MCP1662
MCP1662 is High-Voltage Step-Up LED Driver manufactured by Microchip Technology.
Features
- 36V, 800 m Integrated Switch
- Up to 92% Efficiency
- Drive LED Strings in Constant Current
- 1.3A Peak Input Current Limit:
- ILED up to 200 m A @ 5.0V VIN, 4 White LEDs
- ILED up to 125 m A @ 3.3V VIN, 4 White LEDs
- ILED up to 100 m A @ 4.2V VIN, 8 White LEDs
- Input Voltage Range: 2.4V to 5.5V
- Feedback Voltage Reference: VFB = 300 m V
- Undervoltage Lockout (UVLO):
- UVLO @ VIN Rising: 2.3V, typical
- UVLO @ VIN Falling: 1.85V, typical
- Sleep Mode with 20 n A Typical Quiescent Current
- PWM Operation: 500 k Hz Switching Frequency
- Cycle-by-Cycle Current Limiting
- Internal pensation
- Open Load Protection (OLP) in the Event of:
- Feedback pin shorted to GND (prevent excessive current into LEDs)
- Disconnected LED string (prevent overvoltage to the converter’s Output and SW pin)
- Overtemperature Protection
- Available Packages:
- 5-Lead SOT-23
- 8-Lead 2x3 TDFN
Applications
- Two and Three-Cell Alkaline or Ni MH/Ni Cd White LED Driver for Backlighting Products
- Li-Ion Battery LED Lighting Application
- Camera Flash
- LED Flashlights and Backlight Current Source
- Medical Equipment
- Portable Devices:
- Handheld Gaming Devices
- GPS Navigation Systems
- LCD Monitors
- Portable DVD Players
General Description
The MCP1662 device is a pact, 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 Energizer®, or Ni MH/Ni Cd, or one-cell Lithium-Ion or Li-Polymer batteries.
The device integrates a 36V, 800 m low-side switch, which is protected by the 1.3A cycle-by-cycle inductor peak current limit operation. All pensation and protection circuitry is integrated to minimize the number of external ponents.
The internal feedback (VFB) voltage is set to 300 m V for low power dissipation when sensing and regulating the LED current. A single resistor sets the LED current.
The device features an Undervoltage Lockout (UVLO) that avoids start-up with low inputs...
