AAT2869 Advanced Analogic Technologies, Inc., AAT2869 Datasheet - Page 2

• Manufacturer Part Number: AAT2869
• Description: Fade-in/fade-out 4 Channel Backlight Driver With Dual Ldos
• Manufacturer: Advanced Analogic Technologies, Inc.

Pin Descriptions
Pin Configuration
2
SystemPower
Pin #
4, 8
10
11
12
13
14
15
16
17
18
EP
1
2
3
5
6
7
9
Symbol
EN/SET
OUTCP
INLDO
AGND
LDOB
LDOA
FCAP
GND
C1+
C2+
C2-
C1-
D1
D2
D3
D4
IN
TM
Function
PG
AG
O
O
O
P
P
I
I
I
I
I
I
I
I
I
I
Description
Flying capacitor C1 positive terminal. Connect a 1μF capacitor between C1+ and C1-.
LDOB output. Four output voltages can be programmed by AS
2.8V is the default output voltage.
LDOA output. Four output voltages can be programmed by AS
1.8V is the default output voltage.
Ground connection.
Analog ground connection.
Input power supply pin to LDOs. Connect this pin to IN. A 1μF capacitor is recommended for
bypass use from this pin to ground.
Input power supply pin. Connect a 1μF bypass capacitor from this pin to ground.
Fade-in/fade-out fi lter. Connect a 1μF capacitor to enable fade-in time of 1s at 20mA LED current
each. If the fade-in/fade-out function is not used, leave this pin fl oating.
LED driver current sink D1. Connect LED cathode to this pin. If not used, please tie to OUTCP.
LED driver current sink D2. Connect LED cathode to this pin. If not used, please tie to OUTCP.
LED driver current sink D3. Connect LED cathode to this pin. If not used, please tie to OUTCP.
LED driver current sink D4. Connect LED cathode to this pin. If not used, please tie to OUTCP.
Charge pump enable/set. When in the low state, AAT2869 is powered down, and consumes less
than 1μA. When EN/SET jumps from low to high, the charge pump is active and 20mA LED cur-
rent each are set. The two LDOs are still inactive until data 3 is written to address 4 through the
AS
Flying capacitor C2 negative terminal. Connect a 1μF capacitor between C1+ and C1-.
Flying capacitor C2 positive terminal. Connect a 1μF capacitor between C2+ and C2-.
Charge pump output. Connect a 1μF bypass capacitor between this pin to ground.
Flying capacitor C1 negative terminal. Connect a 1μF capacitor between C2+ and C2-.
Exposed pad. Connect to ground directly beneath the package.
Fade-In/Fade-Out 4 Channel Backlight Driver with Dual LDOs
2
Cwire interface. This pin should not be left fl oating.
INLDO
w w w . a n a l o g i c t e c h . c o m
AGND
FCAP
GND
TQFN3.0x2.2 -18
IN
(Top View)
5
6
7
8
9
18
17
16
15
14
C1-
OUTCP
C2+
C2-
EN/SET
PRODUCT DATASHEET
2
2
Cwire: 1.2V, 1.5V, 1.8V, and 2.5V.
Cwire: 1.5V, 1.8V, 2.5V, and 3.0V.
AAT2869
2869.2010.01.1.0