B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 Solid State Lighting B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 June 2005 BlueChips Technology A Premier Design Solutions Company ….. Switching Control Current regulator for 1W White LED BCT 3611S Switching Control Current regulator for 1W White LED BCT 3611S

B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 Solid State Lighting B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 June 2005 The Features: BCT 3611S Maximum output current: 350mA Minimal external components (with NO coil) Target low cost application where three standard batteries are preferred Two operation mode: Continuous or Flash: Enter flash mode without hardware switch (by power ON, OFF ->ON) Enter flash mode without hardware switch (by power ON, OFF ->ON) SHDNB is used by µC to turn on/off the converter Internal thermal protection circuit Wide operation temperature: -20 to 70 deg C Available in Pb-free SOP8 package Applications: High Power White LED Torch, Head Lamp White LED Driver for Mobile Phone Handheld Electronics

B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 Solid State Lighting B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 June 2005 System Advantages: High Output current (max. 350mA) Advanced high frequency switching control, very low drop out voltage Condition: Supply voltage > LED forward voltage Condition: Supply voltage > LED forward voltage Two Mode Operation: Continuous or Flash  Enter flash mode without hardware switch Not Standby mode  Minimize the risk of battery leakage and corrosion Multi source of LEDs  Current regulator (irrelevant to the LED forward voltage) High efficiency and lower power consumption  Extend the battery life

B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 Solid State Lighting B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 June 2005 BCT3611S Application LED OFFLED ON S 3*1.5V cell 100  F VOUT GND VIN FLASH CS 2.2uF BCT3611S SHDNB 6, watt LED  F 0.33 ohm + 1F1F S Connected to GND, if flash mode do not needed

B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 Solid State Lighting B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 June 2005 BCT3611 vs xxx7135 BCT3611xxx7135 Minimal External Components Output capacitor, flash capacitor, current sense resistor Max Output Current 350mA (600mA)350mA Operating Voltage 1.8 ~ 6V2.7 ~ 6V Output Current control Resistor at CS pinFixed Switching frequency 1MHzLinear Flash mode Continuous mode or flash mode (one external capacitor) Not support Shunt down Control Yes, PWM by MCUNot support Thermal Protection 110 deg C120 deg C Technology CMOSBiCOMS Power Loss Drop out voltage * Current Package SOP8SOT89-3+1

B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 Solid State Lighting B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 June 2005 BCT 3611S Status E/S: Available in July Demo board: Available in July Production: Q4 2005

B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 Solid State Lighting B L U E CHIPS w w w. b l u e c h i p s t e c h. c o m 藍 科 有 限 公 司 June 2005 Thank You ! Questions & Answer