Texas Instruments TPS77733PWP

Overview

TPS77733PWP from Texas Instruments is a 3.3-V, 750-mA low-dropout (LDO) voltage regulator with integrated open-drain power-on reset (RESET) output and thermal shutdown protection. It features a typical dropout voltage of 260 mV at 750 mA, 85 µA quiescent current, ±2% output voltage tolerance over line/load/temperature, and operates in −40°C to 125°C junction temperature range. It powers microcontroller core logic in battery-backed industrial controllers.

For engineers reviewing the TPS77733PWP datasheet, TPS77733PWP pinout, TPS77733PWP application, or TPS77733PWP equivalent, key selection criteria include dropout performance at full load, RESET timing accuracy (200 ms delay), thermal dissipation capability in PWP package, and compatibility with 10-µF low-ESR output capacitors for stable transient response.

Technical Context

The TPS77733PWP uses a PMOS pass element enabling ultra-low, load-independent quiescent current (85 µA typ) and linearly proportional dropout voltage (260 mV @ 750 mA). Its internal 1.1834-V reference and precision comparator drive the open-drain RESET output when regulated output falls below 92–98% VO.

It achieves fast transient response with only a 10-µF low-ESR output capacitor and supports stable operation down to zero load. The RESET function includes 200-ms delay and hysteresis (0.5% VO) to prevent chatter during brownout recovery.

Key Specifications

Pinout & Package

TPS77733PWP is housed in a 20-pin HTSSOP (PWP) package with exposed thermal pad (PowerPAD™) for enhanced heat dissipation. The package supports up to 2.9 W at 0 CFM airflow (1-layer PCB) and requires soldering the GND/HSINK pins (1, 2, 9, 10, 11, 12, 19, 20) to a copper heatsink area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS77733PWP, TPS76733PWP offers marginally lower quiescent current but omits RESET functionality entirely, while TPS7A4701RGWR delivers superior noise and drift performance at the cost of design complexity and lack of integrated reset - making TPS77733PWP optimal for cost-sensitive, safety-critical embedded systems needing both regulation and reliable power-good signaling in one device.

Availability

TPS77733PWP is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, automotive body electronics, and test equipment requiring stable component supply with full lifecycle support.

Supply support for TPS77733PWP 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS777xx family was designed specifically for battery-powered and thermally constrained embedded systems requiring high-current LDO regulation with integrated power-monitoring and robust thermal protection.

FAQ

What is the minimum input voltage required for TPS77733PWP to maintain regulation?

The minimum input voltage for TPS77733PWP is VO + VDO = 3.3 V + 260 mV = 3.56 V at 750 mA load and 25°C. Per datasheet Section 6, the absolute minimum VIN is also specified as 2.7 V, but actual dropout-limited minimum is higher. At −40°C or 125°C, dropout increases to ~427 mV, raising minimum VIN to ~3.73 V under full load.

Does TPS77733PWP require an external pullup resistor on the RESET pin?

Yes, TPS77733PWP has an open-drain RESET output and requires an external pullup resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). Typical values range from 10 kΩ to 100 kΩ. Leaving RESET floating is acceptable if unused, but no pullup means the signal remains undefined and cannot drive reset logic.

Can TPS77733PWP operate without an output capacitor?

No. TPS77733PWP requires a minimum 10-µF output capacitor with ESR between 50 mΩ and 1.5 Ω for loop stability. Operation without Co risks oscillation and failure to regulate. Ceramic, tantalum, or aluminum electrolytic capacitors meeting these specs are supported - zero-load operation is permitted once Co is installed.

What is the thermal performance difference between TPS77733PWP and the SOIC-packaged TPS77733D?

TPS77733PWP (HTSSOP-20 with PowerPAD™) has a thermal resistance of 23.5 mW/°C derating factor (0 CFM), enabling 2.9 W max power dissipation at TA < 25°C. In contrast, TPS77733D (SOIC-8) is limited to 568 mW under same conditions - a >5× improvement in thermal capacity, critical for high-current or high-ambient applications.

Is TPS77733PWP pin-compatible with other members of the TPS777xx family?

Yes, all TPS777xx variants in the PWP package share identical pinout and footprint, including TPS77715PWP, TPS77718PWP, TPS77725PWP, and TPS77701PWP. This allows drop-in replacement across output voltages or adjustable configurations without PCB redesign - provided EN, RESET, and thermal layout constraints are observed.