Texas Instruments LP2966IMMX-1833/NOPB

Overview

LP2966IMMX-1833/NOPB from Texas Instruments (formerly National Semiconductor) is a dual-channel ultra-low-dropout linear regulator IC delivering 150mA per output with fixed 1.8V and 3.3V outputs in an MSOP-8 package. It operates from 2.7V to 7.0V input, achieves 135mV dropout at 150mA load, maintains ±1% output voltage accuracy over temperature, and features independent active-low shutdown pins - ideal for powering core and I/O rails in portable GPS receivers and USB-powered instrumentation.

For engineers reviewing the LP2966IMMX-1833/NOPB datasheet, LP2966IMMX-1833/NOPB pinout, LP2966IMMX-1833/NOPB application, or LP2966IMMX-1833/NOPB equivalent, key selection criteria include dual-rail sequencing capability, low-noise operation (150µV_rms), error flag monitoring for both outputs, and compatibility with 1µF ceramic output capacitors without stability compromise.

Technical Context

The LP2966IMMX-1833/NOPB integrates two independent PMOS-based LDO regulators sharing a common input and ground, each with dedicated shutdown and open-drain error flag outputs. Its architecture enables cross-regulation <0.0004 mV/mA and PSRR of 60dB at 120Hz under nominal conditions.

Each regulator uses a precision bandgap reference and low-ESR capacitor-stabilized feedback loop, supporting operation down to 1µF output capacitance while maintaining stability across −40°C to +125°C junction temperature. The device incorporates thermal shutdown (165°C threshold), short-circuit foldback protection (600mA knee), and reverse-current blocking via internal parasitic diode management.

Key Specifications

Pinout & Package

LP2966IMMX-1833/NOPB is housed in an MSOP-8 surface-mount package (3.0mm × 3.0mm × 1.0mm height, NS package code MUA08A), optimized for space-constrained portable designs and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP2966IMMX-1833/NOPB, TPS7A202533PDBVR offers higher output current and better PSRR but demands layout changes, while no verified pin-compatible dual-LDO alternative matches its MSOP-8 size, 1µF capacitor support, and integrated error flags - making LP2966IMMX-1833/NOPB uniquely suited for space- and cost-sensitive dual-rail portable designs.

Availability

LP2966IMMX-1833/NOPB is available at Aetrix Electronics and suitable for GPS receiver modules, USB-powered test equipment, and industrial handheld terminals requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LP2966IMMX-1833/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 acquired National Semiconductor in 2011 and maintains full technical and supply chain continuity for legacy power management products including the LP2966 series.

The LP2966 product line was designed specifically for battery-powered portable electronics requiring dual, independently controlled, ultra-low-noise LDOs in minimal footprint - addressing needs in wireless infrastructure, handheld computing, and precision instrumentation.

FAQ

What are the exact output voltages of LP2966IMMX-1833/NOPB?

LP2966IMMX-1833/NOPB provides fixed 1.8V on VOUT1 and 3.3V on VOUT2, as indicated by the "1833" suffix in the part number. These values are factory-trimmed and guaranteed to ±1% at room temperature and ±3.5% across the full −40°C to +125°C junction temperature range, per the Electrical Characteristics table in the official datasheet.

Can LP2966IMMX-1833/NOPB operate from a single-cell Li-ion battery?

Yes, LP2966IMMX-1833/NOPB supports input voltages from 2.7V to 7.0V, fully covering the discharge curve of a standard 3.7V Li-ion cell (3.0V–4.2V). With 135mV dropout at 150mA, it regulates 3.3V down to 3.43V input and 1.8V down to 2.93V input - enabling >95% depth-of-discharge utilization before brownout.

How do the ERROR1 and ERROR2 pins function in LP2966IMMX-1833/NOPB?

ERROR1 and ERROR2 are open-drain outputs that go low when their respective output drops >10% below nominal (e.g., <1.62V for VOUT1, <2.97V for VOUT2), indicating undervoltage due to input collapse, overload, or thermal shutdown. Each requires an external pull-up resistor (100kΩ–1MΩ); they are forced invalid when corresponding SD pins are asserted low to conserve power.

What output capacitor is required for stable operation of LP2966IMMX-1833/NOPB?

LP2966IMMX-1833/NOPB requires a minimum 1µF ceramic capacitor (X7R or better) on each output, placed within 5mm of the VOUT pin and GND. Larger values improve transient response and noise suppression. The device is explicitly characterized and stable with low-ESR ceramics - no tantalum or electrolytic capacitors are needed, simplifying BOM and layout.

Does LP2966IMMX-1833/NOPB include thermal protection?

Yes, LP2966IMMX-1833/NOPB incorporates internal thermal shutdown with a 165°C trip threshold and 25°C hysteresis. When junction temperature exceeds 165°C, both outputs disable and remain off until temperature falls below 140°C. This protection operates independently of shutdown pin states and is documented in the Absolute Maximum Ratings and Electrical Characteristics sections of the datasheet.