BELLING BL8505-271T High efficiency pfm step-up dc/dc converter Datasheet

BL8505
High Efficiency PFM Step-up DC/DC Converter
Features
Outline
Applications
Selection Guide
BL8505 XX
X
Pin Configurations
XX
package
Function description
Output voltage
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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:
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BL8505
Recommended Operating Conditions:
Min
Nom
Max
Unit
*Suggestion
Electrical Characteristics:
Symbol
Item
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Test Conditions
Min
Ver1.1
Reference Data
Typ.
Max
Unit
3/10
BL8505
Typical Characteristics
Detailed Description:
Selection Of The External Components:
D
1
Vout Vin
Vout
Inductor Selection
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BL8505
2
L min
D(1 D) RL
2f
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
r' r
3
D
Rload Cf
Im ax RESR
Vout
Diode Selection
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BL8505
4
Input Capacitor
Test Circuits
3
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BL8505
Typical Characteristics
L=10uH
Output Voltage(V)
3.5
Vin=0.9V
3.4
Vin=1.0V
3.3
Vin=1.5V
Vin=1.8V
3.2
Vin=2.0V
3.1
3
2.9
2.8
2.7
0
50
100
150
200
250
300
350
400
450
500
Output Current(mA)
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BL8505
L=10uH
Efficiency
(%)
100
90
80
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
3.5
Vin=0.9V
Vin=1.0V
Vin=1.5V
Vin=1.8V
Vin=2.0V
Output Voltage(V)
3.4
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)
L=47uH
(%)
90
Efficiency
100
80
Vin=0.9V
Vin=1.0V
70
Vin=1.5V
Vin=1.8V
60
Vin=2.0V
Vin=2.5V
50
0
50
100
150
200
250
300
350
400
450
500
Output Current(mA)
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BL8505
L=100uH
Output Voltage(V)
3.3
Vin=0.9V
Vin=1.0V
Vin=1.5V
Vin=1.8V
Vin=2.0V
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)
L=100uH
(%)
100
Vin=0.9V
Vin=1.0V
Vin=1.5V
Vin=1.8V
Vin=2.0V
90
Efficiency
80
70
60
50
0
50
100
150
200
250
300
350
400
450
500
Output Current(mA)
L=47uH
Ripple Voltage Vr(mVp-p)
140
120
100
80
Vin=0.9V
60
Vin=1.0V
40
Vin=1.5V
20
Vin=1.8V
Vin=2.0V
0
0
50
100
150
200
250
300
350
400
450
500
Output Current(mA)
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Ver1.1
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BL8505
Package Outline
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Ver1.1
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