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Belling |
BL8541
0.9V startup, 1A True Shut-Off Synchronous Boost DC/DC converter
DESCRIPTION
The BL8541, is a high-efficiency, synchronous step-
up switching regulators optimized for battery-
powered applications. It supports up to 1A load
current and allows the use of small, low cost
inductors and MLCC capacitors.
The BL8541 starts up as low as 0.9V input voltage
and it has true-shutoff function (shut off output to
zero voltage when CE pulled low) and real output
short-circuit protection. These features make it
ideal for USB interface power supply.
Given its high efficiency, the BL8541 device is ideal
for small portable applications powered by battery.
It consumes as low as 40uA (3V input /3.3V output)
at zero load. And its current consumption is less
than 1uA in shutdown mode.
BL8541 is available in DFN2x2-6 package.
FEATURES
Capable of Delivering 1A
High Efficiency: Up to 92%
Compatible with MLCC capacitor
1.8MHz Switching Frequency
Low dropout 100% Duty operation
0.6V Reference for Low Output voltages
True Shutoff and Short-Circuit Protection
Logic Control Shutdown (IQ<1uA)
Thermal shutdown and UVLO
Available in DFN2x2-6
APPLICATIONS
MID / Tablet PC
Portable Power Bank
Smartphone OTG
Toy
Other portable device
TYPICAL APPLICATION
VIN
4.7uF
OFF ON
6.8uH
*Needed, when
Vout>=4.5V
1nF*
LX
VIN
VOUT
LBCL83544103
CE FB
GND
VOUT
22uF
PIN OUT & MARKING
1 CE
2 FB
3 VOUT
AL
YW
VIN 6
LX 5
GND 4
DFN2x2-6
Top View
AL: Product Code
YW: Date code (Year & Week)
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BL8541
ORDERING INFORMATION
PART No.
BL8541CKCTR
PACKAGE
DFN2x2-6
Tape&Reel
3000/Reel
ABSOLUTE MAXIMUM RATING
Parameter
Value
Max Input Voltage
5.5V
Max Operating Junction Temperature(Tj)
125C
Ambient Temperature(Ta)
-40C – 85C
Maximum Power Dissipation DFN2x2-6
800mW
Storage Temperature(Ts)
-55C - 150C
Lead Temperature & Time
260C, 10S
ESD (HBM)
>2000V
Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect
device reliability.
RECOMMENDED WORK CONDITIONS
Parameter
Input Voltage Range
Operating Junction Temperature(Tj)
Value
Max. 5V
-40C – 85C
ELECTRICAL CHARACTERISTICS
(VDD=5V, TA=25C)
Symbol
Parameter
Conditions
Min Typ Max Unit
VDD Input Voltage Range
0.9 5 V
Vstart Startup Voltage
Iout = 0 A
0.9 1.0
V
Vref Feedback Voltage
Vout = 2.5 to 5V
0.585 0.6 0.615
V
Ifb Feedback Leakage current
0.1 0.4 uA
Vout
Output Voltage Range
2.1 5 V
Iq Quiescent Current
Active, Vfb=0.7, No Switching
Shutdown
40 60 uA
1 10 uA
Irev Reverse current, Vout to Vin CE=0
5 uA
Fsoc Switching Frequency
1.8 MHz
RdsonP PMOS Rdson
150 300 mohm
RdsonN NMOS Rdson
150 300 mohm
Ilimit Peak Current Limit
1.2 1.5
2
A
Ilxlk LX Leakage Current
LX=5V, CE=0
10 uA
Icelk CE Leakage Current
1 uA
Vh_en EN Input High Voltage
0.6 V
Vl_en EN Input Low Voltage
0.3 V
TSD Thermal Shut Down
150 C
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