Texas Instruments TPS76633DG4

Overview

TPS76633DG4 from Texas Instruments is a fixed-output 3.3V, 250mA low-dropout (LDO) 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), enable (EN) control, and supports stable operation with ≥2.2µF output capacitance - used for powering MCUs, SiC gate drivers, and industrial control subsystems.

For engineers reviewing the TPS76633DG4 datasheet, TPS76633DG4 pinout, TPS76633DG4 application, or TPS76633DG4 equivalent, key selection criteria include dropout voltage at full load (260mV typ), thermal shutdown threshold (173°C), PSRR of 46dB at 1MHz, internal soft-start (750µs), and compatibility with low-ESR ceramic capacitors in space-constrained industrial designs.

Technical Context

The TPS76633DG4 implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR across wide bandwidth. Its feedback loop uses a precision 0.8V reference (new chip variant), supporting tight regulation even under fast load transients up to 250mA.

It integrates EN-controlled sleep mode (standby current ≤6.75µA), open-drain PG with 91–98.5% V_OUT trip hysteresis, and robust protection including overcurrent limiting and thermal shutdown with 16°C hysteresis (173°C trip / 157°C reset).

Key Specifications

Pinout & Package

TPS76633DG4 is housed in an 8-pin SOIC (D) package, 4.9mm × 6mm, with exposed pad not present. Pin functions are validated per TI SLVS237E (March 2024).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76633DG4, the TPS76733QPWPRQ1 adds automotive reliability at the cost of higher IQ and larger SOIC-8 package, while the MCP1703T-3302E/MB trades dropout and thermal robustness for ultra-low standby power in compact SOT-23 layouts.

Availability

TPS76633DG4 is available at Aetrix Electronics and suitable for residential HVAC systems, industrial PLCs, SiC gate driver biasing, and automotive body electronics requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature and load.

Supply support for TPS76633DG4 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS766 family was engineered for high-reliability industrial power management - delivering precise, low-noise, thermally robust LDO regulation where input voltage variability, load transients, and system-level sequencing are critical design constraints.

FAQ

What is the maximum input voltage rating for the TPS76633DG4?

The TPS76633DG4 has an absolute maximum input voltage of 18V, with recommended operating range from 2.5V to 16V. This allows direct use with 12V transformer secondaries and regulated intermediate rails while maintaining safe margin against transients. Exceeding 18V risks permanent damage per TI SLVS237E Absolute Maximum Ratings.

Does the TPS76633DG4 require an external feedback resistor network?

No, the TPS76633DG4 is a fixed-output 3.3V regulator. Pin 1 (NC/FB) is not connected internally and should be left open or tied to GND for improved thermal performance. External resistors are only required for adjustable versions like TPS76601; using them with TPS76633DG4 provides no functional benefit and may impair thermal behavior.

What output capacitor value is required for stable operation of the TPS76633DG4?

The TPS76633DG4 is stable with a minimum 2.2µF ceramic output capacitor (X5R/X7R), as confirmed in TI's Electrical Characteristics and Typical Characteristics sections. Larger values (e.g., 4.7µF–47µF) improve transient response and PSRR but are not required for basic stability. Avoid electrolytics unless ESR is tightly controlled - ceramic is preferred.

How does the power-good (PG) output function on the TPS76633DG4?

The PG pin on the TPS76633DG4 is an open-drain output that goes high (via external pull-up) when VOUT reaches 91–98.5% of nominal 3.3V and remains asserted until VOUT falls below that threshold. It provides hysteresis (0.45% of VOUT) to prevent chatter during marginal conditions. PG is used for processor reset assertion or system power sequencing control.

Is the TPS76633DG4 pin-compatible with earlier TPS766xx variants?

Yes, all TPS766xx devices - including legacy and new-chip variants - share identical 8-pin SOIC (D) packaging and pinout. The TPS76633DG4 maintains mechanical and electrical pin compatibility with predecessors like TPS76633DRG4, though electrical specs (e.g., dropout, PSRR, accuracy) reflect the newer silicon revision per TI SLVS237E revision history.