Backlight Driver. MC34844 Datasheet

MC34844 Driver. Datasheet pdf. Equivalent

MC34844 Datasheet
Recommendation MC34844 Datasheet
Part MC34844
Description 10 Channel LED Backlight Driver
Feature MC34844; Freescale Semiconductor Technical Data 10 Channel LED Backlight Driver with Integrated Power Supply.
Manufacture NXP
Datasheet
Download MC34844 Datasheet




NXP MC34844
Freescale Semiconductor
Technical Data
10 Channel LED Backlight Driver
with Integrated Power Supply
Document Number: MC34844
Rev. 10.0, 8/2014
34844
The 34844 is a SMARTMOS high efficiency, LED driver for use in
backlighting LCD displays from 10" to 20"+. Operating from supplies of 7.0 to
28 V, the MC34844 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 34844 has an integrated boost self-clock at a default frequency of
600 kHz, but may be programmed via I2C to 150/300/600/1200 kHz. The PWM
frequency can be set from 100 Hz to 25 kHz, 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 has a default boost frequency of 320 kHz, but may be
programmed via I2C to 160/320/650/1300 kHz. The PWM frequency can be set
from 110 Hz to 27 kHz, 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
features LED overtemperature protection, LED short protection, and LED open
circuit protection. The IC includes overvoltage protection, overcurrent
protection, and undervoltage lockout.
LED DRIVER
EP SUFFIX (PB-FREE)
98ASA10800D
32-PIN QFN-EP
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.



NXP MC34844
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. MC34844 Simplified Application Diagram (Manual Mode)
34844
2
Analog Integrated Circuit Device Data
Freescale Semiconductor



NXP MC34844
ORDERABLE PARTS
ORDERABLE PARTS
This section describes the part numbers available to be purchased along with their differences. Valid orderable part numbers are provided
on the web. To determine the orderable part numbers for this device, go to http://www.freescale.com and perform a part number search for
the following device numbers.
Table 1. Orderable Part Variations
Part Number
Notes
Temperature (TA)
MC34844AEP
(1) -40 to 105 °C
Notes:
1. To order parts in Tape & Reel, add the R2 suffix to the part number.
32 QFN-EP
Package
Analog Integrated Circuit Device Data
Freescale Semiconductor
34844
3







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