BL8041
High Efficiency 1.2MHz 30V Boost
DESCRIPTION
BL8041 is a step-up converter. Its 1.23V feedback
voltage reduces power loss and improves
efficiency.
Optimized operation frequency can meet the
requirement of small LC filters value and low
operation current with high efficiency. Internal
soft start function can reduce the inrush current.
Tiny package type provides the best solution for
PCB space saving and total BOM cost.
BL8041 is available in SOT23-5 package that is PB
free.
FEATURES
2.5V to 5.5V Input Voltage
1.23V Feedback Voltage
1.2MHz Fixed Switching Frequency
Internal 0.6A Switch Current Limit
Internal Compensation
Thermal Shutdown
Available in SOT23-5 Package
APPLICATIONS
Camera Flash White LED
PDA LED back light
Digital still cameras
TYPICAL APPLICATION
Figure1. BL8041 Typical Application Circuit
ORDERING INFORMATION
BL8041
□□□
1 2 3
Code
1
2
3
MARKING INFORMATION
Product Classification
Marking
PY: Product Code
PYYW
YW: Date Code
1
Description
Temperature & Rohs:
C: -40~85°C, Pb Free Rohs Std.
Package Type:
B5: SOT-23-5
Packing Type:
TR: Tape & Reel (Standard)
BL8041CB5TR
5
4
PYYW
2
3
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BL8041
PIN DESCRIPTION
Pin No.
1
2
3
4
5
Symbol
LX
GND
FB
EN
IN
Description
Power Switch Output. LX is the drain of the internal MOSFET switch. Connect the
power inductor and output rectifier to LX. LX can swing between GND and 30V.
Ground
Feedback Input. The FB voltage is 0.25V. Connect a resistor divider to FB.
Regulator On/Off Control Input. A high input at EN turns on the converter, and a low
input turns it off. When not used, connect EN to the input supply for automatic
startup.
Power Supply. Must be locally bypassed.
ABSOLUTE MAXIMUM RATING
Parameter
IN, EN Pin Voltage
SW Pin Voltage
All Other Pin Voltage
Junction Temperature (T
J
)
Ambient Temperature (T
A
)
Power Dissipation
Thermal Resistance (θ
JA
)
Thermal Resistance (θ
JC
)
Storage Temperature (Ts)
Lead Temperature & Time
Value
-0.3V to 6V
-0.3V to 30V
-0.3V to 6V
150C
-40C to 85C
600mW
250C/W
130C/W
-65C to 150C
260C, 10Sec
SOT23-5
RECOMMENDED WORK CONDITIONS
Parameter
Input Voltage Range
Output Voltage Range
Operating Junction Temperature(Tj)
Value
2.5V to 5.5V
VIN to 30V
-40C –125C
ELECTRICAL CHARACTERISTICS
(Ta=25C, unless otherwise noted)
Symbol
V
IN
V
FB
I
FB
I
Q
F
SW
D
MAX
V
EN
I
LIMIT
Item
Operating Input Voltage
Feedback Voltage
FB input Bias Current
SW Leakage
Quiescent Current
Oscillator Frequency
Maximum Duty Cycle
EN Threshold
SW On-Resistance
Current Limit
Thermal Shutdown
Conditions
Min.
2.5
1.21
-50
Typ.
1.23
-10
0.15
0.1
1.2
90
1
400
0.6
160
Max.
5.5
1.25
1
0.3
1
Unit
V
V
nA
uA
mA
uA
MHz
%
V
mΩ
A
C
V
FB
=1V
V
SW
=20V
V
FB
=1V, Switch
V
EN
=0V
650
V
IN
=4V, Duty Cycle = 50%
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BL8041
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency Vout=5V
100%
90%
80%
70%
Efficiency(%)
Efficiency(%)
60%
50%
40%
30%
20%
10%
0%
0.001
0.01
0.1
Vin=3.6V
Vin=3.0V
Vin=2.5V
Iout (A)
1
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.001
0.01
0.1
Vin=5.0V
Vin=4.2V
Iout (A)
1
Efficiency Vout=12V
Efficiency Vout=18V
100%
90%
80%
70%
Efficiency(%)
Vout (V)
60%
50%
40%
30%
20%
10%
0%
0.001
0.01
0.1
Vin=5.0V
Iout (A)
1
5
4
3
2
1
0
0.0
6
Output Voltage vs. Output Current
Vin=3.6V
Vin=3.0V
Vin=2.5V
0.1
0.2
0.3
Iout (A)
0.4
0.5
0.6
Output Voltage vs. Output Current
14
12
10
Vout (V)
Vout (V)
8
6
4
2
0
0.0
0.1
0.2
Iout (A)
0.3
Vin=5.0V
Vin=4.2V
0.4
20
18
16
14
12
10
8
6
4
2
0
0.0
Output Voltage vs. Output Current
Vin=5.0V
0.1
0.2
Iout (A)
0.3
0.4
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BL8041
Switching Waveform
Vin=5V, Vout=12V, Iout=200mA
(CH1=Vin, CH2=Vout, CH3=LX, CH4=I
LX
)
Switching Waveform
Vin=5V, Vout=18V, Iout=150mA
(CH1=Vin, CH2=Vout, CH3=LX, CH4=I
LX
)
Load Transient Response
Vin=5V, Vout=12V, Iout=10mA-200mA
(CH2=Vout, CH4=I
LX
)
Switching waveform
Vin=5V, Vout=18V, Iout=10mA-150mA
(CH2=Vout, CH4=I
LX
)
PACKAGE INFORMATION
Package
Package Dimension:
SOT-23-5
Devices per reel
3000Pcs
Unit
mm
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