HLF UC3845 / UC2845 – Current-Mode PWM Controller (SOP8) Input Voltage: 8.4V – 30V | Operating Temperature: 0°C to +70°C (UC3845), –40°C to +85°C (UC2845) | Surface-Mount Package

The HLF UC3845 / UC2845 (SOP8) is a compact, surface-mount current-mode PWM controller featuring a low start-up voltage (8.4V) and 50% maximum duty cycle, optimized for efficient power management in compact SMPS and DC-DC converter designs. With a precision 5V reference, low start-up current, and totem-pole MOSFET driver, it delivers excellent regulation and fast transient performance.

Key Features:

• Function: Current-Mode PWM Controller

• Input Voltage Range: 8.4V – 30V

• Operating Temperature:

  • UC3845: 0°C to +70°C

  • UC2845: –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)

• Fixed Frequency (~100 kHz)

• High-Speed MOSFET Drive Capability

• Excellent Dynamic and Load Response

Applications:

• Compact DC-DC Power Converters

• Off-Line SMPS Controllers

• LED Drivers

• Battery Chargers

• Consumer and Industrial Power Supplies