MC34845: 6 Channel LED Backlight Driver with Power Supply

Overview

The NXP^® MC34845 is a high efficiency, LED driver for use in backlighting LCD displays from 10” to 17”+.

Capable of driving up to 16 LEDs in series in each of 6 strings
PWM dimming is performed by applying a PWM input signal to the PWM pin which modulates the LED channels directly
The integrated boost converter uses dynamic headroom control to automatically set the output voltage
Three device versions for boost frequency: the 34845 and 34845C are 600 kHz, the 34845A is 1.2 MHz and the 34845B and 34845D are 300 kHz
Includes fault protection modes for LED short and open, over temperature, over current and over voltage errors. The OVP level can be set by using an external resistor divider.

Input voltage of 5.0 to 21 V
Boost output voltage up to 60 V
2.0 A integrated boost FET
Fixed boost frequency to 300kHz, 600 kHz or 1.2 MHz
OTP, OCP, UVLO fault detection, LED short/open protection
Programmable LED current between 3.0 mA and 30 mA
24-Ld 4x4x0.65 mm WQFN Package
This product is included in NXP^®.s product longevity program, with assured supply for a minimum of 10 years after launch

Input voltage of 5.0 to 21 V
Boost output voltage up to 60 V
2.0 A integrated boost FET
Fixed boost frequency to 300kHz, 600 kHz or 1.2 MHz
OTP, OCP, UVLO fault detection, LED short/open protection
Programmable LED current between 3.0 mA and 30 mA
24-Ld 4x4x0.65 mm WQFN Package
This product is included in NXP^®.s product longevity program, with assured supply for a minimum of 10 years after launch