AAT3114AISN-20-T1 AAT [Advanced Analog Technology, Inc.], AAT3114AISN-20-T1 Datasheet - Page 13

• Manufacturer Part Number: AAT3114AISN-20-T1
• Description: High Efficiency 1.5X Fractional Charge Pumps For White LED Applications
• Manufacturer: AAT [Advanced Analog Technology, Inc.]

Driving white LED display module backlights
and individual white LEDs connected in parallel:
The AAT3114/14A D1 to D6 outputs are true con-
stant current sources capable of driving up to 20mA
each over the operation input voltage range. Since
these outputs are true constant current sources,
they may be connected in parallel to drive a single
power output. Any combination of outputs (D1 to
D6) may be connected in parallel. The maximum
total output current is a sum of parallel-connected
AAT3114/14A Application Driving a Display Module With Six Parallel-Connected White LEDs:
AAT3114/14A Dual Backlight Control Circuit:
3113.2006.07.1.9
V
BATTERY
V
BATTERY
Enable Keyboard Backlight
Enable Display Backlight
C
1μF
IN
C
1μF
EN/SET
IN
EN/SET
C
1μF
OUT
C
1μF
OUT
VIN
OUT
AAT3114/14A
EN/SET
VIN
OUT
EN/SET
AAT3114/14A
GND
GND
C1+
C1-
C2+
C2-
D1
D2
D3
D4
D5
D6
C2+
C1+
C1-
High Efficiency 1.5X Fractional Charge
C2-
D1
D2
D3
D4
D5
D6
Pumps For White LED Applications
C1
1μF
C2
1μF
current sources. This feature is particularly useful
to power pre-manufactured display modules that are
pre-wired with white LED backlights connected in a
parallel circuit configuration. All outputs can be con-
nected in parallel to drive groups of LEDs as well.
The internal current source reference circuit bases
feedback from current sensed on the D1 output. For
best operation, the only requirement for this applica-
tion is that the output D1 should always be connect-
ed to the load circuit.
C1
1μF
C2
1μF
D1
R1
D1
Display Backlight
D2
R2
D2
D3
R3
D3
R4
D4
D4
Display Module
Keyboard Backlight
Resistor R is optional
R5
D5
D5
R6
D6
D6
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