BL8505-302RM中文资料

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High Efficiency PFM Step-up DC/DC Converter
BL8505
Selection Guide
BL8505XX X XX

Outline
Features
Applications
Function description
Output voltage

package
Pin Configurations

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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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Recommended Operating Conditions:
Min Nom Max Unit

*Suggestion
Electrical Characteristics:
Reference Data
Symbol Item Test Conditions Min Typ. Max Unit

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Typical Characteristics

Detailed Description:

Selection Of The External Components:
Vout
VinVout
D

1Inductor Selection

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BL8505
fRDDLL2
)1(
min
2

Lmin
Lf
VinD
I

LfDVinRDVinaxL2
)1(

Im
2

2
)1(DR

r

load
L

2Capacitor Selection
CfRDVout
Vout
r

load

Vout
RaxrrESRIm
'

3Diode Selection

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4Input Capacitor

Test Circuits

3

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Typical Characteristics
2.7
2.8
2.9
3
3.1
3.2
3.3
3.4
3.5

050100150200250300350400450500
Output Current(mA)

O
u
t
p
u
t
V
o
l
t
a
g
e
(
V
)
Vin=0.9V
Vin=1.0V
Vin=1.5V
Vin=1.8V
Vin=2.0V

L=10uH

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BL8505
L=47uH
50
60
70
80
90
100

050100150200250300350400450500
Output Current(mA)

E
f
f
i
c
i
e
n
c
y
(
%
)
Vin=0.9V
Vin=1.0V
Vin=1.5V
Vin=1.8V
Vin=2.0V

2.7
2.8
2.9
3
3.1
3.2
3.3
3.4
3.5
050100150200250300350400450500
Output Current(mA)

O
u
t
p
u
t
V
o
l
t
a
g
e
(
V
)
Vin=0.9V
Vin=1.0V
Vin=1.5V
Vin=1.8V
Vin=2.0V

50
60
70
80
90
100
050100150200250300350400450500
Output Current(mA)

E
f
f
i
c
i
e
n
c
y
(
%
)
Vin=0.9V
Vin=1.0V
Vin=1.5V
Vin=1.8V
Vin=2.0V
Vin=2.5V

L=10uH
L=47uH

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BL8505
L=100uH

L=100uH
L=47uH

2.7
2.8
2.9
3
3.13.23.3050100150200250300350400450500Output Current(mA)Output Voltage(V)Vin=0.9VVin=1.0VVin=1.5VVin=1.8V
Vin=2.0V

50
60
70
80
90
100
050100150200250300350400450500
Output Current(mA)

E
f
f
i
c
i
e
n
c
y
(
%
)
Vin=0.9V
Vin=1.0V
Vin=1.5V
Vin=1.8V
Vin=2.0V

0
20
40
60
80
100
120
140
050100150200250300350400450500
Output Current(mA)

R
i
p
p
l
e
V
o
l
t
a
g
e
V
r
(
m
V
p
-
p
)
Vin=0.9V
Vin=1.0V
Vin=1.5V
Vin=1.8V
Vin=2.0V

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Package Outline

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