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Analogic Corporation

AAT1409 Datasheet Preview

AAT1409 Datasheet

8 Channel LED Backlight Driver

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DataSheet.in
PRODUCT DATASHEET
AAT1409
SwitchRegTM 8 Channel LED Backlight Driver with Integrated Boost and High Frequency Direct PWM Dimming
General Description
The AAT1409 is a highly integrated, high efficiency LED
backlight solution for notebook computers, monitors and
portable TVs. The device operates from DC inputs, ciga-
rette lighter adapters, or multi-cell Li-ion batteries over
the 4.5V to 26V voltage range.
An integrated boost (step-up) converter provides up to
45V output for driving series LEDs. Eight precision cur-
rent sinks are programmed up to 45mA per string
through one external RSET resistor, supporting up to 881
white LEDs at 360mA total output current.
LED strings may be disabled or operated in parallel for
increased drive capability. The boost output voltage is
set by the LED string with the highest voltage require-
ment, allowing a wide range of LED characteristics.
The PWM dimming range at 100Hz is up to 1,000:1.
The boost switching frequency is selectable (up to
1.3MHz) to allow optimum efficiency and the smallest
external L/C filtering components. Alternatively, the
device may be synchronized to an external clock.
Boost current mode control provides fast response to
line and load transients. Integrated Light-Load mode
ensures highest efficiency across the entire load range.
Fault tolerant circuitry extends system life by disabling
open LED strings. The unique high voltage current sinks
prevent damage resulting from shorted LEDs.
The AAT1409 is available in the Pb-free, thermally
enhanced 24-pin 3x4 TQFN package.
Features
VIN Range: 4.5V to 5.5V / 5.0V to 26.0V
• LX Rated to 50V
Maximum IOUT: 360mA
• Up to 92% Efficiency
• High Efficiency Light-Load Mode
• 8 LED Current Sinks up to 45mA/each
±2% Accuracy (21mA)
±2% Matching (21mA)
• Flexible Configurations
Disable or Parallel
• Switching Frequency Options
675kHz or 1.3MHz
Synchronize to System Clock
• PWM Direct Dimming Input
Up to 100kHz Prevents Audio Interference
Fast Turn-On/Off
Wide 1,000:1 Dimming Range (100Hz)
• Fault Tolerant: Open/Short LED(s)
• Current Limit Protection
• Over-Voltage Protection
• Over-Temperature Protection
• Soft-Start Minimizes Inrush Current
• TQFN34-24 Low Profile Package
• -40°C to +85°C Temperature Range
Applications
• Monitors
• Notebook Computers
• Portable TV
• Portable DVD Players
• White LED Backlight
1. The maximum number of LEDs in each string is dependent upon the maximum VF of the diodes in that string. Under no event should the voltage at LX be exceeded.
1409.2010.05.1.1
www.analogictech.com
1




Analogic Corporation

AAT1409 Datasheet Preview

AAT1409 Datasheet

8 Channel LED Backlight Driver

No Preview Available !

DataSheet.in
PRODUCT DATASHEET
AAT1409
SwitchRegTM 8 Channel LED Backlight Driver with Integrated Boost and High Frequency Direct PWM Dimming
Typical Application
VIN: 4.5V–26V L1 4.7μH
D1
C1
2.2μF
50V
0805
C3
R1
C2
2.2μF
6.3V
0603
R2
EN
VIN
VCC
LX
OVP
AAT1409
TQFN34-24
PWM
SYNC
COMP
RSET
FSET
CS1
CS2
CS3
CS4
CS5
CS6
CS7
CS8
PGND GND SGND
R3
R4
VOUT: 45V at 240mA
Up to 88 WLED Backlight
C4
2.2μF
50V
0805
2
www.analogictech.com
1409.2010.05.1.1


Part Number AAT1409
Description 8 Channel LED Backlight Driver
Maker Analogic Corporation
PDF Download

AAT1409 Datasheet PDF






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