LM2941T

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LM2941T - 1A Low Dropout Voltage Regulator

Overview

The LM2941T is a positive voltage regulator capable of delivering up to 1A of output current with exceptional dropout voltage characteristics. Designed for demanding applications, this regulator features a typical dropout voltage of just 0.5V (1V maximum across the full temperature range). The device incorporates intelligent quiescent current reduction that significantly improves efficiency when the input-output differential exceeds 3V. With built-in protection against automotive electrical hazards and robust transient response, the LM2941T is particularly well-suited for vehicular and industrial applications where reliability is critical.

Key Features

• 1A guaranteed output current capability
• Low dropout voltage: 0.5V typical (1V max)
• Intelligent quiescent current reduction:
  • 30mA typical at 5V input-output differential
  • Automatically adjusts based on voltage differential
• Comprehensive protection features:
  • Reverse battery protection
  • Load dump transient protection (up to 60V)
  • Two-battery jump start protection
  • Automatic shutdown during overvoltage events
  • Internal current limiting
  • Thermal shutdown
• Output voltage tolerance: ±2% over line and load conditions
• Available in fixed output voltages: 5V, 8V, 10V, 12V, 15V
• Adjustable output version (LM2941) available
• TO-220 package for excellent thermal performance

Applications

The LM2941T's robust design and protection features make it ideal for:

• Automotive electronics:
  • ECU power supplies
  • Infotainment systems
  • Instrument clusters
  • Body control modules
• Industrial control systems
• Battery-powered equipment
• Embedded systems requiring stable power
• Aftermarket automotive accessories
• Portable test equipment

Electrical Characteristics

(TA = 25°C, VIN = VOUT(nom) + 5V, IOUT = 500mA, unless otherwise specified)

Absolute Maximum Ratings

• Input Voltage: -50V to +26V
• Load Dump Voltage: 60V (transient)
• Power Dissipation: Internally limited
• Operating Junction Temperature: -40°C to +125°C
• Storage Temperature: -65°C to +150°C

Key Performance Parameters

• Output Voltage Accuracy: ±2% (over line, load, and temperature)
• Dropout Voltage: 0.5V typical (1V max at 1A, full temp range)
• Quiescent Current:
  • 30mA typical (VIN-VOUT ≥ 5V)
  • 10mA typical (VIN-VOUT ≥ 10V)
• Ripple Rejection: 60dB typical (120Hz)
• Output Noise Voltage: 100μV typical (10Hz to 100kHz)
• Load Regulation: 0.05% typical (0mA to 1A)
• Line Regulation: 0.01%/V typical
• Current Limit Threshold: 1.5A typical

Package Information

The LM2941T is available in a TO-220 package with the following mechanical characteristics:

TO-220 Package Dimensions

• Package Type: Through-hole, 3-pin
• Lead Material: Copper alloy
• Lead Finish: Matte tin
• Package Weight: 2.0g typical
• Mounting Style: Through-hole or heatsink mounting
• Thermal Resistance, Junction-to-Air: 50°C/W (no heatsink)
• Thermal Resistance, Junction-to-Case: 3°C/W

Pin Configuration

• Pin 1: Input Voltage (VIN)
• Pin 2: Ground (GND)
• Pin 3: Output Voltage (VOUT)

Design Considerations

For optimal performance with the LM2941T:

• Input Capacitor:
  • 10μF minimum (tantalum or aluminum electrolytic)
  • Required for stability and transient response
  • Place as close as possible to the regulator
• Output Capacitor:
  • 22μF minimum recommended
  • Low ESR type preferred (tantalum or specialty polymer)
  • Required for stability and load transient response
• Thermal Management:
  • Calculate maximum power dissipation: PD = (VIN - VOUT) × IOUT
  • Use heatsink when power dissipation exceeds 2W
  • Ensure adequate airflow in enclosed designs
• PCB Layout:
  • Minimize trace lengths to input/output capacitors
  • Use wide traces for high current paths
  • Consider separate ground paths for power and signal

Reliability and Compliance

• Qualified for automotive applications
• ESD protection: 2kV HBM
• Manufactured under TS16949 quality system
• RoHS compliant
• Pb-free package available

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