Texas Instruments LP5900TL-2.3/NOPB

Overview

LP5900TL-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, and 6.5 μV_RMS output noise - enabling clean power in cellular phone RF front-ends and wireless LAN baseband ICs.

For engineers reviewing the LP5900TL-2.3/NOPB datasheet, LP5900TL-2.3/NOPB pinout, LP5900TL-2.3/NOPB application, or LP5900TL-2.3/NOPB equivalent, key selection criteria include low-noise operation without bypass capacitors, stable performance with 0.47-μF ceramic input/output caps, logic-controlled enable functionality, thermal protection, and operation across −40°C to 125°C junction temperature.

Technical Context

The LP5900TL-2.3/NOPB uses an innovative internal RC-filtered reference architecture to suppress reference noise before reaching the output buffer, eliminating need for external noise-bypass capacitors. Its enable circuit integrates a 1-MΩ pull-down resistor and defined VIH/VIL thresholds (1.2 V / 0.4 V) for robust logic control.

It achieves high PSRR (75 dB at 1 kHz) and low line/load transient response via optimized pass transistor design and compensation tailored for 0.47-μF ceramic capacitors. Thermal shutdown activates at ~160°C with 20°C hysteresis, and dropout voltage remains stable across load and temperature (80 mV typ., 150 mV max at 150 mA).

Key Specifications

Pinout & Package

The LP5900TL-2.3/NOPB is packaged in a 6-pin WSON (NGF) package with exposed thermal pad (2.50 mm × 2.20 mm nominal body size), optimized for thermal performance in space-constrained RF modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LPGEDR and MCP1703T-2302E/MB, the LP5900TL-2.3/NOPB uniquely balances ultra-low noise (6.5 μV_RMS), high PSRR (75 dB), and minimal external components - making it optimal for RF-critical single-rail designs where signal integrity outweighs multi-channel integration or lowest-quiescent-current trade-offs.

Availability

LP5900TL-2.3/NOPB is available at Aetrix Electronics and suitable for cellular phones, wireless LAN devices, and PDA handsets requiring stable component supply, consistent parametric performance, and long-term production availability.

Supply support for LP5900TL-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 specializing in analog, embedded processing, and connectivity technologies, with leadership in power management innovation.

The LP5900 product line was engineered specifically for RF and analog circuitry in portable electronics, prioritizing noise performance, capacitor minimization, and thermal resilience over raw current capacity or feature integration.

FAQ

What is the minimum input voltage required for stable operation of the LP5900TL-2.3/NOPB?

The LP5900TL-2.3/NOPB requires a minimum input voltage of 2.5 V to ensure full internal circuit functionality. For regulated 2.3 V output, the input must exceed V_OUT + V_DO, i.e., ≥2.38 V (2.3 V + 80 mV typ.). The recommended operating range is 2.5 V to 5.5 V, and TI specifies that VIN must be at least V_OUT + 1 V for optimal regulation margin in noisy environments.

Does the LP5900TL-2.3/NOPB require an external noise-bypass capacitor?

No, the LP5900TL-2.3/NOPB does not require an external noise-bypass capacitor. Its internal design incorporates a first-order RC filter on the reference voltage path, reducing reference noise before it reaches the output stage. This enables 6.5 μV_RMS output noise performance with only 0.47-μF input and output ceramic capacitors - a key differentiator versus conventional LDOs.

What is the thermal pad connection requirement for the LP5900TL-2.3/NOPB WSON package?

The exposed thermal pad on the LP5900TL-2.3/NOPB WSON (NGF) package must be soldered to a PCB copper area tied to ground potential. TI recommends using at least four thermal vias under the pad to conduct heat into inner ground planes. Connecting the pad to any potential other than the same ground seen at Pin 3 (GND) may compromise thermal performance and reliability.

How does the enable pin (EN) of the LP5900TL-2.3/NOPB behave when left unconnected?

When the EN pin of the LP5900TL-2.3/NOPB is left unconnected, its internal 1-MΩ pull-down resistor pulls it to GND, ensuring the device remains in shutdown mode with <1 μA quiescent current. To activate regulation, EN must be driven to ≥1.2 V; to guarantee disable, it must be held ≤0.4 V. No external pull-down is needed unless system-level noise immunity requires stronger grounding.

Can the LP5900TL-2.3/NOPB operate without any load connected to the output?

Yes, the LP5900TL-2.3/NOPB remains stable and maintains regulation with zero load current. Its compensation network is designed for no-load stability, and the datasheet explicitly states it maintains a stable, regulated output voltage without a load. Ground current under no-load conditions is 30 μA (typ.) at 2.5 V output, confirming functional readiness even in standby states.