Texas Instruments TPS7A0508PDQNR

Overview

TPS7A0508PDQNR from Texas Instruments is an ultralow-quiescent-current (1 µA typ) 200-mA low-dropout regulator in a 1.0-mm × 1.0-mm X2SON-4 package, delivering fixed 0.8 V output with ±1% typical accuracy and 235 mV max dropout at 200 mA. It supports input voltages from 1.4 V to 5.5 V 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 TPS7A0508PDQNR datasheet, TPS7A0508PDQNR pinout, TPS7A0508PDQNR application, or TPS7A0508PDQNR equivalent, key selection criteria include quiescent current vs load, dropout behavior at 0.8 V output, thermal performance in X2SON-4, EN pin logic thresholds, and compatibility with ultra-low-capacitance output filtering.

Technical Context

The TPS7A0508PDQNR employs a PMOS pass transistor architecture enabling ultralow IQ and fast transient response without requiring external compensation. Its enable circuitry integrates precise logic-level thresholds (VEN(HI) = 0.9 V, VEN(LO) = 0.4 V) and internal pull-down on EN for reliable power sequencing.

Thermal design is optimized for the X2SON-4 package with RθJA = 144.1°C/W and RθJB = 83.5°C/W, supporting operation from –40°C to +125°C junction temperature. The device includes integrated UVLO (1.3 V threshold, 40 mV hysteresis) and thermal shutdown (160°C trip, 140°C reset).

Key Specifications

Pinout & Package

TPS7A0508PDQNR is housed in a 1.0-mm × 1.0-mm, 4-pin X2SON (DQN) package with wettable flanks, optimized for automated optical inspection and high-density layouts. The thermal pad is electrically isolated and must be connected to a large-area ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0508PDQNR, the XC6210B082MR-G trades off current capability and feature set for lower unit cost, while the RT9080AL-08GJ6 achieves lower IQ but sacrifices system-level control and safety functions essential for battery-powered embedded systems.

Availability

TPS7A0508PDQNR is available at Aetrix Electronics and suitable for wearable electronics, always-on sensor nodes, and wireless remote controls requiring stable component supply, long-term lifecycle support, and guaranteed traceability for medical and industrial end equipment.

Supply support for TPS7A0508PDQNR 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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and system-on-chip solutions for industrial, automotive, and personal electronics markets.

The TPS7A05 product line delivers ultralow-IQ LDOs targeting battery-powered applications where multi-year operational life, small form factor, and robust power sequencing are mandatory design requirements.

FAQ

What is the minimum input voltage required for TPS7A0508PDQNR to regulate 0.8 V output?

The TPS7A0508PDQNR requires a minimum input voltage of 1.035 V to maintain regulation at 200 mA load, based on its maximum dropout voltage of 235 mV at 3.3 VOUT scaled to 0.8 V output. At lighter loads, VIN can approach 0.8 V + VDO (e.g., ~0.85 V at 1 mA). The absolute minimum specified VIN is 1.4 V per recommended operating conditions to ensure full parameter compliance across temperature and process variation. TPS7A0508PDQNR remains functional below 1.4 V but may not meet accuracy or dropout specifications.

Does TPS7A0508PDQNR require an external pull-up resistor on the EN pin?

No, TPS7A0508PDQNR 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 to ensure permanent operation. The EN pin draws only 10 nA at 5.5 V, so even weak internal pull-ups in host MCUs are sufficient. External pull-up is unnecessary unless the controlling signal has high impedance or open-drain topology that cannot reliably drive EN above 0.9 V.

Can TPS7A0508PDQNR operate with a 0.22-µF output capacitor?

No, TPS7A0508PDQNR is not guaranteed stable with a 0.22-µF output capacitor. The datasheet specifies stability with ≥0.47 µF ceramic capacitors having low ESR. Using 0.22 µF risks degraded phase margin, leading to oscillation or poor transient response under load steps. For space-constrained designs, TI recommends verified 0.47-µF 0201 or 0402 MLCCs - not smaller values - to ensure robust performance across temperature and voltage.

How does the active output discharge function work in TPS7A0508PDQNR?

When EN is driven low, TPS7A0508PDQNR activates an internal 120-Ω pulldown resistor between OUT and GND, discharging the output capacitor rapidly. This occurs within microseconds and ensures the output falls to near-zero volts before downstream circuitry powers down. The feature prevents floating I/O states, avoids back-powering of upstream components, and satisfies strict power sequencing requirements in multi-rail systems. Discharge time depends on COUT value - e.g., 1 µF discharges to <100 mV in <200 µs.

Is TPS7A0508PDQNR qualified for automotive applications?

TPS7A0508PDQNR is not AEC-Q100 qualified and is not recommended for automotive applications. It is specified for industrial temperature range (–40°C to +125°C), but lacks automotive-specific qualification testing such as HTOL, ESD, and vibration reliability. For automotive use, TI offers the pin-compatible TPS7A05xx-Q1 series, which undergoes full AEC-Q100 Grade 1 qualification and includes enhanced ESD robustness (±2-kV HBM) and extended lifetime validation. TPS7A0508PDQNR should be used only in consumer, medical, or industrial equipment.