Texas Instruments TPS71256DRCT

Overview

TPS71256DRCT from Texas Instruments is a dual-channel, fixed-output 2.8 V/2.8 V low-dropout linear regulator in a thermally enhanced 10-pin SON package. It delivers up to 250 mA per channel with 125 mV typical dropout at full load, 32 µV_RMS output noise (with 0.01 µF NR capacitor), and 65 dB PSRR at 10 kHz - engineered for RF-sensitive analog power domains in portable wireless systems.

For engineers reviewing the TPS71256DRCT datasheet, TPS71256DRCT pinout, TPS71256DRCT application, or TPS71256DRCT equivalent, key selection criteria include dual independent enable control, ultra-low noise performance under 250 mA load, thermal shutdown behavior at +160°C, and compatibility with 2.2 µF ceramic output capacitors without external compensation.

Technical Context

The TPS71256DRCT integrates two independent PMOS-based LDOs sharing a common input and ground, each with dedicated EN, OUT, and NR pins. Its internal 1.225 V reference feeds both regulators via separate feedback paths, and the 250 kΩ internal resistor on the NR pin enables programmable noise filtering using an external bypass capacitor.

Each channel features independent current limiting (~600 mA typical), thermal shutdown activation at +160°C (reset at +140°C), and undervoltage lockout with 2.25 V turn-on threshold and 100 mV hysteresis. The device operates across –40°C to +125°C junction temperature and supports fast 60 ms startup with 0.001 µF NR capacitance.

Key Specifications

Pinout & Package

TPS71256DRCT uses a 3 mm × 3 mm × 1 mm thermally enhanced SON-10 (DRC) package with exposed thermal pad (connected to GND). Pin numbering follows standard top-view layout with pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS71247DRCT and TPS71229DRCT, the TPS71256DRCT uniquely provides matched 2.8 V/2.8 V outputs with identical noise, PSRR, and transient performance on both channels - essential for differential signal chains and balanced RF architectures.

Availability

TPS71256DRCT is available at Aetrix Electronics and suitable for cellular transceiver power, wireless audio codec supply, DSP/FPGA core bias, and digital camera sensor interface applications requiring stable component supply, extended temperature support, and dual-rail precision regulation.

Supply support for TPS71256DRCT 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 TPS712xx family was developed specifically for noise-sensitive RF and portable applications, emphasizing ultra-low noise, high PSRR, dual independent regulation, and thermal robustness in compact packages.

FAQ

What is the maximum input voltage rating for the TPS71256DRCT?

The TPS71256DRCT has an absolute maximum input voltage of 6.0 V, but its recommended operating range is 2.7 V to 5.5 V. Exceeding 5.5 V risks permanent damage, while operation below 2.7 V may cause dropout or UVLO activation. For reliable 2.8 V output, VIN must be ≥2.925 V (2.8 V + 125 mV dropout) across temperature and load.

Does the TPS71256DRCT require external compensation components?

No, the TPS71256DRCT is internally compensated and stable with 2.2 µF ceramic output capacitors on both OUT1 and OUT2. Unlike adjustable LDOs in the same family, the fixed-output TPS71256DRCT does not use FB1/FB2 pins and therefore needs no external resistors or compensation capacitors - simplifying layout and reducing BOM count.

How does the NR pin affect startup time in the TPS71256DRCT?

The NR pin contains an internal 250 kΩ resistor that is shorted for ~400 ms after enable to accelerate startup. Using a 0.001 µF NR capacitor achieves the specified 60 ms startup time; larger values (e.g., 0.01 µF) improve noise performance but increase startup duration proportionally due to RC time constant effects on internal reference settling.

Can both outputs of the TPS71256DRCT be disabled independently?

Yes - EN1 controls OUT1 and EN2 controls OUT2 independently. Driving either enable pin below 0.4 V places its respective LDO into shutdown, reducing its ground current to <0.3 mA. This enables dynamic power gating, such as disabling the RF transmitter rail while keeping the receiver active, without affecting the second channel's regulation.

What thermal performance can be expected from the TPS71256DRCT in a standard PCB layout?

In a JEDEC-standard high-K board, the TPS71256DRCT exhibits a junction-to-ambient thermal resistance (θ_JA) of 49.6°C/W. With both channels delivering 250 mA at 2.8 V from a 3.8 V input, power dissipation is ~500 mW - resulting in ~25°C junction rise above ambient. Adding thermal vias to the exposed pad reduces θ_JA significantly, enabling full-load operation at +85°C ambient.