Texas Instruments TPS7A0527PDBZT

Overview

TPS7A0527PDBZT from Texas Instruments is a 2.7-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 wearables and always-on subsystems.

For engineers reviewing the TPS7A0527PDBZT datasheet, TPS7A0527PDBZT pinout, TPS7A0527PDBZT application, or TPS7A0527PDBZT equivalent, key selection criteria include quiescent current under light load, dropout voltage at 200 mA, thermal performance in SOT-23 (DBZ), EN pin logic thresholds, and compatibility with low-ESR ceramic capacitors in space-constrained portable designs.

Technical Context

The TPS7A0527PDBZT employs a PMOS pass transistor architecture enabling ultralow IQ and near-zero dropout sensitivity to load transients. Its internal reference and error amplifier deliver tight regulation across –40°C to +125°C, with line regulation of 5–18 mV and load regulation of 20–55 mV depending on package and output current range.

It integrates an enable comparator with 0.4 V logic-low and 0.9 V logic-high thresholds, plus thermal shutdown (160°C trip, 140°C reset) and foldback current limiting (210–700 mA). The active pulldown circuit discharges the output when disabled, preventing floating rail conditions in multi-rail systems.

Key Specifications

Pinout & Package

TPS7A0527PDBZT uses the 3-pin SOT-23 (DBZ) package (2.90 mm × 1.60 mm), optimized for thermal performance and PCB area efficiency in portable designs. The package includes exposed pad thermal relief connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0527PDBZT, the TPS7A0525PDBZT offers identical performance in all parameters except output voltage, making it a drop-in alternative for 2.5-V systems; the MCP1700T-2702E/TT provides comparable voltage but trades off higher dropout and no active discharge for lower unit cost in non-critical discharge scenarios.

Availability

TPS7A0527PDBZT is available at Aetrix Electronics and suitable for wearable electronics, always-on power supplies, and portable medical devices requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for TPS7A0527PDBZT 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 manufacturing.

The TPS7A05 family was engineered specifically for ultra-low-power, space-constrained battery-operated applications - delivering nanoscale IQ without sacrificing transient response, accuracy, or thermal robustness in miniature packages.

FAQ

What is the maximum input voltage rating for the TPS7A0527PDBZT?

The absolute maximum input voltage for the TPS7A0527PDBZT is 6.0 V. Operation beyond this risks permanent damage. For reliable continuous use, the recommended operating input range is 1.4 V to 5.5 V - covering common battery chemistries including Li-SOCl₂ (3.6 V), Li-MnO₂ (3.0 V), and two-cell alkaline (3.2 V). Exceeding 5.5 V violates recommended conditions even if below 6.0 V absolute max.

Does the TPS7A0527PDBZT require an external pull-up resistor on the EN pin?

No, the TPS7A0527PDBZT does not require an external pull-up on EN. When enable functionality is not needed, the EN pin must be directly connected to IN to ensure the device remains active. The internal EN comparator has defined logic thresholds (0.4 V low, 0.9 V high), and the pin draws only 10 nA at 5.5 V - eliminating leakage concerns that would necessitate external biasing.

Can the TPS7A0527PDBZT operate stably with a 0.22-µF output capacitor?

No - the TPS7A0527PDBZT requires a minimum 0.47-µF ceramic output capacitor for guaranteed stability across all operating conditions. Using 0.22 µF may cause oscillation or degraded transient response, especially under load steps. The datasheet explicitly specifies 0.47 µF as the lower bound, and TI's characterization confirms phase margin compliance only at or above this value with standard X7R/X5R dielectrics.

What is the thermal resistance (RθJA) of the TPS7A0527PDBZT in its SOT-23 (DBZ) package?

The junction-to-ambient thermal resistance (RθJA) for the TPS7A0527PDBZT in the DBZ package is 267.3°C/W under standard JEDEC JESD51-2 PCB conditions (2s2p copper). This value assumes the thermal pad is soldered to a solid 1-in² copper plane. Performance improves significantly with enhanced PCB copper area or internal layer heatsinking - actual RθJA in well-designed layouts can reach ≤150°C/W.

Is the TPS7A0527PDBZT pin-compatible with other TPS7A05 variants like TPS7A0533PDBZT?

Yes - all TPS7A05 variants in the DBZ (3-pin SOT-23) package share identical pinout: Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, with OUT connected internally to the thermal pad (not a pin). The TPS7A0527PDBZT and TPS7A0533PDBZT differ only in fixed output voltage (2.7 V vs 3.3 V); no PCB layout changes are required when swapping between them, provided the downstream circuit tolerates the voltage difference.