AAT1407 Advanced Analogic Technologies, Inc., AAT1407 Datasheet - Page 3

• Manufacturer Part Number: AAT1407
• Description: 6 Channel Led Backlight Driver With Integrated Boost And High Frequency Direct Pwm Dimming
• Manufacturer: Advanced Analogic Technologies, Inc.

Pin Descriptions
Pin Configuration
1407.2010.06.1.0
SwitchReg
14, 18, 21
3, 4, 13,
Pin #
10
11
12
15
16
17
19
20
22
23
24
EP
1
2
5
6
7
8
9
TM
Symbol
6 Channel LED Backlight Driver with Integrated Boost and High Frequency Direct PWM Dimming
SGND
COMP
PGND
SYNC
RSET
FSET
GND
PWM
CS1
CS2
CS3
CS4
CS5
CS6
OVP
VCC
EN
LX
IN
Function Description
GND
GND
GND
GND
I/O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
Synchronizes switching frequency to external system clock. Tie to GND to disable this feature.
Connect logic high to set internal oscillator to 1300kHz. Connect logic low to set internal oscil-
lator to 675kHz.
Connect to GND.
Direct PWM input pin. Connect logic level PWM input signal in the frequency range 100Hz-
100kHz to this pin to enable PWM dimming.
Output current sink 1. Connect to SGND to disable channel 1.
Output current sink 2. Connect to SGND to disable channel 2.
Output current sink 3. Connect to SGND to disable channel 3.
Output current sink 4. Connect to SGND to disable channel 4.
Current sink ground tied to return of internal current sinks CS1-CS6.
Output current sink 5. Connect to SGND to disable channel 5.
Output current sink 6. Connect to SGND to disable channel 6.
Connect resistor to ground to set maximum current through the LED strings.
Connect an external resistor and capacitor to ground to compensate the boost converter.
Over-voltage protection pin. Connect resistive divider between VOUT and GND. Care should
be taken to ensure that the voltage at LX does not exceed its maximum rating under extreme
operating conditions.
Switching node of boost converter. Connect an inductor between this pin and input voltage
source. Connect the anode of Schottky diode between this pin and the boost output capacitor.
Power ground; tied to source of integrated NMOS switching device.
Internal regulated voltage when operating from input voltage range 5.0V to 26.0V. De-couple
with a 2.2μF capacitor to ground. Do not source current from this node. Input voltage pin
when operating from input voltage range 4.5V to 5.5V.
Logic high enable pin. Pull logic high or tie to IN to enable the device. Pull low to disable the
device and minimize quiescent current; pulling low also disables the internal linear regulator.
Input voltage to IC. Tied to input voltage source and input boost inductor.
Exposed paddle. Connect to PCB GND plane. PCB paddle should maintain acceptable junction
temperature.
SYNC
FSET
PWM
GND
GND
CS1
CS2
w w w . a n a l o g i c t e c h . c o m
1
2
3
4
5
6
7
TQFN34-24
(Top View)
24
8
23
9
EP
22
10
11
21
12
20
19
18
17
16
15
14
13
LX
GND
OVP
COMP
RSET
GND
GND
PRODUCT DATASHEET
AAT1407
3