Texas Instruments TPS79927YZUT

Overview

TPS79927YZUT from Texas Instruments is a 200-mA, fixed 2.7-V output, low-dropout linear regulator with enable (EN), ultralow noise (10.5 × V_OUT μV_RMS), high PSRR (66 dB at 1 kHz), and 40-μA quiescent current - designed for powering RF circuitry such as VCOs and WLAN front-ends in space-constrained portable devices.

For engineers reviewing the TPS79927YZUT datasheet, TPS79927YZUT pinout, TPS79927YZUT application, or TPS79927YZUT equivalent, this device is selected for ultra-low-noise biasing of sensitive analog/RF stages where dropout voltage ≤100 mV at 200 mA, ±2% output accuracy over –40°C to +125°C, and stability with ≥2-μF ceramic output capacitance are critical design requirements.

Technical Context

The TPS79927YZUT uses a PMOS pass element and high-gain error amplifier to achieve 100-mV dropout at 200 mA while maintaining 66 dB PSRR at 1 kHz and 51 dB at 10 kHz. Its noise-reduction (NR) pin accepts a 0.01-μF capacitor to bypass bandgap reference noise, reducing output noise to 10.5 × V_OUT μV_RMS (28.4 μV_RMS at 2.7 V).

It features inrush current limiting during EN toggle start-up, overshoot detection with active pulldown (~350 Ω), undervoltage lockout (UVLO) with 2.2-V threshold and 70-mV hysteresis, and thermal shutdown at 165°C - all fully specified across –40°C to +125°C junction temperature.

Key Specifications

Pinout & Package

TPS79927YZUT is packaged in a 5-bump, thin, 0.97-mm × 1.34-mm DSBGA (YZU) package - die-sized ball grid array optimized for ultra-compact RF modules and wearable PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79927YZUT, TPS79927DDCR offers identical regulation performance in a larger, more manufacturable package, while LP5907MFX-2.7/NOPB trades PSRR and enable functionality for lower noise and quiescent current - making TPS79927YZUT the balanced choice for RF power integrity where both noise and ripple rejection matter.

Availability

TPS79927YZUT is available at Aetrix Electronics and suitable for wireless LAN front-ends, VCO power supplies, and wearable sensor hubs requiring stable component supply, long-term lifecycle support, and traceable sourcing for high-reliability designs.

Supply support for TPS79927YZUT 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, embedded processing, and power management ICs, with leadership in high-performance power regulation and signal chain solutions.

The TPS799 product line delivers ultralow-noise, high-PSRR LDOs for RF, precision analog, and portable applications - engineered to replace legacy regulators in noise-critical bias rails without compromising efficiency or size.

FAQ

What is the dropout voltage specification for TPS79927YZUT at full load?

The TPS79927YZUT has a typical dropout voltage of 100 mV at 200 mA output current and 25°C junction temperature. At worst-case conditions (–40°C to +125°C, V_OUT ≤ 3.3 V), dropout is specified up to 175 mV. This allows reliable 2.7-V regulation from a 2.97-V minimum input, making it suitable for single-cell Li-ion or Li-poly systems with tight voltage margins. The TPS79927YZUT uses a PMOS pass device to achieve this low dropout while maintaining high PSRR.

Does TPS79927YZUT require an external noise-reduction capacitor?

Yes - the TPS79927YZUT includes an NR (noise reduction) pin specifically for connecting an external capacitor (typically 0.01 μF) to reduce output noise. With this capacitor, total integrated output noise is reduced to 10.5 × V_OUT μV_RMS (28.4 μV_RMS at 2.7 V). Without it, noise rises to ~94 × V_OUT μV_RMS. The NR pin is high-impedance, so low-leakage ceramic capacitors are required. The TPS79927YZUT's internal quick-start circuit charges this capacitor within 135 μs at power-up.

What is the maximum input voltage rating for TPS79927YZUT?

The absolute maximum input voltage for TPS79927YZUT is 7.0 V, but the recommended operating range is 2.7 V to 6.5 V. Operation below 2.7 V is limited by dropout: minimum input must be ≥ V_OUT + V_DO = 2.8 V at 200 mA. Exceeding 6.5 V risks violating recommended conditions and may impact reliability or PSRR performance. The TPS79927YZUT also includes undervoltage lockout (UVLO) that disables regulation until VIN rises above 2.2 V (typical), with 70-mV hysteresis.

How does the enable (EN) pin function on TPS79927YZUT?

The EN pin on TPS79927YZUT is active-high and TTL/CMOS-compatible: driving it above 1.2 V enables regulation, while pulling it below 0.4 V places the device in shutdown mode with only 150 nA (typical) shutdown current. When unused, EN may be tied directly to IN. The TPS79927YZUT implements inrush current protection during EN toggle - immediately clamping output current at startup to prevent input rail collapse. This behavior is intrinsic to the TPS79927YZUT's internal architecture and requires no external circuitry.

Is TPS79927YZUT stable with ceramic output capacitors?

Yes - the TPS79927YZUT is explicitly designed and tested for stability with standard 2.2-μF or larger ceramic output capacitors (X5R/X7R dielectrics), requiring no series ESR. Minimum recommended capacitance is 2.2 μF with ESR < 1.0 Ω. Unlike many older LDOs, it does not require tantalum or aluminum electrolytic capacitors. This simplifies layout, improves reliability, and reduces board area - a key advantage of the TPS79927YZUT in space-constrained RF modules and wearables.