Texas Instruments TPS7A0518PDQNR

Overview

TPS7A0518PDQNR from Texas Instruments is a 1.8-V fixed-output, ultralow-quiescent-current (1 µA typ) low-dropout regulator capable of sourcing 200 mA with 235 mV max dropout at full load and ±1% output accuracy over temperature. It operates from 1.4 V to 5.5 V input and features active output discharge, foldback current limiting, and stability with ≥0.47-µF ceramic output capacitance - ideal for battery-powered wearable electronics and always-on subsystems.

For engineers reviewing the TPS7A0518PDQNR datasheet, TPS7A0518PDQNR pinout, TPS7A0518PDQNR application, or TPS7A0518PDQNR equivalent, key selection criteria include ultralow IQ for multi-year battery life, small 1.0-mm × 1.0-mm X2SON-4 package, guaranteed dropout performance at 200 mA, EN-controlled enable/disable sequencing, and compatibility with Li-SOCl₂, Li-MnO₂, and alkaline primary cells.

Technical Context

The TPS7A0518PDQNR implements a PMOS pass transistor architecture enabling near-zero dropout at light loads and predictable foldback current limiting during overload or short-circuit conditions. Its internal reference and error amplifier are optimized for operation down to 1.4 V input, supporting single-cell Li-primary and two-cell alkaline sources without external bias.

Thermal shutdown activates at 160°C with 20°C hysteresis, and UVLO ensures reliable startup only when VIN exceeds 1.21 V (rising) with 40-mV hysteresis. The device supports fast transient response via internal compensation compatible with minimal 0.47-µF COUT, eliminating need for external compensation networks.

Key Specifications

Pinout & Package

TPS7A0518PDQNR is packaged in a 1.0-mm × 1.0-mm, 4-pin X2SON (DQN) package with wettable flanks for automated optical inspection. The thermal pad is electrically isolated and must be connected to PCB ground for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TNPS7A0518PDQNR, the TPS7A0518PDQNR offers identical electrical performance but lacks automotive qualification and extended lifecycle support; versus MCP1700T-1802E/TT, it delivers 60% lower IQ, integrated EN, and active discharge - critical for advanced power sequencing in space-constrained designs.

Availability

TPS7A0518PDQNR is available at Aetrix Electronics and suitable for wearable electronics, smart remote controls, and portable medical patches requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for TPS7A0518PDQNR 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 delivering analog and embedded processing solutions, with leadership in power management ICs for battery-operated systems.

The TPS7A05 family was designed specifically for ultra-low-power, space-constrained applications such as wearables, IoT sensors, and medical patches - prioritizing nanoscale packaging, sub-µA quiescent current, and robust operation across primary battery chemistries.

FAQ

What is the maximum output current capability of the TPS7A0518PDQNR?

The TPS7A0518PDQNR is rated for a maximum continuous output current of 200 mA under recommended operating conditions (TJ ≤ 125°C, adequate PCB copper for heat dissipation). Its foldback current limit activates at approximately 210 mA, reducing output current to protect the device during overload or short-circuit events without triggering thermal shutdown immediately.

Does the TPS7A0518PDQNR require an external pull-up resistor on the EN pin?

No, the TPS7A0518PDQNR does not require an external pull-up resistor on the EN pin. When enable functionality is not needed, EN may be directly connected to IN. The EN pin draws only 10 nA typical current at VIN = 5.5 V, making it compatible with high-impedance GPIOs and eliminating need for external biasing components.

Can the TPS7A0518PDQNR operate from a single Li-SOCl₂ cell?

Yes, the TPS7A0518PDQNR can operate from a single Li-SOCl₂ cell, which typically ranges from 3.6 V (fresh) to 2.0 V (end-of-life). Its 1.4-V minimum input voltage and 235-mV dropout at 200 mA ensure regulation down to 2.035 V input - well within the usable discharge range of standard Li-SOCl₂ chemistry.

What is the purpose of the active output discharge feature in the TPS7A0518PDQNR?

Active output discharge in the TPS7A0518PDQNR rapidly pulls the OUT pin to GND (<1 ms) when EN is driven low. This prevents floating voltages on downstream circuitry during power-down sequencing, eliminates unintended wake-up from residual charge, and ensures deterministic reset behavior in systems with multiple power domains or supervisory ICs.

Is the TPS7A0518PDQNR stable with a 0.47-µF ceramic output capacitor?

Yes, the TPS7A0518PDQNR is explicitly characterized and guaranteed stable with a minimum 0.47-µF ceramic output capacitor (X5R/X7R, 0603 or larger). This eliminates the need for larger, less reliable electrolytic or tantalum capacitors and reduces total solution size - a key enabler for miniaturized wearable and medical devices.