Texas Instruments TPS77633PWP

Overview

TPS77633PWP from Texas Instruments is a 3.3V fixed-output, 500mA low-dropout (LDO) voltage regulator with power-good (PG) output, PMOS pass element, 169mV typical dropout at 500mA, ±2% output voltage tolerance over line/load/temperature, and 85µA typical quiescent current. It operates from 2.7V to 10V input and delivers stable core voltage for FPGA I/O banks and DSP subsystems.

For engineers reviewing the TPS77633PWP datasheet, TPS77633PWP pinout, TPS77633PWP application, or TPS77633PWP equivalent, key selection criteria include PG assertion threshold (92–98% VOUT), thermal shutdown at 150°C, SOIC-8/TSSOP-20 package compatibility, and 10µF low-ESR output capacitor stability requirement.

Technical Context

The TPS77633PWP implements a PMOS-based LDO architecture with voltage-driven gate control, enabling ultralow and load-independent quiescent current (85µA typ). Its internal 1.183V reference feeds a high-impedance feedback amplifier that monitors regulated output via dedicated FB/NC pin in adjustable variants-though TPS77633PWP uses fixed 3.3V configuration.

Power-good (PG) functionality relies on an internal comparator with 200ms delay and 0.5% hysteresis, asserting active-high when VOUT exceeds 92% of nominal and deasserting below 98%. The device supports fast transient response with 10µF low-ESR (50mΩ–1.5Ω) ceramic/tantalum output capacitors and includes thermal shutdown and current limiting (1.2–1.9A).

Key Specifications

Pinout & Package

TPS77633PWP is housed in a 20-pin HTSSOP PowerPAD™ (PWP) package with exposed thermal pad soldered to PCB ground plane for enhanced heat dissipation. Pin count, layout, and thermal design comply with JEDEC MO-153 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS77633PWP, TPS76333DBVR offers smaller footprint but insufficient current for FPGA/DSP loads, while LP38691SD-3.3 matches current capability but omits PG signaling - making TPS77633PWP uniquely suited for systems requiring both high-current 3.3V regulation and hardware-monitored power integrity.

Availability

TPS77633PWP is available at Aetrix Electronics and suitable for FPGA power delivery, DSP subsystems, industrial PLC I/O modules, and portable medical sensor designs requiring stable component supply and long-term manufacturability.

Supply support for TPS77633PWP 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 LDO design heritage and automotive-grade reliability validation.

The TPS776xx family was engineered for high-performance, low-noise power regulation in mixed-signal systems - targeting FPGA, DSP, and industrial control applications where PG monitoring, low dropout, and thermal robustness are essential.

FAQ

What is the maximum input voltage rating for the TPS77633PWP?

The TPS77633PWP has an absolute maximum input voltage rating of +13.5V. However, its recommended operating input voltage range is 2.7V to 10V. Exceeding 10V may compromise long-term reliability and is outside the validated specification range defined in the SLVS232J datasheet. Always maintain VIN within this window for guaranteed performance and lifetime compliance.

Does the TPS77633PWP require an external pull-up resistor on the PG pin?

Yes, the TPS77633PWP PG pin is an open-drain output and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3V or 5V). Typical values range from 10kΩ to 100kΩ. Without this pull-up, the PG signal cannot assert high and will remain indeterminate, preventing proper power sequencing or status indication in systems relying on this feature.

Can the TPS77633PWP operate without an output capacitor?

No, the TPS77633PWP requires a minimum 10µF output capacitor with ESR between 50mΩ and 1.5Ω for loop stability. Omitting it causes oscillation and regulation failure. Ceramic, tantalum, or aluminum electrolytic types meeting these ESR criteria are acceptable. The device is unstable with zero-load or no-capacitor conditions despite low quiescent current claims.

What is the thermal performance difference between the PWP and D packages for the TPS77633PWP?

The TPS77633PWP in HTSSOP-20 (PWP) achieves up to 57.9mW/°C derating with high-K PCB layout (8-layer, full ground planes), delivering ~3.2W max power dissipation at TA = +25°C. In contrast, the SOIC-8 (D) package provides only 9.04mW/°C derating and ~0.9W max dissipation - making PWP essential for sustained 500mA operation at elevated ambient temperatures.

How does the TPS77633PWP behave during input voltage dropout?

During input dropout, the TPS77633PWP maintains ultralow quiescent current (85µA typical) and continues regulating until VIN falls below VOUT + VDO (~3.469V). Unlike bipolar LDOs, its PMOS pass element avoids saturation, preventing surge currents. Once dropout occurs, output follows input minus VDO until PG deasserts at ~3.234V, providing graceful degradation without latch-up or excessive heating.