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34844 Datasheet(PDF) 1 Page - Freescale Semiconductor, Inc |
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34844 Datasheet(HTML) 1 Page - Freescale Semiconductor, Inc |
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1 / 37 page  Document Number: MC34844 Rev 2.0, 9/2008 Freescale Semiconductor Product Preview © Freescale Semiconductor, Inc., 2008. All rights reserved. * This document contains certain information on a product under development. Freescale reserves the right to change or discontinue this product without notice 10 Channel LED Backlight Driver with Integrated Power Supply The 34844 is a high efficiency, LED driver for use in backlighting LCD displays from 10" to 20"+. Operating from supplies of 7V to 28V, the 34844 is capable of driving up to 160 LEDs in 10 parallel strings. Current in the 10 strings is matched to within ±2%, and can be programmed via the I2C/SM-Bus interface. 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. Up to 65,000:1 (256:1 PWM, 256:1 Current DAC) dimming ratio. The integrated boost converter generates the minimum output voltage required to keep all LEDs illuminated with the selected current, providing the highest efficiency possible. The integrated boost self- clocks at a default frequency of 600kHz, but may be programmed via I2C to 150/300/600/1200 kHz. The PWM frequency can be set from 100Hz to 25kHz, or can be synchronized to an external input. If not synchronized to another source, the internal PWM rate outputs on the CK pin. This enables multiple devices to be synchronized together. The 34844 also supports optical/temperature closed loop operation and also features LED over-temperature protection, LED short protection, and LED open circuit protection. The IC also includes over- voltage protection, over-current protection, and under-voltage lockout. Features • Input voltage of 7.0 to 28V • Boost output voltage up to 60V, with auto VOUT selection. • 3.0A integrated boost FET • Up to 50mA LED current per channel • 90% efficiency (DC:DC) • 10-channel current mirror with ±2% current matching •I2C/SM-Bus interface • PWM frequency programmable or synchronizable from 100Hz to 25,000Hz • Pb-free packaging designated by suffix code EP Applications • Monitors - up to 27 inch • Personal Computer Notebooks • GPS Screens • Small screen Televisions Figure 1. Simplified Application Diagram (SM-Bus Mode) LED DRIVER 34844 EP SUFFIX (PB-FREE) 98ASA10800D 32-PIN QFN-EP ORDERING INFORMATION Device Temperature Range (TA) Package PC34844EP/R2 -40°C to 105°C 32 QFN-EP 7.0 to 28V FAIL PGNDA 34844 SWA SWB VOUT PGNDB I0 I1 I2 I3 I4 I5 I6 I7 I8 I9 VCC GND SCK SDA A0/SEN ISET PIN NIN VIN VDC1 VDC2 VDC3 COMP SLOPE CK EN PWM Control Unit M/~S VDC1 VDC1 ~~ ~~ ~~ ~~ ~~ ~~ ~~ ~~ ~~ ~~ VDC1 |
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