S-8550AA-M5T1X Datasheet, PDF (15/31 Pages) Seiko Instruments Inc – RECTIFICATION, PWM CONTROL SWITCHING REGULATORS

STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
Rev.5.0_01
S-8550 Series
 Precaution
• Mount external capacitors, diodes, and inductors as close as possible to the IC, and make a one-point grounding.
• Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover rush current
flows at the time of a power supply injection. Because these largely depend on the inductor, the capacitor and
impedance of power supply used, fully check them using an actually mounted model.
• The 1.0 μF capacitance connected between the VIN and VSS pins is a bypass capacitor. It stabilizes the power
supply in the IC when application is used with a heavy load, and thus effectively works for stable switching
regulator operation. Allocate the bypass capacitor as close to the IC as possible, prioritized over other parts.
• Although the IC contains a static electricity protection circuit, static electricity or voltage that exceeds the limit of
the protection circuit should not be applied.
• The power dissipation of the IC greatly varies depending on the size and material of the board to be connected.
Perform sufficient evaluation using an actual application before designing.
• SII Semiconductor Corporation assumes no responsibility for the way in which this IC is used on products created
using this IC or for the specifications of that product, nor does SII Semiconductor Corporation assume any
responsibility for any infringement of patents or copyrights by products that include this IC either in Japan or in
other countries.
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