Texas Instruments TPS7A0322DQNR

Overview

TPS7A0322DQNR from Texas Instruments is an ultra-low quiescent current (200nA typ) 200mA low-dropout linear regulator in a 1.0mm × 1.0mm X2SON-4 package, delivering fixed 2.2V output with ±1.5% accuracy over –40°C to +125°C. It maintains ultra-low IQ even in dropout and features smart enable pulldown for reliable disable behavior in floating-EN applications such as battery-powered wearables and gas meters.

For engineers reviewing the TPS7A0322DQNR datasheet, TPS7A0322DQNR pinout, TPS7A0322DQNR application, or TPS7A0322DQNR equivalent, key selection criteria include its 270mV max dropout at 200mA (VOUT = 3.3V), <10µs transient settling time, stability with ≥1µF output capacitance, and 3nA shutdown current-critical for multi-year battery life in always-on IoT sensors.

Technical Context

The TPS7A0322DQNR implements a PMOS pass transistor architecture enabling ultra-low dropout and consistent 200nA quiescent current across input voltage (1.5V–6.0V) and load (0–200mA), including dropout operation. Its smart enable circuit integrates a temperature-compensated internal pulldown resistor (~500kΩ at VEN = 0.3V) that ensures reliable disable without external components.

Transient response is optimized via internal compensation stable with 1µF ceramic output capacitors, achieving <10µs settling and only 80mV undershoot during 1mA→50mA load steps. UVLO (1.23–1.47V rising threshold) and thermal shutdown (170°C) provide robust system-level protection.

Key Specifications

Pinout & Package

TPS7A0322DQNR 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 supports automated optical inspection (AOI) and offers low thermal resistance (RθJA = 179.1°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0322DQNR, TPS7A0222PDBVR trades 200mA capability and 1mm² size for lower IQ, while MCP1700T-2202E/TT sacrifices enable functionality and adds 1.4µA static loss-making TPS7A0322DQNR optimal for space-constrained, high-reliability, long-life sensor nodes.

Availability

TPS7A0322DQNR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, residential circuit breakers, and building security sensors requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS7A0322DQNR 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 connectivity technologies with decades of LDO design expertise.

The TPS7A03 family targets ultra-low-power, battery-operated applications demanding nanoscale quiescent current, small footprint, and robust transient performance-especially in medical, industrial, and smart infrastructure sensing nodes.

FAQ

What is the maximum output current capability of the TPS7A0322DQNR?

The TPS7A0322DQNR delivers up to 200mA continuous output current while maintaining regulation and specified transient performance. Its current limit is internally set at 240–750mA depending on output voltage and input conditions, providing robust short-circuit protection without external components. This makes the TPS7A0322DQNR suitable for driving moderate-current peripherals like BLE radios or sensor signal chains in compact battery-powered designs.

Does the TPS7A0322DQNR require an external pull-down resistor on the EN pin?

No, the TPS7A0322DQNR does not require an external pull-down resistor on the EN pin. It integrates a smart enable circuit with a temperature-compensated internal pulldown resistor (~500kΩ at VEN = 0.3V) that actively disables the device when EN is floating or driven low. This feature reduces BOM count, saves PCB area, and eliminates leakage paths that could compromise shutdown current-critical for achieving the device's 3nA typical shutdown IQ.

What output capacitor value is required for stability with the TPS7A0322DQNR?

The TPS7A0322DQNR is stable with a minimum effective output capacitance of 0.5µF, but Texas Instruments specifies 1µF or larger ceramic capacitor for guaranteed stability and optimal transient response. The device's internal compensation is designed for ceramic capacitors with ESR < 10mΩ; using 1µF X7R or better ensures <10µs settling time and 80mV undershoot during 1mA→50mA load steps-key for reliable operation in dynamically loaded IoT endpoints.

How does the TPS7A0322DQNR perform under dropout conditions?

The TPS7A0322DQNR maintains its ultra-low 200nA quiescent current even in dropout-where VIN falls below VOUT + VDO-and delivers regulated 2.2V output until VIN drops to ~1.93V (2.2V × 0.95, per dropout definition). Its PMOS pass element enables this behavior, unlike NMOS-based LDOs that exhibit rising IQ in dropout. This extends usable battery capacity significantly, especially in single-cell alkaline or LiFePO₄ systems where voltage declines gradually over time.

Is the TPS7A0322DQNR compatible with automotive temperature requirements?

Yes, the TPS7A0322DQNR is fully specified for operation from –40°C to +125°C junction temperature, meeting extended industrial and under-hood automotive ambient requirements when properly heatsinked. Its electrical characteristics-including 1.5% output accuracy, 270mV dropout at 200mA, and 3nA shutdown current-are guaranteed across this full range. While not AEC-Q200 qualified, its robust thermal performance and integrated UVLO/thermal shutdown make it suitable for non-safety-critical automotive cabin or body electronics.