Texas Instruments TPS77350DGK

Overview

TPS77350DGK from Texas Instruments is a 250-mA, 5.0-V fixed-output low-dropout (LDO) voltage regulator with integrated open-drain power-on reset (RESET) output, 8-pin MSOP (DGK) package, 200-mV typical dropout at 250 mA, 92-µA quiescent current, and ±2% output voltage tolerance over line/load/temperature. It powers microprocessor core logic in battery-operated portable instrumentation.

For engineers reviewing the TPS77350DGK datasheet, TPS77350DGK pinout, TPS77350DGK application, or TPS77350DGK equivalent, key selection criteria include reset delay timing (220 ms), undervoltage trip threshold (95% VO), dropout performance across temperature, stability with 1-µF low-ESR ceramic capacitors, and enable polarity (active-low EN).

Technical Context

The TPS77350DGK uses a PMOS pass element to achieve low dropout and load-independent quiescent current. Its internal 1.183-V reference feeds a high-gain error amplifier that drives the pass transistor to regulate output voltage with fast transient response.

It integrates a precision comparator monitoring regulated output voltage: RESET asserts low when VO falls below 95% of nominal (±0.5% hysteresis), with 220-ms delay after power-up before release. The active-low EN pin enables shutdown mode, reducing ground current to ≤1 µA.

Key Specifications

Pinout & Package

TPS77350DGK is housed in an 8-pin MSOP (DGK) package, 3.0 mm × 3.0 mm × 1.0 mm body, 0.65-mm lead pitch, exposed thermal pad (not electrically connected). Pin 1 is FB/SENSE; pins 5 and 6 are parallel IN inputs; pins 7 and 8 are parallel OUT outputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS77350DGK, TPS76350DBVR trades integrated reset for smaller SOT-23 packaging and higher dropout, while TLV70550YFPR offers lower quiescent current but sacrifices 50 mA output capacity and reset capability-making TPS77350DGK optimal for reset-critical 250-mA embedded systems.

Availability

TPS77350DGK is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, handheld test equipment, and automotive body control units requiring stable component supply, long-term lifecycle support, and guaranteed reset timing behavior.

Supply support for TPS77350DGK 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 designing analog, embedded processing, and connectivity technologies for industrial, automotive, and personal electronics markets.

The TPS773xx family delivers low-noise, reset-integrated LDOs optimized for battery-powered and safety-critical systems where deterministic power-up sequencing and long operational life are essential.

FAQ

What is the exact reset threshold voltage and delay timing for TPS77350DGK?

The TPS77350DGK asserts its open-drain RESET output low when the regulated 5.0-V output falls below 95% × 5.0 V = 4.75 V. After power-up, it holds RESET low for a precise 220-ms delay before releasing to high-impedance once VO reaches and sustains ≥4.75 V. This timing is factory-trimmed and specified over –40°C to 125°C.

Can TPS77350DGK operate with a 5.5-V input supply?

No. The TPS77350DGK requires a minimum input voltage of VO + 1 V = 6.0 V for proper regulation at 5.0 V output. Operating below 6.0 V violates recommended conditions and causes dropout-output voltage will sag proportionally. Absolute maximum input is 10 V; 5.5 V is insufficient and will not sustain 5.0-V regulation under load.

Does TPS77350DGK require an external bypass capacitor for noise reduction?

No. The TPS77350DGK achieves 55 µV_rms output noise (300 Hz–100 kHz) without any external bypass capacitor. This eliminates the need for additional filtering components, saving PCB area and BOM cost while maintaining signal integrity for sensitive analog circuits.

How does the dual IN and dual OUT pin configuration benefit TPS77350DGK designs?

The dual IN (pins 5,6) and dual OUT (pins 7,8) configuration reduces effective trace resistance and inductance, lowering IR drop and improving power supply rejection ratio (PSRR). It also distributes current, reducing thermal stress on individual bond wires and enhancing reliability under sustained 250-mA loads.

What output capacitor types and values are validated for stable operation of TPS77350DGK?

The TPS77350DGK is stable with either 1-µF solid tantalum (low-ESR) or 10-µF X5R/X7R ceramic capacitors. Stability depends on meeting ESR requirements shown in Figures 18–21 of the datasheet-typically 0.1–10 Ω for 1-µF, and <0.1 Ω for 10-µF. Y5U/Z5U ceramics are not recommended due to excessive capacitance drift.