Texas Instruments LP2951-50DRG4

Overview

LP2951-50DRG4 from Texas Instruments is a 5.0V fixed-output, low-dropout linear regulator in an 8-pin WSON package, delivering up to 100mA output current with ±1% accuracy over line, load, and temperature. It operates from 2V to 30V input, features 340mV typical dropout at 100mA, and integrates shutdown control and active-low error flag for power sequencing in industrial motor drives.

For engineers reviewing the LP2951-50DRG4 datasheet, LP2951-50DRG4 pinout, LP2951-50DRG4 application, or LP2951-50DRG4 equivalent, key selection criteria include its 5.0V fixed output, 340mV dropout at full load, 50μA quiescent current, thermal shutdown, and compatibility with 1–100μF ceramic output capacitors without ESR constraints.

Technical Context

The LP2951-50DRG4 implements a bandgap-referenced error amplifier with internal 1.20V reference (±0.012V over –40°C to 125°C), enabling precise 5.0V regulation via factory-trimmed resistor divider. Its ERROR comparator monitors feedback voltage with 6% nominal output drop detection threshold and open-drain output.

Shutdown is active-high with 2.0V logic threshold and sub-1μA shutdown current; the device supports stable operation with output capacitors as low as 1μF and ESR up to 2Ω-eliminating need for tantalum or aluminum electrolytics in space-constrained designs.

Key Specifications

Pinout & Package

LP2951-50DRG4 uses an 8-pin WSON (DRG) package, 3.00mm × 3.00mm, with exposed thermal pad for enhanced power dissipation. Pin 1 is INPUT; Pin 2 is SENSE; Pin 3 is SHUTDOWN; Pin 4 is GND; Pin 5 is ERROR; Pin 6 is VTAP; Pin 7 is FEEDBACK; Pin 8 is OUTPUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP2951-50D and TLV70750, LP2951-50DRG4 uniquely balances ultra-small WSON packaging, integrated power management features (SHUTDOWN + ERROR), and industrial-grade thermal robustness-making it optimal for space-constrained, fault-aware embedded controllers.

Availability

LP2951-50DRG4 is available at Aetrix Electronics and suitable for industrial motor drives, factory automation I/O modules, grid infrastructure monitoring terminals, and building automation controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LP2951-50DRG4 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 leader specializing in analog, embedded processing, and power management technologies with decades of industrial-grade reliability validation.

The LP295x family was designed specifically for wide-input, low-dropout regulation in harsh industrial environments-emphasizing fault resilience, wide temperature operation, and compatibility with modern ceramic capacitors.

FAQ

What is the output voltage tolerance of the LP2951-50DRG4 over temperature?

The LP2951-50DRG4 delivers 5.0V output with ±1% accuracy over the full –40°C to 125°C junction temperature range. This specification applies to the "new chip" revision confirmed in TI's SLVS582L datasheet Rev. JUNE 2026, and is measured at 100µA to 100mA load current with VIN = VOUT(nom) + 1V. The LP2951-50DRG4 achieves this via factory-trimmed internal resistor dividers and a low-drift 1.20V bandgap reference.

Does the LP2951-50DRG4 require an external capacitor on the FEEDBACK pin?

No, the LP2951-50DRG4 does not require an external capacitor on the FEEDBACK pin for fixed 5.0V operation. In this configuration, FEEDBACK is internally connected to VTAP and OUTPUT is tied to SENSE, eliminating external components. A feed-forward capacitor (CFF) is only needed for adjustable versions when feedback divider current falls below 12µA-irrelevant to the LP2951-50DRG4's fixed-output architecture.

What is the minimum input voltage required for the LP2951-50DRG4 to regulate 5.0V at 100mA?

The LP2951-50DRG4 requires a minimum input voltage of 5.34V to maintain 5.0V regulation at 100mA load, based on its 340mV typical dropout voltage. At –40°C to 125°C, maximum dropout rises to 570mV, so design margin requires VIN ≥ 5.57V for guaranteed regulation across temperature. The device also features UVLO with 1.9V typical turn-on threshold to prevent erratic behavior during brownout conditions.

Can the ERROR pin of the LP2951-50DRG4 drive an LED directly?

Yes, the ERROR pin of the LP2951-50DRG4 can drive a standard 2mA LED directly when pulled up to 5V via a 2.2kΩ resistor. As an active-low open-drain output, it sinks up to 400µA at 250mV VOL (25°C), well within typical LED forward current requirements. For higher-current indicators, a small NPN transistor buffer is recommended-but no external level-shifting or voltage translation is needed for 3.3V or 5V logic domains.

Is the LP2951-50DRG4 RoHS-compliant and halogen-free?

Yes, the LP2951-50DRG4 is RoHS-compliant and halogen-free per Texas Instruments' official product change notification (PCN) and material declarations. It meets JEDEC J-STD-609 Category 1 for bromine and chlorine content (<900 ppm) and carries the "Green" designation in TI's packaging documentation. Full compliance data is available in TI's Q100 qualification report and IPC-1752-compliant material disclosure files.