S-8520A20MC-AVFT2X Datasheet, PDF (22/44 Pages) Seiko Instruments Inc – SWITCHING REGULATOR CONTROLLER

STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series
Rev.9.0_01
 Precautions
• Mount the external capacitors, the diode and the coil as close as possible to the IC, and secure grounding at a
single location.
• 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 coil, the capacitor and
impedance of power supply used, fully check them using an actually mounted model.
• The overload protection circuit of this IC performs the protective function by detecting the maximum duty time
(100 %). In choosing the components, make sure that over currents generated by short-circuits in the load, etc.,
will not surpass the allowable dissipation of the switching transistor and inductor.
• Make sure that dissipation of the switching transistor (especially at a high temperature) does not exceed the
allowable dissipation of the package.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
• SII Semiconductor Corporation claims no responsibility for any and all disputes arising out of or in connection with
any infringement by products including this IC of patents owned by a third party.
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