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Datasheet
AS3647/47B
1600mA High Current LED Flash Driver
1 General Description
The AS3647/47B is an inductive high efficient DCDC
step up converter with two current sinks. The DCDC
step up converter operates at a fixed frequency of 4MHz
and includes soft startup to allow easy integration into
noise sensitive RF systems. The two current sinks can
operate in flash / torch / assist (=video) light modes.
2 Key Features
?? High efficiency 4MHz fixed frequency DCDC Boost
converter with soft start allows small coils
- Stable even in coil current limit
?? LED current adjustable up to 1600mA
The AS3647/47B includes flash timeout, overvoltage,
?? Automatic
current adjustment for low battery voltage
The AS3647/47B is controlled by an I C interface and
?? I
C Interface with automatic shutdown
overtemperature, undervoltage and LED short circuit
protection functions. A TXMASK/TORCH function
reduces the flash current in case of parallel operation to
the RF power amplifier and avoids a system shutdown.
Alternatively this pin can be used to directly operate the
torch light directly.
2
has a hardware automatic shutdown if SCL=0 for
100ms. Therefore no additional enable input is required
for shutting down of the device once the system shuts
down.
?? PWM operation for lower output current for reliable
light output of the LED; running at 31.25kHz to avoid
audible noise
?? Protection functions:
Automatic Flash Timeout timer to protect the LED(s)
Overvoltage and undervoltage Protection
Overtemperature Protection
LED short/open circuit protection
2
?? 5V constant voltage mode operation
?? Available
in tiny WL-CSP Packages, 13 balls 0.5mm
pitch 2.25x1.5x0.6mm, 15 balls 0.4mm pitch
The AS3647/47B is available in a space-saving WL-
CSP package measuring only 2.25x1.5x0.6mm
(AS3647B: 2.25x1.5x0.5mm) and operates over the -
30oC to +85oC temperature range.
Figure 1. Typical Operating Circuit
2.25x1.5x0.5mm package size
3 Applications
Flash/torch/videolight for smartphones, feature-phones,
tablets, DSCs, DVCs
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AS3647/47B
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www.austriamicrosystems.com/AS3647
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