Texas Instruments TPS7A0522PDBZT

Overview

TPS7A0522PDBZT from Texas Instruments is a 200-mA, ultralow-quiescent-current (1 µA typ) low-dropout regulator in a 3-pin SOT-23 package, delivering a fixed 2.2-V output with ±3% accuracy over –40°C to +125°C. It operates from 1.4 V to 5.5 V input and achieves 222 mV max dropout at 200 mA (2.2 V_OUT), enabling use in Li-SOCl₂, Li-MnO₂, and multi-cell alkaline battery systems.

For engineers reviewing the TPS7A0522PDBZT datasheet, TPS7A0522PDBZT pinout, TPS7A0522PDBZT application, or TPS7A0522PDBZT equivalent, key selection criteria include ultralow IQ for battery longevity, active output discharge, foldback current limiting, stability with ≥0.47-µF ceramic capacitors, and thermal shutdown at 160°C.

Technical Context

The TPS7A0522PDBZT employs a PMOS pass transistor architecture enabling near-zero dropout behavior at light loads and robust transient response under dynamic load steps up to 200 mA. Its enable pin (EN) supports logic-level control with V_EN(HI) = 0.9 V and V_EN(LO) = 0.4 V, and internal UVLO ensures operation only above 1.21 V input.

It integrates an active pulldown circuit for rapid output discharge when disabled, and features foldback current limiting that reduces output current during overload to limit power dissipation. Thermal shutdown activates at 160°C junction temperature with 20°C hysteresis.

Key Specifications

Pinout & Package

TPS7A0522PDBZT uses the 3-pin SOT-23 (DBZ) package: 2.90 mm × 1.60 mm, surface-mount, lead-free, RoHS-compliant. Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT. No EN pin - device is always enabled; EN functionality is omitted in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0522PDQNR, the TPS7A0522PDBZT omits EN and pulldown for simplified, lower-cost always-on use; versus MCP1700T-2202E/TT, it delivers superior dropout, tighter accuracy, and integrated safety features at marginally higher price.

Availability

TPS7A0522PDBZT is available at Aetrix Electronics and suitable for wearable electronics, always-on IoT peripherals, and medical disposable patches requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS7A0522PDBZT 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, embedded processing, and connectivity technologies, with decades of LDO design expertise and automotive-grade reliability validation.

The TPS7A05 family was engineered specifically for ultra-low-power, battery-constrained applications - emphasizing nanoscale IQ, small-footprint packaging, and robustness across wide temperature and input-voltage ranges.

FAQ

What is the maximum input voltage rating for the TPS7A0522PDBZT?

The TPS7A0522PDBZT has an absolute maximum input voltage of 6.0 V. However, its recommended operating input range is 1.4 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate thermal limits, especially at high ambient temperatures. Always observe the 6.0-V absolute maximum rating to ensure long-term reliability of the TPS7A0522PDBZT.

Does the TPS7A0522PDBZT include an enable (EN) pin?

No, the TPS7A0522PDBZT does not include an enable pin. It is a 3-pin SOT-23 variant (DBZ package) with only IN, GND, and OUT pins. Enable functionality is absent - the device powers up whenever valid input voltage is applied. For EN capability, consider the pin-compatible TPS7A0522PDQNR (X2SON) or TPS7A0522PDBVR (5-pin SOT-23).

What output capacitor value is required for stable operation of the TPS7A0522PDBZT?

The TPS7A0522PDBZT is stable with a minimum 0.47-µF ceramic capacitor (X7R or better) on the output. A 1-µF capacitor is recommended for optimal transient response and PSRR performance. Larger values (up to 22 µF) are acceptable and improve load-step immunity, but do not degrade stability. The TPS7A0522PDBZT requires no ESR tuning.

How does the dropout voltage of the TPS7A0522PDBZT vary with load and temperature?

At 200 mA and TJ = –40°C to +85°C, the TPS7A0522PDBZT exhibits a maximum dropout of 222 mV. Dropout increases slightly at higher temperatures and decreases at lighter loads - e.g., ~20 mV at 100 µA. The DBZ package's thermal resistance (R_θJA = 267.3°C/W) means self-heating must be considered in high-ambient or high-power-dissipation layouts.

Is the TPS7A0522PDBZT suitable for Li-SOCl₂ primary battery applications?

Yes, the TPS7A0522PDBZT is explicitly qualified for Li-SOCl₂, Li-MnO₂, and multi-cell alkaline batteries. Its 1.4-V minimum input, 1-µA quiescent current, and 222-mV dropout at 200 mA allow reliable regulation across the full discharge curve of these chemistries - supporting >10-year shelf life and extended operational life in metering and remote sensing applications using the TPS7A0522PDBZT.