NXP Semiconductors 34844
The 34844 is a SMARTMOS high efficiency, LED driver for use in backlighting LCD displays from 10" to 20"+. The 34844 also includes a Pulse Width Monitor (PWM) generator for LED dimming. The LEDs can be dimmed to one of 256 levels, programmed through the I2C/SM Bus interface.| Part No. | 34844 |
|---|---|
| Datasheet | 34844 Download |
| Manufacturer |  NXP Semiconductors |
| Description | 10 Channel LED Backlight Driver |
| Buy | Stock & Price |
APPLICATIONS
● Monitors and HDTV - up to 42 inch● Personal Computer Notebooks
● GPS Screens
● Small screen Televisions
FEATURES
● Input voltage of 7.0 to 28 V● 2.5 A integrated boost FET
● Up to 80 mA on the 34844 LED current per channel
● 90% efficiency (DC:DC)
● I2C/SM Bus interface
● 10 channel current mirror with ±2.0% current matching
● Boost output voltage up to 60V, with Dynamic Headroom Control (DHC)
● PWM frequency programmable or synchronizable from 110 to 27,000 Hz
● 32-Ld 5x5x1.0 mm TQFN Package © Freescale Semiconductor, Inc., 2009-2014. All rights reserved. 7.0 to 28 V Control Unit VDC1 VDC1 VDC1 VIN VDC1 VDC2 VDC3 34844 SWA SWB VOUT COMP SLOPE PGNDA PGNDB SCK SDA PWM A0/SEN CK M/~S EN ISET PIN NIN GND FAIL I0 I1 I2 I3 I4 I5 I6 I7 I8 I9 VCC ~~~~~~~~~~ Figure 1. MC34844 Simplified Application Diagram (SM Bus Mode) 7.0 to 28V PWM Control Unit PWM VOUT VDC1 VDC1 VIN VDC1 VDC2 VDC3 34844 SWA SWB VOUT COMP SLOPE PGNDA PGNDB SCK SDA PWM A0/SEN CK M/~S EN ISET PIN NIN GND FAIL I0 I1 I2 I3 I4 I5 I6 I7 I8 I9 VOUT VCC ~~~~~~~~~~ Figure 2.
