Texas Instruments TPS71711DCKR

Overview

TPS71711DCKR 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 noise-sensitive analog and RF power rails in compact portable systems.

For engineers reviewing the TPS71711DCKR datasheet, TPS71711DCKR pinout, TPS71711DCKR application, or TPS71711DCKR equivalent, key selection criteria include its SC-70-5 package footprint, enable-controlled standby mode (2.5 µA shutdown current), 2.5 V to 6.5 V input range, ±3% output accuracy over temperature/load, and stability with only 1 µF ceramic output capacitance.

Technical Context

The TPS71711DCKR employs a PMOS pass device and high-gain BiCMOS error amplifier to achieve fast transient response and high PSRR even at low headroom (VIN – VOUT = 1 V). Its architecture integrates a dedicated noise reduction (NR) pin with quick-start circuitry that charges the CNR capacitor in ~135 µs, enabling simultaneous low noise and rapid startup.

It features undervoltage lockout (UVLO) with 2.45 V rising threshold and 150 mV hysteresis, thermal shutdown at 160°C with 140°C reset, and internal current limiting (200–575 mA). The device operates across –40°C to 125°C junction temperature and maintains regulation down to zero load via low-current mode loop compensation.

Key Specifications

Pinout & Package

TPS71711DCKR is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained PCB layouts in handheld devices. 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 LDO regulator applications.

Compared with TPS71711DCKR, TPS71712DCKR offers identical performance in every parameter except output voltage, making it a seamless variant swap; MCP1700T-1102E/TT trades significant PSRR and noise performance for ultra-low IQ, limiting its use to non-critical digital rails.

Availability

TPS71711DCKR is available at Aetrix Electronics and suitable for camera sensor power, mobile phone baseband supplies, wireless audio codecs, and portable medical sensors requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for TPS71711DCKR 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 over 50 years of innovation in high-reliability, high-performance ICs.

The TPS717 family was engineered specifically for ultra-low-noise, high-PSRR power delivery in space-constrained portable electronics - targeting RF transceivers, imaging sensors, and precision analog signal chains where traditional LDOs fail to meet noise and transient requirements.

FAQ

What is the minimum input voltage required for TPS71711DCKR to regulate 1.1 V output?

The TPS71711DCKR requires a minimum input voltage of 2.5 V per datasheet specifications. This is higher than the theoretical dropout-based minimum (1.1 V + 0.17 V = 1.27 V) because the internal UVLO circuit mandates VIN ≥ 2.45 V to enable regulation, and the absolute minimum operating condition is defined as 2.5 V across temperature and process variation. Below 2.5 V, the device remains in undervoltage lockout regardless of load.

Can TPS71711DCKR operate without an output capacitor?

No, TPS71711DCKR requires a minimum 1 µF ceramic output capacitor connected between OUT and GND for stability, as confirmed in Section 6.3 Recommended Operating Conditions and Figure 26 of the datasheet. Omitting this capacitor causes oscillation and unregulated output. The device is optimized for X5R/X7R dielectrics; tantalum or aluminum electrolytics are not recommended due to ESR and aging effects.

How does the NR pin on TPS71711DCKR reduce output noise?

The NR pin on TPS71711DCKR connects to a 0.01 µF ceramic capacitor that filters noise from the internal 1.20-V bandgap reference. This reduces high-frequency reference noise coupled into the error amplifier, lowering total output noise from 95×V_OUT µV_RMS (no CNR) to 12.5×V_OUT µV_RMS - achieving 30 µV_RMS at 1.1 V. The integrated quick-start circuit charges CNR within 135 µs at power-up to preserve fast startup.

Is TPS71711DCKR compatible with 1.8-V GPIO for enable control?

Yes, TPS71711DCKR is fully compatible with 1.8-V GPIO for enable control. Its V_EN(HIGH) threshold is specified as 1.2 V minimum (with 6.5 V absolute maximum), and V_EN(LOW) is 0.4 V maximum - ensuring reliable turn-on with standard 1.8-V logic high (≥1.8 V) and turn-off with logic low (≤0.4 V). Input leakage on EN is ≤1 µA, posing negligible loading on microcontroller pins.

Does TPS71711DCKR require a minimum load current to maintain regulation?

No, TPS71711DCKR does not require a minimum load current. It employs an adaptive low-current mode circuit that maintains loop stability and output regulation down to zero load, as explicitly stated in Section 7.3.5 "Minimum Load" of the datasheet. This eliminates the need for dummy loads and ensures accurate voltage delivery during deep-sleep or standby states in battery-powered systems.