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AAT2856 Datenblatt(Datasheet) 2 Page - Advanced Analogic Technologies

Teile-Nr. AAT2856
Beschreibung  High Current Charge Pump with Dual LDO for BacklightApplications
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Hersteller  ANALOGICTECH [Advanced Analogic Technologies]
Homepage  http://www.analogictech.com
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AAT2856
High Current Charge Pump with
Dual LDO for BacklightApplications
2
2856.2007.06.1.0
Pin Descriptions
Pin #
Symbol
Description
1
BL3
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.
2
BL2
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.
3
BL1
Backlight LED 1 current sink. BL1 controls the current through backlight LED 1. Connect
the cathode of backlight LED 1 to BL1. If not used, connect BL1 to OUT.
4, 5, 23, 24
AGND
Analog ground. Connect AGND to PGND at a single point as close to the AAT2856 as
possible.
6
REF
Reference output. Bypass REF to AGND with a 0.1µF or larger ceramic capacitor.
7
FBB
Feedback input for LDO B. FBB measures the output voltage of LDO B. Connect a resistive
voltage divider from the output of LDO B to FBB. FBB feedback regulation voltage is 1.2V.
8
OUTB
LDO B regulated voltage output. OUTB is the voltage output of LDO B. Bypass OUTB to
AGND with a 2.2µF or larger ceramic capacitor as close to the AAT2856 as possible.
9, 18
IN
Power input. Connect IN to the input source voltage. Bypass IN to PGND with a 4.7µF or
larger ceramic capacitor as close to the AAT2856 as possible.
10
FBA
Feedback input for LDO A. FBA measures the output voltage of LDO A. Connect a resistive
voltage divider from the output of LDO A to FBA. FBA feedback regulation voltage is 1.2V.
11
OUTA
LDO A regulated voltage output. OUTA is the voltage output of LDO A. Bypass OUTA to
AGND with a 2.2µF or larger ceramic capacitor as close to the AAT2856 as possible.
12
C1-
Negative node of charge pump capacitor 1. Connect the 1µF charge pump capacitor 1
from C1+ to C1-.
13
C1+
Positive node of charge pump capacitor 1. Connect the 1µF charge pump capacitor 1 from
C1+ to C1-.
14, 21, 22
OUT
Charge pump output; supplies current to the backlight LEDs. Connect the backlight LED
anodes to OUT. Bypass OUT to PGND with a 2.2µF or larger ceramic capacitor as close
to the AAT2856 as possible.
15
ENB
LDO B enable input. ENB turns on or off low dropout regulator B (LDO B). Drive ENB high
to turn on LDO B; drive it low to turn it off.
16
C2+
Positive node of charge pump capacitor 2. Connect the 1µF charge pump capacitor 2 from
C2+ to C2-.
17
C2-
Negative node of charge pump capacitor 2. Connect the 1µF charge pump capacitor 2
from C2+ to C2-.
19
PGND
Power ground. Connect AGND to PGND at a single point as close to the AAT2856 as pos-
sible.
20
ENS
Backlight enable and serial control input. ENS turns the backlight on/off and is the
AS
2Cwire input to serially control the backlightLED brightness.
25
BL6
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.
26
BL5
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.
27
ENA
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.
28
BL4
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.
EP
Exposed paddle (bottom); connect to ground as closely as possible to the device.




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