Texas Instruments TPS799125YZUT

Overview

TPS799125YZUT from Texas Instruments is a 200-mA, low-quiescent-current, ultralow-noise, high-PSRR low-dropout linear regulator in a 5-bump DSBGA package (1.34 mm × 0.97 mm), delivering fixed 1.25 V output with ±2% accuracy over –40°C to +125°C, 100 mV dropout at 200 mA, and 40 μA ground current - optimized for RF power supply filtering in wearable electronics and wireless LAN modules.

For engineers reviewing the TPS799125YZUT datasheet, TPS799125YZUT pinout, TPS799125YZUT application, or TPS799125YZUT equivalent, key selection criteria include its 66 dB PSRR at 1 kHz, 2-μF ceramic capacitor stability, EN-controlled inrush protection, noise-reduction (NR) pin support, and operation down to 2.7 V input with thermal shutdown and UVLO.

Technical Context

The TPS799125YZUT uses a PMOS pass element with advanced BiCMOS process to achieve 100 mV dropout at full 200 mA load while maintaining 40 μA quiescent current. Its high-gain, high-bandwidth error amplifier enables 66 dB PSRR at 1 kHz and excellent line/load transient response via active pulldown (350 Ω) on 5% overshoot detection.

It integrates inrush current limiting on EN toggle, undervoltage lockout (1.9–2.65 V threshold with 70 mV hysteresis), thermal shutdown (165°C trip), and a precision 1.193 V internal reference. The NR pin supports external 0.01 μF bypassing to reduce bandgap noise contribution, enabling <13.1 μV_RMS output noise at 1.25 V output.

Key Specifications

Pinout & Package

TPS799125YZUT is housed in a 5-bump, thin, die-sized ball grid array (DSBGA) package measuring 1.34 mm × 0.97 mm with 0.4-mm pitch. The package features a bottom-side thermal pad tied to GND for enhanced thermal performance (R_θJB = 84.7°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS799125YZUT, the TPS799125DDCR offers identical regulation performance in a more manufacturable package but sacrifices 60% board area efficiency and thermal performance, while the ADP160ACBZ-1.25-R7 trades current capacity and protection features for ultra-low IQ - making TPS799125YZUT the optimal balance for noise-sensitive, thermally constrained 200-mA RF applications.

Availability

TPS799125YZUT is available at Aetrix Electronics and suitable for wearable electronics, wireless LAN coexistence modules, Bluetooth® LE transceivers, and VCO bias supplies requiring stable component supply across industrial and consumer production volumes.

Supply support for TPS799125YZUT 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 company specializing in analog and embedded processing solutions, with leadership in power management ICs and high-reliability signal chain components.

The TPS799 product line delivers ultralow-noise, high-PSRR LDOs for RF, precision analog, and portable applications - designed specifically to replace noisy switching regulators in sensitive power domains without sacrificing efficiency or size.

FAQ

What is the maximum input voltage rating for TPS799125YZUT?

The absolute maximum input voltage for TPS799125YZUT is 7.0 V, but recommended operating conditions specify VIN between 2.7 V and 6.5 V. Exceeding 6.5 V may trigger internal protection circuits or degrade long-term reliability. For 1.25 V output, minimum valid input is 1.35 V (V_OUT + V_DO), though 2.7 V is the practical lower bound per datasheet limits. Always observe thermal derating above 125°C junction temperature.

Does TPS799125YZUT require an input capacitor for stability?

TPS799125YZUT does not require an input capacitor for stability, but TI recommends a 0.1–1 μF low-ESR ceramic capacitor near the IN pin to improve transient response, reduce source impedance, and enhance PSRR - especially when powered from a high-impedance or switched supply. This capacitor is optional but strongly advised in production designs with fast load steps or shared input rails.

How does the NR pin function on TPS799125YZUT?

The NR pin on TPS799125YZUT is specific to fixed-output variants and provides a dedicated connection to bypass noise from the internal bandgap reference. When a 0.01 μF ceramic capacitor is placed between NR and GND, total output noise drops to 13.1 μV_RMS (10 Hz–100 kHz). The NR pin is high-impedance; use low-leakage capacitors, and avoid values >0.01 μF to ensure full charging within the 135 μs quick-start window.

Can TPS799125YZUT be used without connecting the EN pin?

Yes, TPS799125YZUT can operate without external EN control: tie EN directly to IN to enable the device permanently. In this configuration, the regulator powers up with VIN and remains active until VIN drops below UVLO threshold (~2.2 V). However, doing so forfeits inrush current limiting and shutdown capability - critical for battery-powered systems where controlled power sequencing is required.

What is the thermal performance of TPS799125YZUT in its YZU package?

TPS799125YZUT in the YZU (DSBGA) package has R_θJA = 143.3°C/W, R_θJB = 84.7°C/W, and R_θJC(top) = 1.1°C/W. With the thermal pad soldered to a 1-in² 1-oz copper plane, it can dissipate ~350 mW continuously at +70°C ambient before reaching 125°C junction. Derate linearly above 70°C ambient; full 200 mA load is sustainable only with adequate PCB copper and airflow.