MCP1664
High-Voltage Step-Up LED Driver with UVLO and Open Load Protection
Features General Description The MCP1664 is a compact, space-efficient,
fixed-frequency, non-synchronous step-up converter
optimized to drive multiple strings of LEDs with
constant current powered from two and three-cell
alkaline or NiMH/NiCd as well as from one-cell Li-Ion or
Li-Polymer batteries. 36V, 400 mпЃ— Integrated Switch
Up to 92% Efficiency
Drive LED Strings in Constant Current
1.8A Peak Input Current Limit:
-ILED up to 200 mA at 3.3V VIN, 4 White LEDs
-ILED up to 300 mA at 5.0V VIN, 4 White LEDs
-ILED up to 150 mA at 4.2V VIN, 8 White LEDs
Input Voltage Range: 2.4V to 5.5V
Undervoltage Lockout (UVLO):
-UVLO at VIN Rising: 2.3V, typical
-UVLO at VIN Falling: 1.85V, typical
Shutdown Current (EN = GND): 40 nA Typical
PWM Operation: 500 kHz Switching Frequency
Cycle-by-Cycle Current Limiting
Internal Compensation
Open Load Protection (OLP) in the event of: …