Using External Clock when Low Standby Current is Required for S6BP20xA Family – KBA222986

Version Translation Japanese S6BP20xA KBA222986 Community Translated JA QuestionHow do I use external clock when low standby current is required for the S6BP20xA familyAnswerTo use external clock with the S6BP20xA familyChoose a part number MPN for the S6BP20xA family with SYNCIN function See Product Lineup in the device datasheetConnect MODE pin to GNDSet the SYNC pin to L in the system standby condition and feed external clock signal to the SYNC pin after the system wakes up PMIC will now operate in automatic PWM/PFM mode with internal clock to reduce quiescent current in system standby and in fixed PWM mode with external clock signal during system wakeupTo ensure normal operation when using external clock the internal clock frequency set by RT pin resistor RRT must be lower than the minimum of the external clock frequency Fexmin applied Choose a RRT value using the following equationRRT gt 11Fexmin 2171012

Using External Clock when Low Standby Current is R...

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Translation - Japanese: S6BP20xAファミリで低スタンバイ電流が必要な場合の外部クロックの使用 – KBA222986 - Community Translated (JA)

Question:

How do I use external clock when low standby current is required for the S6BP20xA family?

Answer:

To use external clock with the S6BP20xA family:

Choose a part number (MPN) for the S6BP20xA family with SYNC_IN function (See Product Lineup in the device datasheet).
Connect MODE pin to GND.
Set the SYNC pin to L in the system standby condition, and feed external clock signal to the SYNC pin after the system wakes up. PMIC will now operate in automatic PWM/PFM mode with internal clock to reduce quiescent current in system standby, and in fixed PWM mode with external clock signal during system wake-up.

To ensure normal operation when using external clock, the internal clock frequency set by RT pin resistor (R_RT) must be lower than the minimum of the external clock frequency (F_{ex_min}) applied. Choose a R_RT value using the following equation:

R_RT >

1.1

F_{ex_min} × 21.7×10⁻¹²

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