Texas Instruments LP5900TLX-2.75/NOPB

Overview

LP5900TLX-2.75/NOPB from Texas Instruments is a 150-mA ultra-low-noise LDO regulator designed for RF and analog circuits, delivering 2.75 V output with ±2% tolerance, 6.5 μV_RMS output noise, 75 dB PSRR at 1 kHz, and 80 mV typical dropout voltage. It operates from 2.5 V to 5.5 V input and supports stable regulation with only 0.47-μF ceramic input/output capacitors-no noise bypass capacitor required-making it ideal for space-constrained cellular phone power rails.

For engineers reviewing the LP5900TLX-2.75/NOPB datasheet, LP5900TLX-2.75/NOPB pinout, LP5900TLX-2.75/NOPB application, or LP5900TLX-2.75/NOPB equivalent, key selection criteria include low-noise performance in RF biasing, minimal external component count, thermal shutdown behavior at 160°C, enable control thresholds (V_IL = 0.4 V, V_IH = 1.2 V), and compatibility with DSBGA-4 (YZR) packaging for high-density PCB layouts.

Technical Context

The LP5900TLX-2.75/NOPB employs an internal bandgap reference filtered by an on-die RC network to suppress reference noise before amplification, eliminating need for external noise-bypass capacitors. Its error amplifier drives a PMOS pass transistor with 80 mV typical dropout at 150 mA, enabling operation with minimal VIN–VOUT headroom.

Enable functionality is implemented via a logic-controlled input with internal 1-MΩ pull-down resistor; device enters <1 µA quiescent state when EN ≤ 0.4 V and fully enables at EN ≥ 1.2 V. Thermal protection activates at ~160°C junction temperature with ~20°C hysteresis, cycling output to prevent permanent damage under sustained overload.

Key Specifications

Pinout & Package

LP5900TLX-2.75/NOPB uses the DSBGA-4 (YZR) package: 1.108 mm × 1.083 mm body size, bottom-side thermal pad, no leaded pins. Requires solder paste stencil optimization and reflow profile adherence per AN-1112.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPGEDR and TPS7A20275PDBVR, LP5900TLX-2.75/NOPB uniquely balances 2.5-V minimum input, 6.5-μV_RMS noise, and 0.47-μF capacitor compatibility - making it the only validated choice for RF LDO applications requiring full 2.5–5.5 V input range and sub-10-μV noise at 2.75 V output.

Availability

LP5900TLX-2.75/NOPB is available at Aetrix Electronics and suitable for cellular transceiver bias, wireless LAN RF front-end, portable audio ADC/DAC core, and industrial sensor signal chain applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for LP5900TLX-2.75/NOPB 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, signal chain, and interface ICs for industrial, automotive, and communications markets.

LP5900TLX-2.75/NOPB belongs to TI's ultra-low-noise LDO family engineered specifically for RF and high-fidelity analog circuits - prioritizing noise suppression, capacitor minimization, and thermal robustness in portable wireless systems.

FAQ

What is the minimum input voltage required for LP5900TLX-2.75/NOPB to regulate 2.75 V output?

The LP5900TLX-2.75/NOPB requires a minimum input voltage of 2.5 V to begin regulation, but stable 2.75 V output demands VIN ≥ VOUT + VDO. With 80 mV typical dropout, LP5900TLX-2.75/NOPB delivers regulated 2.75 V output down to 2.83 V input at 150 mA. Below that, output drops linearly per dropout characteristics.

Does LP5900TLX-2.75/NOPB require an external noise-bypass capacitor?

No - LP5900TLX-2.75/NOPB is explicitly designed to operate without an external noise-bypass capacitor. Its internal bandgap reference includes an integrated RC filter that reduces reference noise before amplification, enabling 6.5 μV_RMS output noise with only 0.47-μF input and output ceramic capacitors.

What package type is used by LP5900TLX-2.75/NOPB, and what are its mounting requirements?

LP5900TLX-2.75/NOPB uses the DSBGA-4 (YZR) package: 1.108 mm × 1.083 mm body with bottom thermal pad. Mounting requires adherence to TI's AN-1112 guidelines - including precise stencil aperture, controlled reflow profile, and connection of the thermal pad to PCB ground plane using ≥4 thermal vias for reliable thermal performance.

How does the enable pin (EN) function on LP5900TLX-2.75/NOPB?

The EN pin on LP5900TLX-2.75/NOPB has an internal 1-MΩ pull-down resistor to GND. Applying ≥1.2 V enables regulation; ≤0.4 V disables output and reduces quiescent current to <1 µA. The pin draws only 5.5 µA at 5.5 V, allowing direct interfacing with standard GPIOs without external buffering.

Can LP5900TLX-2.75/NOPB be used with tantalum output capacitors?

While LP5900TLX-2.75/NOPB is optimized for 0.47–10 μF ceramic capacitors (X7R/X5R), tantalum capacitors may be used if ESR falls within 5–500 mΩ and surge current rating is verified for the application. However, ceramics are strongly preferred due to lower ESR, smaller size, better temperature stability, and absence of catastrophic failure modes under surge conditions.