AAT2847IML-EE-T1 Advanced Analog Technology, Inc., AAT2847IML-EE-T1 Datasheet - Page 2

• Manufacturer Part Number: AAT2847IML-EE-T1
• Description: Four-Channel Backlight Driver with Dual LDOs
• Manufacturer: Advanced Analog Technology, Inc.

Pin Descriptions
Pin Configuration
2
2
ChargePump
ChargePump
Pin #
4, 6
10
11
12
13
14
15
16
17
18
19
20
EP
1
2
3
5
7
8
9
AAT2847-EE
EN/SET
PGND
LDOB
LDOA
GND
PGND
C2+
OUT
C1+
FBA
ENB
ENA
FBB
C2-
C1-
LDOB
D2
D1
D4
D3
IN
TM
TM
D2
D1
IN
IN
AAT2847-EE
Symbol
TQFN34-20
(Top View)
1
2
3
4
5
6
AAT2847-QG/QI
EN/SET
LDOB
PGND
LDOA
GND
C2+
OUT
C1+
ENB
ENA
16
15
14
13
12
11
N/C
C2-
C1-
D2
D1
NC
D4
D3
IN
D4
ENB
EN/SET
C1+
C1-
OUT
Function
LED2 current channel input. Connect to the cathode of backlight LED 2. If not
used, connect D2 to the OUT pin.
LED1 current channel input. Connect to the cathode of backlight LED 1. If not
used, connect D1 to the OUT pin.
Output of LDOB.
Input voltage supply connection.
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.
Negative terminal of fl ying capacitor 2.
Positive terminal of fl ying capacitor 2.
Charge pump output to drive load circuit. Connect a 1µF or larger ceramic ca-
pacitor between OUT and PGND.
Negative terminal of fl ying capacitor 1.
Positive terminal of fl ying capacitor 1.
AS
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.
LED3 current channel input. Connect to the cathode of backlight LED 3. If not
used, connect D3 to the OUT pin.
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).
w w w . a n a l o g i c t e c h . c o m
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2
Cwire control pin for backlight LED current profi le selection and control.
Four-Channel Backlight Driver with Dual LDOs
Four-Channel Backlight Driver with Dual LDOs
PGND
LDOB
D2
D1
IN
IN
AAT2847-QG/QI
PRODUCT DATASHEET
PRODUCT DATASHEET
TQFN34-20
1
2
3
4
5
6
(Top View)
AAT2847
AAT2847
16
15
14
13
12
11
D4
ENB
EN/SET
C1+
C1-
OUT
2847.2008.05.1.2
2847.2008.05.1.2