BL8505-272SM

BL8505 High Efficiency PFM Step-up DC/DC Converter Outline Features Applications Selection Guide BL8505 XX X XX package Pin Configurations Function description Output voltage www.belling.com.cn Ver1.1 1/10 BL8505 Pin Description: Pin No. SOT-89-3 TO-92 SOT-23-3 SOT-89-5 SOT-23-5 Symbol Description Product List: Product Name Output Voltage LX Tr. Driver Chip Enable Package Block Diagram Absolute Maximum Ratings: www.belling.com.cn Ver1.1 2/10 BL8505 Recommended Operating Conditions: Min Nom Max Unit *Suggestion Electrical Characteristics: Symbol Item Test Conditions Min Reference Data Typ. Max Unit www.belling.com.cn Ver1.1 3/10 BL8505 Typical Characteristics Detailed Description: Selection Of The External Components: D 1 Inductor Selection Vout Vin Vout www.belling.com.cn Ver1.1 4/10 BL8505 L min D(1 D) RL 2f 2 Lmin D Vin Lf Vin Im ax (1 D) 2 RL I DVin 2 Lf rL Rload (1 D) 2 2 Capacitor Selection r Vout Vout D Rload Cf r' r Im ax RESR Vout 3 Diode Selection www.belling.com.cn Ver1.1 5/10 BL8505 4 Input Capacitor Test Circuits 3 www.belling.com.cn Ver1.1 6/10 BL8505 Typical Characteristics L=10uH 3.5 3.4 Vin=0.9V Vin=1.0V Vin=1.5V Vin=1.8V Vin=2.0V Output Voltage(V) 3.3 3.2 3.1 3 2.9 2.8 2.7 0 50 100 150 200 250 300 350 400 450 500 Output Current(mA) www.belling.com.cn Ver1.1 7/10 BL8505 L=10uH 100 (%) 90 80 70 60 50 0 50 100 150 200 250 300 350 400 Vin=0.9V Vin=1.0V Vin=1.5V Vin=1.8V Vin=2.0V 450 500 Efficiency Output Current(mA) L=47uH 3.5 3.4 Output Voltage(V) 3.3 3.2 3.1 3 2.9 2.8 2.7 0 50 100 150 200 250 300 350 400 Vin=0.9V Vin=1.0V Vin=1.5V Vin=1.8V Vin=2.0V 450 500 Output Current(mA) L=47uH 100 (%) Efficiency 90 80 Vin=0.9V 70 60 50 0 50 100 150 200 250 300 350 400 Vin=1.0V Vin=1.5V Vin=1.8V Vin=2.0V Vin=2.5V 450 500 Output Current(mA) www.belling.com.cn Ver1.1 8/10 BL8505 L=100uH 3.3 3.2 3.1 3 2.9 2.8 2 .7 0 50 100 150 200 250 300 350 400 Output Voltage(V) Vin=0.9V Vin=1.0V Vin=1.5V Vin=1.8V Vin=2.0V 450 500 Output Current(mA) L=100uH 100 90 80 Efficiency Vin=0.9V Vin=1.0V Vin=1.5V Vin=1.8V Vin=2.0V (%) 70 60 50 0 50 100 150 200 250 300 350 400 450 500 Output Current(mA) L=47uH 140 Ripple Voltage Vr(mVp-p) 120 100 80 60 40 20 0 0 50 100 150 200 250 300 350 400 Vin=0.9V Vin=1.0V Vin=1.5V Vin=1.8V Vin=2.0V 450 500 Output Current(mA) www.belling.com.cn Ver1.1 9/10 BL8505 Package Outline www.belling.com.cn Ver1.1 10/10