Texas Instruments TPS717285DCKR

Overview

TPS717285DCKR from Texas Instruments is a fixed-output, low-noise, high-PSRR linear regulator delivering 2.85 V at up to 150 mA with 170 mV typical dropout, 30 µV_RMS output noise (100 Hz–100 kHz), and 70 dB PSRR at 1 kHz - designed for powering noise-sensitive analog and RF circuits in portable electronics.

For engineers reviewing the TPS717285DCKR datasheet, TPS717285DCKR pinout, TPS717285DCKR application, or TPS717285DCKR equivalent, key selection criteria include ultra-low noise performance under light-to-moderate loads, SC-70 package size constraints, enable-controlled power sequencing, and stability with 1-µF ceramic output capacitance without external compensation.

Technical Context

The TPS717285DCKR employs a PMOS pass device and high-gain BiCMOS error amplifier to achieve fast transient response and high PSRR across 100 Hz–1 MHz while maintaining only 45 µA ground current at no load. Its architecture integrates a dedicated noise reduction (NR) pin with quick-start circuitry that charges the NR capacitor within 160 µs for rapid, low-noise startup.

It features undervoltage lockout (UVLO) with 2.45 V rising threshold and 150 mV hysteresis, thermal shutdown at 160°C with 20°C hysteresis, and internal current limiting (200–575 mA). The device operates over –40°C to 125°C junction temperature and is stable with 1 µF ±20% X5R/X7R ceramic output capacitors.

Key Specifications

Pinout & Package

TPS717285DCKR is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm × 0.95 mm, optimized for space-constrained PCB layouts in smartphones and wearables. Thermal resistance R_θJA is 279.2°C/W (JEDEC JESD51-2 standard).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS717285DCKR, TPS7A20285PDBVR trades 10 µV_RMS noise margin for 20 µA lower IQ and smaller footprint, while MCP1703T-285I/TT lacks enable/NR functionality and delivers significantly lower PSRR - making TPS717285DCKR the optimal choice for RF/analog co-location where noise and ripple rejection are non-negotiable.

Availability

TPS717285DCKR is available at Aetrix Electronics and suitable for camera sensor power, mobile phone baseband supplies, and portable medical sensor designs requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for TPS717285DCKR 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 and high-volume manufacturing reliability.

The TPS717 family was engineered specifically for battery-powered portable electronics demanding ultra-low noise, high PSRR, and minimal board area - targeting camera modules, RF transceivers, and precision analog signal chains in smartphones and wearables.

FAQ

What is the maximum input voltage rating for the TPS717285DCKR?

The TPS717285DCKR has an absolute maximum input voltage of 7 V, but its recommended operating range is 2.5 V to 6.5 V. Exceeding 6.5 V may trigger internal protection or degrade long-term reliability. For sustained operation, VIN should remain ≤6.5 V, with headroom above VOUT determined by dropout voltage - e.g., ≥3.02 V input required for full 150 mA output at 2.85 V.

Does the TPS717285DCKR require an external output capacitor, and what type is recommended?

Yes, the TPS717285DCKR requires a minimum 1 µF ceramic output capacitor connected between OUT and GND for stability. Texas Instruments specifies X5R or X7R dielectrics with ±20% tolerance; 0603 or 0402 case sizes are commonly used. Tantalum or aluminum electrolytic capacitors are not recommended due to ESR and aging effects that can compromise transient response and loop stability.

How does the NR (Noise Reduction) pin function on the TPS717285DCKR?

The NR pin on the TPS717285DCKR connects to a 0.01 µF ceramic capacitor to filter noise from the internal bandgap reference, reducing output noise to 30 µV_RMS. A built-in quick-start circuit actively charges this capacitor within 160 µs at power-up, ensuring low-noise operation without startup delay. The NR pin is high-impedance, so low-leakage ceramics (e.g., C0G/NP0 or X5R) must be used.

Can the TPS717285DCKR operate without any load connected to the output?

Yes, the TPS717285DCKR is fully stable and functional at zero load current. It incorporates a low-current mode circuit that maintains loop gain and output regulation accuracy even with no external load - eliminating the need for minimum load resistors. This feature is essential for intermittent-sensing applications like wearable health monitors that spend extended periods in sleep mode.

What thermal protection behavior does the TPS717285DCKR exhibit under overload conditions?

The TPS717285DCKR activates thermal shutdown at approximately 160°C junction temperature, disabling the output until the die cools to ~140°C, at which point regulation resumes. This auto-recovering cycle prevents permanent damage but indicates excessive power dissipation. For reliable operation, design must limit TJ to ≤125°C using appropriate PCB copper area, avoiding continuous thermal cycling which degrades long-term reliability.