HLF UC3844 / UC2844 – Current-Mode PWM Controller (SOP8) Input Voltage: 16V – 30V | Operating Temperature: 0°C to +70°C (UC3844), –40°C to +85°C (UC2844) | Surface-Mount Package

The HLF UC3844 / UC2844 (SOP8) is a compact current-mode PWM controller offering high reliability and efficient performance for DC-DC converters and SMPS applications. Featuring a fixed 50% maximum duty cycle, it provides precise control, stable operation, and fast transient response. The integrated 5V reference and high-speed output driver enable seamless MOSFET interfacing in compact designs.

Key Features:

• Function: Current-Mode PWM Controller

• Input Voltage Range: 16V – 30V

• Operating Temperature:

  • UC3844: 0°C to +70°C

  • UC2844: –40°C to +85°C

• Package Type: SOP8 (Small Outline Package)

• Mounting Type: Surface-Mount

• Precision 5V Reference (±1%)

• Low Start-Up Current (0.17 mA typical)

• 50% Maximum Duty Cycle Limit

• Under-Voltage Lockout (UVLO)

• High-Speed Totem-Pole Output

• Fixed Frequency (~100 kHz)

• Excellent Dynamic and Load Response

Applications:

• Compact DC-DC Converters

• Off-Line Power Supplies

• LED Drivers and Battery Chargers

• Industrial Control Power Systems

• Consumer Electronics