UCD3138ARJAT

Overview

The UCD3138ARJAT is a highly integrated digital power controller from Texas Instruments, part of the UCD3138A series. It operates within a supply voltage range of 3 V to 3.6 V and draws a typical operating current of 105 mA. The device supports an output current capability of 30 A and functions reliably across an extended temperature range from -40°C to +125°C. It is housed in a 40-pin VQFN package with dimensions of 6x6 mm, designed for surface mount installation.

Feature Summary

• Integrates a dedicated Error Analog-to-Digital Converter (EADC) for high-speed signal acquisition
• Features a hardware-based PIDa compensator with two poles and two zeros for control loop stability
• Includes a Digital Pulse Width Modulator (DPWM) with 250 ps resolution for precise switching control
• Supports Single Frame functionality for input voltage detection without external optocouplers

Applications

• Isolated DC/DC converters for IT infrastructure
• AC/DC power supplies for network equipment
• Power factor correction circuits
• Communication rectifier systems

Procurement Notes

Verify the specific suffix ARJAT corresponds to the 40-VQFN package variant. Confirm moisture sensitivity level requirements during storage and handling. Ensure compatibility with Code Composer Studio or Fusion Digital Power Designer tools for firmware development. Check RoHS compliance status against project specifications.

Selection Notes

Select this component when a fully programmable digital solution is required for isolated power stages. The UCD3138ARJAT offers superior integration compared to analog controllers by combining control logic, ADC, and PWM on a single chip. Consider its ARM7TDMI-S core capabilities for complex algorithm implementation and PMBus communication needs.

Part Context

This device belongs to the UCD3138 family of digital power controllers. It utilizes a 32-bit ARM7TDMI-S RISC microcontroller core. The architecture is optimized for reducing component count in AC/DC and isolated DC/DC applications. It provides extensive peripheral integration including timers, interrupts, and multiple communication ports.

Replacement Considerations

UCD3138RHAR: Same functional core but different package configuration.

FAQ

How does the Single Frame feature benefit circuit design?

It allows input voltage detection at the transformer secondary side, eliminating the need for additional input undervoltage protection circuits, optocouplers, or digital isolators.

What is the resolution of the DPWM module?

The Digital Pulse Width Modulator provides a pulse width resolution of 250 ps, enabling precise control of the power stage switching timing.