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BL8083 Datasheet(PDF) 8 Page - SHANGHAI BELLING CO., LTD.

Part No. BL8083
Description  PMU with a Synchronous 18V 2A Buck and a CMOS 6V 1.5A LDO
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Maker  BELLING [SHANGHAI BELLING CO., LTD.]
Homepage  http://www.belling.com.cn
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BL8083 Datasheet(HTML) 8 Page - SHANGHAI BELLING CO., LTD.

   
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BL8083
Selecting the Inductor
A 4.7μH to 22μH inductor with a DC current rating
of at least 25% percent higher than the maximum
load current is recommended for most applications.
For highest efficiency, the inductor DC resistance
should be less than 15mΩ.
Selecting the Capacitor
The input and output capacitors are required to
maintain the DC output voltage. Ceramic, tantalum,
or low ESR electrolytic capacitors are recommended.
Low ESR capacitors are preferred to keep the
output voltage ripple low.
THERMAL CONSIDERATIONS
Thermal consideration has to be taken into account
to ensure proper function of the device. Power
dissipation of BL8083 can be calculated as:
PT: Total Power Dissipation, PL: LDO Power
Dissipation, PB: BUCK Power Dissipation
For proper function and safe operation of the
device, total power dissipation is recommended to
be limited within 2W. Due to the overall power
consumption and heat of the chip, the individual
pathway may not reach the maximum current due
to temperature protection.
PC BOARD LAYOUT
PCB layout is very important to achieve stable
operation. For best results, use the following
guidelines and figures as reference.
1) Keep the connection between the input
ground and GND pin as short and wide as
possible.
2) Keep the connection between the input
capacitor and VIN pin as short and wide as
possible.
3) Use short and direct feedback connections.
Place the feedback resistors and compensation
components as close to the chip as possible.
4) Route SW away from sensitive analog areas
such as FB and LGND.


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