austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com Datasheet AS3648 2000mA High Current LED Flash Driver 1 General Description 2 Key Features High efficiency 4MHz fixed frequency DCDC Boost The AS3648 is an inductive high efficient DCDC step up converter with soft start allows small coils converter with two current sinks. The DCDC step up converter operates at a fixed frequency of 4MHz and - Stable even in coil current limit includes soft startup to allow easy integration into noise LED current adjustable up to 2000mA sensitive RF systems. The two current sinks can oper- Two LED operation or single LED operation (com- ate in flash / torch / assist (=video) light modes. bine LED OUT1 with LED OUT2) The AS3648 includes flash timeout, overvoltage, over- Automatic current adjustment for low battery voltage temperature, undervoltage and LED short circuit protec- tion functions. A TXMASK/TORCH function reduces the PWM operation for lower output current for reliable flash current in case of parallel operation to the RF light output of the LED running at 31.25kHz to avoid power amplifier and avoids a system shutdown. Alterna- audible noise tively this pin can be used to directly operate the torch Protection functions: light directly. Automatic Flash Timeout timer to protect the LED(s) 2 Overvoltage and undervoltage Protection The AS3648 is controlled by an I C interface and has a Overtemperature Protection hardware automatic shutdown if SCL=0 for 100ms. LED short/open circuit protection Therefore no additional enable input is required for shut- 2 ting down of the device once the system shuts down. I C 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 The AS3648 is available in a space-saving WL-CSP package measuring only 2.25x1.5x0.6mm and operates over the -30C to +85C temperature range. 3 Applications Figure 1. Typical Operating Circuit Flash/torch/videolight for smartphones, feature-phones, tablets, DSCs, DVCs ) *+ % * * .- /% & ,( - + & 0 ( ( ( ( ( AS3648 www.austriamicrosystems.com/AS3648 1.5-4 1 - 38 (ptr) ams AG Technical content still valid