34844_08 datasheet, PDF - EEWORLD Datasheet

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34844_08: DescriptionLED DISPLAY DRIVER, QCC32; Categorysemiconductor Analog mixed-signal IC; File Size1MB，36 Pages; ManufacturerFREESCALE (NXP)

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34844_08 Overview

LED DISPLAY DRIVER, QCC32

34844_08 Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	32
Maximum operating temperature	105 Cel
Minimum operating temperature	-40 Cel
Maximum supply voltage 1	28 V
Minimum supply voltage 1	7 V
Rated supply voltage 1	12 V
Processing package description	5 × 5 MM, 1 MM HEIGHT, ROHS COMPLIANT, TQFN-32
Lead-free	Yes
EU RoHS regulations	Yes
China RoHS regulations	Yes
state	DISCONTINUED
packaging shape	SQUARE
Package Size	Chip CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
surface mount	Yes
Terminal form	NO
Terminal spacing	0.5000 mm
terminal coating	NOT SPECIFIED
Terminal location	Four
Packaging Materials	UNSPECIFIED
Temperature level	INDUSTRIAL
Max-Min frequency	0.4000 MHz
data entry mode	serial
Interface Type	LED display driver
number of segments	10
Multiplex display capability	Yes

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Freescale Semiconductor

Advance Information

Document Number: 34844

Rev. 3.0, 11/2008

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 I

C/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 I

C/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

C 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 Dynamic

Headroom Control (DHC)

• 3.0A integrated boost FET

• Up to 50mA LED current per channel

• 90% efficiency (DC:DC)

• 10-channel current mirror with ±2% current matching

• I

C/SM-Bus interface

• PWM frequency programmable or synchronizable from

100Hz to 25,000Hz

• 32-Ld 5x5x1.0mm TQFN Package

• Pb-free packaging designated by suffix code EP

7.0 to 28V

34844

LED DRIVER

EP SUFFIX (PB-FREE)

98ASA10800D

32-PIN QFN-EP

ORDERING INFORMATION

Device

MC34844EP/R2

Temperature

Range (T

)

-40°C to 105°C

Package

32 QFN-EP

Applications

•

Monitors - up to 27 inch

Personal Computer Notebooks

GPS Screens

Small screen Televisions

34844

VIN

VDC1

VDC2

VDC3

COMP

SLOPE

SCK

SDA

PWM

A0/SEN

M/~S

VDC1

ISET

NIN

GND

VOUT

PGNDA

PGNDB

FAIL

VCC

SWA

SWB

Control Unit

VDC1

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

* This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

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