Texas Instruments TPS7A1508PDRVR

Overview

TPS7A1508PDRVR from Texas Instruments is a 400-mA ultra-low-dropout linear regulator (LDO) with 0.8-V fixed output, 0.7-V to 2.2-V input range, 80-mV max dropout at 400 mA, ±1% output accuracy over load/line/temperature, and active output discharge. It powers core logic in space-constrained battery-powered devices such as camera modules and wearables.

For engineers reviewing the TPS7A1508PDRVR datasheet, TPS7A1508PDRVR pinout, TPS7A1508PDRVR application, or TPS7A1508PDRVR equivalent, key selection considerations include LILO (low-input, low-output) operation enabled by separate BIAS rail, 20-mV load transient response (1 mA → 250 mA in 10 μs), 84-dB PSRR at 1 kHz, and WSON-6 package thermal performance (R_θJA = 75.7°C/W).

Technical Context

The TPS7A1508PDRVR uses a dual-rail architecture: the IN pin supplies main current path (down to V_OUT + 50 mV), while the BIAS pin (2.2–5.5 V) powers internal reference and control circuitry-enabling stable regulation under ultra-low VIN conditions. It implements foldback current limiting with 450–1100 mA I_CL and 270 mA I_SC, global UVLO on both IN and BIAS pins, and active overshoot pulldown.

Its functional block includes a high-impedance error amplifier, bandgap reference, thermal shutdown (165°C trip, 140°C reset), and an internal MOSFET pulldown switch (36 Ω) for fast output discharge during disable. The SENSE pin supports remote feedback to compensate for PCB trace resistance between OUT and load.

Key Specifications

Pinout & Package

TPS7A1508PDRVR is housed in a 2-mm × 2-mm, 6-pin WSON package (DRV) with exposed thermal pad electrically connected to GND. This package delivers R_θJA = 75.7°C/W and supports reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A1508PDRVR, TPS7A1601DQNR offers higher current but cannot operate below 1.1 V on IN, while LP5907MFX-0.8/NOPB eliminates BIAS complexity but sacrifices LILO capability, remote sensing, and 400-mA drive-making TPS7A1508PDRVR uniquely suited for ultra-low-voltage, high-accuracy, space-constrained applications.

Availability

TPS7A1508PDRVR is available at Aetrix Electronics and suitable for camera modules, wireless earbuds, and smart watches requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS7A1508PDRVR 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 and embedded processing technologies, with decades of LDO design expertise and broad automotive, industrial, and consumer product portfolios.

The TPS7A15 family was engineered specifically for ultra-low-input, ultra-low-output battery-powered applications-prioritizing efficiency at sub-1-V operating points, fast transient response, and minimal solution size in wafer-level and WSON packages.

FAQ

What is the minimum input voltage required for TPS7A1508PDRVR to regulate 0.8 V?

The TPS7A1508PDRVR requires a minimum input voltage of 0.7 V on the IN pin, but full regulation at 0.8 V is guaranteed only when VIN ≥ VOUT + 100 mV (i.e., ≥0.9 V) per datasheet specifications. Below that, dropout behavior occurs-though the device remains functional down to 0.7 V with reduced headroom. The BIAS pin must simultaneously be ≥2.2 V or VOUT + 1.4 V (≥2.2 V for 0.8-V output).

Does TPS7A1508PDRVR support remote voltage sensing?

Yes, TPS7A1508PDRVR supports remote sensing via the SENSE pin. Connecting SENSE directly to the load side of the output trace compensates for IR drop across PCB traces, maintaining ±1% output accuracy at the point-of-load. This is critical for high-current, low-voltage rails where even small trace resistances cause significant regulation error.

Can TPS7A1508PDRVR be used without connecting the BIAS pin?

No-TPS7A1508PDRVR requires a valid BIAS supply (≥2.2 V or VOUT + 1.4 V) to power its internal reference and control circuitry. Leaving BIAS unconnected or below UVLO threshold (1.42 V typ) disables regulation regardless of IN and EN states due to global UVLO. A 0.1-µF ceramic capacitor to GND is mandatory for stable BIAS operation.

What is the purpose of the active discharge function in TPS7A1508PDRVR?

The active discharge function in TPS7A1508PDRVR uses an internal 36-Ω pulldown resistor activated during disable (via EN low, UVLO, or thermal shutdown) to rapidly discharge the output capacitor. This ensures predictable power-down sequencing, prevents floating outputs from interfering with downstream logic, and eliminates need for external bleed resistors-reducing BOM count and board area.

How does TPS7A1508PDRVR handle short-circuit conditions?

TPS7A1508PDRVR employs hybrid foldback current limiting: it delivers up to 450–1100 mA (ICL) in brick-wall mode above 60% of nominal output (0.48 V), then scales current downward as VOUT drops, delivering ~270 mA (ISC) at 0 V. During sustained short, thermal shutdown (165°C) activates, cycling the device until fault clears-protecting both IC and PCB from damage.