Texas Instruments TPS7A7100RGWT

Overview

TPS7A7100RGWT from Texas Instruments is a 1-A, fast-transient, low-dropout linear regulator with 140 mV dropout at full load, 1.5 V to 6.5 V input range, and user-configurable output from 0.9 V to 3.5 V via six voltage-setting pins. It delivers ±1.5% output accuracy over line, load, and temperature, features power-good signaling and programmable soft-start, and is optimized for point-of-load regulation in RF and wireless infrastructure systems.

For engineers reviewing the TPS7A7100RGWT datasheet, TPS7A7100RGWT pinout, TPS7A7100RGWT application, or TPS7A7100RGWT equivalent, key selection criteria include its 16-pin VQFN (3 mm × 3 mm) package, ceramic-capacitor stability, 39.57 µV_RMS output noise at 1.2 V/1 A, and compatibility with high-slew-rate load transients up to 1 A/µs.

Technical Context

The TPS7A7100RGWT implements an adaptive error amplifier with integrated 0.5-V reference and programmable feedback network using six binary-weighted voltage-setting pins (50 mV to 1.6 V), enabling precise 50-mV-step output configuration without external resistors. Its architecture supports both fixed-output and traditional adjustable modes via FB/SNS pins.

Transient response is enhanced by a charge-pump-assisted pass element and internal compensation stable with 4.7–200 µF ceramic output capacitors. The device integrates thermal shutdown (160°C trip), current limiting (1.1–1.6 A foldback), and open-drain PG with 90% V_OUT threshold and 2% hysteresis.

Key Specifications

Pinout & Package

TPS7A7100RGWT uses a 3-mm × 3-mm, 16-pin VQFN package (RGT) with exposed thermal pad. Pin 1 is top-left corner (marked dot), and the thermal pad must be soldered to a large-area ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR, the TPS7A7100RGWT trades ultra-low noise for on-the-fly output configurability and lower input voltage capability; compared with TPS7A7200RGWT, it offers tighter thermal performance at 1-A loads while using less PCB copper area.

Availability

TPS7A7100RGWT is available at Aetrix Electronics and suitable for wireless infrastructure, RF component biasing, and set-top box power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS7A7100RGWT 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 communications portfolio coverage.

The TPS7A7100RGWT belongs to TI's high-performance LDO family targeting point-of-load regulation in RF, wireless, and high-speed digital systems, where low dropout, fast transient response, and flexible output configuration are essential.

FAQ

What is the maximum output voltage supported by TPS7A7100RGWT in fixed-output mode?

The TPS7A7100RGWT supports a maximum fixed output voltage of 3.5 V, achieved by grounding the 200-mV, 400-mV, 800-mV, and 1.6-V pins while leaving the 50-mV and 100-mV pins floating. This configuration sums to 0.5 V (internal reference) + 0.2 V + 0.4 V + 0.8 V + 1.6 V = 3.5 V. Output voltages above 3.5 V require adjustable mode using external feedback resistors.

Does TPS7A7100RGWT require an external feedforward capacitor in all configurations?

Yes - the TPS7A7100RGWT requires a feedforward capacitor (CFF) between FB and OUT when the output capacitance exceeds 47 µF, regardless of fixed or adjustable mode. For the RGT package, TI specifies a minimum 220-pF CFF in this case. Omitting CFF risks instability or degraded transient response under high-COUT conditions.

How does the soft-start function operate on TPS7A7100RGWT, and what capacitor value sets a 1-ms ramp time?

The TPS7A7100RGWT soft-start pin (SS) forms an RC circuit with an external capacitor to ground, where the internal charging current is 5.1 µA (typical). To achieve ~1-ms output ramp time, a 200-pF capacitor is required (t ≈ C × V_REF/I_SS, with V_REF = 0.5 V). Leaving SS open applies the default ~700-µs ramp, while larger capacitors extend ramp duration linearly.

Can TPS7A7100RGWT be used with input voltages below 1.5 V?

No - the absolute minimum input voltage for TPS7A7100RGWT is 1.425 V per datasheet Section 5.3, and functional operation below 1.5 V is not characterized. At V_IN = 1.425 V, the device supports only V_OUT ≤ 1.2 V (e.g., 0.9 V or 1.2 V) due to dropout constraints. Operation at 1.3 V or lower is outside specification and may result in regulation failure or thermal shutdown.

What is the thermal pad connection requirement for TPS7A7100RGWT, and why is it critical?

The exposed thermal pad of the TPS7A7100RGWT must be soldered to a large-area PCB ground plane using a 2×2 thermal via array (minimum). This connection is critical because it provides the primary thermal path (R_θJC(bot) = 3.8°C/W) and reduces junction temperature by up to 40°C at 1-A load. An unconnected or undersized thermal pad causes premature thermal shutdown and output droop under sustained load.