = HIGH) and discontinuous conduction (SRE = LOW) modes per channel, with 3-state PWM detection for safe shutdown.

Key Specifications

Pinout & Package

UCD7242MRSJREP uses a thermally enhanced 32-pin QFN package (6 mm × 6 mm, RSJ code) with exposed thermal pad (PGND-connected) for efficient heat dissipation in high-power density layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel synchronous-buck driver applications.

Compared with LM5143AQRHBRQ1 and TPS53679RSLR, UCD7242MRSJREP provides monolithic integration (FETs + drivers + sensing) for compact, lower-component-count solutions in defense/aerospace applications where radiation tolerance and extended temperature operation are mandatory - but lacks PMBus or automotive qualification.

Availability

UCD7242MRSJREP is available at Aetrix Electronics and suitable for defense electronics, aerospace avionics, and medical imaging systems requiring stable component supply across extended product lifecycles and extreme environmental conditions.

Supply support for UCD7242MRSJREP 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 power management technologies with broad industrial and aerospace design expertise.

The UCD7242MRSJREP belongs to TI's Fusion Digital Power driver family, engineered specifically for high-reliability, digitally controlled synchronous-buck power stages in defense, aerospace, and medical applications demanding extended temperature range and long-term supply assurance.

FAQ

What is the maximum switching frequency supported by the UCD7242MRSJREP?

The UCD7242MRSJREP supports switching frequencies from 300 kHz up to 2 MHz. This range enables designers to optimize trade-offs between magnetic component size, efficiency, and transient response. At 2 MHz, the device maintains stable operation with appropriate layout and external component selection, including proper BST/BSW capacitor placement and low-ESR VGG bypassing.

Does the UCD7242MRSJREP integrate power MOSFETs, or does it require external FETs?

The UCD7242MRSJREP integrates both high-side and low-side NMOS power MOSFETs per channel - 15.5 mΩ high-side and 6.5 mΩ low-side - eliminating the need for external switching devices. This monolithic integration reduces PCB area, simplifies layout, and improves thermal coupling between drivers and FETs compared to controller-plus-FET solutions.

How does the UCD7242MRSJREP handle overcurrent protection?

The UCD7242MRSJREP implements high-side overcurrent protection with a typical trip threshold of 15 A per channel. Upon detection, it immediately turns off the high-side FET and asserts the corresponding FLT-A or FLT-B flag. A 60 ns blanking time prevents false triggering during switching transitions, and fault clearance occurs automatically after one complete fault-free switching cycle.

Can the UCD7242MRSJREP operate with input voltages below 4.75 V?

Yes - the UCD7242MRSJREP can operate down to 2.2 V input when an external 4.75–6.2 V gate drive voltage is supplied to the VGG pin and VGG_DIS is tied to VGG. The internal VGG regulator is disabled in this configuration, allowing compatibility with ultra-low-input power architectures while maintaining full gate drive strength and timing performance.

What is the function of the TMON pin on the UCD7242MRSJREP?

On the UCD7242MRSJREP, the TMON pin outputs a voltage proportional to die temperature (10 mV/°C, 470 mV offset at 0°C), enabling real-time thermal monitoring by the system controller. When die temperature reaches 170°C, the device initiates thermal shutdown - halting switching and asserting FLT - then resumes normal operation only after temperature falls below 150°C due to built-in 20°C hysteresis.