MB39C308 Datasheet, PDF (53/60 Pages) Fujitsu Component Limited. – 6ch DC/DC Converter IC for LPIA Platform VR

MB39C308
■ USAGE PRECAUTION
1. Do not configure the IC over the maximum ratings
lf the lC is used over the maximum ratings, the LSl may be permanently damaged.
It is preferable for the device to normally operate within the recommended usage conditions. Usage outside of
these conditions can have a bad effect on the reliability of the LSI.
2. Use the devices within recommended operating conditions
The recommended operating conditions are under which the LSl is guaranteed to operate.
The electrical ratings are guaranteed when the device is used within the recommended operating conditions
and under the conditions stated for each item.
3. Printed circuit board ground lines should be set up with consideration for common
impedance
4. Take appropriate measures against static electricity
• Containers for semiconductor materials should have anti-static protection or be made of conductive material.
• After mounting, printed circuit boards should be stored and shipped in conductive bags or containers.
• Work platforms, tools, and instruments should be properly grounded.
• Working personnel should be grounded with resistance of 250 kΩ to 1 MΩ between body and ground.
5. Do not apply negative voltages
The use of negative voltages below –0.3 V may create parasitic transistors on LSI lines, which can cause
malfunctions.
6. Warnings when connecting the load
During DC/DC operation, if the output is connected by hard switching to a capacitance that greatly exceeds the
DC/DC output capacitance, the output voltage may oscillate and the protection function may be detected due
to the instant voltage drop. Take note of the following points.
• Connecting to the load capacitor
A P-ch FET is normally used as a load switch, and a gate resistor is inserted as shown below for the switch to
turn on gradually and to prevent rush current.
VO
Load
Capacitor
Load switch
DS04-27261-6E
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