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PDF BL8541 Data sheet ( Hoja de datos )
| Número de pieza | BL8541 | |
| Descripción | 1A True Shut-Off Synchronous Boost DC/DC converter | |
| Fabricantes | Belling | |
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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)
www.belling.com.cn
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1 page  
BL8541
DETAILED DESCRIPTION
General description
The BL8541 is a high-efficiency, Boost DC/DC converter, with input current limit at 1.5A. It integrates an
150mΩ high side MOSFET and an 150 mΩ low side MOSFET. It employs PWM/PFM auto-switch control mode.
Short circuit protection
BL8541 employs a “Hiccup” mode of short-circuit protection, which enables output voltage auto recover
when short-circuit is removed.
True shut off function
BL8541 offers a true shut off function, which means it can really shut off output (make output voltage to zero)
when CE is pull low (chip turns off). Normally, there is a schottky diode (or MOSFET body diode) existed
between LX and Vout for a normal boost converter, and thus, when CE is pull low, though the chip is turned
off, the Vin is connected to Vout thru inductor and schottky diode. So we still can detect a voltage at Vout
terminal. BL8541, with its proprietary design skill, can truly shut down the output when chip is turned off.
Design Procedure
Setting Output Voltages
Output voltages are set by external resistors. The FB_ threshold is 0.6V.
RTOP = RBOTTOM[(VOUT / 0.6) - 1]
Capacitor Selection
A 22uF ceramic capacitor is demanded on output terminal, while 4.7uF is good enough for input.
Higher values, lower cost ceramic capacitors are now becoming available in smaller case sizes. Their high
ripple current, high voltage rating and low ESR make them ideal for switching regulator applications. Using
ceramic capacitors can achieve very low output ripple and small circuit size. When choosing the input and
output ceramic capacitors, choose the X5R or X7R dielectric formulations. These dielectrics have the best
temperature and voltage characteristics of all the ceramics for a given value and size.
Application Information
Layout is critical to achieve clean and stable operation. The switching power stage requires particular
attention. Follow these guidelines for good PC board layout:
1) Place 22uF output capacitors as close to the IC VOUT and GND pins as possible
2) Connect input and output capacitors to the same power ground node with a star ground configuration
then to IC ground.
3) Keep the high-current paths as short and wide as possible. Keep the path of switching current short.
Avoid vias in the switching paths.
4) If possible, connect VIN, LX, and GND separately to a large copper area to help cool the IC to further
improve efficiency and long-term reliability.
5) Ensure all feedback connections are short and direct. Place the feedback resistors as close to the IC as
possible.
6) Route high-speed switching nodes away from sensitive analog areas
www.belling.com.cn
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5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet BL8541.PDF ] | |
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