Texas Instruments TPS799L57YZYT

Overview

TPS799L57YZYT from Texas Instruments is a 200-mA, low-dropout linear regulator with fixed 5.7-V output, built-in inrush current protection, 40-μA quiescent current, and 100-mV typical dropout at full load. It operates from 2.7 V to 6.5 V input and delivers ±2% output accuracy across –40°C to 125°C for RF power supply and precision analog biasing in compact wireless modules.

For engineers reviewing the TPS799L57YZYT datasheet, TPS799L57YZYT pinout, TPS799L57YZYT application, or TPS799L57YZYT equivalent, key selection criteria include ultra-low IQ, noise-reduction (NR) pin support, DSBGA-5 package constraints, PSRR performance above 66 dB at 1 kHz, and EN-controlled inrush limiting for reliable hot-swap operation in battery-powered RF subsystems.

Technical Context

The TPS799L57YZYT uses a PMOS pass element with active pull-down (350-Ω) for overshoot detection and clamping, enabling fast transient recovery when output exceeds nominal by ≥5%. Its high-gain error amplifier and dedicated NR pin allow configurable noise filtering via external 0.01-μF capacitor, reducing output noise to 10.5 × VOUT μVRMS (10 Hz–100 kHz).

Undervoltage lockout (UVLO) activates at 1.90–2.65 V with 70-mV hysteresis, and thermal shutdown engages at 165°C (reset at 145°C). The device supports stable operation with ≥2.0-μF ceramic output capacitance and achieves 66 dB PSRR at 1 kHz under 100-mA load with CNR = 0.01 μF.

Key Specifications

Pinout & Package

TPS799L57YZYT is housed in a 1.57 mm × 1.20 mm, 5-bump DSBGA (YZY) package with bottom-side solder balls. The die-sized ball grid array enables ultra-compact PCB layouts ideal for WLAN/BT modules and wearable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPWPR and TPS7A2057PDBVR, the TPS799L57YZYT uniquely combines NR-pin noise suppression, EN-triggered inrush limiting, and DSBGA-5 footprint - making it the only option among the three qualified for space-constrained, noise-sensitive RF power rails requiring guaranteed 5.7-V accuracy and fast transient recovery.

Availability

TPS799L57YZYT is available at Aetrix Electronics and suitable for cellular front-end biasing, VCO power supply, WLAN module core logic, and industrial wireless sensor node applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production ramp.

Supply support for TPS799L57YZYT 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 and high-reliability signal-chain solutions.

The TPS799Lxx product line was designed specifically for RF and precision analog applications demanding ultra-low noise, high PSRR, and minimal quiescent current in ultra-small packages - targeting wireless infrastructure, handheld communications, and industrial IoT edge nodes.

FAQ

What is the minimum input voltage required for stable operation of the TPS799L57YZYT?

The TPS799L57YZYT requires a minimum input voltage of 2.7 V or (VOUT + VDO), whichever is greater. With a typical 100-mV dropout at 200 mA, the absolute minimum VIN is 5.8 V for full-load 5.7-V output. However, the device remains functional down to 2.7 V input at light loads, supported by its UVLO circuit that releases at 1.90–2.65 V. For reliable regulation across temperature and load, maintain VIN ≥5.85 V.

Does the TPS799L57YZYT require an external capacitor on the NR pin, and what value is recommended?

Yes, the TPS799L57YZYT's NR pin requires an external capacitor to achieve its specified low-noise performance. A 0.01-μF ceramic capacitor is recommended to reduce output noise to 10.5 × VOUT μVRMS and improve PSRR by up to 10 dB. Larger values degrade start-up speed; smaller values provide diminishing returns. The capacitor must be low-leakage (e.g., X7R) and placed close to the NR pin and GND.

Can the TPS799L57YZYT be used without connecting the EN pin, and what is the default behavior?

Yes, the TPS799L57YZYT can operate without external EN control: connecting EN directly to IN places the device in permanent enable mode. This configuration is valid and commonly used in fixed-supply applications. However, doing so forfeits inrush current protection and overshoot detection - features only activated during EN toggling. For always-on systems where those protections are unnecessary, EN-to-IN is acceptable and simplifies layout.

What is the maximum allowable output capacitance for the TPS799L57YZYT, and does it affect stability?

The TPS799L57YZYT is stable with output capacitance ≥2.0 μF and ESR <1.0 Ω; there is no defined upper limit. Larger capacitors (e.g., 10 μF) improve transient response but increase start-up time and may cause longer undershoot recovery. Stability is maintained across the full range because the device's internal compensation is optimized for ceramic capacitors - no series resistance or minimum ESR is required, unlike older LDO architectures.

How does the TPS799L57YZYT handle reverse voltage conditions between IN and OUT pins?

The TPS799L57YZYT contains a PMOS pass transistor with an intrinsic body diode conducting from OUT to IN. During reverse voltage (VOUT > VIN), this diode becomes forward-biased and conducts uncontrolled current - which is not limited by the device's internal current protection. To prevent damage or system malfunction, external reverse-voltage protection (e.g., a series Schottky diode or ideal diode controller) must be added if OUT may exceed IN during power sequencing or fault conditions.