Texas Instruments TPS71715DCKT

Overview

TPS71715DCKT from Texas Instruments is a fixed-output, 1.5-V low-dropout linear regulator with PMOS pass device, 170-mV typical dropout at 150 mA, 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 TPS71715DCKT datasheet, TPS71715DCKT pinout, TPS71715DCKT application, or TPS71715DCKT equivalent, key selection criteria include ultra-low noise performance under light-to-moderate loads, SC-70-5 package footprint constraints, enable-controlled power sequencing, and compatibility with 1-μF ceramic output capacitance without external compensation.

Technical Context

The TPS71715DCKT employs a high-gain, high-bandwidth BiCMOS error amplifier driving a PMOS pass transistor to achieve fast transient response and maintain stability with minimal 1-μF ceramic output capacitance. Its architecture integrates a precision 1.20-V band-gap reference and a dedicated noise reduction (NR) pin that filters reference noise via an external 0.01-μF capacitor.

It features active UVLO (2.45 V rising threshold), thermal shutdown (160°C trip), overcurrent protection, and a quick-start circuit that charges the NR capacitor within ~160 μs - enabling rapid turn-on while preserving low-noise operation. The SC-70-5 package supports compact layout in space-constrained handheld devices.

Key Specifications

Pinout & Package

TPS71715DCKT is packaged in a 5-pin SC-70 (DCK) package, measuring 2.00 mm × 1.25 mm with 0.65-mm lead pitch. The package is surface-mount, moisture-sensitive level 1 (MSL-1), and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS71715DCKT, TPS79915DBVR offers higher current headroom and deeper shutdown, while MCP1700T-1502E/MB trades off noise/PSRR performance for cost and ultra-low I_Q; TPS71715DCKT remains optimal where 30-μV_RMS noise and 70-dB PSRR at 1 kHz are mandatory.

Availability

TPS71715DCKT is available at Aetrix Electronics and suitable for camera sensor power, portable RF front-end biasing, and wearable biopotential monitoring requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for TPS71715DCKT 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 ICs, with decades of expertise in high-reliability, high-performance power solutions.

The TPS717 family was engineered specifically for ultra-low-noise, low-quiescent-current regulation in battery-powered portable electronics - targeting applications where PSRR, noise, and footprint are critical constraints.

FAQ

What is the minimum input voltage required for TPS71715DCKT to regulate at 1.5 V?

The TPS71715DCKT requires a minimum input voltage of 1.67 V (1.5 V + 170 mV typical dropout) to maintain regulation at full 150-mA load. However, per datasheet Recommended Operating Conditions, VIN must be ≥2.5 V regardless of VOUT - meaning TPS71715DCKT cannot be operated below 2.5 V input even at light loads. This constraint ensures proper UVLO and internal bias functionality.

Can TPS71715DCKT operate without the NR capacitor?

Yes, TPS71715DCKT functions without the NR capacitor, but output noise increases significantly: from 30 μV_RMS (with 0.01-μF CNR) to ~95×VOUT ≈ 143 μV_RMS. PSRR above 10 kHz also degrades. The NR pin is internally connected to the band-gap reference; leaving it open or floating is not recommended - tie to GND if unused, though noise performance will remain degraded.

Is TPS71715DCKT stable with a 2.2-μF X5R ceramic output capacitor?

Yes, TPS71715DCKT is explicitly characterized and guaranteed stable with 1-μF to 100-μF ceramic output capacitors, including 2.2-μF X5R types. Larger values improve load transient response and reduce output impedance at low frequencies, but do not affect phase margin - the regulator's internal compensation is optimized for this capacitance range and ESR < 10 mΩ.

Does TPS71715DCKT support reverse current protection?

No, TPS71715DCKT does not integrate reverse current protection. Its PMOS pass transistor includes a body diode that conducts from OUT to IN when V_OUT > V_IN, potentially allowing backfeed. If reverse current must be blocked (e.g., in OR-ing or hot-swap configurations), an external Schottky diode or ideal diode controller is required in series with the IN pin.

What is the thermal resistance (R_θJA) of the TPS71715DCKT in its SC-70-5 package?

The junction-to-ambient thermal resistance (R_θJA) for TPS71715DCKT in the DCK (SC-70-5) package is 279.2°C/W, as specified in the Thermal Information table. This value assumes standard JEDEC 2-layer board conditions (1-in² copper pad). Actual thermal performance depends heavily on PCB layout - adding thermal vias under the exposed pad (if present) or increasing copper area can reduce effective R_θJA by 30–50%.