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AS3642

austriamicrosystems
Part Number AS3642
Manufacturer austriamicrosystems
Description Ultra Small 500mA Inductive White LED Flash Driver
Published Feb 18, 2015
Detailed Description valid Datasheet AS3642 Ultra Small 500mA Inductive White LED Flash Driver 1 General Description The AS3642 is an indu...
Datasheet PDF File AS3642 PDF File

AS3642
AS3642

Overview
valid Datasheet AS3642 Ultra Small 500mA Inductive White LED Flash Driver 1 General Description The AS3642 is an inductive high efficient DCDC step up converter driving a current source.
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 current source operates in flash/torch/assist (video/autofocus) and indicator mode.
The AS3642 includes flash timer, overvoltage, overtemperature, undervoltage and LED short circuit protection functions.
The AS3642 is able to detect a broken coil.
Together with the LED short and open detection the AS3642 can be used to verify the connection to its external components and allowing in-circuit test.
This reduces test time and simplifies production test procedures.
The AS3642 is controlled by an I2C interface to allow sophisticated control of all settings like currents and timings.
The complete flash driver solution measures only 11mm2 PCB area.
The AS3642 is available in a space-saving WL-CSP package measuring only 1.
5x1.
1x0.
6mm and operates over the -30ºC to +85ºC temperature range.
Figure 1.
Typical Operating Circuit 2 Key Features Total flash driver solution only 11mm2 High efficiency 4MHz fixed frequency DCDC Boost converter with soft start allows small coils LED currents Up to 500mA flash current (15.
6mA steps) Up to 320mA torch current (10mA steps) 1.
35mA,2.
9mA,4.
4mA or 6mA indicator light current (PWM with 1.
.
.
4/32 duty cycle) Flash LED(s) cathode connected to ground: Improved thermal performance (ground = heat sink) Simplified PCB layout Adjustable Flash Timer 30ms to 480ms in 30ms steps Flash, Torch, Assist and Indicator Mode Protection functions: Automatic Flash timer to protect the LED Overvoltage and undervoltage Protection Overtemperature Protection LED short circuit protection Available in tiny WL-CSP Packages 2x3 balls 0.
5mm pitch, 1.
5x1.
1x0.
6mm package size 3 Applications Flash/Torch for mobile phon...


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