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AS3643

austriamicrosystems
Part Number AS3643
Manufacturer austriamicrosystems
Description 1300mA High Current LED Flash Driver
Published Feb 18, 2015
Detailed Description valid Datasheet AS3643 1300mA High Current LED Flash Driver 1 General Description The AS3643 is an inductive high eff...
Datasheet PDF File AS3643 PDF File

AS3643
AS3643


Overview
valid Datasheet AS3643 1300mA High Current LED Flash Driver 1 General Description The AS3643 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.
The AS3643 includes flash timeout, overvoltage, 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.
The AS3643 is controlled by an I2C interface and 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.
The AS3643 is available in a space-saving WL-CSP package measuring only 2.
25x1.
5x0.
6mm and operates over the -30ºC to +85ºC temperature range.
Figure 1.
Typical Operating Circuit 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 1300mA Automatic current adjustment for low battery voltage 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 I2C Interface with automatic shutdown 5V constant voltage mode operation Available in tiny WL-CSP Package, 13 balls 0.
5mm pitch 2.
25x1.
5x0.
6mm, package size 3 Applications Flash/torch/videolight for smartphones, feature-phones, tablets, DSCs, DVCs coantmesntAsGtill  % ()*   ) !"# +',   ...


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