Texas Instruments TPS7A05285PDQNR

Overview

TPS7A05285PDQNR from Texas Instruments is a 2.85-V fixed-output, ultralow-quiescent-current LDO regulator delivering up to 200 mA with 1 µA typical IQ, 235 mV max dropout at full load, ±1% output accuracy, and stable operation with ≥0.47-µF ceramic output capacitance. It serves as the primary power rail for ultra-low-power microcontrollers in battery-constrained wearable sensors.

For engineers reviewing the TPS7A05285PDQNR datasheet, TPS7A05285PDQNR pinout, TPS7A05285PDQNR application, or TPS7A05285PDQNR equivalent, key selection criteria include its 1.4–5.5 V input range, active output discharge, thermal shutdown (160°C), foldback current limiting, and compatibility with Li-SOCl₂, Li-MnO₂, and multi-cell alkaline batteries.

Technical Context

The TPS7A05285PDQNR implements a PMOS pass transistor architecture enabling ultralow dropout and near-zero reverse current during shutdown. Its internal bandgap reference and error amplifier maintain regulation across –40°C to +125°C junction temperature while supporting fast transient response via optimized control loop compensation.

Enable logic operates with VEN(HI) ≥ 0.9 V and VEN(LO) ≤ 0.4 V, allowing direct interfacing with 1.8-V or 3.3-V GPIOs. The device integrates UVLO (1.3 V threshold with 40-mV hysteresis) and thermal shutdown with 20°C hysteresis to protect against overtemperature and undervoltage conditions.

Key Specifications

Pinout & Package

TPS7A05285PDQNR uses the 1.0-mm × 1.0-mm, 4-pin X2SON (DQN) package with wettable flank terminations for automated optical inspection. Thermal pad must be connected to a large-area ground plane for optimal thermal performance (RθJB = 83.5°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A05285YKAR, the TPS7A05285PDQNR offers superior thermal performance (RθJB = 83.5°C/W vs. 66.9°C/W) and easier assembly, while the MCP1700T-2802E/TT lacks critical protections and delivers lower efficiency under light loads due to higher IQ and dropout.

Availability

TPS7A05285PDQNR is available at Aetrix Electronics and suitable for wearable electronics, smart remote controls, and always-on industrial sensors requiring stable component supply with guaranteed long-term availability.

Supply support for TPS7A05285PDQNR 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 and embedded processing technologies, with decades of expertise in power management IC design and high-volume manufacturing.

The TPS7A05 product line delivers ultralow-IQ LDOs for battery-powered applications where multi-year operational life and minimal PCB area are mandatory design requirements.

FAQ

What is the maximum input voltage rating for the TPS7A05285PDQNR?

The TPS7A05285PDQNR has an absolute maximum input voltage of 6.0 V. Operation above this level risks permanent damage. For reliable continuous use, the recommended operating range is 1.4 V to 5.5 V, which aligns with common primary battery chemistries and ensures optimal regulation and thermal performance across the full temperature range.

Does the TPS7A05285PDQNR require an external pull-up resistor on the EN pin?

No, the TPS7A05285PDQNR does not require an external pull-up on EN. When enable functionality is not needed, the EN pin must be directly connected to IN. The device draws only 10 nA from EN at 5.5 V, and its logic thresholds (VEN(HI) ≥ 0.9 V, VEN(LO) ≤ 0.4 V) allow direct interface with standard GPIOs without additional biasing components.

Can the TPS7A05285PDQNR operate with a 0.22-µF output capacitor?

No - the TPS7A05285PDQNR requires a minimum 0.47-µF ceramic output capacitor for guaranteed stability across all operating conditions. Using a 0.22-µF capacitor may cause oscillation or degraded transient response, especially at light loads or elevated temperatures. TI's datasheet explicitly specifies 0.47 µF as the lower bound for unconditional stability.

What is the thermal resistance (RθJA) of the TPS7A05285PDQNR in its X2SON package?

The TPS7A05285PDQNR in the 1.0-mm × 1.0-mm X2SON (DQN) package has a junction-to-ambient thermal resistance (RθJA) of 144.1°C/W under standard JEDEC 2-layer board conditions. This value assumes proper thermal pad connection to a large copper ground plane; omitting the thermal pad connection increases RθJA significantly and risks thermal shutdown under 200-mA load.

Is active output discharge present in the TPS7A05285PDQNR, and how does it function?

Yes, the TPS7A05285PDQNR includes active output discharge. When the EN pin is driven low, an internal NMOS switch connects the OUT pin to GND, discharging the output capacitor rapidly. This prevents residual voltage from powering downstream circuitry or causing undefined states during power sequencing - a critical feature for systems with multiple voltage domains or strict reset timing requirements.