Datasheet > MC34844

MC34844

更新时间： 2024-09-19 04:40:51

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		驱动器
页数	文件大小	规格书
37页	1829K
描述
10 Channel LED Backlight Driver with Integrated Power Supply

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MC34844 数据手册

Document Number: MC34844

Rev 2.0, 9/2008

Freescale Semiconductor

Product Preview

10 Channel LED Backlight Driver

with Integrated Power Supply

34844

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.

LED DRIVER

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.

EP SUFFIX (PB-FREE)

98ASA10800D

32-PIN QFN-EP

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.

ORDERING INFORMATION

Temperature

Package

Device

Range (T )

Features

PC34844EP/R2

-40°C to 105°C

32 QFN-EP

• Input voltage of 7.0 to 28V

• Boost output voltage up to 60V, with auto V_OUTselection.

• 3.0A integrated boost FET

Applications

• 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

• Monitors - up to 27 inch

• Personal Computer Notebooks

• GPS Screens

• Small screen Televisions

• Pb-free packaging designated by suffix code EP

34844

7.0 to 28V

VIN

SWA

SWB

VDC1

VDC2

VDC3

VOUT

PGNDA

PGNDB

COMP

VCC

SLOPE

FAIL

SCK

SDA

Control Unit

VDC1

PWM

A0/SEN

M/~S

ISET

VDC1

NIN

GND

Figure 1. Simplified Application Diagram (SM-Bus Mode)

* This document contains certain information on a product under development. Freescale

reserves the right to change or discontinue this product without notice

12 3 4 5 6 7...37

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与MC34844相关器件

型号	品牌	获取价格	描述	数据表
MC34844_10	FREESCALE	获取价格	10 Channel LED Backlight Driver
MC34844AEP	FREESCALE	获取价格	10 Channel LED Backlight Driver with Integrated Power Supply
MC34844AEP	NXP	获取价格	LED Backlight Driver, 10 Channel with Integrated Power Supply, QFN 32
MC34844AEPR2	FREESCALE	获取价格	10 Channel LED Backlight Driver with Integrated Power Supply
MC34844EP	FREESCALE	获取价格	10 Channel LED Backlight Driver with Integrated Power Supply
MC34844EP/R2	FREESCALE	获取价格	10 Channel LED Backlight Driver with Integrated Power Supply
MC34845	FREESCALE	获取价格	Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply
MC34845AEP/R2	FREESCALE	获取价格	Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply
MC34845BEP	NXP	获取价格	LED DISPLAY DRIVER, QCC24, 4 X 4 MM, 0.65 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, QFN-24
MC34845BEP/R2	FREESCALE	获取价格	Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply

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