Texas Instruments TPS7301QP

Overview

TPS7301QP from Texas Instruments is an adjustable low-dropout (LDO) voltage regulator with integrated delayed reset function, delivering 0–500 mA output current, 1.2–9.75 V programmable output, ±3% output tolerance over load/line/temperature, 340 µA typical quiescent current, and 200-ms active-low reset pulse width. It serves as a precision power supply supervisor in battery-powered microcontroller systems requiring stable voltage regulation and reliable power-on reset.

For engineers reviewing the TPS7301QP datasheet, TPS7301QP pinout, TPS7301QP application, or TPS7301QP equivalent, key selection criteria include its adjustable output range, PMOS pass element enabling ultra-low dropout (e.g., 27 mV at 100 mA for 5-V output), EN-controlled sleep mode (≤0.5 µA), RESET trip threshold of 1.101–1.145 V at FB, and compatibility with standard 8-pin SOIC (P) packaging.

Technical Context

The TPS7301QP uses a PMOS pass transistor to achieve low dropout voltage directly proportional to output current (V_DO = I_O × r_DS(on)), unlike conventional PNP-based LDOs. Its internal precision voltage reference (1.182 V typ at 25°C) feeds a comparator that monitors the FB node to trigger RESET when output falls below the trip threshold.

RESET is an open-drain NMOS output with 200-ms typ timeout after undervoltage recovery; EN enables full shutdown with ≤0.5 µA input current. The device operates across –40°C to 125°C virtual junction temperature and supports input voltages from 2.47 V to 10 V.

Key Specifications

Pinout & Package

TPS7301QP is packaged in an 8-pin plastic DIP (SOIC-8, package code P), with 0.300-inch body width and standard JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable LDO with reset applications.

Compared with TPS7301QP, TPS76301QDR lacks adjustability and current capability, while TLV70710PDQNR omits the integrated 200-ms reset function-making TPS7301QP uniquely suited for space-constrained, single-chip power-supply-and-reset solutions in microcontroller-based systems.

Availability

TPS7301QP is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, automotive body controllers, smart energy meters, and battery-backed data loggers requiring stable component supply and long-term lifecycle support.

Supply support for TPS7301QP 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, specializing in analog, embedded processing, and power management technologies.

The TPS73xx family was designed specifically for microcontroller-based systems needing combined voltage regulation and precise power-on reset functionality in a single IC - targeting battery-operated, automotive, and industrial applications where board space and reliability are critical.

FAQ

What is the minimum input voltage required for stable operation of the TPS7301QP?

The minimum input voltage for TPS7301QP depends on the programmed output voltage and load. For example, at 5-V output and 100 mA load, V_IN(min) = 5 V + 27 mV = 5.027 V. Per datasheet Section 6, the absolute lower limit is 2.47 V - but usable headroom must satisfy V_DO = I_O × r_DS(on), calculated from FB reference and resistor values. TPS7301QP requires careful r_DS(on) selection per Figure 33 for sub-3-V outputs.

How does the RESET function of the TPS7301QP interact with the FB pin?

The RESET output of the TPS7301QP is controlled by an internal comparator monitoring the FB pin voltage. When FB falls below 1.101–1.145 V (trip threshold), RESET asserts low. After recovery, a 200-ms typ timeout begins before RESET deasserts. Since FB is tied to the resistor divider, RESET trip point tracks the programmed output voltage - e.g., 3.3 V output yields ~2.87 V RESET threshold. TPS7301QP's RESET behavior is thus inherently scaled to the configured rail.

Can the TPS7301QP be used without connecting both IN and OUT pins?

Yes, TPS7301QP can operate with only one IN and one OUT pin connected, but doing so forfeits the thermal and conduction benefits of dual-pinning. The datasheet specifies dual IN/OUT pins to reduce effective series resistance and improve power dissipation at full 500 mA load. For ≤200 mA applications, single connections are acceptable; however, PCB layout must maintain low-impedance paths to avoid voltage drop or instability. TPS7301QP's SOIC-8 pinout supports either configuration without modification.

What is the maximum output current capability of the TPS7301QP, and how is it limited?

The TPS7301QP delivers up to 500 mA continuous output current, limited by internal current-limit circuitry that trips at 1.2–2 A (typical 1.2 A at 25°C). Thermal shutdown activates at 165°C junction temperature. Power dissipation must stay within package limits: for SOIC-8 (P), max continuous dissipation is 1175 mW at 25°C, derating to 235 mW at 125°C ambient. Real-world current capability depends on PCB copper area, airflow, and input-output differential - e.g., at 5-V output and 6-V input, 500 mA yields only 500 mW dissipation, staying within safe margins. TPS7301QP's robust current handling makes it suitable for FPGA core supplies and motor driver logic rails.

Does the TPS7301QP support reverse polarity protection or input overvoltage tolerance?

No, the TPS7301QP does not integrate reverse polarity or overvoltage protection. Absolute maximum input voltage is 11 V; operation above this risks permanent damage. Input voltage must remain within 2.47–10 V per recommended conditions. Reverse voltage applied to IN or OUT can cause latch-up or junction breakdown due to lack of internal blocking diodes. External protection - such as a series Schottky diode for reverse polarity or TVS diode for transients - is required in harsh environments. TPS7301QP relies on proper system-level design for fault resilience, as confirmed in Absolute Maximum Ratings (Section 4) of the datasheet.