AAT2846
High Current Charge Pump with Dual LDO
for Backlight and Flash Applications
Pin #
23
24
25
26
27
28
EP
Symbol
FEN
FSET
BL6
BL5
ENA
BL4
Description
Flash enable input. FEN is the on/off control for the flash LEDs. Drive FEN high to drive the
maximum flash current, set by RFSET, through the flash LEDs.
Flash current setting input. A 280kΩ resistor from FSET to AGND sets the maximum flash LED
current.
Backlight LED 6 current sink. BL6 controls the current through backlight LED 6. Connect the
cathode of backlight LED 6 to BL6. If not used, connect BL6 to OUT.
Backlight LED 5 current sink. BL5 controls the current through backlight LED 5. Connect the
cathode of backlight LED 5 to BL5. If not used, connect BL5 to OUT.
LDO A enable input. ENA turns on or off low dropout regulator A (LDO A). Drive ENA high to
turn on LDO A; drive low to turn it off.
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.
Exposed paddle (bottom); connect to ground as closely as possible to the device.
Pin Configuration
TQFN44-28
(Top View)
FL1
FEN
FSET
BL6
BL5
ENA
BL4
28
27
26
25
24
23
22
21
20
19
18
17
16
15
8
9
10
11
12
13
14
BL3
BL2
BL1
AGND
CT
REF
FBB
1
2
3
4
5
6
7
FL2
ENS
PGND
IN
C2-
C2+
ENB
OUT
C1+
C1-
OUTA
FBA
IN
OUTB
2846.2007.08.1.0
3
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
