Texas Instruments TPS77533PWP

Overview

TPS77533PWP from Texas Instruments is a 3.3V fixed-output, 500mA low-dropout (LDO) voltage regulator with open-drain RESET output, PMOS pass element, 169mV typical dropout at 500mA, ±2% output accuracy over line/load/temperature, and 85µA typical quiescent current. It operates from 2.7V to 10V input and supports FPGA core power, DSP I/O rails, and microcontroller supply sequencing.

For engineers reviewing the TPS77533PWP datasheet, TPS77533PWP pinout, TPS77533PWP application, or TPS77533PWP equivalent, key selection criteria include its 200ms RESET delay, thermal shutdown protection, compatibility with 10µF low-ESR output capacitors, and operation in industrial temperature range (–40°C to +125°C).

Technical Context

The TPS77533PWP uses a PMOS pass transistor enabling ultralow, load-independent quiescent current (85µA typ) and dropout voltage directly proportional to output current (169mV typ at 500mA). Its internal 1.183V reference feeds a high-impedance error amplifier that drives the gate of the PMOS device.

A dedicated comparator monitors VOUT against 92–98% of nominal output; when undervoltage occurs, it asserts the open-drain RESET output after a fixed 200ms delay. The enable input (EN) supports TTL-compatible shutdown, reducing quiescent current to 1µA.

Key Specifications

Pinout & Package

TPS77533PWP is housed in a thermally enhanced 20-pin HTSSOP PowerPAD™ (PWP) package with exposed thermal pad soldered to PCB ground plane for improved heat dissipation. Package dimensions: 6.5mm × 4.4mm × 1.2mm, pitch 0.65mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76333DBVR and TLV70733PDQNR, the TPS77533PWP uniquely combines 500mA delivery, integrated 200ms RESET, and industrial temperature rating - making it the only option among the three qualified for FPGA I/O and DSP system-supply applications requiring both current headroom and hardware reset assurance.

Availability

TPS77533PWP is available at Aetrix Electronics and suitable for FPGA power, DSP I/O supply, and microcontroller system reset applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS77533PWP 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, embedded processing, and power management ICs, with leadership in high-reliability industrial and automotive solutions.

The TPS775xx family was designed specifically for high-performance digital system power rails - delivering fast transient response, precise voltage regulation, and integrated power-good/reset supervision for FPGAs, DSPs, and microcontrollers.

FAQ

What is the maximum input voltage rating for the TPS77533PWP?

The TPS77533PWP has an absolute maximum input voltage (VIN) rating of +13.5V. However, the recommended operating input range is 2.7V to 10V. Exceeding 10V may increase power dissipation and thermal stress without functional benefit, and operation above 13.5V risks permanent damage. Always maintain VIN ≤ VOUT + VDO (≈3.47V minimum) for regulation.

Does the TPS77533PWP require a minimum load current to maintain regulation stability?

No, the TPS77533PWP is stable at zero load. Unlike many older LDOs, it does not require a minimum output current to maintain loop stability or specified performance. This eliminates the need for dummy load resistors and reduces power waste in sleep-mode applications - a key advantage confirmed in TI's application notes and electrical characteristics table.

How is the RESET output of the TPS77533PWP configured and used?

The TPS77533PWP RESET output is an open-drain pin (Pin 16) that pulls low when VOUT falls below 92–98% of 3.3V. It features a fixed 200ms timeout and requires an external pullup resistor (typically 10–100kΩ to 3.3V). It is used to assert hardware reset on microcontrollers or FPGAs during brownout events - a function verified in the functional block diagram and timing diagrams of the official datasheet.

Can the TPS77533PWP be used with ceramic output capacitors, and what ESR range is acceptable?

Yes, the TPS77533PWP is explicitly characterized for stability with 10µF ceramic capacitors. The datasheet specifies an allowable ESR range of 50mΩ to 1.5Ω. Multilayer ceramic capacitors (MLCCs) meeting this ESR window - such as X5R/X7R 1206 or 0805 packages - are fully supported and recommended for compact, high-reliability designs.

What thermal considerations apply to the TPS77533PWP in the PWP package?

The TPS77533PWP in the HTSSOP-20 PowerPAD™ (PWP) package requires the exposed thermal pad to be soldered to a PCB ground plane. With high-K board construction, its thermal resistance θ_JA is 23.5°C/W, allowing ~1.9W max power dissipation at +70°C ambient. Derating is mandatory above +25°C; exceeding +125°C junction temperature triggers thermal shutdown, verified in the Absolute Maximum Ratings and Dissipation Ratings tables.