Texas Instruments TPS72018YZUT

Overview

TPS72018YZUT from Texas Instruments is a 350 mA ultra-low VIN, RF-optimized low-dropout linear regulator with bias pin, delivering 1.8 V output at ±2% accuracy over –40°C to 125°C, 110 mV dropout at full load, and 48 μVRMS noise (10 Hz–100 kHz). It operates with dual-rail input (VIN ≥ VOUT + 0.5 V, VBIAS ≥ VOUT + 1.4 V or 2.5 V), enabling high-efficiency power architectures in RF-sensitive portable systems.

For engineers reviewing the TPS72018YZUT datasheet, TPS72018YZUT pinout, TPS72018YZUT application, or TPS72018YZUT equivalent, key selection criteria include its dual-rail architecture for efficiency optimization, bias-pin PSRR isolation (70 dB up to 10 kHz), monotonic soft-start (140 μs), and stable operation with 2.2 μF ceramic output capacitance - all critical for camera module, wireless LAN baseband, and low-power MCU core supply designs.

Technical Context

The TPS72018YZUT implements a BICMOS-based NMOS pass transistor with separate VIN and VBIAS rails: VIN supplies the main current path while VBIAS powers the control circuitry, enabling sub-1.1 V input operation and decoupling PSRR performance from input rail noise. Its feedback loop uses a precision bandgap reference and high-gain error amplifier to maintain 2% total output accuracy across load, line, temperature, and process variations.

It features dual transient response optimization: ±200 μV line transient (ΔVIN = ±400 mV, 1 μs) and ±15 mV load transient (0 → 350 mA, 1 μs), enabled by ultra-wide bandwidth design. The bias pin supports UVLO (2.45 V typ, 150 mV hysteresis) and allows IN-pin floating operation under light loads (<500 μA), sourcing regulated current directly from VBIAS - a key enabler for dynamic power-state sequencing in battery-powered devices.

Key Specifications

Pinout & Package

TPS72018YZUT is packaged in a 1.33 mm × 0.96 mm, 5-ball DSBGA (YZU) package with exposed substrate for thermal conduction. Ball pitch is 0.4 mm; no thermal pad connection required per TI recommendation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS72018YZUT, TPS71718DCKR offers smaller footprint but sacrifices 150 mA current capacity, dual-rail flexibility, and IN-floating retention; LP5907MFX-1.8/NOPB provides lower noise but lacks enable control and bias-rail PSRR isolation - making TPS72018YZUT uniquely suited for RF-aware, power-sequenced portable systems.

Availability

TPS72018YZUT is available at Aetrix Electronics and suitable for mobile camera modules, wireless LAN baseband subsystems, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS72018YZUT 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 and embedded processing technologies, with decades of LDO innovation focused on power integrity and efficiency.

The TPS720 family was designed specifically for RF-sensitive, battery-powered portable electronics - delivering ultra-low noise, dual-rail efficiency, and intelligent power-state retention in sub-2 mm² packages.

FAQ

What is the minimum input voltage required for TPS72018YZUT to regulate 1.8 V output?

The TPS72018YZUT requires VIN ≥ VOUT + 0.5 V = 2.3 V under standard operation. However, its dual-rail architecture allows VIN as low as 1.91 V (VOUT + 110 mV dropout) when VBIAS ≥ 3.2 V (VOUT + 1.4 V), enabling ultra-low headroom operation not possible with conventional LDOs. This specification is confirmed in Section 6.3 of the SBVS100E datasheet.

Can TPS72018YZUT operate with the IN pin disconnected?

Yes - the TPS72018YZUT supports IN-pin floating mode, regulating 1.8 V output with up to 500 μA load current sourced entirely from the VBIAS pin. This feature is explicitly documented in Sections 3 and 7.1 of the datasheet and is critical for maintaining memory retention or sensor bias during deep-sleep states in portable devices.

What output capacitor value is required for stability with TPS72018YZUT?

The TPS72018YZUT is stable with a minimum 2.2 μF ceramic output capacitor (X5R/X7R dielectric), as specified in Section 6.3 and validated in Figure 15 of the SBVS100E datasheet. Using smaller values risks instability and degraded transient response; larger values improve ripple suppression but do not affect stability margin.

Does TPS72018YZUT include thermal protection?

Yes - the TPS72018YZUT integrates thermal shutdown with a 160°C trip point and 140°C hysteresis (Section 6.5), plus foldback current limiting (420–800 mA). These protections activate under overload or high-temperature conditions and are fully characterized across –40°C to 125°C, ensuring robust operation in enclosed handheld enclosures.

What is the purpose of the BIAS pin on TPS72018YZUT?

The BIAS pin on TPS72018YZUT powers the internal control circuitry independently from the main VIN rail, enabling higher PSRR (70 dB at 10 kHz), lower quiescent current (38 μA), and IN-pin floating operation. It must be biased ≥ VOUT + 1.4 V or 2.5 V (whichever greater), per Section 6.3 - this separation is fundamental to the device's RF performance and efficiency advantages.