Freescale Semiconductor is a global leader in the design and manufacture of embedded semiconductors for the automotive, consumer, industrial, networking and wireless markets. The company is based in Austin, Texas, and has design, research and development, manufacturing or sales operations in more than 30 countries.
The MC34845 is a 6-channel light emitting diode (LED) driver with integrated boost converter for use in liquid crystal display (LCD) backlights. Capable of driving up to 96 LEDs, the MC34845 is suitable for notebook displays from 10- to 17-inch and larger, as well as general applications with screens of seven inches or larger requiring up to 10W LED backlight power.
Features:
- Input voltage of 5.0V to 21V
- Output voltage up to 60V
- Dynamic headroom control (DHC)
- 2.0A integrated boost FET
- Boost switching frequency
- 600 KHz (MC34845)
- 1.2 MHz (MC34845A)
- 90 percent efficiency (DC:DC)
- 6-channel current mirror with ±2 percent
- Up to 30 mA LED current per channel
- Direct PWM input control
- PWM frequency up to 100 kHz
- 50,000:1 dimming resolution
- 200 ns minimum pulse
- User-programmable OVP
- LED short/open protection
- Over-temperature/over-current protection
- Under-voltage lockout
- 24-pin 4 mm x 4 mm x 0.65 mm TQFN package
Applications:
- PC notebooks
- Netbooks
- GPS screens
- Portable DVDs
- Picture frames
- Smaller screen televisions
- Gaming consoles
- Industrial/instrumentation displays
- Health care device displays