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Freescale Semiconductor
Advance Information
8-Channel LED Driver with Differential
Interface
The 34848 is a high efficiency, 8-channel LED driver for use in LCD
backlighting applications. It is designed to support up to 160 mA /
channels in scan backlight mode, or 80 mA/channels in local dimming
mode. Current reference is set using a single resistor to GND and LED
current tolerance is accurate to ±1% channel-to-channel and IC-to-IC.
The current can be programmed in both local dimming and scan modes.
Each channel has independent PWM control with 10-bit resolution,
programmed with high speed differential interface. The frequency
between ICs is synchronized and derived from Controller (LED Driver
Controller) signals. When the SCAN pin is pulled high, it enables the
Scan mode. In this mode, each of 8 channels is on for nominally 3/8 of
the frame.
The integrated boost controller is used to generate the minimum
output voltage required to keep all LEDs illuminated with the selected
current, providing the highest efficiency possible. The integrated boost
clock can be programmed from 200 kHz to 1.2 MHz.
Features
Document Number: MC34848
Rev. 1.0, 5/2010
MC34848
POWER MANAGEMENT IC
EP SUFFIX (PB-FREE)
98ARH99048A
48-PIN QFN
ORDERING INFORMATION
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Drives 8 LED channels: ±1% current tolerance
Local dimming mode, scan mode (2/8, 3/8, 4/8, 5/8), test mode
Output voltage up to 45 V supporting up to 12 LEDs
Auto drive voltage (V OUT ) selection: Minimum feedback voltage
500 mV for low power
Device
M C34848EP
Temperature
Range (T A )
-40°C to 85°C
Package
48 QFN EP
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Differential Interface: Initial setup (LED current, f PWM , OVP, etc.), PWM data in normal operation
Integrated PLL for synchronization: 177 to 200 Hz in 1.0 Hz steps
10-bit PWM control per channel: Dimming ratio: >1000:1, turn-on time: <200 ns
Pb-free packaging designated by suffix code EP”
24 V
3.0 V
12 V
CPLL
VDC
DVDD
PVCC
GD
OUT_SW
CS
COMP
VLOGIC
SLEW
OVP
AGND
SCAN
SHUT_B
SCAN
SHUT_B
DGND
PGND
SCAN-RESET
SETUP
SCAN-RESET
SETUP
MC34848
ISET
CTRL
LS
LS
CH1
CLK
DATA
STH
CLK(+),(-)
DATA(+).(-)
DIO1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
Figure 1. 34848 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
? Freescale Semiconductor, Inc., 2010. All rights reserved.
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