Texas Instruments TPS77833PWP

Overview

TPS77833PWP from Texas Instruments is a 3.3-V, 750-mA fixed-output low-dropout (LDO) voltage regulator with open-drain power-good (PG) output, 260 mV typical dropout at 750 mA, 85 µA typical quiescent current, and ±2% output voltage tolerance over line, load, and temperature. It operates from −40°C to 125°C and is used in battery-powered microcontroller systems requiring stable, low-noise 3.3-V supply with power sequencing feedback.

For engineers reviewing the TPS77833PWP datasheet, TPS77833PWP pinout, TPS77833PWP application, or TPS77833PWP equivalent, key selection criteria include PG assertion threshold (92–98% VO), thermal shutdown at 150°C, compatibility with 10-µF low-ESR output capacitors, and PWP package thermal performance (2.9 W at 0 CFM airflow).

Technical Context

The TPS77833PWP uses a PMOS pass element enabling ultralow, load-independent quiescent current (85 µA typ) and dropout voltage directly proportional to output current. Its internal 1.1834-V reference and error amplifier deliver precise regulation with fast transient response-±50 mV deviation under 1-A load step with 10-µF output capacitance.

Unlike bipolar-based LDOs, it avoids base-current saturation in dropout, maintaining low quiescent current even when VIN approaches VO. The open-drain PG output asserts low when VO drops below 92% of nominal (3.04 V), with 0.5% hysteresis and 200-ms delay for noise immunity during startup or brownout recovery.

Key Specifications

Pinout & Package

TPS77833PWP is housed in a 20-pin HTSSOP (PWP) package with exposed thermal pad (GND/HSINK) for enhanced power dissipation. The package supports up to 2.9 W at 0 CFM airflow on a 1-layer PCB and integrates eight GND/HSINK terminals for low-impedance thermal and electrical return paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS77833PWP, TPS79633DRBR offers higher current and lower IQ but omits true open-drain PG, while MCP1826T-3302E/DB matches PG functionality in smaller SOIC but trades delay time and thermal performance for cost and size.

Availability

TPS77833PWP is available at Aetrix Electronics and suitable for microcontroller power sequencing, portable medical sensor nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS77833PWP 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 qualification expertise.

The TPS778xx family was engineered for high-reliability embedded systems needing precise, low-noise regulation with integrated power monitoring - targeting applications where PG signaling, thermal resilience, and battery efficiency are critical.

FAQ

What is the minimum input voltage required for TPS77833PWP to maintain regulation?

The minimum input voltage for TPS77833PWP is determined by its dropout voltage: at 750 mA load and 25°C, dropout is 260 mV typical, so VIN(min) = 3.3 V + 0.26 V = 3.56 V. Per datasheet Section 6, the absolute minimum VIN is 2.7 V, but regulation is only guaranteed when VIN ≥ VO + VDO - thus 3.56 V is the practical minimum for full-load operation. TPS77833PWP will remain functional down to 2.7 V but may drop out under load.

How does the PG output of TPS77833PWP behave during power-up and brownout events?

The PG output of TPS77833PWP is an open-drain signal that remains high-impedance (floating) until VO reaches 92% of 3.3 V (≈3.04 V), then pulls low after a 200-ms debounce delay. During brownout, PG stays low until VO recovers above 98% (≈3.23 V) due to 0.5% hysteresis. This prevents chatter during marginal voltage conditions and ensures clean reset assertion in systems like microcontrollers and FPGAs.

Can TPS77833PWP operate without an output capacitor?

No - TPS77833PWP requires a minimum 10-µF output capacitor with ESR between 50 mΩ and 1.5 Ω for loop stability, as specified in the datasheet Application Information section. Omitting the capacitor or using one outside this ESR range risks oscillation, excessive overshoot, or failure to regulate. Ceramic, tantalum, and aluminum electrolytic types are acceptable if ESR and capacitance meet these bounds.

What is the thermal performance difference between TPS77833PWP and the SOIC-packaged TPS77833D?

TPS77833PWP (20-pin HTSSOP) delivers significantly better thermal performance than TPS77833D (8-pin SOIC): at 0 CFM airflow, PWP sustains 2.9 W vs. D's 568 mW. This is due to the PWP's eight GND/HSINK pins and exposed thermal pad, enabling direct conduction to PCB copper. For 750-mA loads at 70°C ambient, TPS77833PWP remains within safe junction limits where TPS77833D would require derating or forced air.

Is the FB/NC pin on TPS77833PWP required to be connected?

No - the FB/NC pin (Pin 15) is explicitly designated "no connect" for fixed-output variants like TPS77833PWP. It is internally unused and must be left floating; connecting it to any voltage or ground risks undefined behavior or damage. Only adjustable versions (e.g., TPS77801PWP) use this pin for feedback resistor divider connection.