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AAT3119 Datasheet(PDF) 13 Page - Advanced Analogic Technologies

Part No. AAT3119
Description  High Efficiency 2X Charge Pump
Download  18 Pages
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

AAT3119 Datasheet(HTML) 13 Page - Advanced Analogic Technologies

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Flash LED Driver
The AAT3119 can source 250mA for pulsed loads
up to 500ms from an input supply as low as 3.3V.
This makes the device well suited for low-cost flash
LED driver applications in portable products.
Typically the 4.5V output version of the AAT3119
should be selected for photo-flash LED applica-
tions, as it can maintain better voltage regulation at
higher pulsed load current levels (refer to Figure 2).
The limitation of this option is that the greatest flash
LED forward voltage (VF) that can be driven is 4.5V
at the maximum set forward current (IF) for the
application. Flash LEDs with forward voltage (VF)
levels up to 5.0V can be driven by the AAT3119
5.0V output option. However, the maximum cur-
rent for a 500ms pulse will be reduced. Refer to
the Typical Characteristics curves for peak output
current levels for a given minimum input voltage.
The forward current (IF) through the flash LED may
be determined with the use of a series ballast resis-
tor. The typical forward voltage (VF) for the flash
LED in a given application should be derived from
the LED manufacturer's datasheet for the desired
forward current (IF) of the flash application. Once
the forward current has been determined, the flash
ballast resistor can be calculated using the follow-
ing equation:
Where:
RF
=
Flash ballast resistor value in ohms (
Ω)
VOUT =
Regulated charge pump output voltage
(typically 4.5V)
VF
=
Flash LED forward voltage at the
desired forward current
IF
=
Desired flash LED forward current
The flash LED function can be controlled by the
AAT3119 enable pin in most applications. The
device start-up time into a maximum load is about
200μs, thus eliminating the need for pre-flash con-
trol synchronization.
R
F =
(V
OUT - VF)
I
F
AAT3119
High Efficiency 2X Charge Pump
3119.2007.02.1.2
13
Figure 1: White LED Driver.
AAT3119
IN
GND
EN
OUT
COUT
C
IN
1μF
1μF
1μF
C1+
C1-
D1
D2
D3
D4
D5
D6
C
FLY
RB2
RB3
RB4
RB5
RB1
RB6
V
BATTERY
Enable


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