Texas Instruments TPS717285DCKT

Overview

TPS717285DCKT 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. It operates from 2.5 V to 6.5 V input and targets noise-sensitive analog and RF power rails in portable imaging and wireless systems.

For engineers reviewing the TPS717285DCKT datasheet, TPS717285DCKT pinout, TPS717285DCKT application, or TPS717285DCKT equivalent, key selection criteria include ultra-low noise performance with optional NR capacitor support, SC-70-5 package footprint constraints, thermal shutdown behavior at 160°C, and compatibility with 1-μF ceramic output capacitance for stability.

Technical Context

The TPS717285DCKT uses a PMOS pass device and BiCMOS process to achieve fast startup, low ground current (45 μA typical), and high-loop-gain regulation across –40°C to 125°C. Its error amplifier features precision bandgap reference and quick-start circuitry for the NR pin, enabling simultaneous low noise and rapid turn-on.

It integrates undervoltage lockout (UVLO rising threshold 2.45 V), thermal shutdown (160°C trip, 140°C reset), and internal current limiting (200–575 mA). The fixed 2.85 V output version includes dedicated NR/FB pin for external noise reduction capacitor connection-distinct from adjustable variants that use FB for feedback divider.

Key Specifications

Pinout & Package

TPS717285DCKT is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained PCB layouts in mobile and wearable electronics. 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 LDO regulator applications.

Compared with TPL720F285PDBVR and MCP1826-28501E/DB, the TPS717285DCKT uniquely delivers 70 dB PSRR at 1 kHz plus dedicated NR pin functionality - making it the only option among the three capable of meeting stringent noise requirements in camera and RF subsystems without external filtering.

Availability

TPS717285DCKT is available at Aetrix Electronics and suitable for camera sensor power, mobile handset RF bias, wireless LAN modules, and Bluetooth® audio devices requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TPS717285DCKT 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 power management ICs for portable, industrial, and automotive markets.

The TPS717 family was designed specifically for noise-critical, space-constrained applications such as camera modules and wireless transceivers - combining ultra-low noise, high PSRR, and miniature packaging in a single LDO platform.

FAQ

What is the maximum input voltage rating for the TPS717285DCKT?

The TPS717285DCKT 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 reliability. The device's UVLO circuit activates below 2.45 V, ensuring safe startup only when sufficient input headroom exists for regulation.

Does the TPS717285DCKT require an external noise reduction capacitor?

The TPS717285DCKT includes a dedicated NR/FB pin and benefits significantly from a 0.01 μF ceramic capacitor connected to it: this reduces output noise to 30 μV_RMS and improves PSRR by up to 15 dB at 100 kHz. While functional without it, omitting the NR capacitor increases noise to ~95×V_OUT μV_RMS, compromising performance in sensitive analog applications.

Can the TPS717285DCKT operate with zero output load?

Yes, the TPS717285DCKT is explicitly designed for zero-load stability - unlike many traditional PMOS LDOs. Its low-current mode circuit maintains loop gain even at 0 mA output, ensuring regulation accuracy and avoiding oscillation or voltage drift during standby or intermittent-sensing modes in battery-powered systems.

What is the thermal shutdown behavior of the TPS717285DCKT?

The TPS717285DCKT triggers thermal shutdown at approximately 160°C junction temperature and resets when cooled to ~140°C. This hysteresis prevents rapid cycling. In the SC-70 package, sustained 150 mA output into high ambient temperatures may cause repeated shutdown unless board-level thermal design (e.g., copper pour, airflow) keeps T_J ≤125°C per datasheet limits.

Is the TPS717285DCKT pin-compatible with other TPS717 variants?

Yes - all TPS717x DCK (SC-70-5) variants share identical pinout: IN, GND, EN, NR/FB, OUT. However, only fixed-output versions like TPS717285DCKT use NR/FB as a noise-reduction node; adjustable versions (e.g., TPS71701) use the same pin as feedback input, requiring different external resistor networks and rendering them functionally incompatible without layout changes.