Texas Instruments TPS79025DBVT

Overview

TPS79025DBVT from Texas Instruments is a 2.5-V, 50-mA ultra-low-power, low-noise LDO voltage regulator in a 5-pin SOT-23 (DBV) package. It features 2.5 V ±2.5% output accuracy over –40°C to 125°C, 57 mV typical dropout at 50 mA, 17 µA quiescent current, and 56 µV_RMS output noise (with 0.01 µF bypass cap). It is used in battery-powered microcontrollers and RF sensor nodes where stable low-noise supply and extended runtime are critical.

For engineers reviewing the TPS79025DBVT datasheet, TPS79025DBVT pinout, TPS79025DBVT application, or TPS79025DBVT equivalent, key selection criteria include its PMOS pass element architecture, enable-controlled 1 µA standby mode, 150-kΩ internal bypass resistor for noise filtering, and strict 4.7 µF minimum output capacitance requirement with 0.2–10 Ω ESR range.

Technical Context

The TPS79025DBVT employs a PMOS pass transistor instead of a conventional PNP, enabling dropout voltage directly proportional to load current and eliminating drive-current dependency on output load. Its internal 150-kΩ resistor at the BYPASS pin forms an RC filter with external capacitor to suppress reference noise.

It integrates thermal shutdown (~165°C trip, ~140°C recovery) and current limiting (~350 mA), supports input voltages from 3.5 V to 10 V, and operates across –40°C to 125°C junction temperature. Enable threshold is ~1.5 V with no hysteresis; logic-high (>1.7 V) disables regulation, reducing ground current to 1 µA.

Key Specifications

Pinout & Package

TPS79025DBVT is housed in a 5-pin SOT-23 (DBV) surface-mount package, 2.9 mm × 1.6 mm × 1.1 mm, JEDEC MO-178 compliant, with gull-wing leads and RoHS-compliant NiPdAu finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79125DBVR, the TPS79025DBVT offers proven noise filtering via BYPASS pin but slightly lower PSRR; versus MCP1700-2502E/TO, it delivers superior noise performance and SMT scalability at the cost of higher BOM complexity and footprint density.

Availability

TPS79025DBVT is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, and portable medical devices requiring stable component supply with traceable sourcing and long-term lifecycle support.

Supply support for TPS79025DBVT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS790xx family was designed specifically for battery-powered portable systems-such as cellular handsets and handheld instruments-where ultralow quiescent current, low output noise, and minimal board area are essential.

FAQ

What is the minimum input voltage required for stable operation of the TPS79025DBVT?

The TPS79025DBVT requires a minimum input voltage of VO(typ) + 1 V = 3.5 V under recommended operating conditions. At 50 mA load, the dropout is 57 mV, so operation is guaranteed down to 2.557 V-but the datasheet specifies 3.5 V minimum to ensure full parameter compliance across temperature and line regulation. Below 3.5 V, output accuracy and transient response may degrade.

Does the TPS79025DBVT require an external bypass capacitor, and why?

Yes, the TPS79025DBVT requires an external ceramic capacitor (0.01–0.1 µF) on the BYPASS pin. This capacitor works with the internal 150-kΩ resistor to form a low-pass filter that attenuates voltage reference noise, directly reducing output spectral noise. Without it, output noise rises significantly-e.g., from 56 µV_RMS to >200 µV_RMS-degrading performance in noise-sensitive analog circuits.

Can the TPS79025DBVT be used with ceramic output capacitors smaller than 4.7 µF?

No. The TPS79025DBVT requires a minimum 4.7 µF output capacitor with ESR between 0.2 Ω and 10 Ω for closed-loop stability. Capacitors smaller than 4.7 µF risk oscillation due to insufficient phase margin-even if ESR is within range. Larger values (e.g., 10 µF) are acceptable and improve transient response, but require careful ESR selection per the stability curves in the datasheet.

How does the enable function behave during power-up of the TPS79025DBVT?

The TPS79025DBVT has no built-in power-on reset or soft-start. When EN transitions from high (>1.7 V) to low (<0.9 V), the output begins regulating after a delay determined by the BYPASS pin RC time constant (150 kΩ × C_BYP). With 0.01 µF, startup is ~1.5 ms; with 0.1 µF, it extends to ~15 ms. Input voltage must reach ≥3.5 V before EN is asserted for valid regulation.

Is the TPS79025DBVT pin-compatible with other members of the TPS790xx family?

Yes, all TPS790xx variants-including TPS79015DBVT, TPS79018DBVT, TPS79025DBVT, TPS79028DBVT, and TPS79030DBVT-share identical 5-pin SOT-23 (DBV) pinout, package dimensions, and terminal functions. Only the output voltage differs; no PCB redesign is needed when swapping between them for voltage-scaling revisions.