Texas Instruments TPS799L54YZYT

Overview

TPS799L54YZYT from Texas Instruments is a 200-mA, low-dropout linear regulator with fixed 5.4-V output, 100-mV typical dropout at full load, 40-μA ground current, and integrated inrush current protection triggered by EN toggle. It operates from 2.7 V to 6.5 V input and delivers ±2% output accuracy across –40°C to 125°C, targeting RF power stages and precision analog supply rails in compact wireless modules.

For engineers reviewing the TPS799L54YZYT datasheet, TPS799L54YZYT pinout, TPS799L54YZYT application, or TPS799L54YZYT equivalent, key selection criteria include its DSBGA-5 (1.57 mm × 1.20 mm) package, NR-pin–enabled noise reduction (<90 μVRMS with 0.01-μF CNR), 66-dB PSRR at 1 kHz, and verified thermal shutdown (165°C trip) for reliable operation in thermally constrained handheld designs.

Technical Context

The TPS799L54YZYT employs a PMOS pass element with active pull-down (350-Ω equivalent) for overshoot control and uses a high-gain error amplifier to maintain regulation under fast line/load transients. Its noise-reduction (NR) pin bypasses bandgap reference noise and enables sub-100-μVRMS output noise when paired with a 0.01-μF ceramic capacitor.

Startup behavior is controlled by an internal 135-μs switch that precharges the NR capacitor; EN toggling initiates immediate inrush current clamping (220–600 mA peak limit). UVLO (2.2 V nominal) and thermal shutdown (165°C/145°C hysteresis) are fully integrated, eliminating external protection circuitry.

Key Specifications

Pinout & Package

TPS799L54YZYT is housed in a 5-bump, thin DSBGA package (1.57 mm × 1.20 mm body size, YZY suffix), optimized for space-constrained RF modules and WLAN cards. The die-sized ball grid array provides low thermal resistance (RθJA = 143.3°C/W) and minimal PCB footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TESK and TPS7A2054PDBVR, the TPS799L54YZYT uniquely combines 5.4-V precision output, integrated inrush current limiting on EN toggle, and NR-pin–enabled sub-100-μVRMS noise-making it the only option among the three validated for RF VCO and PA bias applications demanding simultaneous low noise, fast transient control, and compact DSBGA packaging.

Availability

TPS799L54YZYT is available at Aetrix Electronics and suitable for cellular RF front-ends, Bluetooth® LE sensor nodes, and handheld medical diagnostics requiring stable component supply, long-term lifecycle support, and traceable sourcing for Class II medical device production.

Supply support for TPS799L54YZYT 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 technologies, with leadership in power management ICs for industrial, automotive, and communications markets.

The TPS799Lxx family was designed specifically for RF and precision analog applications requiring ultra-low noise, high PSRR, and compact packaging in wireless handsets, WLAN cards, and portable instrumentation.

FAQ

What is the maximum input voltage rating for the TPS799L54YZYT?

The TPS799L54YZYT has an absolute maximum input voltage rating of 7.0 V. However, its recommended operating input range is 2.7 V to 6.5 V. Exceeding 6.5 V may cause excessive power dissipation or violate thermal limits, especially at high ambient temperatures or full 200-mA load. Operation above 7.0 V risks permanent damage per the Absolute Maximum Ratings table in the SBVS191B datasheet.

Does the TPS799L54YZYT require an external capacitor on the NR pin to achieve specified noise performance?

Yes, the TPS799L54YZYT requires a 0.01-μF ceramic capacitor between the NR pin and GND to achieve its specified 90-μVRMS output noise (10 Hz–100 kHz). Without this capacitor, output noise rises to 94 × VOUT μVRMS (≈508 μVRMS), degrading performance in noise-sensitive applications like VCOs and high-resolution ADCs. The NR capacitor must be low-leakage (e.g., X7R) and placed close to the NR pin.

Can the TPS799L54YZYT be used without connecting the EN pin?

Yes, the TPS799L54YZYT can operate without external EN control: the EN pin may be tied directly to the IN supply rail. This configures the device for always-on operation. However, doing so disables inrush current protection and overshoot detection features activated only during EN toggling. For applications requiring sequenced power-up or fault containment, active EN control is strongly recommended.

What is the minimum output capacitance required for stability with the TPS799L54YZYT?

The TPS799L54YZYT requires a minimum output capacitance of 2.0 μF, using X5R or X7R ceramic capacitors with ESR less than 1.0 Ω. A typical design uses a 2.2-μF, 10-V, X7R capacitor placed within 10 mm of the OUT and GND pins. Using lower capacitance or higher-ESR types (e.g., Y5V, aluminum electrolytic) risks instability, increased output ripple, and degraded transient response.

How does the TPS799L54YZYT handle reverse voltage conditions at the OUT pin?

The TPS799L54YZYT contains a PMOS pass transistor with an intrinsic body diode that conducts when VOUT exceeds VIN. This reverse conduction is **not current-limited**, meaning uncontrolled reverse current can flow and potentially damage the device or upstream circuitry. To prevent this, external reverse-voltage protection (e.g., a series Schottky diode or ideal diode controller) is required in applications where VOUT may exceed VIN during power-down or hot-swap events.