Texas Instruments TPS717185DSET

Overview

TPS717185DSET from Texas Instruments is a fixed-output, 1.85 V, 150-mA low-dropout linear regulator in a 1.5-mm × 1.5-mm WSON-6 package. It delivers ultra-low noise (30 µV_RMS, 100 Hz–100 kHz), high PSRR (70 dB at 1 kHz), and low dropout (170 mV typical at 150 mA) for powering noise-sensitive analog and RF circuits in portable electronics.

For engineers reviewing the TPS717185DSET datasheet, TPS717185DSET pinout, TPS717185DSET application, or TPS717185DSET equivalent, key selection criteria include output voltage accuracy (±3% over load/line/temp), stability with 1-µF ceramic output capacitance, enable-pin compatibility with TTL/CMOS logic, and thermal shutdown protection at 160°C.

Technical Context

The TPS717185DSET uses a PMOS pass device and advanced BiCMOS process to achieve fast startup, excellent transient response, and high PSRR across wide frequency range - 70 dB at 1 kHz, 67 dB at 100 kHz, and 45 dB at 1 MHz - under 1-V headroom (V_IN – V_OUT). Its precision voltage reference and feedback loop ensure worst-case output accuracy of ±3%.

It features an integrated noise reduction (NR) pin for external 0.01-µF capacitor filtering, reducing output noise by up to 75% versus no NR cap; the quick-start circuit fully charges CNR within ~160 µs. Shutdown current is ≤1.5 µA at V_IN ≥ 4.5 V, supporting battery longevity in always-on systems.

Key Specifications

Pinout & Package

TPS717185DSET is packaged in a thermally enhanced 1.5-mm × 1.5-mm, 6-pin WSON (DSE) package with exposed thermal pad. Pin 5 is GND; Pin 6 is IN; Pin 1 is OUT; Pin 4 is NR (Noise Reduction); Pin 3 is EN (Enable); Pin 2 is N/C (No Connection, may be tied to GND for improved thermal dissipation).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS717185DSET, TPS71718DSET offers identical performance at 1.8 V but lacks the exact 1.85 V match required for certain image sensors; MCP1703T-185I/TT trades size and noise performance for higher current and lower cost, making it viable only in less demanding signal-chain roles.

Availability

TPS717185DSET is available at Aetrix Electronics and suitable for camera sensor power, mobile handset baseband supplies, Bluetooth® SoC cores, industrial IoT sensor nodes, and portable medical devices requiring stable component supply and long-term manufacturability.

Supply support for TPS717185DSET 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 high-reliability and low-power applications.

The TPS717 family was designed specifically for noise-sensitive, battery-powered portable electronics - emphasizing ultra-low noise, high PSRR, small footprint, and minimal quiescent current without sacrificing protection or accuracy.

FAQ

What is the minimum input voltage required for TPS717185DSET to regulate at full 150 mA load?

The minimum input voltage is determined by dropout: V_IN(MIN) = V_OUT + V_DO. With 170 mV typical dropout at 150 mA, TPS717185DSET requires ≥2.02 V input. However, per recommended operating conditions, minimum VIN is 2.5 V - ensuring regulation across all process/temperature corners and maintaining PSRR performance.

Can TPS717185DSET operate without an output capacitor?

No. TPS717185DSET requires a minimum 1 µF ceramic capacitor from OUT to GND for stability. Omitting it causes oscillation and unregulated output. The datasheet specifies 1 µF as absolute minimum; using 2.2 µF improves transient response and further lowers output impedance above 100 kHz.

Is the NR pin mandatory for TPS717185DSET operation?

No - the NR pin is optional. TPS717185DSET functions correctly without a noise reduction capacitor. However, connecting 0.01 µF between NR and GND reduces output noise by ~75% and improves PSRR above 10 kHz, which is essential for RF and precision analog applications.

Does TPS717185DSET support reverse current protection?

No. The PMOS pass transistor includes a body diode that conducts from OUT to IN if V_OUT > V_IN. This reverse conduction is not current-limited. For systems where back-driving is possible (e.g., hot-swap, multi-rail sequencing), an external Schottky diode or ideal diode controller is required to prevent reverse current.

What is the thermal performance of TPS717185DSET in its DSE package?

In the 1.5-mm × 1.5-mm WSON (DSE) package, TPS717185DSET has R_θJA = 190.5°C/W (JEDEC standard PCB) and R_θJB = 149.3°C/W. With 150 mA load and 2.5 V input (1.85 V out), power dissipation is ~97.5 mW - resulting in ~18.6°C junction-to-ambient rise. Full thermal derating begins above 125°C junction temperature.