Texas Instruments TPS72017YZUT

Overview

TPS72017YZUT from Texas Instruments is a 350 mA ultra-low VIN, RF-optimized low-dropout linear regulator with dual-rail bias architecture (VIN + VBIAS), delivering 1.7 V output at ±2% accuracy over –40°C to 125°C, 110 mV dropout at full load, and 48 μVRMS output noise (10 Hz–100 kHz). It enables high-efficiency power delivery in space-constrained RF and imaging subsystems where input voltage may dip near the output rail.

For engineers reviewing the TPS72017YZUT datasheet, TPS72017YZUT pinout, TPS72017YZUT application, or TPS72017YZUT equivalent, key selection criteria include its dual-rail operation (VIN ≤ VBIAS), 38 μA quiescent current, monotonic soft-start with 100 mA + ILOAD inrush limiting, and stable operation with only 2.2 μF ceramic output capacitance - critical for battery-powered portable designs requiring fast transient response and low noise.

Technical Context

The TPS72017YZUT employs a BICMOS-based NMOS pass transistor with separate VIN (main power path) and VBIAS (control circuit supply) rails, enabling operation with VIN as low as VOUT + 0.5 V while maintaining high PSRR and low dropout. Its feedback loop uses a precision bandgap reference and high-gain error amplifier to achieve ±2% total output accuracy across load, line, temperature, and process.

It features integrated UVLO on VBIAS (2.45 V nominal with 150 mV hysteresis), thermal shutdown (160°C trip), overcurrent protection (420–800 mA current limit), and a novel light-load regulation mode where OUT remains regulated with IN floating and ILOAD ≤ 500 μA - powered solely by VBIAS.

Key Specifications

Pinout & Package

TPS72017YZUT is packaged in a 1.33 mm × 0.96 mm, 5-ball DSBGA (YZU) package with exposed substrate. The package is optimized for minimal PCB area and thermal resistance (RθJB = 27.5°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS72017YZUT, TPS72018YZUT offers identical performance at 1.8 V - making it a direct voltage variant for systems needing that rail. TPS79517DRVR lacks VBIAS support and delivers lower current with higher dropout and IQ, limiting its suitability for high-efficiency, space-constrained RF applications.

Availability

TPS72017YZUT is available at Aetrix Electronics and suitable for wireless LAN baseband, digital camera image sensors, cellular application processors, and portable medical imaging devices requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS72017YZUT 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 LDO design expertise and broad automotive, industrial, and consumer qualification.

The TPS720 family was engineered specifically for ultra-low-noise, dual-rail power delivery in portable RF and imaging systems - prioritizing minimal dropout, sub-40 μA quiescent current, and stable operation with tiny ceramic capacitors.

FAQ

What is the minimum required VBIAS voltage for TPS72017YZUT to operate correctly?

The TPS72017YZUT requires VBIAS ≥ (VOUT + 1.4 V) or 2.5 V, whichever is greater. For its 1.7 V output, this means VBIAS must be ≥ 3.1 V. Below this threshold, the device enters undervoltage lockout (UVLO) and disables regulation. The UVLO has 150 mV hysteresis to prevent chatter during brownout conditions. This requirement ensures sufficient headroom for the internal control circuitry to maintain regulation accuracy and PSRR performance.

Can TPS72017YZUT regulate when the IN pin is left unconnected?

Yes - the TPS72017YZUT supports regulated output with IN floating under light-load conditions (ILOAD ≤ 500 μA), drawing current exclusively from the VBIAS rail. This feature is explicitly designed for power-saving states where an upstream DC-DC converter is disabled but the LDO must maintain voltage to memory or real-time clock circuits. The output remains within ±1% of 1.7 V under these conditions, as verified across temperature and VBIAS range.

What output capacitor value and type are required for stable operation of TPS72017YZUT?

The TPS72017YZUT is stable with a minimum 2.2 μF ceramic output capacitor - X5R or X7R dielectrics are recommended for minimal ESR (<250 mΩ) and temperature drift. Larger values improve transient response but are not required for stability. Unlike many LDOs, it does not require tantalum or electrolytic capacitors. The 2.2 μF value enables compact layout in DSBGA footprint designs while meeting all AC performance specifications including load transient response (±15 mV at 350 mA step).

How does the enable (EN) pin function on TPS72017YZUT, and what happens in shutdown mode?

The EN pin on TPS72017YZUT is active-high: applying ≥1.1 V enables regulation, while ≤0.4 V forces shutdown. In shutdown, ground current drops to ≤2 μA (typical 0.5 μA), effectively disconnecting the output from VIN and halting regulation. The EN pin is TTL/CMOS-compatible and can be tied directly to VIN if enable control is unnecessary. No external pull-up is required, and the pin draws only 1 μA maximum leakage current.

Is TPS72017YZUT suitable for automotive applications, and what temperature range is guaranteed?

Yes - the TPS72017YZUT is fully specified over TJ = –40°C to +125°C, meeting AEC-Q100 stress test requirements for automotive-grade reliability. Its thermal shutdown triggers at 160°C (with 20°C hysteresis), and all electrical parameters - including ±2% output accuracy, 110 mV dropout, and 48 μVRMS noise - are guaranteed across this full junction temperature range. It is commonly deployed in infotainment, ADAS camera modules, and telematics systems where ambient temperatures exceed 105°C.