Texas Instruments TPS7A0520PDBZT

Overview

TPS7A0520PDBZT from Texas Instruments is a 200-mA, ultralow-quiescent-current (1 µA typ) low-dropout regulator in a 3-pin SOT-23 package, delivering fixed 2.0 V output with ±1% typical accuracy and 235 mV max dropout at full load. 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 wearables and always-on subsystems.

For engineers reviewing the TPS7A0520PDBZT datasheet, TPS7A0520PDBZT pinout, TPS7A0520PDBZT application, or TPS7A0520PDBZT equivalent, key selection criteria include quiescent current under light load, dropout performance at 200 mA, thermal behavior in SOT-23 (DBZ), EN pin logic thresholds, and compatibility with ultra-small 0.47–22 µF output capacitors in space-constrained portable designs.

Technical Context

The TPS7A0520PDBZT employs a PMOS pass transistor architecture enabling near-zero dropout at microamp loads and stable regulation down to 1.4 V input. Its internal reference and error amplifier maintain tight output accuracy across –40°C to +125°C junction temperature while supporting fast transient response via optimized compensation for low-ESR ceramic capacitors.

Enable control is implemented with CMOS-compatible thresholds (VEN(HI) = 0.9 V min, VEN(LO) = 0.4 V max), and the integrated active pulldown circuit discharges the output within microseconds when disabled. Thermal shutdown activates at 160°C with hysteresis reset at 140°C, ensuring robust operation under overload or ambient stress.

Key Specifications

Pinout & Package

TPS7A0520PDBZT uses the 3-pin SOT-23 (DBZ) package (2.90 mm × 1.60 mm), optimized for high thermal resistance (RθJA = 267.3°C/W) in low-power applications where self-heating remains minimal at ≤200 mA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0520PDBZT, the PDQNR offers superior thermal performance in a smaller footprint but requires requalification of layout and assembly; the MCP1700T-2002E/TT provides pin-compatible cost reduction at the expense of accuracy, discharge control, and guaranteed 1-µA IQ.

Availability

TPS7A0520PDBZT is available at Aetrix Electronics and suitable for wearable electronics, smart remote controls, and industrial wireless sensors requiring stable component supply with long-term manufacturability and consistent parametric performance.

Supply support for TPS7A0520PDBZT 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 ICs for industrial, automotive, and consumer markets.

The TPS7A05 product line delivers ultralow-IQ LDOs targeting battery-powered edge devices, emphasizing nanoamp quiescent current, small-footprint packaging, and robust operation across extended temperature ranges.

FAQ

What is the maximum output current capability of the TPS7A0520PDBZT?

The TPS7A0520PDBZT is rated for 200 mA continuous output current under recommended operating conditions. Its foldback current limit activates at approximately 210–700 mA depending on temperature and input voltage, protecting the device during short-circuit events while limiting power dissipation. The 200 mA rating assumes proper thermal management using the SOT-23 (DBZ) package on a standard PCB with adequate copper area.

Does the TPS7A0520PDBZT require an external pull-up resistor on the EN pin?

No, the TPS7A0520PDBZT does not require an external pull-up resistor on the EN pin. When enable functionality is not needed, the EN pin must be connected directly to IN per the datasheet. The internal EN threshold is defined as VEN(HI) ≥0.9 V and VEN(LO) ≤0.4 V, making it compatible with standard logic outputs without external biasing components.

Can the TPS7A0520PDBZT operate with a 0.47 µF output capacitor?

Yes, the TPS7A0520PDBZT is explicitly characterized and guaranteed stable with a minimum 0.47 µF ceramic output capacitor. This value satisfies phase margin requirements across all operating conditions, including –40°C to +125°C junction temperature and 1.4–5.5 V input range. Larger values (up to 22 µF) are also supported and improve transient response.

What is the dropout voltage of the TPS7A0520PDBZT at 200 mA load?

At 200 mA load and TJ = –40°C to +85°C, the TPS7A0520PDBZT exhibits a maximum dropout voltage of 222 mV for the DBZ package. This value is measured at VOUT = 2.0 V and confirms reliable regulation from input voltages as low as 2.222 V, enabling use with aging primary batteries or low-headroom sources.

Is active output discharge available on the TPS7A0520PDBZT?

Yes, the TPS7A0520PDBZT includes an integrated active pulldown circuit that discharges the OUT pin when the device is disabled (VEN < 0.4 V). The typical pulldown resistance is 120 Ω, enabling discharge to <0.1 V within 100 µs for a 1-µF output capacitor - critical for preventing unintended wake-up or biasing errors in power-gated systems.