Texas Instruments TPS77625D

Overview

TPS77625D from Texas Instruments is a 2.5V fixed-output, 500mA low-dropout (LDO) voltage regulator with power-good (PG) output, PMOS pass element, 169mV typical dropout at 500mA, ±2% output accuracy over line/load/temperature, and 85µA typical quiescent current. It serves as a core power supply for FPGA I/O rails and DSP core logic in battery-sensitive embedded systems.

For engineers reviewing the TPS77625D datasheet, TPS77625D pinout, TPS77625D application, or TPS77625D equivalent, key selection criteria include PG output timing behavior, 10µF low-ESR capacitor stability requirement, thermal shutdown threshold (150°C), and SOIC-8 package thermal derating (568mW at TA=25°C).

Technical Context

The TPS77625D uses a PMOS pass transistor to achieve ultralow, load-independent quiescent current (85µA typ) and linearly proportional dropout voltage (169mV typ at 500mA). Its internal 1.183V reference feeds a high-impedance feedback amplifier that monitors VOUT via the PG comparator.

PG assertion occurs when VOUT drops to 92–98% of nominal (2.3–2.45V), with 0.5% hysteresis and open-drain output requiring external pull-up. The 200ms delay is implemented via an internal RC network - not programmable - and applies only to power-on reset initiation in TPS775xx variants; TPS77625D does not include RESET functionality.

Key Specifications

Pinout & Package

TPS77625D is packaged in an 8-pin SOIC (D) with exposed pad not present; thermal performance relies on standard copper pour per JEDEC MS-012. Pin 1 is GND, pin 2 is EN (active-low enable), pins 3–4 are IN (dual-input for lower inductance), pin 5–6 are OUT (dual-output for lower impedance), pin 7 is FB/NC (no connect for fixed version), and pin 8 is PG (open-drain power-good).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS77625D, TPS76725 offers lower cost but sacrifices PG functionality and efficiency under load, while MCP1702T-2502E/MB trades current capability and sequencing support for extreme quiescent savings in low-power edge nodes.

Availability

TPS77625D is available at Aetrix Electronics and suitable for FPGA power management, DSP core supply, and industrial sensor interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS77625D 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 broad industrial qualification.

The TPS776xx family was engineered specifically for high-performance digital systems requiring precise, sequenced, and monitored power rails - especially FPGA, DSP, and ASIC applications demanding PG signaling and low-noise regulation.

FAQ

What is the minimum input voltage required for stable operation of the TPS77625D?

The TPS77625D requires a minimum input voltage of 2.669V under full 500mA load, calculated as VOUT + VDO = 2.5V + 0.169V. At lighter loads, VIN may drop to 2.7V per absolute maximum ratings, but regulation is only guaranteed above the dropout threshold. Input below 2.669V causes output collapse without warning - the PG output will assert only after VOUT falls below 92% of 2.5V.

Does the TPS77625D support adjustable output voltage configurations?

No, the TPS77625D is a fixed 2.5V output variant and does not support adjustable operation. The FB pin (Pin 7) is internally disconnected (NC) in this version. For adjustable designs, TI offers the TPS77601, which uses an external resistor divider on the FB pin to set output between 1.2V and 5.5V - but that part has different pinout, package, and PG behavior.

How should the PG pin of the TPS77625D be interfaced in a system?

The PG pin of the TPS77625D is an open-drain output requiring an external pull-up resistor to a valid logic-high voltage (e.g., 3.3V or 5V). A 10kΩ resistor is typical. When VOUT is within 92–98% of 2.5V, PG remains high-impedance (pull-up asserts logic high); when VOUT drops outside that window, PG pulls low. Do not leave PG floating - it must be pulled up or tied to a microcontroller GPIO with internal pull-up enabled.

Can the TPS77625D operate without an output capacitor?

No, the TPS77625D requires a minimum 10µF output capacitor with ESR between 50mΩ and 1.5Ω for loop stability. Omitting COUT causes oscillation and unregulated output. Ceramic, tantalum, or aluminum electrolytic capacitors meeting those ESR specs are acceptable. A 0.1µF ceramic bypass capacitor on the input is recommended if the device is >2 inches from the main supply.

What thermal derating applies to the TPS77625D in SOIC-8 package?

In SOIC-8 (D) package, the TPS77625D has a thermal resistance θ_JA of 227°C/W at TA = +85°C with no airflow. Its maximum power dissipation derates linearly at 5.68mW/°C above +25°C ambient. At +70°C ambient, max dissipation drops to 312mW; at +85°C, it is 227mW. Exceeding these limits risks thermal shutdown or accelerated parametric drift.