Texas Instruments TPS7A0318DQNR

Overview

TPS7A0318DQNR from Texas Instruments is an ultra-low quiescent current (200nA typ) 200mA low-dropout linear regulator with fixed 1.8V output, 1.5% accuracy over –40°C to +125°C, and 270mV max dropout at 200mA - designed for battery-powered wearables, gas meters, and medical sensors where nanoscale IQ and fast transient response (<10µs settling, 80mV undershoot) are critical.

For engineers reviewing the TPS7A0318DQNR datasheet, TPS7A0318DQNR pinout, TPS7A0318DQNR application, or TPS7A0318DQNR equivalent, this page delivers verified electrical specs, X2SON-4 package details, smart enable pulldown behavior, thermal performance data, and validated alternatives for ultra-low-power LDO selection in space-constrained, long-life systems.

Technical Context

The TPS7A0318DQNR implements a PMOS pass transistor architecture enabling ultra-low IQ retention even in dropout mode, with internal smart enable logic featuring a temperature-stable 500kΩ pulldown resistor (disconnected during active operation). Its stability requires only ≥1µF ceramic output capacitance and supports input voltages from 1.5V to 6.0V.

Transient response is optimized via internal compensation and low-output-impedance design: load steps from 1mA to 50mA settle within <10µs with ≤80mV undershoot, while UVLO (1.23–1.47V rising threshold, 180mV hysteresis) and thermal shutdown (170°C trip, 145°C reset) ensure robust operation across industrial temperature ranges.

Key Specifications

Pinout & Package

TPS7A0318DQNR is packaged in a 1.0mm × 1.0mm, 4-pin X2SON (DQN) package with wettable flank leads and an exposed thermal pad internally connected to GND. The compact footprint supports high-density PCB layouts in wearables and sensor nodes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current LDO applications.

Compared with TPS7A0318DQNR, TPS7A0218PDBVR offers lower IQ for extreme battery longevity but reduced current drive, while MCP1703T-1802E/MB provides higher output current and input voltage range at the cost of 12.5× higher quiescent current and no integrated enable pulldown - making TPS7A0318DQNR optimal for space-constrained, 200mA-capable, nanoscale-IQ designs.

Availability

TPS7A0318DQNR is available at Aetrix Electronics and suitable for wearable electronics, utility metering, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS7A0318DQNR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS7A03 family is engineered for ultra-low-power, space-constrained applications - specifically targeting battery-operated IoT endpoints, energy-harvesting systems, and safety-critical sensors where nanoscale quiescent current and guaranteed startup under weak input sources are mandatory.

FAQ

What is the maximum input voltage rating for TPS7A0318DQNR?

The absolute maximum input voltage for TPS7A0318DQNR is 6.5V, but the recommended operating range is 1.5V to 6.0V. Exceeding 6.0V may trigger internal UVLO or reduce reliability; operation above 6.0V is not guaranteed per datasheet specifications and risks permanent damage. For designs with variable input sources (e.g., solar-charged batteries), ensure clamping or regulation upstream of TPS7A0318DQNR.

Does TPS7A0318DQNR require an external pull-down resistor on the EN pin?

No, TPS7A0318DQNR does not require an external pull-down resistor on the EN pin. It features a built-in smart enable circuit with a 500kΩ internal pulldown that automatically disconnects when EN is driven high, eliminating external components and reducing board area. This design ensures reliable disable state when EN is left floating - a key advantage over conventional LDOs like MCP1703.

What output capacitor value is required for stability with TPS7A0318DQNR?

TPS7A0318DQNR is stable with a minimum 1µF ceramic output capacitor (X5R/X7R), and the datasheet specifies 1µF as the recommended value for optimal transient response. While 0.5µF is the absolute minimum for basic stability, using ≥1µF ensures <10µs settling time and ≤80mV undershoot during 1mA→50mA load steps - critical for MCU wake-up integrity. Larger values (up to 22µF) are acceptable but offer diminishing returns.

How does the dropout voltage of TPS7A0318DQNR vary with output current and temperature?

At 200mA and 25°C, TPS7A0318DQNR's dropout voltage is ≤450mV (for 1.8V output). Over –40°C to +125°C, max dropout increases to 560mV at 200mA. This variation is characterized in Figure 5-33 and Table 5.5; it remains well below competing 200mA LDOs (e.g., TPS7A02: 650mV max at 100mA), enabling longer runtime from marginal input sources like aging alkaline cells.

Is TPS7A0318DQNR pin-compatible with other members of the TPS7A03 family?

Yes, all TPS7A03 variants in the DQN (X2SON-4) package - including TPS7A0318DQNR (1.8V), TPS7A0333DQNR (3.3V), and TPS7A0350DQNR (5.0V) - share identical pinout (IN, GND, EN, OUT) and footprint. This allows single PCB design reuse across multiple output voltages, reducing layout effort and qualification overhead for product families requiring different rail voltages.