Texas Instruments TPS7A1025PDSER

Overview

TPS7A1025PDSER from Texas Instruments is a 300-mA, ultra-low-dropout linear regulator (LDO) with dual-supply architecture (VIN + VBIAS), fixed 2.5-V output, 0.75-V minimum input voltage, 70-mV max dropout at 300 mA (YKA package), and ±1.5% output accuracy over –40°C to +125°C. It powers low-voltage cores in battery-constrained wearables and sensor nodes.

For engineers reviewing the TPS7A1025PDSER datasheet, TPS7A1025PDSER pinout, TPS7A1025PDSER application, or TPS7A1025PDSER equivalent, key selection criteria include ultra-low VIN support (down to 0.75 V), bias-rail efficiency optimization (VBIAS = 1.7–5.5 V), active output discharge (P-version), and WSON-6 package thermal performance (RθJA = 188.8°C/W).

Technical Context

The TPS7A1025PDSER employs a dual-rail architecture where VIN supplies the pass element and VBIAS powers internal control circuitry-enabling stable regulation even when VIN is as low as 70 mV above VOUT. Its global UVLO requires both VIN > 675 mV (rising) and VBIAS > 1.54 V (rising) before enabling regulation.

It integrates a monotonic soft-start, active output discharge (120-Ω pulldown resistor), thermal shutdown (160°C trip), and high PSRR (60 dB @ 1 kHz). The device achieves 93.9 µVRMS output noise (10 Hz–100 kHz, VOUT = 1.0 V, IOUT = 50 mA) and supports ceramic output capacitors from 2.2 µF to 22 µF.

Key Specifications

Pinout & Package

TPS7A1025PDSER is housed in a 1.50-mm × 1.50-mm, 6-pin WSON (DSE) package with wettable flanks, optimized for automated optical inspection (AOI) and thermal performance (RθJA = 188.8°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout LDO applications.

Compared with TPS7A1025PDSER, TPS7A1125PDSER simplifies layout but forfeits LILO operation, while NCP163AMX250TBG offers lower cost but lacks the ultra-low-VIN headroom and controlled discharge essential for energy-harvesting and wearables.

Availability

TPS7A1025PDSER is available at Aetrix Electronics and suitable for smart wearables, portable medical devices, and ultra-low-power IoT edge nodes requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.

Supply support for TPS7A1025PDSER 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 broad automotive, industrial, and consumer qualification.

The TPS7A10 family was engineered for ultra-portable, battery-powered applications demanding sub-1-V input operation, nanoscale packaging, and high PSRR - targeting wearables, hearables, and sensor nodes where every microwatt and millivolt matters.

FAQ

What is the minimum input voltage required for TPS7A1025PDSER to regulate 2.5 V?

The TPS7A1025PDSER requires VIN ≥ 0.75 V minimum, but stable 2.5-V regulation demands VIN ≥ VOUT + dropout. With max dropout of 90 mV (DSE package), VIN must be ≥ 2.59 V under full 300-mA load. At light loads, VIN can approach 2.5 V. The VBIAS rail (1.7–5.5 V) powers internal circuitry independently, enabling this ultra-low-VIN capability.

Does TPS7A1025PDSER support active output discharge, and how does it work?

Yes, TPS7A1025PDSER is the "P" version and includes active output discharge. When EN is driven low or thermal shutdown activates, an internal 120-Ω pulldown resistor connects OUT to GND. Discharge time depends on COUT and parallel load resistance (τ ≈ 120·RL·COUT/(120 + RL)). This ensures rapid, predictable VOUT decay for safe power sequencing.

Can TPS7A1025PDSER operate with only the VIN supply, without connecting VBIAS?

No. The TPS7A1025PDSER requires both VIN and VBIAS to be within specification for regulation. Global UVLO mandates VIN > 675 mV (rising) AND VBIAS > 1.54 V (rising). Leaving VBIAS unconnected disables the device. VBIAS must be supplied from a stable 1.7–5.5-V source - commonly a coin cell, backup rail, or separate LDO.

What is the recommended output capacitor range for TPS7A1025PDSER, and why does it matter?

The datasheet specifies COUT = 2.2 µF to 22 µF (ceramic, X5R/X7R). Values <2.2 µF risk instability and poor transient response; values >22 µF increase start-up time and may cause overshoot. A 4.7-µF or 10-µF capacitor balances stability, transient suppression, and board space - critical for noise-sensitive analog circuits powered by TPS7A1025PDSER.

How does the PSRR of TPS7A1025PDSER compare between VIN and VBIAS inputs?

TPS7A1025PDSER delivers matched 60-dB PSRR at 1 kHz for both VIN and VBIAS inputs under typical conditions (VOUT = 1.1 V, IOUT = 50–300 mA). This symmetry ensures robust noise rejection regardless of whether switching noise couples onto the main supply (VIN) or bias rail (VBIAS), a key advantage in multi-rail PMU designs where both rails may share noisy switcher outputs.