Texas Instruments TPS71247DRCT

Overview

TPS71247DRCT from Texas Instruments is a dual-output, ultra-low-noise, high-PSRR linear regulator with fixed 1.8 V and 2.85 V outputs, 250 mA per channel, 125 mV typical dropout at full load, and stable operation with 2.2 µF ceramic capacitors. It serves as a precision power supply for RF analog circuitry in portable wireless systems.

For engineers reviewing the TPS71247DRCT datasheet, TPS71247DRCT pinout, TPS71247DRCT application, or TPS71247DRCT equivalent, key selection criteria include independent enable control, noise reduction (NR) pin support, thermal shutdown behavior, and SON-10 package compatibility with high-density PCB layouts.

Technical Context

The TPS71247DRCT integrates two independent PMOS-based LDOs sharing a common input and ground, each with dedicated EN, OUT, and NR pins. Its architecture enables simultaneous regulation of mixed-signal rails-e.g., 1.8 V for digital logic and 2.85 V for RF front-end bias-without cross-talk degradation.

Each channel features an internal 1.225 V reference, active pull-down for fast load transient recovery, and thermal shutdown triggered at +160°C (reset at +140°C). The NR pin connects via a 250 kΩ internal resistor to the reference, allowing external capacitor filtering to reduce output noise to 11.8 × VOUT mVrms (e.g., ~33.6 mVrms at 2.85 V).

Key Specifications

Pinout & Package

DRC package: 3 mm × 3 mm × 1 mm thermally enhanced SON (VSON-10) with exposed thermal pad (Pin 5 = GND, Pad = GND). Pin 1 is IN; pin numbering follows standard top-view counterclockwise convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS71229DRCT and TPS71256DRCT, the TPS71247DRCT uniquely delivers factory-trimmed 1.8 V and 2.85 V outputs in one package-eliminating external components, saving board space, and guaranteeing voltage accuracy without calibration.

Availability

TPS71247DRCT is available at Aetrix Electronics and suitable for cellular transceivers, portable imaging systems, wireless PDAs, and DSP-based audio processors requiring stable component supply across automotive (-40°C to +125°C) and industrial temperature ranges.

Supply support for TPS71247DRCT 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 technologies, with decades of expertise in high-reliability, low-noise power solutions.

The TPS712xx product line was designed specifically for noise-sensitive RF and portable applications-delivering dual, ultra-low-noise LDOs in thermally optimized SON packages for space-constrained, battery-powered systems.

FAQ

What are the exact output voltages of the TPS71247DRCT?

The TPS71247DRCT provides two fixed, factory-trimmed output voltages: 1.8 V on OUT1 (Pin 3) and 2.85 V on OUT2 (Pin 4). These values are specified over -40°C to +125°C junction temperature and exhibit ±1.5% initial accuracy at +25°C, with ±3% total variation across line, load, and temperature.

Does the TPS71247DRCT require external feedback resistors?

No, the TPS71247DRCT does not require external feedback resistors because it is a fixed-output variant. Pins FB1/NC (Pin 9) and FB2/NC (Pin 7) are internally connected and unused-no external components are needed for voltage setting, simplifying layout and improving reliability versus adjustable versions like TPS71202.

How does the NR pin on the TPS71247DRCT reduce output noise?

The NR pin (Pin 6) connects to the internal 1.225 V reference through a 250 kΩ resistor. Adding a 0.01 µF ceramic capacitor from NR to GND forms a low-pass filter that attenuates reference noise, reducing total output noise from ~80 × VOUT to ~11.8 × VOUT mVrms (e.g., 33.6 mVrms at 2.85 V), critical for RF analog stages.

Can both outputs of the TPS71247DRCT be enabled independently?

Yes, the TPS71247DRCT features independent enable pins: EN1 (Pin 10) controls OUT1 (1.8 V) and EN2 (Pin 8) controls OUT2 (2.85 V). Each is active-high with TTL/CMOS-compatible thresholds (VIH = 1.2 V min, VIL = 0.4 V max), enabling flexible power sequencing and dynamic rail gating without affecting the other channel.

What thermal protection behavior does the TPS71247DRCT exhibit?

The TPS71247DRCT incorporates thermal shutdown that disables both outputs when either channel's junction temperature reaches +160°C. Output functionality resumes automatically when temperature falls to +140°C, providing hysteresis to prevent oscillation. This protects against sustained overload or inadequate heatsinking in compact enclosures.