Texas Instruments TPS76550D

Overview

TPS76550D from Texas Instruments is a 5.0-V fixed-output, 150-mA ultra-low-quiescent-current LDO voltage regulator in an 8-pin SOIC package. It delivers 85 mV typical dropout at 150 mA, 35 µA typical ground current over full load range, ±3% output tolerance across –40°C to 125°C, and features open-drain power-good (PG) monitoring - ideal for battery-powered instrumentation requiring long runtime and reliable power sequencing.

For engineers reviewing the TPS76550D datasheet, TPS76550D pinout, TPS76550D application, or TPS76550D equivalent, key selection criteria include its PMOS pass architecture enabling load-independent quiescent current, thermal shutdown protection, enable-controlled sleep mode (<1 µA standby), and stability with low-ESR 4.7-µF output capacitors - all critical for portable medical sensors and low-power IoT edge nodes.

Technical Context

The TPS76550D uses a PMOS pass transistor, eliminating base-drive dependency and ensuring quiescent current remains constant (35 µA typ) from 0 to 150 mA load. Its dropout voltage scales linearly with output current (85 mV typ at 150 mA), enabling operation down to VI = VO + VDO while maintaining regulation.

It integrates an internal 1.224-V reference, open-drain PG comparator with 92–98% VO trip threshold and hysteresis, thermal shutdown at 150°C, and current limiting (~0.8 A). The EN pin accepts TTL-compatible logic (VIH ≥ 2.0 V, VIL ≤ 0.8 V) to enter <1 µA shutdown state with 160 µs wake-up time.

Key Specifications

Pinout & Package

TPS76550D is housed in an 8-pin SOIC (D) package with exposed pad not present; RoHS-compliant, NIPDAU lead finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76550D, TPS76750 offers higher current but doubles quiescent draw and incompatible pinout, while MCP1700T-5002E/MB achieves ultra-low IQ but removes critical system-control features - making TPS76550D optimal for balanced performance in battery-powered instrumentation requiring PG monitoring and enable control.

Availability

TPS76550D is available at Aetrix Electronics and suitable for portable medical sensors, low-power IoT edge nodes, industrial process transmitters, and wearable health monitors requiring stable component supply and long-term lifecycle support.

Supply support for TPS76550D 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 technologies, with decades of expertise in high-reliability power solutions.

The TPS765xx family was designed specifically for ultra-low-power battery-operated systems needing precise, stable voltage regulation with minimal quiescent current - targeting portable instrumentation, wearables, and remote sensing.

FAQ

What is the maximum input voltage rating for the TPS76550D?

The TPS76550D has an absolute maximum input voltage (VI) rating of 13.5 V. However, the recommended operating input voltage range is 2.7 V to 10 V. Exceeding 10 V during normal operation may compromise reliability or trigger internal protection circuits, even if below the absolute maximum limit.

Does the TPS76550D require an external pull-up resistor on the PG pin?

Yes, the TPS76550D PG pin is an open-drain output and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). Typical values range from 10 kΩ to 100 kΩ. Without this resistor, the PG signal cannot assert high and will remain indeterminate, preventing proper power-on reset or fault indication.

Can the TPS76550D operate without an output capacitor?

No, the TPS76550D requires a minimum 4.7-µF output capacitor with ESR between 300 mΩ and 20 Ω for loop stability. Omitting it risks oscillation, poor transient response, or failure to regulate. Ceramic, tantalum, or aluminum electrolytic types are acceptable if ESR and capacitance meet specifications - zero-load operation is supported, but capacitor is mandatory.

What is the thermal shutdown behavior of the TPS76550D?

The TPS76550D activates thermal shutdown at approximately 150°C junction temperature, disabling the output and reducing quiescent current. It automatically recovers when junction temperature falls to ~130°C. This auto-recovery feature prevents latch-up but requires adequate PCB copper area or airflow to ensure safe cooldown during sustained overload conditions.

Is the TPS76550D pin-compatible with other devices in the TPS765xx family?

Yes, all TPS765xx variants - including TPS76515D, TPS76533D, and TPS76550D - share identical 8-pin SOIC (D) packaging and pinout. This allows direct substitution across output voltages without PCB redesign, provided input voltage, load, and thermal constraints remain within specification for the selected variant.