Texas Instruments TPS76427DBVT

Overview

TPS76427DBVT from Texas Instruments is a 2.7-V fixed-output, 150-mA low-noise low-dropout linear regulator in a 5-pin SOT-23 (DBV) package. It delivers 2.7 V ±2.5% over 1–150 mA load, features 50 µV RMS output noise, 300 mV typical dropout at full load, and 85 µA typical quiescent current-enabling extended battery life in portable power rails for RF front-ends and precision analog sensors.

For engineers reviewing the TPS76427DBVT datasheet, TPS76427DBVT pinout, TPS76427DBVT application, or TPS76427DBVT equivalent, key selection criteria include its PMOS pass element architecture, enable-controlled shutdown (<2 µA), bypass-capacitor–enhanced noise filtering, and thermal/current protection for compact, low-power embedded systems.

Technical Context

The TPS76427DBVT uses a PMOS pass transistor instead of conventional PNP, enabling dropout voltage directly proportional to load current and stable 85–140 µA quiescent current across 0–150 mA. Its internal bypass filter (0.01 µF capacitor on BYPASS pin) reduces output noise to 50 µV RMS (300 Hz–50 kHz).

It integrates thermal shutdown (trip at ~165°C, auto-recovery at ~140°C) and current limiting (~0.8–1.5 A), with reverse-current protection via an integrated back diode. The EN pin supports logic-level enable/disable with VIH ≥1.4 V and VIL ≤1.2 V.

Key Specifications

Pinout & Package

TPS76427DBVT is housed in a 5-pin SOT-23 (DBV) surface-mount package (2.9 mm × 1.6 mm × 1.1 mm), optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76427DBVR, the TPS76427DBVT offers identical performance in a smaller reel format ideal for design validation; versus MCP1702T-2702E/MB, it delivers superior noise suppression and lower quiescent current but at lower maximum output current.

Availability

TPS76427DBVT is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, RF transceiver modules, and battery-powered instrumentation requiring stable component supply with guaranteed long-term sourcing.

Supply support for TPS76427DBVT 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 and embedded processing technologies, with leadership in power management ICs and high-reliability components.

The TPS764xx family was designed specifically for battery-operated portable electronics requiring ultra-low noise, low quiescent current, and small-footprint LDO regulation - targeting laptops, cellular handsets, and handheld test equipment.

FAQ

What is the minimum input voltage required for stable operation of the TPS76427DBVT?

The TPS76427DBVT requires a minimum input voltage of VO(typ) + 1 V = 3.7 V, or 2.7 V - whichever is greater. Since 3.7 V > 2.7 V, the practical minimum is 3.7 V under full-load conditions. At lighter loads, dropout decreases proportionally, allowing operation down to ~3.0 V while maintaining regulation. Always verify margin using VI(min) = VO(max) + VDO(max) for your specific load and temperature.

Does the TPS76427DBVT require an external bypass capacitor, and if so, what value is recommended?

Yes, the TPS76427DBVT requires a 0.01 µF ceramic capacitor connected between the BYPASS pin and GND to achieve its specified 50 µV RMS output noise. This capacitor forms an internal low-pass filter; omitting it degrades noise performance significantly. Place it as close as possible to the BYPASS pin with short, low-inductance traces to maintain effectiveness across the 300 Hz–50 kHz noise band.

How does the enable (EN) pin function on the TPS76427DBVT, and what are its voltage thresholds?

The EN pin on the TPS76427DBVT is an active-high logic input. It enables regulation when pulled to ≥1.4 V (VIH) and disables the output when held ≤0.5 V (VIL). In shutdown mode, quiescent current drops to <2 µA at TJ = 25°C. The EN pin draws negligible current (–0.01 to –0.5 µA), allowing direct connection to GPIOs or open-drain logic without pull-up resistors in most cases.

What output capacitor specifications are mandatory for stable operation of the TPS76427DBVT?

The TPS76427DBVT requires a minimum 4.7 µF output capacitor with ESR between 0.2 Ω and 10 Ω. Solid tantalum, aluminum electrolytic, or multilayer ceramic capacitors meeting these criteria are acceptable. For MLCCs, ensure ≥1 µF capacitance is maintained across the full operating temperature range. Using capacitors outside this ESR range risks oscillation or poor transient response - verified in TI's stability region plots (Figures 15–18).

Is the TPS76427DBVT protected against reverse current flow, and how does that protection work?

Yes, the TPS76427DBVT includes reverse-current protection via an integrated back diode across the PMOS pass element. When input voltage falls below output voltage - such as during power-down or rail sequencing - the diode conducts current from OUT to IN, preventing uncontrolled discharge of downstream capacitance. This protection is passive and unconditional, requiring no external components, though sustained reverse voltage may necessitate external current limiting depending on system energy storage.