Texas Instruments TPS72015YZUR

Overview

TPS72015YZUR from Texas Instruments is a 350 mA ultra-low VIN, RF-optimized low-dropout linear regulator with dual-rail bias architecture, delivering 1.5 V output at ±2% accuracy over –40°C to 125°C, 110 mV dropout at full load, and 48 μV_RMS output noise (10 Hz–100 kHz) for powering RF analog circuitry in portable wireless systems.

For engineers reviewing the TPS72015YZUR datasheet, TPS72015YZUR pinout, TPS72015YZUR application, or TPS72015YZUR equivalent, key selection criteria include its bias-pin efficiency architecture, sub-1.8 V operation capability, 38 μA quiescent current, monotonic soft-start with 100 mA + I_LOAD inrush limiting, and stability with 2.2 μF ceramic output capacitor - all critical for battery-powered RF subsystems requiring low-noise, fast transient response, and dynamic power-state management.

Technical Context

The TPS72015YZUR implements a dual-rail BICMOS LDO architecture where the main power path (IN) operates as low as V_OUT + 0.5 V, while the control circuitry is powered independently via the BIAS pin (≥V_OUT + 1.4 V or ≥2.5 V). This decoupling enables high PSRR (80 dB at 10 kHz on VIN, 70 dB on VBIAS) and low-noise regulation even when IN is supplied by an efficient but noisy DC-DC converter.

It features a novel light-load regulation mode: when IN is floating, the device draws up to 500 μA from BIAS to maintain regulated 1.5 V output - enabling seamless transition between active and deep-sleep states in camera phones and WLAN modules without external sequencing logic.

Key Specifications

Pinout & Package

TPS72015YZUR is packaged in a 1.33 mm × 0.96 mm, 5-ball DSBGA (YZU) package with bottom-side solder balls and no exposed thermal pad. The package is optimized for ultra-thin mobile applications and requires standard reflow profiles per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS72015YZUR, the TPS72018YZUR offers identical performance at 1.8 V but demands higher BIAS voltage, while the TPS79515DBVR sacrifices efficiency, noise performance, and advanced power-management features for lower cost and simpler implementation - making TPS72015YZUR the optimal choice for RF-sensitive, battery-constrained handheld systems requiring dynamic power-state agility.

Availability

TPS72015YZUR is available at Aetrix Electronics and suitable for cellular camera phones, wireless LAN modules, and handheld medical devices requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for production ramp and field deployment.

Supply support for TPS72015YZUR 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 technologies, with decades of expertise in high-reliability, low-power, and RF-optimized IC design.

The TPS720 family was engineered specifically for ultra-low-noise, dual-rail power management in space-constrained portable RF systems - enabling efficient coexistence of high-efficiency DC-DC converters and sensitive analog circuitry through innovative BIAS-pin architecture.

FAQ

What is the minimum input voltage required for TPS72015YZUR to regulate 1.5 V output?

The TPS72015YZUR requires a minimum steady-state input voltage (VIN) of V_OUT + 0.5 V = 2.0 V under recommended operating conditions. This ultra-low VIN capability allows direct operation from partially discharged single-cell Li-ion batteries or the output of high-efficiency buck converters, maximizing system energy utilization. The device will not regulate below this threshold, regardless of BIAS voltage level.

Can TPS72015YZUR operate with the IN pin disconnected while still regulating 1.5 V output?

Yes - the TPS72015YZUR supports a unique floating-IN mode where it regulates 1.5 V output using only the BIAS pin, delivering up to 500 μA to the load. This feature is explicitly designed for power-saving scenarios such as disabling a primary DC-DC converter while maintaining LDO output for memory retention or real-time clock backup, and is fully characterized in the datasheet for the YZU package.

What output capacitor value and type are required for stable operation of TPS72015YZUR?

The TPS72015YZUR is stable with a minimum 2.2 μF ceramic output capacitor - specifically X5R or X7R dielectrics - placed close to the OUT and GND pins. These capacitors provide low ESR (<250 mΩ) and minimal capacitance shift over temperature, ensuring robust transient response and loop stability. Tantalum or aluminum electrolytic capacitors are not recommended due to higher ESR and reliability concerns.

Does TPS72015YZUR include built-in protection features?

Yes, the TPS72015YZUR integrates overcurrent protection with a current limit of 420–800 mA and thermal shutdown that activates at 160°C (with 20°C hysteresis). It also features undervoltage lockout (UVLO) on the BIAS pin (2.41–2.49 V turn-on threshold) and soft-start circuitry that limits inrush current to 100 mA + I_LOAD, protecting both the LDO and downstream circuitry during power-up and fault conditions.

How does the BIAS pin function in TPS72015YZUR, and what voltage must it be supplied with?

The BIAS pin powers the internal control circuitry of the TPS72015YZUR independently from the main IN rail. It must be supplied with ≥2.5 V or ≥V_OUT + 1.4 V - i.e., ≥2.9 V for the 1.5 V output - and can go as high as 5.5 V. This architecture enables high PSRR and low-noise regulation even when IN is sourced from a noisy, high-efficiency DC-DC converter, and is essential for enabling the floating-IN light-load regulation mode.