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GE863-QUAD
1vv0300715 Rev. 1 - 19/09/06
An example of linear regulator with 5V input is:
4.2.1.2 + 12V input Source Power Supply Design Guidelines
•The desired output for the power supply is 3.8V, hence due to the big difference between the input source and the desired output, a linear regulator is not suited and shall not be used. A switching power supply will be preferable because of its better efficiency especially with the 2A peak current load represented by the
•When using a switching regulator, a 500kHz or more switching frequency regulator is preferable because of its smaller inductor size and its faster transient response. This allows the regulator to respond quickly to the current peaks absorption.
•For car PB battery the input voltage can rise up to 15,8V and this should be kept in mind when choosing components: all components in the power supply must withstand this voltage.
•A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks, a 100μF tantalum capacitor is usually suited.
•Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at least 10V.
•For Car applications a spike protection diode should be inserted close to the power input, in order to clean the supply from spikes.
•A protection diode should be inserted close to the power input, in order to save the GE863- QUAD/PY from power polarity inversion. This can be the same diode as for spike protection.
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