Texas Instruments TPS7A1118PDRVR

Overview

TPS7A1118PDRVR from Texas Instruments is a 500-mA, ultra-low dropout linear regulator (LDO) with dual-rail input architecture (IN + BIAS), fixed 1.8-V output, 0.75-V minimum input voltage, 140-mV max dropout at 500 mA (DRV package), and 1.6-µA typical input quiescent current. It powers core rails in space-constrained, battery-operated systems such as wearables and camera modules.

For engineers reviewing the TPS7A1118PDRVR datasheet, TPS7A1118PDRVR pinout, TPS7A1118PDRVR application, or TPS7A1118PDRVR equivalent, key selection criteria include LILO (low-input/low-output) support, active output discharge, ±1.5% output accuracy over –40°C to 125°C, and compatibility with sub-1-V input supplies when paired with a ≥1.7-V BIAS rail.

Technical Context

The TPS7A1118PDRVR implements a dual-supply LDO architecture where the IN pin delivers power to the pass element while the BIAS pin independently powers internal control circuitry - enabling stable regulation even when VIN is as low as 140 mV above VOUT. This decoupling allows operation with pre-regulated DC/DC outputs or partially discharged batteries.

It integrates global UVLO (with separate thresholds for IN and BIAS pins), foldback current limiting, thermal shutdown at 160°C, and an active pulldown circuit (120-Ω resistor) for controlled output discharge during disable or fault. The device supports ceramic capacitors ≥2.2 µF on IN and OUT, and ≥0.1 µF on BIAS.

Key Specifications

Pinout & Package

TPS7A1118PDRVR is housed in a 2.0-mm × 2.0-mm WSON-6 (DRV) package with exposed thermal pad. Pin 1 = OUT, Pin 2 = NC (no internal connection), Pin 3 = EN, Pin 4 = BIAS, Pin 5 = GND, Pin 6 = IN. TI recommends connecting the thermal pad to ground for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A1118PDRVR, TPS7A0518PDBVR offers lower quiescent current but cannot support LILO operation, while TPS7A2018PDQNR provides smaller footprint and lower dropout at reduced current, yet omits both BIAS functionality and active discharge - making TPS7A1118PDRVR uniquely suited for high-efficiency, multi-rail, fast-shutdown portable designs.

Availability

TPS7A1118PDRVR is available at Aetrix Electronics and suitable for smart wearables, camera modules, and wireless audio devices requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS7A1118PDRVR 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 for portable and industrial applications.

The TPS7A11 family was engineered specifically for ultra-low-voltage, ultra-low-power battery-powered systems - targeting modern microcontrollers, image sensors, and RF ICs that demand sub-1-V input capability and sub-µA quiescent current without sacrificing output accuracy or transient performance.

FAQ

What is the minimum input voltage required for TPS7A1118PDRVR to regulate 1.8 V?

The TPS7A1118PDRVR requires a minimum input voltage of 0.75 V, but to maintain regulation at 1.8 V output, VIN must exceed VOUT by at least the dropout voltage - 140 mV maximum at 500 mA. Thus, the practical minimum VIN is 1.94 V under full load. However, with BIAS ≥1.7 V applied, the IN rail can drop as low as 1.8 V + 140 mV = 1.94 V while remaining in regulation. TPS7A1118PDRVR leverages the BIAS rail to sustain control circuitry even when VIN approaches VOUT.

Does TPS7A1118PDRVR require external components for stability?

Yes, TPS7A1118PDRVR requires three external ceramic capacitors: ≥2.2 µF on IN, ≥2.2 µF on OUT (up to 22 µF supported), and ≥0.1 µF on BIAS. All must be placed as close as possible to their respective pins. The device is optimized for low-ESR ceramics (≤250 mΩ for COUT) and does not require series resistance or feedforward capacitors. TPS7A1118PDRVR achieves stability without additional compensation networks.

How does the active discharge function work on TPS7A1118PDRVR?

The TPS7A1118PDRVR (P-version) integrates a 120-Ω pulldown resistor between OUT and GND, activated when EN is driven low or during thermal shutdown. Discharge time depends on COUT and parallel load resistance per t = 120·R_L/(120 + R_L)·C_OUT. This eliminates external discharge FETs and ensures deterministic reset behavior. TPS7A1118PDRVR's active discharge is not intended for large COUT (>100 µF) with collapsed input, as reverse current could exceed 5% of rated current.

Can TPS7A1118PDRVR operate without the BIAS pin connected?

No - the BIAS pin is mandatory for operation. TPS7A1118PDRVR uses BIAS to power its internal reference, error amplifier, and control logic. If BIAS is unconnected or below 1.46 V (UVLO rising threshold), the device remains disabled regardless of IN or EN state. The BIAS supply must be ≥1.7 V and include ≥0.1 µF ceramic capacitance to GND. TPS7A1118PDRVR cannot function as a single-rail LDO; BIAS is not optional.

What is the thermal performance of TPS7A1118PDRVR in the DRV package?

In the 2.0-mm × 2.0-mm WSON-6 (DRV) package, TPS7A1118PDRVR has R_θJA = 77.3°C/W (JEDEC High-K board) and R_θJB = 41.1°C/W. With proper thermal pad soldering to a 1-in² copper pour, it sustains 500 mA at ambient temperatures up to 85°C. Junction temperature must remain ≤125°C for continuous operation; thermal shutdown activates at 160°C. TPS7A1118PDRVR's low dropout and quiescent current inherently reduce self-heating versus conventional LDOs.