Texas Instruments LP5900TLX-2.3/NOPB

Overview

LP5900TLX-2.3/NOPB from Texas Instruments is a 150-mA ultra-low-noise LDO regulator designed for RF and analog circuits, delivering 2.3 V output with ±2% tolerance, 80 mV typical dropout, 6.5 μV_RMS output noise, and 75 dB PSRR at 1 kHz. 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.

For engineers reviewing the LP5900TLX-2.3/NOPB datasheet, LP5900TLX-2.3/NOPB pinout, LP5900TLX-2.3/NOPB application, or LP5900TLX-2.3/NOPB equivalent, key selection criteria include low-noise power delivery for sensitive RF stages, minimal external component count in space-constrained portable designs, and logic-controlled enable functionality with sub-1-μA shutdown current.

Technical Context

The LP5900TLX-2.3/NOPB uses an innovative internal RC-filtered reference architecture to suppress internal noise before reaching the output buffer, eliminating the need for an external noise-bypass capacitor. Its enable control features a 1-MΩ internal pull-down resistor and defined VIH/VIL thresholds (1.2 V / 0.4 V) for reliable logic-level interfacing.

Stability is achieved with 0.47-μF ceramic capacitors on both input and output, supported by ESR tolerance of 5–500 mΩ. Thermal protection activates at ~160°C junction temperature with ~20°C hysteresis, and the device remains regulated down to zero load current.

Key Specifications

Pinout & Package

LP5900TLX-2.3/NOPB is packaged in a 4-pin DSBGA (YZR) with 1.108 mm × 1.083 mm body size and an exposed thermal pad on the bottom. The package requires soldering the thermal pad to PCB ground or leaving it floating; connection to any other potential is prohibited.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL720F12-DBVR and MCP1700T-2302E/TT, LP5900TLX-2.3/NOPB uniquely delivers 2.3 V output with RF-grade noise performance (6.5 μV_RMS) and integrated enable control in a 1.1 mm × 1.1 mm footprint-making it the only option qualified for noise-critical 2.3 V analog/RF bias rails in portable devices.

Availability

LP5900TLX-2.3/NOPB is available at Aetrix Electronics and suitable for cellular front-end modules, wireless LAN transceivers, portable audio codecs, and low-power sensor signal chains requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LP5900TLX-2.3/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.

The LP5900 product line was developed specifically to address ultra-low-noise power requirements of RF transceivers, cellular baseband processors, and high-fidelity analog signal chains in space-constrained portable electronics.

FAQ

What is the minimum input voltage required for LP5900TLX-2.3/NOPB to regulate 2.3 V output?

The LP5900TLX-2.3/NOPB requires a minimum input voltage of 2.5 V to operate, and to maintain regulation at full load, VIN must exceed VOUT + VDO. With 80 mV typical dropout, LP5900TLX-2.3/NOPB delivers stable 2.3 V output when input is ≥2.38 V. However, TI specifies 2.5 V as the absolute minimum recommended operating input to ensure functional integrity across temperature and process variation.

Does LP5900TLX-2.3/NOPB require an external noise-bypass capacitor?

No, LP5900TLX-2.3/NOPB does not require an external noise-bypass capacitor. Its internal reference stage incorporates a first-order RC filter that suppresses reference noise before it reaches the output buffer. This architecture enables 6.5 μV_RMS output noise performance using only 0.47-μF input and output ceramic capacitors-reducing component count and PCB area versus traditional LDOs.

What is the function of the thermal pad on the LP5900TLX-2.3/NOPB DSBGA package?

The exposed thermal pad on the LP5900TLX-2.3/NOPB DSBGA package serves as the primary heat conduction path from the silicon die to the PCB. TI recommends connecting it to a ground plane via ≥4 thermal vias to achieve optimal thermal resistance (R_θJB = 35.6°C/W). It may be left floating but must never be connected to any voltage other than the same ground potential present at pin 3 (GND).

Can LP5900TLX-2.3/NOPB operate with no load connected to the output?

Yes, LP5900TLX-2.3/NOPB remains stable and maintains regulation with zero load current. Its internal compensation and no-load stability design ensure the 2.3 V output remains within ±2% tolerance even when disconnected from downstream circuitry-enabling use in standby-biased RF amplifier stages or reference voltage nodes that draw negligible current.

What are the enable pin voltage thresholds for LP5900TLX-2.3/NOPB?

The LP5900TLX-2.3/NOPB enable pin has a guaranteed VIH threshold of ≥1.2 V to ensure full turn-on and a VIL threshold of ≤0.4 V to guarantee complete shutdown. An internal 1-MΩ pull-down resistor holds the EN pin low when unconnected, making the device default-off. These thresholds are compatible with 1.8 V and 3.3 V logic families without external level-shifting components.