Texas Instruments TPS7A1125PDRVR

Overview

TPS7A1125PDRVR from Texas Instruments is a 500-mA ultra-low dropout linear regulator (LDO) with dual-input architecture (IN and BIAS pins), supporting input voltages as low as 0.75 V and fixed 2.5-V output. It delivers 1.5% output accuracy over load, line, and temperature (–40°C to +125°C), 140-mV max dropout at 500 mA (DRV package), and 1.6-µA typical IN quiescent current - enabling high-efficiency power delivery to core rails in battery-constrained portable electronics.

For engineers reviewing the TPS7A1125PDRVR datasheet, TPS7A1125PDRVR pinout, TPS7A1125PDRVR application, or TPS7A1125PDRVR equivalent, key selection criteria include its LILO (low-input/low-output) capability, active output discharge, dual-rail UVLO behavior, and WSON-6 package thermal performance for space- and efficiency-critical designs.

Technical Context

The TPS7A1125PDRVR implements a dual-supply LDO architecture where the IN pin provides the main power path (down to 0.75 V), while the BIAS pin (1.7–5.5 V) powers internal circuitry independently - decoupling regulation stability from ultra-low VIN conditions. This enables operation with sub-bandgap output voltages (e.g., 0.5–3.0 V) without sacrificing PSRR or transient response.

It integrates global UVLO (AND-gated VIN and VBIAS thresholds), foldback current limiting (up to 1.25 A peak), thermal shutdown (160°C), and an active pulldown circuit (120-Ω resistor) for controlled output discharge upon disable or fault. The device achieves 64-dB PSRR at 1 kHz and 93.9 µV_RMS output noise (10 Hz–100 kHz) under 50-mA load.

Key Specifications

Pinout & Package

TPS7A1125PDRVR is housed in a 2.0-mm × 2.0-mm WSON-6 package (DRV) with exposed thermal pad. Pin 1 = OUT, Pin 2 = NC (no internal connection; recommended grounded for thermal relief), Pin 3 = EN, Pin 4 = BIAS, Pin 5 = GND, Pin 6 = IN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A1125PDRVR, the PDRVT offers identical performance in reel format for production lines, while the TPS7A0525PDQNR trades current capability and LILO flexibility for ultra-low IQ - making it viable only in non-LILO, ≤200-mA use cases.

Availability

TPS7A1125PDRVR is available at Aetrix Electronics and suitable for smart wearables, wireless audio devices, and camera modules requiring stable component supply with guaranteed long-term manufacturability and TI's full product lifecycle support.

Supply support for TPS7A1125PDRVR 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 power management ICs, with decades of LDO design expertise and broad automotive, industrial, and consumer qualification.

The TPS7A11 family was engineered specifically for ultra-low-input, ultra-low-dropout applications in space-constrained, battery-powered systems - prioritizing LILO operation, nanoscale quiescent current, and precision output regulation.

FAQ

What is the maximum input voltage rating for the TPS7A1125PDRVR?

The absolute maximum input voltage (VIN) for the TPS7A1125PDRVR is 3.6 V. Exceeding this voltage risks permanent damage. The recommended operating range is 0.75 V to 3.3 V, aligning with its ultra-low-input design intent. This rating is specified in Section 6.1 Absolute Maximum Ratings of the official datasheet (SBVS316B).

Does the TPS7A1125PDRVR require an external capacitor on the BIAS pin?

Yes, the TPS7A1125PDRVR requires a minimum 0.1-µF ceramic capacitor from BIAS to GND for stability and optimal PSRR performance. This capacitor must be placed as close as possible to the BIAS pin. Omitting it may cause instability or degraded rejection of BIAS rail noise, as confirmed in Section 6.3 Recommended Operating Conditions and Figure 8-2 of the TPS7A11 datasheet.

Can the TPS7A1125PDRVR operate without connecting the EN pin?

Yes, the TPS7A1125PDRVR can operate without an external EN signal - but the EN pin must be tied to either IN or BIAS to ensure enablement. If connected to IN, VIN must exceed 0.9 V to guarantee activation. Leaving EN floating is not permitted and may result in undefined output behavior, per Table 5-1 Pin Functions in the datasheet.

What is the purpose of the NC pin on the TPS7A1125PDRVR WSON package?

The NC (No Connect) pin on the TPS7A1125PDRVR (Pin 2) has no internal connection. Texas Instruments recommends connecting it to GND to improve thermal dissipation via the PCB copper area, though it may be left floating if thermal constraints permit. This guidance is explicitly stated in the "Pin Functions" table for the DRV package in Section 5 of the datasheet.

How does the active discharge feature work on the TPS7A1125PDRVR?

The TPS7A1125PDRVR's active discharge engages a 120-Ω internal pulldown resistor between OUT and GND when the EN pin is driven low or during thermal shutdown. Discharge time depends on COUT and parallel load resistance (RL), calculated as t = 120·RL/(120+RL)·COUT. This ensures rapid, controlled output collapse - critical for power sequencing in multi-rail systems.