Texas Instruments TPS76618DRG4

Overview

TPS76618DRG4 from Texas Instruments is a fixed-output 1.8V, 250mA low-dropout linear voltage regulator in an 8-pin SOIC package. It supports 2.5V–16V input, delivers ±1% output accuracy over load and temperature, features open-drain power-good signaling, and is used to power microcontrollers and SiC gate drivers in HVAC and appliance control systems.

For engineers reviewing the TPS76618DRG4 datasheet, TPS76618DRG4 pinout, TPS76618DRG4 application, or TPS76618DRG4 equivalent, key selection criteria include dropout voltage at full load (270mV typ), thermal shutdown threshold (173°C), PSRR at 1MHz (46dB), soft-start time (750µs), and compatibility with ≥2.2µF ceramic output capacitors.

Technical Context

The TPS76618DRG4 implements a PMOS pass transistor architecture enabling low dropout and stable operation with small output capacitance. Its internal feedback loop uses a 0.8V reference for fixed 1.8V output, and it integrates enable-controlled sleep mode with 0.9µA typical standby current.

Power-good logic monitors output voltage with 91–98.5% trip threshold hysteresis and requires external pull-up. The device includes overcurrent limiting (0.725–0.8A) and thermal protection, and its PSRR exceeds 58dB at 1kHz and 46dB at 1MHz under 250mA load.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (D), 4.9mm × 6mm body size with standard lead pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76618DRG4, TPS76618DRG4 offers integrated power-good and higher input voltage tolerance, while TPS76718 sacrifices monitoring for slightly lower cost and MCP1700T-1802E/OT trades input range and thermal headroom for ultra-low IQ and miniaturization.

Availability

TPS76618DRG4 is available at Aetrix Electronics and suitable for residential air conditioners, HVAC systems, and washers and dryers requiring stable component supply across extended production lifecycles.

Supply support for TPS76618DRG4 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 specializing in analog and embedded processing technologies with broad industrial and automotive product portfolios.

The TPS766 family is designed for high-reliability, wide-input-voltage LDO regulation in appliance, HVAC, and industrial control applications where input rails vary from transformer secondaries or unregulated supplies.

FAQ

What is the maximum input voltage rating for the TPS76618DRG4?

The TPS76618DRG4 has an absolute maximum input voltage of 18V, with recommended operating range up to 16V. This allows direct connection to 12V transformer secondaries or regulated intermediate rails without external clamping, supporting robust operation in HVAC and appliance environments where input transients may occur.

Does the TPS76618DRG4 require an external feedback resistor network?

No, the TPS76618DRG4 is a fixed-output 1.8V regulator. Pin 1 (FB/NC) is not internally connected and should be left open or tied to GND for improved thermal performance. External resistors are only required for adjustable versions like TPS76601.

What output capacitor value is required for stable operation of the TPS76618DRG4?

The TPS76618DRG4 is stable with a minimum 2.2µF ceramic output capacitor. Unlike legacy LDOs requiring larger tantalum types, this low-ESR requirement reduces cost, size, and improves transient response-ideal for space-constrained appliance control boards.

How does the power-good (PG) function operate on the TPS76618DRG4?

The TPS76618DRG4 PG pin is an open-drain output that goes high when VOUT reaches 91–98.5% of 1.8V. It requires an external pull-up resistor to a valid logic rail. This signal can drive a microcontroller reset pin or low-battery indicator, providing deterministic power sequencing without external comparators.

What is the thermal shutdown behavior of the TPS76618DRG4?

The TPS76618DRG4 activates thermal shutdown at 173°C junction temperature and resets at 157°C (16°C hysteresis). This protects against sustained overload or inadequate heatsinking in enclosed appliance enclosures, and recovery occurs automatically once temperature falls below the reset threshold.