Texas Instruments TPS77725D

Overview

TPS77725D from Texas Instruments is a 2.5-V fixed-output, 750-mA low-dropout (LDO) voltage regulator with integrated open-drain power-on reset (RESET) output and thermal shutdown protection. It features 260 mV typical dropout at 750 mA, 85 µA typical quiescent current, ±2% output voltage tolerance over line/load/temperature, and stable operation with a 10-µF low-ESR output capacitor. It is used in battery-powered microcontroller systems requiring reliable undervoltage monitoring and clean, regulated 2.5-V supply.

For engineers reviewing the TPS77725D datasheet, TPS77725D pinout, TPS77725D application, or TPS77725D equivalent, key selection considerations include its SOIC-8 package, RESET timing (200 ms delay), PMOS pass transistor architecture enabling ultra-low quiescent current independent of load, and compatibility with standard ceramic, tantalum, and aluminum electrolytic output capacitors meeting 50 mΩ–1.5 Ω ESR requirements.

Technical Context

The TPS77725D employs a PMOS pass element to achieve low dropout and load-independent quiescent current-85 µA across 0–750 mA output range-making it suitable for long-life portable applications. Its internal 1.1834-V reference and precision feedback comparator enable accurate RESET assertion when output falls to 92–98% of nominal (2.3 V–2.45 V), with 0.5% hysteresis.

It operates over −40°C to +125°C junction temperature, supports input voltages from 3.5 V to 10 V (min VIN = VOUT + VDO or 2.7 V, whichever is greater), and delivers fast transient response due to stability with only 10 µF output capacitance. The RESET output is open-drain and requires an external pullup resistor.

Key Specifications

Pinout & Package

TPS77725D is housed in an 8-pin SOIC (D) package with exposed pad not connected internally. Pin 1 is GND; pins 3 and 4 are parallel IN inputs; pins 5 and 6 are parallel OUT outputs; pin 2 is EN (active-high enable); pin 7 is FB/NC (no connect for fixed-output version); pin 8 is open-drain RESET output.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76725D, TPS77725D adds integrated RESET at minimal IQ penalty; compared with TPS7A2025PDBVR, it trades off size and ultra-low IQ for higher current and built-in system supervision-making it optimal for legacy or reset-critical 750-mA applications.

Availability

TPS77725D is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical devices, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS77725D 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 expertise in high-reliability linear regulators and power solutions.

The TPS777xx family was designed specifically for battery-powered and space-constrained systems needing precise voltage regulation, integrated power supervision, and ultra-low quiescent current - targeting portable instrumentation, automotive sub-systems, and industrial edge nodes.

FAQ

What is the minimum input voltage required for TPS77725D to maintain regulation?

The minimum input voltage for TPS77725D is determined by its dropout voltage: at 750 mA load, typical dropout is 260 mV, so minimum VIN = 2.5 V + 0.26 V = 2.76 V. Per datasheet, absolute minimum is 3.5 V due to test condition constraints, but functional regulation begins at ~2.76 V. Always verify with actual load and temperature conditions in your design. TPS77725D maintains regulation down to this point before entering dropout.

Does TPS77725D require an external pullup resistor on the RESET pin?

Yes, TPS77725D features an open-drain RESET output and requires an external pullup resistor (typically 4.7 kΩ–10 kΩ to a valid logic-high voltage like 3.3 V or 5 V). Without it, RESET remains floating and cannot drive downstream reset circuitry. The datasheet specifies leakage current ≤1 µA when pulled to 5 V, confirming safe interfacing with standard CMOS inputs. TPS77725D's RESET behavior is fully defined only with proper pullup.

Can TPS77725D operate without an output capacitor?

No, TPS77725D requires a minimum 10-µF output capacitor with ESR between 50 mΩ and 1.5 Ω for loop stability. Operation without it risks oscillation, poor transient response, or thermal runaway. Ceramic, tantalum, and aluminum electrolytic types are all acceptable if ESR and capacitance meet specs. The datasheet explicitly states "stable with 10 µF low-ESR capacitor" - omitting Co violates recommended operating conditions and invalidates TPS77725D performance guarantees.

What happens to TPS77725D when the EN pin is left unconnected?

Leaving the EN pin unconnected risks undefined behavior: the internal enable circuit has no default state, and stray coupling may cause intermittent shutdown or false enable. Datasheet mandates tying EN to GND (for always-on operation) or to a controlled logic signal. For TPS77725D, EN = 0 V enables regulation; EN ≥ 1.7 V disables it, reducing IQ to 1 µA. Unconnected EN violates recommended practice and may lead to field failures - always terminate TPS77725D's EN pin.

Is TPS77725D pin-compatible with other members of the TPS777xx family?

Yes, all TPS777xx fixed-output variants (e.g., TPS77715D, TPS77718D, TPS77733D) share identical SOIC-8 pinout and terminal functions - only output voltage differs. This allows drop-in replacement across 1.5 V, 1.8 V, 2.5 V, and 3.3 V versions without PCB changes. TPS77725D's pin mapping (GND, EN, IN×2, OUT×2, FB/NC, RESET) is identical across the series, simplifying voltage-scaling design iterations.