PM6686 STMicroelectronics, PM6686 Datasheet - Page 43

• Manufacturer Part Number: PM6686
• Description: Dual Step-down Controller With Adjustable Voltages, Adjustable Ldo And Auxiliary Charge Pump Controller For Notebook
• Manufacturer: STMicroelectronics

PM6686
11.3
11.3.1
11.3.2
Other important components
VIN filter
A VIN pin low pass filter is suggested to reduce switching noise. The low pass filter is shown
in the next figure:
Figure 55. VIN pin filter
Typical component value is: C = 1 µF.
PVCC and VCC
PVCC and VCC are connected with an internal resistor (about 10 Ω); this allows reducing
the external components. Connect the +5 V supply rail only to PVCC.
Use a bypass capacitor on PVCC pin. A VCC low pass filter helps to reject switching
commutations noise, this filter can be implemented simply adding a bypass capacitor on
VCC pin.
Figure 56. VCC and PVCC filters
Voltage
Input
Doc ID 15281 Rev 4
C2
C1
C
VCC
PVCC
VIN
Diode selection
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