AAT2845A Datasheet, PDF (2/19 Pages) Advanced Analogic Technologies – Four-Channel Backlight Driver with Dual LDOs

AAT2845A
Four-Channel Backlight Driver with Dual LDOs
Pin Descriptions
Pin #
1
2
3
4
Symbol
D2
D1
LDOB
IN
5
PGND
6
IN
7
FBA
8
LDOA
9
C2-
10
C2+
11
OUT
12
C1-
13
C1+
14
EN/SET
15
ENLDO
16
D4
17
D3
18
GND
19
CBP
20
FBB
EP
Function
Current sink input #2.
Current sink input #1.
Output of LDO B. Connect a 2.2µF or larger ceramic capacitor to ground.
Input power supply for charge pump. Requires a 1µF or larger ceramic capacitor connected
between this pin and ground.
Power ground.
Input power pin for both LDOs. Connect a 1µF or larger ceramic capacitor from this pin to
PGND.
Feedback pin of LDO A. Regulated at 1.2V.
Output of LDO A. Connect a 2.2µF or larger ceramic capacitor to ground.
Flying capacitor 2 negative terminal.
Flying capacitor 2 positive terminal. Connect a 1µF ceramic capacitor between C2+ and C2-.
Charge pump output to drive load circuit. Connect a 1µF or larger ceramic capacitor between
this pin and PGND.
Flying capacitor 1 negative terminal.
Flying capacitor 1 positive terminal. Connect a 1µF ceramic capacitor between C1+ and C1-.
S²Cwire control pin for backlighting.
Enable pin for LDO A and B.
Current sink input #4.
Current sink input #3.
Ground.
Bypass pin for the internal reference. Connect a 0.1µF ceramic capacitor from this pin to GND.
Feedback pin of LDO B. Regulated at 1.2V.
Exposed paddle (bottom); connect to PGND as closely as possible to the device.
Pin Configuration
TQFN34-20
(Top View)
D2 ¹
D1 ²
LDOB ³
IN ⁴
PGND ⁵
IN ⁶
16 _D4
15 _ENLDO
14 _EN/SET
13 _C1+
12 _C1-
11 _OUT
2
2845A.2007.05.1.0