Texas Instruments TPS76633DRM3

Overview

TPS76633DRM3 from Texas Instruments is a fixed-output 3.3V, 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 (PG), enable (EN) control, thermal shutdown, and stable operation with ≥2.2µF output capacitance - used for powering MCUs, SiC gate drivers, and industrial control subsystems.

For engineers reviewing the TPS76633DRM3 datasheet, TPS76633DRM3 pinout, TPS76633DRM3 application, or TPS76633DRM3 equivalent, key selection criteria include dropout voltage at full load (260mV typ), PSRR of 46dB at 1MHz, internal soft-start (750µs), and compatibility with low-ESR ceramic capacitors in space-constrained industrial power rails.

Technical Context

The TPS76633DRM3 implements a PMOS pass transistor architecture enabling low dropout and high PSRR. Its feedback loop is internally compensated for fixed 3.3V output, eliminating external resistor networks. The device integrates precision bandgap reference, error amplifier, current-limit protection, and thermal foldback - all operating across –40°C to +125°C junction temperature.

Power-good monitoring uses an internal comparator comparing VOUT against 91–98.5% of nominal output, with 0.45% hysteresis and open-drain output requiring external pull-up. Enable logic accepts TTL-compatible thresholds (VIH = 1.2V min, VIL = 0.4V max), supporting low-power sleep mode with 0.9–6.75µA standby current.

Key Specifications

Pinout & Package

TPS76633DRM3 is housed in an 8-pin SOIC (D) package measuring 4.9mm × 6mm, with standard JEDEC MS-012AC footprint and gull-wing leads. Thermal performance is characterized per JEDEC 2s2p PCB layout (RθJA = 126.5°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76633DRM3, TPS7A4700RGWR offers superior noise performance but requires external resistors and lacks integrated power sequencing; MCP1703T-3302E/MB provides simpler integration and lower IQ but omits critical system-level features like PG and EN, limiting use in complex embedded platforms.

Availability

TPS76633DRM3 is available at Aetrix Electronics and suitable for industrial HVAC systems, automotive body electronics, residential air conditioners, and smart appliance motor control requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for TPS76633DRM3 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 ICs, with decades of expertise in high-reliability industrial and automotive power solutions.

The TPS766 family was designed specifically for robust, wide-input-voltage LDO regulation in harsh environments - targeting applications needing high PSRR, thermal resilience, and integrated power-good signaling without external components.

FAQ

What is the maximum input voltage rating for the TPS76633DRM3?

The TPS76633DRM3 supports an absolute maximum input voltage of 18V, with recommended operating range up to 16V. This allows direct operation from 12V automotive or industrial rails while surviving transient overvoltages such as load dump. Exceeding 18V risks permanent damage per the Absolute Maximum Ratings table.

Does the TPS76633DRM3 require an external feedback resistor network?

No, the TPS76633DRM3 is a fixed-output 3.3V regulator. Pin 1 (FB/NC) is not connected internally and should be left floating or tied to GND for thermal improvement. External resistors are unnecessary - unlike the adjustable TPS76601 variant which uses this pin for voltage setting.

What output capacitor value is required for stable operation of the TPS76633DRM3?

The TPS76633DRM3 is stable with a minimum 2.2µF ceramic output capacitor (X5R/X7R, ≤100mΩ ESR). Using 4.7µF improves transient response and PSRR, especially at higher frequencies. Aluminum or tantalum capacitors are not required, simplifying bill-of-materials and improving long-term reliability.

How does the power-good (PG) output function on the TPS76633DRM3?

The PG pin is an open-drain output that goes high (via external pull-up) when VOUT reaches 91–98.5% of 3.3V and remains asserted with 0.45% hysteresis. It sinks ≤1mA and must be pulled up to a valid logic rail (e.g., 3.3V or 5V). PG asserts after startup delay and de-asserts cleanly during brown-out, enabling precise system reset control.

What is the thermal shutdown behavior of the TPS76633DRM3?

The TPS76633DRM3 activates thermal shutdown at 173°C junction temperature and resets automatically when junction cools to 157°C. During shutdown, output disables, quiescent current drops to ~0.9µA, and PG de-asserts. This hysteresis prevents cycling near the trip point and protects against sustained overload or inadequate heatsinking in enclosed industrial enclosures.