Texas Instruments LP3995ITL-1.9/NOPB

Overview

LP3995ITL-1.9/NOPB from Texas Instruments is a micropower 150-mA CMOS low-dropout linear voltage regulator with fixed 1.9-V output, 60-mV typical dropout at full load, ±75-mV output voltage tolerance, and active shutdown enabling <3-nA quiescent current. It powers RF/analog circuitry in space-constrained portable devices requiring ultra-low noise and fast enable control.

For engineers reviewing the LP3995ITL-1.9/NOPB datasheet, LP3995ITL-1.9/NOPB pinout, LP3995ITL-1.9/NOPB application, or LP3995ITL-1.9/NOPB equivalent, key selection criteria include its 1.9-V fixed output, DSBGA-5 package footprint (1.502 mm × 1.045 mm), 25-µV_RMS output noise, 30-µs turnon time, and compatibility with 1-µF ceramic output capacitors.

Technical Context

The LP3995ITL-1.9/NOPB implements a CMOS-based LDO architecture with integrated bandgap reference, error amplifier, and pass transistor. Its BYPASS pin connects directly to the high-impedance node of the reference circuit, enabling external 10-nF capacitor placement to suppress output noise without degrading transient response.

Enable logic operates with VIH ≥ 0.9 V and VIL ≤ 0.4 V, triggering internal active discharge of the output during turnoff (175-µs typical). Thermal shutdown activates at ~160°C junction temperature with ~20°C hysteresis, and short-circuit protection limits output current to 450 mA.

Key Specifications

Pinout & Package

LP3995ITL-1.9/NOPB uses the YZR (DSBGA-5) package: 1.502 mm × 1.045 mm body, 0.5-mm pitch, bottom-exposed die pad (GND-connected). Pin 5 is N/C (no internal connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL720F19-DBVR and MCP1700T-1902E/TT, LP3995ITL-1.9/NOPB uniquely combines sub-3-nA shutdown, 25-µV_RMS noise via BYPASS pin, and 175-µs active turnoff - making it optimal for RF/analog subsystems demanding simultaneous low noise, fast sequencing, and minimal leakage.

Availability

LP3995ITL-1.9/NOPB is available at Aetrix Electronics and suitable for GSM handsets, Bluetooth audio devices, portable information appliances, and wideband CDMA terminals requiring stable component supply across extended production lifecycles.

Supply support for LP3995ITL-1.9/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 designing analog ICs, embedded processors, and system solutions for industrial, automotive, and personal electronics markets.

The LP3995ITL-1.9/NOPB belongs to TI's micropower LDO family targeting portable battery-powered systems - engineered for ultra-low noise, fast enable/disable, and minimal board area using DSBGA packaging.

FAQ

What is the maximum input voltage rating for LP3995ITL-1.9/NOPB?

The absolute maximum input voltage for LP3995ITL-1.9/NOPB is 6.5 V. However, the recommended operating range is 2.5 V to 6 V per the datasheet. Exceeding 6.5 V risks permanent damage. The device achieves optimal dropout and regulation performance within the 2.5–6 V window, especially critical when powering from single-cell Li-ion (3.0–4.2 V) or two-cell alkaline (2.4–3.2 V) sources.

Does LP3995ITL-1.9/NOPB require an external bypass capacitor, and what value is recommended?

Yes, LP3995ITL-1.9/NOPB requires a 10-nF ceramic capacitor between the BYPASS pin and GND to minimize output noise and prevent startup overshoot. This capacitor connects directly to the bandgap reference node; using NPO/COG dielectric ensures low leakage and stable accuracy. Omitting it increases output noise to ~55 µV_RMS, degrading performance in RF/analog applications.

Can LP3995ITL-1.9/NOPB operate without any load connected to the OUT pin?

Yes, LP3995ITL-1.9/NOPB remains stable and in regulation with zero load - a key feature confirmed in Section 9.2.2.4 of the datasheet. This makes it suitable for applications like CMOS RAM keep-alive circuits or real-time clock backup supplies where continuous regulation is required even during deep sleep states.

What is the thermal shutdown behavior of LP3995ITL-1.9/NOPB?

LP3995ITL-1.9/NOPB activates thermal shutdown at approximately 160°C junction temperature and auto-restarts when the junction cools to ~140°C. This hysteresis prevents oscillation during overload. The shutdown circuit protects against temporary thermal overload but is not a substitute for proper PCB thermal design - the DSBGA package requires GND-connected thermal pad and vias for sustained 150-mA operation.

Is LP3995ITL-1.9/NOPB compatible with ceramic output capacitors smaller than 1 µF?

No - the datasheet explicitly specifies a minimum 1-µF ceramic output capacitor (X7R/Y5V/Z5U, ESR 5–500 mΩ) for stability. Using smaller values risks oscillation or poor transient response. The 1-µF requirement is validated across temperature and load conditions; reducing capacitance below this threshold invalidates the guaranteed PSRR, noise, and regulation specs for LP3995ITL-1.9/NOPB.