AAT2847
Four-Channel Backlight Driver with Dual LDOs
Pin Descriptions
Symbol
Pin #
Function
AAT2847-EE AAT2847-QG/QI
LED2 current channel input. Connect to the cathode of backlight LED 2. If not
used, connect D2 to the OUT pin.
1
D2
D1
D2
D1
LED1 current channel input. Connect to the cathode of backlight LED 1. If not
used, connect D1 to the OUT pin.
2
3
4, 6
5
LDOB
IN
LDOB
IN
Output of LDOB.
Input voltage supply connection.
PGND
PGND
Power Ground.
AAT2847-EE: Feedback pin of LDOA. Internally regulated at 1.2V.
AAT2847-QG/QI: No connection. Do not make any connection to this pin.
Output of LDOA.
7
FBA
NC
8
9
LDOA
C2-
LDOA
C2-
Negative terminal of flying capacitor 2.
10
C2+
C2+
Positive terminal of flying capacitor 2.
Charge pump output to drive load circuit. Connect a 1µF or larger ceramic
capacitor between OUT and PGND.
11
OUT
OUT
12
13
14
15
C1-
C1+
EN/SET
ENB
C1-
C1+
EN/SET
ENB
Negative terminal of flying capacitor 1.
Positive terminal of flying capacitor 1.
2
AS Cwire control pin for backlight LED current profile selection and control.
Enable pin for LDOB. Active logic high.
LED4 current channel input. Connect to the cathode of backlight LED 4. If not
used, connect D4 to the OUT pin.
16
D4
D4
LED3 current channel input. Connect to the cathode of backlight LED 3. If not
used, connect D3 to the OUT pin.
17
D3
D3
18
19
GND
ENA
GND
ENA
Ground.
Enable pin for LDOA. Active logic high.
AAT2847-EE: Feedback pin of LDOB. Internally regulated at 1.2V.
AAT2847-QG/QI: No connection. Do not make any connection to this pin.
Exposed pad (bottom).
20
FBB
N/C
EP
2
2847.2007.09.1.0