Texas Instruments TPS71726DCKR

Overview

TPS71726DCKR from Texas Instruments is a fixed-output, low-noise, high-PSRR linear regulator delivering 2.6 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 circuitry in portable imaging and wireless systems.

For engineers reviewing the TPS71726DCKR datasheet, TPS71726DCKR pinout, TPS71726DCKR application, or TPS71726DCKR equivalent, key selection criteria include ultra-low noise performance with optional NR capacitor support, SC-70-5 package footprint constraints, 45 µA quiescent current, and guaranteed 3% output accuracy across –40°C to 125°C junction temperature.

Technical Context

The TPS71726DCKR uses a PMOS pass device and advanced BiCMOS process to achieve fast startup, excellent transient response, and high PSRR down to low headroom (VIN – VOUT = 1 V). Its error amplifier features precision voltage reference and feedback loop stabilization with 1-µF ceramic output capacitance.

Fixed-output variants integrate a dedicated noise reduction (NR) pin tied to an internal bandgap reference; a quick-start circuit charges the external CNR capacitor (e.g., 0.01 µF) in ~160 µs to minimize startup delay while suppressing reference noise - critical for camera sensor biasing where spectral purity and turn-on timing are co-constrained.

Key Specifications

Pinout & Package

TPS71726DCKR is packaged in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for ultra-compact PCB layouts in mobile and wearable applications. 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 TPS71726DCKR, TPS7A0526PDQNR trades PSRR and noise performance for lower quiescent current, while MCP1700T-2602E/MB sacrifices thermal safety and high-frequency rejection for cost - making TPS71726DCKR the only choice meeting simultaneous low-noise, high-PSRR, and full-automotive-temp requirements in space-constrained imaging systems.

Availability

TPS71726DCKR is available at Aetrix Electronics and suitable for camera sensor power, mobile phone baseband subsystems, wireless LAN front-ends, and portable medical imaging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS71726DCKR 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 precision power management ICs.

The TPS717 family was engineered specifically for noise-sensitive, battery-powered applications - combining ultra-low IQ, high PSRR, and miniature packaging to enable next-generation mobile imaging and wireless edge devices.

FAQ

What is the minimum input voltage required for TPS71726DCKR to regulate at full 150 mA output?

The TPS71726DCKR requires VIN ≥ VOUT + VDO = 2.6 V + 0.17 V = 2.77 V (typical) to sustain 150 mA output. Per datasheet Section 6.3, the absolute minimum VIN is 2.5 V, but operation below 2.77 V results in dropout - where output voltage drops linearly with input. For reliable 150 mA regulation, maintain VIN ≥ 2.77 V across all operating conditions including worst-case temperature and line tolerance. The TPS71726DCKR's UVLO threshold (2.45 V) ensures safe disable below functional input range.

Can TPS71726DCKR operate without the noise reduction (NR) capacitor, and what is the impact on output noise?

Yes, TPS71726DCKR functions without the NR capacitor, but output noise increases significantly: 95 × VOUT µV_RMS (≈250 µV_RMS for 2.6 V) with CNR = open, versus 12.5 × VOUT µV_RMS (≈32.5 µV_RMS) with CNR = 0.01 µF. The NR pin connects directly to the bandgap reference; omitting CNR removes high-frequency noise filtering, degrading SNR in analog signal chains. For camera sensors or RF VCOs, the 0.01 µF ceramic capacitor is strongly recommended to achieve the specified 30 µV_RMS performance.

Is TPS71726DCKR pin-compatible with other members of the TPS717 family, such as TPS71733DCKR?

No - all TPS717xxDCKR variants share identical SC-70-5 pinout (IN, GND, EN, NR, OUT), but output voltage is laser-trimmed during manufacturing and not user-selectable. TPS71733DCKR delivers 3.3 V instead of 2.6 V; substituting it for TPS71726DCKR will overvoltage downstream 2.6 V logic. Electrical characteristics (PSRR, noise, dropout) are consistent across fixed-output versions, but voltage-specific parameters like load regulation and thermal behavior scale with VOUT. Always verify VOUT tolerance and downstream voltage ratings before interchange.

Does TPS71726DCKR include reverse current protection, and how does it behave if VOUT exceeds VIN?

TPS71726DCKR does not include active reverse current protection. Its PMOS pass transistor has an intrinsic body diode that conducts from OUT to IN when VOUT > VIN - potentially back-driving upstream supplies. This condition is not fault-protected; sustained reverse bias may damage upstream regulators or violate system-level isolation requirements. To prevent reverse current, add an external Schottky diode in series with IN or use a load switch. The datasheet explicitly deletes "Reverse Current Protection" from Revision H onward, confirming its absence.

What is the maximum allowable output capacitance for TPS71726DCKR, and does larger COUT improve stability?

The TPS71726DCKR is stable with output capacitance from 1 µF to 100 µF (per Section 6.3), but increasing COUT beyond 1 µF provides diminishing returns for stability while degrading transient response and startup time. Larger capacitors (e.g., 10–100 µF) reduce output ripple under heavy load steps but increase inrush current and slow voltage ramp-up - problematic for camera sensor power sequencing. The 1 µF minimum is optimized for phase margin; X5R/X7R ceramics are mandatory. Tantalum or aluminum electrolytics are not recommended due to ESR and aging effects.