Texas Instruments TPS7A02185DQNR

Overview

TPS7A02185DQNR from Texas Instruments is an ultra-low-quiescent-current LDO voltage regulator delivering 200 mA output with 25 nA typical IQ, 1.85 V fixed output, 270 mV max dropout at 200 mA (VOUT = 3.3 V), and <10-µs transient settling time - designed for battery-powered wearables and medical sensors requiring multi-year shelf life and fast load-step response.

For engineers reviewing the TPS7A02185DQNR datasheet, TPS7A02185DQNR pinout, TPS7A02185DQNR application, or TPS7A02185DQNR equivalent, key selection criteria include ultra-low shutdown current (3 nA), smart enable pulldown (500 kΩ internal resistor), 1.5% output accuracy over –40°C to +125°C, stability with ≥1 µF ceramic output capacitor, and compatibility with 1.5–6.0 V input range.

Technical Context

The TPS7A02185DQNR implements a PMOS pass transistor architecture enabling ultra-low IQ in dropout and near-zero shutdown current. Its smart enable circuit integrates a temperature-stable 500 kΩ internal pulldown resistor that ensures reliable disable state without external components while minimizing leakage during active operation.

Transient performance is optimized via high-gain error amplifier and low-output-impedance design, achieving <10-µs settling with ≤100-mV undershoot for 1 mA → 50 mA load steps. It operates across –40°C to +125°C junction temperature with full electrical specification including line/load regulation, PSRR (55 dB @ 1 kHz), and UVLO (1.3 V typ with 180 mV hysteresis).

Key Specifications

Pinout & Package

TPS7A02185DQNR uses the DQN package: 1.0-mm × 1.0-mm, 4-pin X2SON with exposed thermal pad (internally connected to GND). Pin 1 = OUT, Pin 2 = GND, Pin 3 = EN, Pin 4 = IN. Thermal pad must be soldered to a large-area ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A03185DQNR, the TPS7A02185DQNR delivers 100 mA more output current at only modest IQ penalty, making it optimal for mixed-signal systems with bursty RF or sensor loads; versus MCP1703T-1802E/MB, its 25 nA IQ enables decade-scale battery operation where µA-level regulators would deplete cells in months.

Availability

TPS7A02185DQNR is available at Aetrix Electronics and suitable for wearable electronics, smart utility meters, residential circuit protection, and wireless sensor nodes requiring stable component supply across long-lifecycle industrial programs.

Supply support for TPS7A02185DQNR 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 broad industrial, automotive, and consumer design expertise.

The TPS7A02 family targets ultra-low-power battery-operated applications demanding nanowatt quiescent current, fast transient response, and extended temperature operation - particularly in medical, metering, and IoT edge devices.

FAQ

What is the maximum input voltage rating for the TPS7A02185DQNR?

The TPS7A02185DQNR has an absolute maximum input voltage of 6.5 V, with recommended operating range from 1.5 V to 6.0 V. Exceeding 6.5 V risks permanent damage. Operation above 6.0 V is not guaranteed per specifications and may degrade long-term reliability or cause overvoltage stress on internal circuitry.

Does the TPS7A02185DQNR require an external pull-down resistor on the EN pin?

No, the TPS7A02185DQNR features a built-in smart enable pulldown resistor of approximately 500 kΩ, which actively holds the EN pin low when floating. This eliminates the need for an external pull-down resistor, reducing BOM count and PCB area - a key advantage in miniaturized designs like wearables and sensor nodes.

What output capacitor value is required for stability with the TPS7A02185DQNR?

The TPS7A02185DQNR is stable with a minimum effective output capacitance of 0.5 µF, but a 1 µF or larger ceramic capacitor is recommended for optimal transient response and noise suppression. The capacitor must be placed as close as possible to the OUT and GND pins to minimize parasitic inductance and ensure robust performance under dynamic load conditions.

How does the TPS7A02185DQNR perform in dropout condition?

In dropout, the TPS7A02185DQNR maintains its ultra-low 25 nA typical quiescent current - unlike conventional LDOs whose IQ rises sharply near dropout. This behavior preserves battery energy during end-of-life voltage sag, extending usable runtime in applications such as smoke detectors and remote sensors powered by aging primary cells.

Is the TPS7A02185DQNR qualified for automotive applications?

The TPS7A02185DQNR is specified for operation from –40°C to +125°C junction temperature and meets industrial reliability standards, but it is not AEC-Q100 qualified. It is suitable for under-hood-adjacent or cabin applications where full automotive qualification is not mandated, such as smart HVAC controls or infotainment auxiliary rails - however, for safety-critical ADAS or powertrain systems, AEC-Q100-compliant alternatives should be selected.