Texas Instruments TPS76628DR

Overview

TPS76628DR from Texas Instruments is a fixed-output, 2.8V, 250mA low-dropout linear voltage regulator in an 8-pin SOIC package. It operates from 2.5V to 16V input, delivers ±1% output accuracy over load and temperature, features open-drain power-good (PG) signaling, and supports stable operation with ≥2.2µF output capacitance - used for biasing MCUs and SiC gate drivers in HVAC control modules.

For engineers reviewing the TPS76628DR datasheet, TPS76628DR pinout, TPS76628DR application, or TPS76628DR equivalent, key selection criteria include dropout voltage at full load (≤540mV), thermal shutdown threshold (173°C), enable logic compatibility (TTL/CMOS), PG trip hysteresis (0.45% V_OUT), and SOIC-8 thermal resistance (126.5°C/W).

Technical Context

The TPS76628DR implements a PMOS pass transistor architecture enabling low quiescent current (55µA typ at no load) and fast transient response. Its internal soft-start (750µs typ) limits inrush current, while the open-drain PG output provides active-high power-status indication with 91–98.5% V_OUT trip threshold and 0.12V output low voltage at 1mA.

It integrates overcurrent limiting (0.725–0.8A typ), thermal shutdown (173°C trip, 157°C reset), and high PSRR (46dB at 1MHz, 58dB at 1kHz), making it suitable for post-regulation of switching supplies where noise rejection and rail stability are critical.

Key Specifications

Pinout & Package

TPS76628DR is housed in an 8-pin SOIC (D) package measuring 4.9mm × 6mm, with exposed pad not present. Thermal resistance is R_θJA = 126.5°C/W (no airflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS76728DR and MCP1702T-2802E/MB, the TPS76628DR uniquely combines PG monitoring, EN control, 46dB PSRR at 1MHz, and SOIC-8 thermal performance - making it optimal for industrial and automotive systems requiring robust power sequencing and noise immunity.

Availability

TPS76628DR is available at Aetrix Electronics and suitable for residential HVAC systems, automotive body electronics, industrial washer/dryer UIs, and SiC gate driver bias circuits requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.

Supply support for TPS76628DR 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.

The TPS766 family was engineered for high-reliability, wide-input LDO regulation in harsh environments - targeting HVAC, appliance, and automotive body electronics where input voltage variation, thermal stress, and noise immunity are critical.

FAQ

What is the maximum input voltage rating for the TPS76628DR?

The TPS76628DR has an absolute maximum input voltage of 18V, with recommended operating range up to 16V. This allows direct use with 12V automotive or industrial rails and transformer-derived supplies without pre-regulation. Exceeding 18V risks permanent damage per Absolute Maximum Ratings.

Does the TPS76628DR require an external feedback resistor network?

No, the TPS76628DR is a fixed-output variant with internal resistor divider set to 2.8V. Pin 1 (NC/FB) is not connected internally and should remain unconnected or tied to GND for improved thermal performance - no external resistors are needed or supported.

What is the dropout voltage specification for the TPS76628DR at full load and high temperature?

The TPS76628DR dropout voltage is specified at ≤540mV when delivering 250mA across –40°C to +125°C. At room temperature and 250mA, typical dropout is 310mV. This ensures regulation from as low as 3.34V input under worst-case conditions.

How does the power-good (PG) function operate on the TPS76628DR?

The TPS76628DR's PG pin is an open-drain output that goes high when V_OUT reaches 91–98.5% of nominal 2.8V, with 0.45% hysteresis. It requires an external pull-up resistor and sinks ≤1mA at 0.12V low-level. This signal enables precise power-on reset timing in systems using the TPS76628DR.

Can the TPS76628DR be used with ceramic output capacitors?

Yes, the TPS76628DR is stable with ceramic output capacitors ≥2.2µF and ESR as low as 0Ω. Unlike older LDOs, it does not require minimum ESR for stability - enabling smaller, more reliable, and lower-cost ceramic-based designs without tantalum or electrolytic alternatives.