Texas Instruments TPS77525D

Overview

TPS77525D from Texas Instruments is a 2.5V fixed-output, 500mA low-dropout (LDO) voltage regulator with open-drain RESET output, PMOS pass element, 169mV typical dropout at 500mA, ±2% output accuracy over line/load/temperature, and 85µA typical quiescent current. It operates from 2.7V to 10V input and supports FPGA core power, DSP I/O rails, and battery-powered microcontroller systems.

For engineers reviewing the TPS77525D datasheet, TPS77525D pinout, TPS77525D application, or TPS77525D equivalent, key selection criteria include RESET timeout delay (200ms), dropout behavior under load, thermal shutdown threshold (150°C), and compatibility with 10µF low-ESR output capacitors for fast transient response.

Technical Context

The TPS77525D uses a PMOS pass transistor enabling ultralow, load-independent quiescent current (85µA typ) and linearly proportional dropout voltage (169mV typ at 500mA). Its internal 1.183V reference and precision feedback comparator drive the open-drain RESET output when VOUT falls below 92–98% of nominal.

Stability is achieved with ≥10µF output capacitance and ESR between 50mΩ and 1.5Ω. The device features thermal shutdown (150°C trip), current limiting (~1.7A), and enable-controlled sleep mode reducing IQ to 1µA - all critical for portable and thermally constrained embedded designs.

Key Specifications

Pinout & Package

TPS77525D is packaged in an 8-pin SOIC (D package), with exposed pad not present. Pin 1 is GND; pins 3 and 4 are IN; pins 5 and 6 are OUT; pin 2 is EN (active-low enable); pin 7 is FB/NC (no connect on fixed-output version); pin 8 is RESET (open-drain, requires external pullup).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76325DBVR and TLV70225DBVR, the TPS77525D delivers higher output current (500mA), lower dropout (169mV), and dedicated open-drain RESET - making it optimal for FPGA/DSP I/O and supervised microcontroller systems where headroom, accuracy, and reset reliability are critical.

Availability

TPS77525D is available at Aetrix Electronics and suitable for FPGA core power, DSP I/O voltage regulation, and battery-powered microcontroller systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS77525D 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, embedded processing, and digital signal technologies, with decades of leadership in power management ICs.

The TPS775xx family was designed specifically for high-performance, low-power applications demanding precise voltage regulation, fast transient response, and integrated power-supervision features in space-constrained industrial and portable systems.

FAQ

What is the minimum input voltage required for stable operation of the TPS77525D?

The TPS77525D requires VIN ≥ VOUT + VDO, where VDO is 169mV typical at 500mA. With a 2.5V output, the minimum valid input is 2.669V. However, the absolute minimum specified VIN is 2.7V per datasheet - ensuring margin for worst-case dropout and line regulation. Below 2.7V, regulation is not guaranteed, and RESET may assert.

Does the TPS77525D require an external pull-up resistor on the RESET pin?

Yes, the TPS77525D RESET pin is open-drain and must be pulled up externally (typically 10–100kΩ to VCC or another logic rail) to generate a valid high-level signal. Without a pull-up, RESET remains floating and cannot drive microcontroller reset inputs. The datasheet specifies 0.15–0.4V low-level output voltage when asserted.

Can the TPS77525D be used with ceramic output capacitors?

Yes, the TPS77525D is stable with ceramic output capacitors provided they meet the 10µF minimum capacitance and 50mΩ–1.5Ω ESR requirements. Multilayer ceramic capacitors (MLCCs) with appropriate voltage rating and case size (e.g., 1206, 1210) are commonly used and reduce board area versus tantalum alternatives.

What happens to the TPS77525D output during thermal shutdown?

When the TPS77525D junction temperature exceeds ~150°C, thermal shutdown activates and forces the output into high-impedance state - effectively disconnecting the load. Output voltage collapses, and RESET asserts. Once the die cools to ~130°C, regulation resumes automatically without requiring an enable toggle or power cycle.

Is the TPS77525D pin-compatible with other members of the TPS775xx family?

Yes, all TPS775xx devices in the SOIC-8 (D) package share identical pinout and footprint, including TPS77515D, TPS77533D, and TPS77501D. This allows direct substitution for different fixed outputs (1.5V, 2.5V, 3.3V, adjustable) without PCB redesign - simplifying BOM rationalization and design reuse.