www.DataSheet4U.com
BL8505
High Efficiency PFM Step-up DC/DC Converter Outline Features
Applications
Selection Guide
...
www.DataSheet4U.com
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 V...