AS3685B

AS3685A/AS3685B Product Brief austria micro systems Product Brief AS3685A/AS3685B Ultra Small High Efficiency 700mA Charge Pump for White LED Flash 1 General Description The AS3685 is low noise high efficiency capacitive charge pump with 1:1, 1:1.5 and 1:2 operating modes in a small 3x3mm DFN10 or a tiny 2x1.5mm WL-CSP (Wafer Level Chip Scale Package) package. It can drive one flash led at up to 700mA current. It supports flash/torch and indicator mode for the flash led. Additionally the AS3685 limits the flash time automatically to protect the flash LED. Overtemperature Protection Automatic 800ms Flash Timeout to protect the flash LED (time factory programmable) Two Device Variants: − AS3685A: Direct control to select three currents − AS3685B: Single Pin Interface or Two Pin Interface with Strobe Input; 17 different currents can be selected Package − DFN10 3x3mm (10 pins + exposed pad) − WL-CSP (Wafer Level Chip Scale Package) 3x4 balls 0.5mm pitch (2x1.5mm) 2 Key Features www.DataSheet4U.com High Efficiency capactive charge pump with 1:1, 1:1.5 and 1:2 modes − 1:2 Mode can be disabled (factory programmable) Up to 700mA Led Current Automatic Charge Pump Mode switching (Up) LED cathode disconnect in Shutdown 3 Application Flash / Torch for Mobile Phones, Digital Cameras and PDA 4 Application Diagram Figure 1 – Application Diagram of AS3685A/AS3685B CFLY1 1.0 F CFLY2 1.0 F C1+ C1- C2+ C2VBAT CBAT 2.2 F VBAT VCP AS3685A AS3685B EN1 ILED EN2 ISET VSS CVCP 2.2 F DLED ...