Texas Instruments TPS7A0325DQNR

Overview

TPS7A0325DQNR from Texas Instruments is a nanopower low-dropout voltage regulator delivering 200mA output with ultra-low 200nA quiescent current (typ), 1.5% output accuracy over temperature, and 270mV max dropout at 200mA for 3.3V output. It operates from 1.5V to 6.0V input and provides fixed 2.5V output in a 1.0mm × 1.0mm X2SON-4 package, designed for battery-powered wearables and medical sensors requiring multi-year shelf life.

For engineers reviewing the TPS7A0325DQNR datasheet, TPS7A0325DQNR pinout, TPS7A0325DQNR application, or TPS7A0325DQNR equivalent, key selection criteria include its 3nA shutdown current, <10µs transient settling time under 1mA–50mA load steps, smart enable pulldown resistor, and stability with ≥1µF ceramic output capacitance - all critical for ultra-low-power MCU supply rails and energy-harvesting systems.

Technical Context

The TPS7A0325DQNR implements a PMOS pass transistor architecture enabling ultra-low IQ operation even in dropout, with internal smart enable logic that disconnects the 500kΩ pulldown resistor when EN is driven high. Its fast transient response stems from adaptive biasing and optimized control loop compensation, achieving 80mV undershoot during 1mA→50mA load steps.

It integrates UVLO with 1.3V nominal threshold and 180mV hysteresis, thermal shutdown at 170°C, and foldback current limiting. The device is fully specified from –40°C to +125°C junction temperature and supports output voltages down to 0.8V in 50mV increments - though TPS7A0325DQNR is factory-trimmed to 2.5V.

Key Specifications

Pinout & Package

TPS7A0325DQNR is housed in a 1.0mm × 1.0mm, 4-pin X2SON (DQN) package with wettable flanks and an exposed thermal pad internally connected to GND. The package is optimized for space-constrained wearables and implantables, with 0.4mm pitch and bottom-side thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0325DQNR, TPS7A0225PDBVR offers identical regulation performance but sacrifices nanopower efficiency and integrated enable logic, while MCP1703T-2502E/MB trades ultra-low IQ for lower cost and wider availability - making TPS7A0325DQNR the sole choice for multi-year battery life in space-constrained, safety-aware applications.

Availability

TPS7A0325DQNR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, residential circuit breakers, and portable medical diagnostics requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for TPS7A0325DQNR 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, low-power IC design.

The TPS7A03 family was engineered specifically for ultra-low-power, battery-operated endpoints - prioritizing nanoscale IQ, minimal footprint, and robust protection features for applications where battery replacement is impractical or impossible.

FAQ

What is the maximum output current capability of the TPS7A0325DQNR?

The TPS7A0325DQNR delivers up to 200mA continuous output current. Its current limit is internally set to 240–750mA depending on output voltage and input conditions, with foldback protection engaging above rated load. For reliable 200mA operation at full temperature range, ensure proper PCB thermal design - especially via stitching the thermal pad to a solid ground plane - given its RθJB of 116.3°C/W in the DQN package.

Does the TPS7A0325DQNR require an external pull-down resistor on the EN pin?

No, the TPS7A0325DQNR does not require an external pull-down resistor on the EN pin. It features a smart enable circuit with an internal 500kΩ pulldown resistor that automatically disconnects when EN is driven high, eliminating external components and reducing system-level leakage. This design simplifies layout and improves reliability in space-constrained applications like wearables and medical sensors where the TPS7A0325DQNR is commonly deployed.

What output capacitor value is required for stability with the TPS7A0325DQNR?

The TPS7A0325DQNR is stable with a minimum effective output capacitance of 0.5µF, but a 1µF or larger ceramic capacitor is required for optimal transient response and guaranteed stability across temperature and process variation. TI specifies 1µF as the recommended value in all operating conditions - using smaller values risks instability or excessive output ripple, particularly during fast load transients where the TPS7A0325DQNR's <10µs settling time depends on adequate COUT.

How does the TPS7A0325DQNR perform under input voltage transients?

The TPS7A0325DQNR demonstrates strong line transient immunity: Figure 5-22 shows only 6mV AC-coupled output deviation during a 2.8V→4.8V input step at 200mA load, and Figure 5-24 shows 10mV deviation during a 2.8V→6.0V step. This performance stems from its high PSRR (55dB at 1kHz) and fast internal loop response - critical for maintaining clean 2.5V supply when sharing input rails with noisy switching converters or battery chargers in the same system.

Is the TPS7A0325DQNR compatible with ceramic capacitors having low ESR?

Yes, the TPS7A0325DQNR is explicitly designed and characterized for use with low-ESR ceramic capacitors - including X5R and X7R types - and requires no series resistance for stability. Its internal compensation is optimized for 1µF ceramic output capacitors with ESR as low as 5mΩ. This eliminates the need for damping resistors or bulk electrolytic capacitors, reducing solution size and cost while supporting the fast transient response (<10µs) that defines the TPS7A0325DQNR's performance in battery-powered applications.