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| AAT2801 Datasheet, PDF (19/20 Pages) Advanced Analogic Technologies – Multi-Mode Charge Pump for White LED Backlight and Flash Applications | |||
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AAT2801
Multi-Mode Charge Pump for
White LED Backlight and Flash Applications
C3
1μF
C3+ C3-
4.5V
VIN
IN OUT_FLSH
CIN
1μF
COUT
1μF
AAT2801
Flash Enable
EN_FLSH
RL
Flash LED
RB
Flash Enable
Figure 2: Flash LED Driver with Gated Flash Application.
RB =
(VOUT - VF)
IF
- RDS
Where:
RB =
RDS =
VOUT =
VF =
IF
=
Flash ballast resistor value in ohms (Ω)
Flash gating mosfet on resistance
Regulated charge pump output voltage
(typically 4.5V)
Flash LED forward voltage at the
desired forward current
Desired flash LED forward current
2801.2006.04.1.3
19
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