Texas Instruments TPS7A1011PDSET

Overview

TPS7A1011PDSET from Texas Instruments is a 300-mA ultra-low-dropout linear regulator (LDO) with dual-supply architecture (VIN + VBIAS), supporting input as low as 0.75 V and output down to 0.5 V. It delivers 1.5% output accuracy over load, line, and temperature (–40°C to +125°C), features 70 mV max dropout at 300 mA (YKA package), and operates with only 1.6 µA VIN quiescent current - ideal for powering ultra-low-voltage MCU cores and analog sensors in space-constrained wearable devices.

For engineers reviewing the TPS7A1011PDSET datasheet, TPS7A1011PDSET pinout, TPS7A1011PDSET application, or TPS7A1011PDSET equivalent, key selection considerations include its dual-rail bias architecture, sub-1-V input capability, active output discharge (P-version), thermal shutdown (160°C), and WSON-6 (DSE) package compatibility with high-density portable PCB layouts.

Technical Context

The TPS7A1011PDSET uses a dedicated BIAS rail (1.7–5.5 V) to power internal circuitry while VIN supplies the main output path, enabling stable regulation even when VIN is only 70 mV above VOUT. This architecture decouples control-loop power from the main power path, preserving PSRR (60 dB @ 1 kHz) and transient response under ultra-low VIN conditions.

It integrates global UVLO with independent thresholds on VIN (675 mV rising) and VBIAS (1.54 V rising), an AND-gated enable logic, and - in the P-version denoted by "PDSET" - an active 120-Ω pulldown resistor for monotonic output discharge during disable or thermal shutdown.

Key Specifications

Pinout & Package

TPS7A1011PDSET is packaged in a 1.50-mm × 1.50-mm WSON-6 (DSE) package with wettable flanks, optimized for automated optical inspection (AOI) and high-density layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A1011PDSET, the TPS7A1111PDSET offers identical performance at 1.2 V but requires voltage rail redesign, while the MCP1804T-1102I/OT lacks VBIAS support and delivers lower current and higher dropout - making it viable only in less demanding, higher-VIN portable designs.

Availability

TPS7A1011PDSET is available at Aetrix Electronics and suitable for smart wearables, ultra-low-power sensors, and portable medical devices requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.

Supply support for TPS7A1011PDSET 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 solutions, with decades of LDO design expertise and automotive-grade reliability validation.

The TPS7A10 family was engineered specifically for ultra-portable, battery-powered applications demanding sub-1-V input operation, ultra-low quiescent current, and high accuracy - targeting next-generation wearables, hearables, and implantable-grade diagnostics.

FAQ

What is the function of the BIAS pin on the TPS7A1011PDSET?

The BIAS pin on the TPS7A1011PDSET powers the internal control circuitry independently from the main VIN supply, enabling stable regulation even when VIN is as low as 70 mV above VOUT. It accepts 1.7–5.5 V (e.g., battery rail), consumes only 6 µA typical quiescent current, and allows the device to maintain full PSRR and accuracy while VIN operates near the output voltage - a critical capability for single-cell Li-ion and energy-harvesting systems. The TPS7A1011PDSET relies on this dual-rail architecture to achieve its ultra-low-input specification.

Does the TPS7A1011PDSET support active output discharge, and how does it work?

Yes, the TPS7A1011PDSET (denoted by the "P" suffix in PDSET) includes active output discharge: an internal 120-Ω pulldown resistor connects OUT to GND when the EN pin is driven low or during thermal shutdown. This ensures rapid, controlled discharge of output capacitance - preventing floating voltages that could cause latch-up or undefined states in downstream logic. Discharge time depends on COUT and parallel load resistance, per τ = (120 Ω ∥ RL) × COUT. The feature is absent in non-P versions and is confirmed in the datasheet's Pin Functions and Feature Description sections for the P-version.

What are the absolute maximum ratings for input voltage on the TPS7A1011PDSET?

The TPS7A1011PDSET has an absolute maximum VIN rating of 3.6 V or (VIN + 0.3 V), whichever is lower - meaning VIN must not exceed 3.6 V under any condition. Exceeding this stress rating may cause permanent damage. The recommended operating range is narrower: 0.75 V to 3.3 V. This distinction is critical for system-level protection design - for example, when VIN is sourced from a DC/DC converter with potential overshoot, a clamping diode or overvoltage protector must be added to ensure VIN stays ≤3.6 V at all times. The TPS7A1011PDSET itself does not include internal overvoltage protection beyond this absolute limit.

Can the TPS7A1011PDSET be used with a 0.5-V output, or is 1.1 V fixed?

No - the TPS7A1011PDSET is a fixed-output variant specifying 1.1 V. While the broader TPS7A10 family offers outputs from 0.5 V to 3.0 V in 50-mV steps, the "11" in TPS7A1011PDSET explicitly denotes the 1.1-V version. Datasheet Section 1 (Features) and Table 1 (Device Information) confirm this part number corresponds exclusively to the 1.1-V fixed option in the WSON-6 (DSE) package. Using it for 0.5-V applications would violate output specification and risk functional failure; the correct part for 0.5 V is TPS7A1005PDSET.

How does the global UVLO function on the TPS7A1011PDSET?

The TPS7A1011PDSET implements global UVLO using two independent comparators - one monitoring VIN (rising threshold = 675 mV) and one monitoring VBIAS (rising threshold = 1.54 V). Their outputs feed an internal AND gate, so the device remains disabled until both rails exceed their respective UVLO thresholds. This prevents partial turn-on and erratic behavior during power-up sequencing. The hysteresis (75 mV for VIN, 80 mV for VBIAS) ensures clean release without oscillation. This behavior is documented in Section 7.3.2 and Figure 38 of the SBVS314B datasheet and applies identically to the TPS7A1011PDSET.