Adding Intelligence to Lighting Applications
Driving LEDs with a Charge Pump
Contrary to other topologies, a charge pump based LED driver does not require the use of inductors. This provides a more compact and less expensive circuit. The downside is that charge pumps cannot supply large amounts of current compared to the other topologies. Charge pump circuits are most useful for backlighting applications.
Common applications include:
- Small LCD displays backlighting
- Automotive instrumentation backlighting.
- Digital cameras’ LED flash
MCP1252 Charge Pump Backlight Demonstration Board
Charge Pump LED Driver Using the MCP1252