Texas Instruments TPS7A1108PDRVR

Overview

TPS7A1108PDRVR 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 output voltages down to 0.5 V. It delivers 1.5% output accuracy over load, line, and temperature (–40°C to +125°C), 64 dB PSRR at 1 kHz, and ultra-low quiescent current (1.6 µA on IN, 6 µA on BIAS). It powers core rails in space-constrained, battery-operated devices such as smart wearables and camera modules.

For engineers reviewing the TPS7A1108PDRVR datasheet, TPS7A1108PDRVR pinout, TPS7A1108PDRVR application, or TPS7A1108PDRVR equivalent, key selection criteria include LILO (low-input/low-output) capability, BIAS-rail efficiency optimization, active output discharge, thermal shutdown behavior, and WSON-6 package compatibility with high-density PCB layouts.

Technical Context

The TPS7A1108PDRVR implements a dual-supply LDO architecture where the IN pin supplies power to the pass element while the BIAS pin powers internal control circuitry-enabling stable regulation even when VIN is only 140 mV above VOUT. Its global UVLO combines independent rising/falling thresholds on both IN (675 mV / 600 mV) and BIAS (1.54 V / 1.44 V) to prevent erratic startup under marginal supply conditions.

It features foldback current limiting (990 mA typical for DRV package), thermal shutdown at 160°C, and an active pulldown circuit (120 Ω) for controlled output discharge during disable. The device supports fixed 0.8-V output and requires ceramic capacitors: 2.2 µF CIN, 2.2–22 µF COUT (ESR < 250 mΩ), and 0.1 µF CBIAS.

Key Specifications

Pinout & Package

TPS7A1108PDRVR is housed in a 2.00-mm × 2.00-mm, 6-pin WSON package (DRV) with exposed thermal pad. The package supports fine-pitch PCB assembly and requires thermal pad connection to ground for optimal power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A1112PDRVR and TPS7A0508PDBVR, the TPS7A1108PDRVR uniquely combines 0.8-V fixed output, 500-mA delivery, dual-rail efficiency, and active discharge in a 2-mm² WSON-making it the only option for high-performance, space-constrained LILO systems demanding precise low-voltage regulation.

Availability

TPS7A1108PDRVR is available at Aetrix Electronics and suitable for smart wearables, camera modules, and portable medical devices requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for TPS7A1108PDRVR 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 expertise in power management IC design.

The TPS7A11 family was engineered specifically for ultra-low-voltage, ultra-low-power battery-operated systems-targeting applications where traditional LDOs fail due to insufficient VIN–VOUT headroom or excessive quiescent current.

FAQ

What is the fixed output voltage of the TPS7A1108PDRVR?

The TPS7A1108PDRVR provides a factory-trimmed fixed output voltage of 0.8 V. This value is laser-trimmed during production and maintains ±1.5% accuracy over load, line, and temperature (–40°C to +125°C), making it suitable for powering advanced low-voltage processor cores and analog sensor interfaces.

Does the TPS7A1108PDRVR require both IN and BIAS supplies to operate?

Yes-the TPS7A1108PDRVR requires both IN (0.75–3.3 V) and BIAS (1.7–5.5 V) supplies for full specification compliance. The IN pin powers the pass transistor, while the BIAS pin powers internal control circuitry. Omitting BIAS forces reliance on IN for both paths, degrading dropout performance and limiting minimum VIN.

How does the active discharge function work on the TPS7A1108PDRVR?

The TPS7A1108PDRVR integrates a 120-Ω pulldown resistor activated when EN is driven low or during thermal shutdown. This discharges the output capacitor through the internal FET, ensuring rapid, predictable power-down. Discharge time depends on COUT and parallel load resistance per t = 120·R_L/(120 + R_L)·C_OUT.

What are the recommended input and output capacitors for the TPS7A1108PDRVR?

TI specifies a 2.2-µF ceramic capacitor on IN, 2.2–22-µF ceramic on OUT (ESR < 250 mΩ), and 0.1-µF ceramic on BIAS. All capacitors must be placed as close as possible to their respective pins. X5R/X7R dielectrics are recommended for stable capacitance across voltage and temperature.

Is the TPS7A1108PDRVR pin-compatible with other members of the TPS7A11 family?

Yes-TPS7A1108PDRVR shares identical 6-pin WSON (DRV) package, pinout, and footprint with all TPS7A11 variants (e.g., TPS7A1112PDRVR, TPS7A1118PDRVR). Output voltage is the only functional difference; no PCB layout change is needed when swapping within the same package variant.