MCP1662
High-Voltage Step-Up LED Driver with UVLO and Open Load Protection
Features General Description The MCP1662 device is a compact, space-efficient,
fixed-frequency, non-synchronous step-up converter
optimized to drive LED strings with constant current
from a two-or three-cell alkaline or lithium EnergizerВ®,
or NiMH/NiCd, or one-cell Lithium-Ion or Li-Polymer
batteries. 36V, 800 mпЃ— Integrated Switch
Up to 92% Efficiency
Drive LED Strings in Constant Current
1.3A Peak Input Current Limit:
-ILED up to 200 mA @ 5.0V VIN, 4 White LEDs
-ILED up to 125 mA @ 3.3V VIN, 4 White LEDs
-ILED up to 100 mA @ 4.2V VIN, 8 White LEDs
Input Voltage Range: 2.4V to 5.5V
Feedback Voltage Reference: VFB = 300 mV
Undervoltage Lockout (UVLO):
-UVLO @ VIN Rising: 2.3V, typical
-UVLO @ VIN Falling: 1.85V, typical
Sleep Mode with 20 nA Typical Quiescent Current
PWM Operation: 500 kHz Switching Frequency
Cycle-by-Cycle Current Limiting
Internal Compensation …