AAT2842 Datasheet, PDF (3/21 Pages) Advanced Analogic Technologies – High-Current Charge Pump with S2Cwire™ Control and Dual LDO for Backlight and Flash

AAT2842
High-Current Charge Pump with S²Cwire™
Control and Dual LDO for Backlight and Flash
Pin Descriptions (continued)
Pin #
24
25
26
27
28
EP
Symbol
FENS
BENS
BL4
BL3
BL2
Description
Flash enable and serial control input. FENS is the on/off control for the flash and the S²Cwire
input to serially control the flash LED brightness relative to the maximum current set by the
resistor at FSET.
Backlight enable and serial control input. BENS is the on/off control for the backlight and the
S²Cwire input to serially control the backlight LED brightness relative to the maximum current
set by the resistor at BSET.
Backlight LED 4 current sink. BL4 controls the current through Backlight LED 4. Connect the
cathode of Backlight LED 4 to BL4. If not used, connect BL4 to OUT.
Backlight LED 3 current sink. BL3 controls the current through Backlight LED 3. Connect the
cathode of Backlight LED 3 to BL3. If not used, connect BL3 to OUT.
Backlight LED 2 current sink. BL2 controls the current through Backlight LED 2. Connect the
cathode of Backlight LED 2 to BL2. If not used, connect BL2 to OUT.
Exposed paddle (bottom); connect to PGND as closely as possible to the device.
Pin Configuration
TQFN44-28
(Top View)
BL1 ¹
BSET ²
FSET ³
AGND ⁴
CT ⁵
REF ⁶
FBB ⁷
28 27 26 25 24 23 22
8 9 10 11 12 13 14
21 _FL3
20 _FL4
19 _PGND
18 _IN
17 _C2-
16 _C2+
15 _ENL
2842.2006.10.1.0
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