Texas Instruments TPS71711DCKT

Overview

TPS71711DCKT from Texas Instruments is a fixed-output, 1.1-V low-dropout linear regulator with ultra-high PSRR (70 dB at 1 kHz), 30 μV_RMS output noise (100 Hz–100 kHz), and 170 mV typical dropout at 150 mA - designed for powering noise-sensitive analog and RF circuitry in compact portable systems.

For engineers reviewing the TPS71711DCKT datasheet, TPS71711DCKT pinout, TPS71711DCKT application, or TPS71711DCKT equivalent, key selection criteria include its SC-70-5 package footprint, 45-μA ground current at light load, 1-μF ceramic output capacitor stability, and integrated noise reduction (NR) pin for sub-10 μV_RMS performance with 0.01-μF CNR.

Technical Context

The TPS71711DCKT employs a PMOS pass device and high-gain BiCMOS error amplifier to achieve fast transient response and maintain high PSRR down to 100 kHz even with only 1 V headroom (VIN – VOUT). Its quick-start circuit charges the NR capacitor within 135 μs, enabling stable 1.1-V regulation without external compensation.

It integrates undervoltage lockout (UVLO) with 2.45 V rising threshold and 150 mV hysteresis, thermal shutdown at 160°C, and current limiting of 200–575 mA - all operating across –40°C to 125°C junction temperature while maintaining ±3% output accuracy over line, load, and process variation.

Key Specifications

Pinout & Package

TPS71711DCKT is housed in a 5-pin SC-70 package (2.00 mm × 1.25 mm), optimized for space-constrained PCB layouts in mobile and wearable applications. Thermal performance is characterized by R_θJA = 279.2°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS71711DCKT, TPS7A05115PDBVR trades PSRR bandwidth for lower IQ, while MCP1700T-1102E/TT sacrifices noise performance and dropout for cost and footprint compatibility - making TPS71711DCKT the optimal choice for RF/analog co-location where 70 dB PSRR and 30 μV_RMS noise are mandatory.

Availability

TPS71711DCKT is available at Aetrix Electronics and suitable for camera sensor power, mobile phone baseband, wireless audio codec, and portable medical sensor applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for TPS71711DCKT 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 company specializing in analog and embedded processing technologies, with leadership in precision power management and signal chain solutions.

The TPS717 family was engineered for ultra-low-noise, high-PSRR regulation in space-constrained portable electronics - targeting RF front-ends, imaging sensors, and precision analog subsystems where traditional LDOs fail to meet noise and transient requirements.

FAQ

What is the minimum input voltage required for TPS71711DCKT to regulate 1.1 V output?

The minimum input voltage for TPS71711DCKT is determined by its dropout specification: 170 mV typical at 150 mA. Therefore, VIN must be ≥1.27 V under full load. However, the absolute minimum specified input is 2.5 V per recommended operating conditions - ensuring proper UVLO release, internal biasing, and PSRR performance across temperature. Operating below 2.5 V is not guaranteed.

Can TPS71711DCKT operate without the noise reduction (NR) capacitor?

Yes, TPS71711DCKT functions without the NR capacitor, but output noise increases significantly - from 30 μV_RMS to approximately 95×V_OUT μV_RMS (≈105 μV_RMS for 1.1 V). The NR pin is internally connected to the bandgap reference; omitting CNR degrades PSRR below 100 kHz and eliminates the quick-start benefit. For noise-critical applications, 0.01 μF is strongly recommended.

Is TPS71711DCKT stable with a 1-μF ceramic output capacitor?

Yes, TPS71711DCKT is explicitly characterized and guaranteed stable with a minimum 1-μF X5R/X7R ceramic capacitor on the OUT pin. This is a key differentiator from older LDOs requiring ≥10 μF tantalum or aluminum electrolytic capacitors. Stability is maintained across –40°C to 125°C and 0–150 mA load range per TI's electrical characteristics table.

What is the maximum junction temperature and thermal shutdown behavior of TPS71711DCKT?

TPS71711DCKT features thermal shutdown at 160°C (trip) with hysteresis - resetting at ~140°C. Its maximum rated junction temperature is 125°C for continuous operation. The SC-70 package has R_θJA = 279.2°C/W; sustained operation near thermal limit indicates insufficient copper area or airflow. Designers should verify worst-case power dissipation (P_D = (VIN – 1.1 V) × I_OUT) and derate accordingly.

Does TPS71711DCKT support reverse current protection?

No, TPS71711DCKT does not include reverse current protection. Its PMOS pass transistor contains an intrinsic body diode that conducts from OUT to IN if V_OUT > V_IN. During such reverse-bias conditions, current is uncontrolled and may damage upstream sources. External reverse-blocking circuitry (e.g., series Schottky diode or ideal diode controller) is required in systems where back-driving is possible.