CDT2500 350mA Power LED Current Regulator 產品說明(General Description) 產品特性(Features) CDT2500 是一顆低噪音的 LED 驅 動 IC,設計應用於推動定電流 350mA power LED,具有低壓降、 低工作電流與快速的暫態響應的 良好特性,並且因為所需的外部 零件不多,使其非常適合用在以 電池驅動可推的電路中 輸入電壓:2.7V~6V 保證 350mA 輸出電流 低壓降耗損 低工作電流 快速的暫態響應 輸入電壓範圍 2.7V--6V LED 開路/短路保護 過溫保護 SOP-8 與 TO-252 包裝 產品應用(Applications) LED 手電筒 Power LED 驅動器 腳位圖(Pin Assignment) TO-252 SOT-89 (Top View) (Top View) 2 GND PIN ON 1 2 3 1 1 2 OUT GND PIN NAME OUT GND VDD 3 VDD 1 OUT FUNCTION 輸出腳位 電位參考點 電源正端 3 VDD z 功能方塊圖(Block Diagram) Thermal Shutdown OUT Bandgap Vref VDD GND z Absolute Maximum Ratings y Supply Voltage ------------------ -0.3V y Input Voltage --------------------y Operating Temperature --------y Storage Temperature------------- 0.3V to VDD+0.3V -40℃ to 85℃ -50℃ to 150℃ to 7.0V * Note:Stresses above those listed may cause permanent damage to the devices. z Electrical Characteristic ( VDD=3.7V, TA = 25℃, no load, unless otherwise specified) Symbol Parameter Condition Min. Typ. Max. Units 6.0 V 390 mA VDD Input Voltage IOUT Output Current VOUT=0.2V UVLOAD Load Regulation VOUT=0.2V~3V 3 mA/V UVLINE Line Regulation VDD=3V~6V VOUT=0.2V 3 mA/V VDROP Output Dropout Voltage (Note1) 120 mV IVDD Operating Current 200 uA 2.7 Note1:Output dropout voltage:90% * IOUT @ VOUT = 200mV 315 350 z 功能說明(Function Description) y 定電流功能 350mA 的定電流是由 IC 內部的電阻設定完成,不需要外加的電阻。 IC 內部的低壓降 電流源也維持 LED 精確的電流。 z 應用線路圖(Application Circuit) VDD 3 CDT2500 2.7V~6.0V 2 GND 1 OUT z 封裝外觀圖(Package Information) y SOT-89-3PIN outline dimensions D D1 POLISHED(2X) E H L B1 1 2 C 3 B 10 (2X) A e e1 Symbols MIN. MAX. A B B1 C D D1 E H e e1 L 1.40 0.44 0.36 0.35 4.40 1.35 2.29 3.94 1.60 0.56 0.48 0.44 4.60 1.83 2.60 4.25 1.50 BSC 3.00 BSC 0.89 1.2 UNIT:MM NOTES. 1. 2. JEDEC OUTLINE:TO-243 AA DIMENSION B1, 2 PLACES. y TO-252-3PIN outline dimensions A E A1 b2 c1 E1 4 D1 SEATING PLANE L2 H SEE NOTE 2 2 1 L1 3 e b c L e1 Symbols A A1 b b2 c c1 D E D1 E1 e e1 H L L1 L2 MIN. MAX. 0.086 0.094 0.040 0.050 0.024 TYP. 0.205 0.215 0.018 0.023 0.018 0.023 0.210 0.220 0.250 0.265 - 0.180 - 0.150 0.090 BSC. 0.180 BSC. 0.370 0.410 - 0.020 0.250 0.040 0.060 0.080 NOTES. 1. 2. JEDEC OUTLINE:TO-252 AB 2 MILS SUGGESTED FOR POSITIVE CONTACT AT MOUNTING. VARIATIONS (ALL DIMENSIONS SHOWN IN INCH) * CDT assumes no responsibility for the use of the specification described. CDT reserves the right to modify the product specification without notice. ( 以上規格僅供參考,本公司得逕行修正,不另通知 )