PM6686 STMicroelectronics, PM6686 Datasheet - Page 7

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

PM6686
2
2.1
2.2
Pin settings
Connections
Figure 2.
Pin descriptions
Table 2.
N°
1
2
3
4
5
6
EN_LDO
VREF2
VREF3
TON
VCC
VIN
Pin
Pin connection (through top view)
Pin descriptions
Internal 2 V high accuracy voltage reference. It can deliver 50 μA. Loading
VREF2 can affect FB and output accuracy. Bypass to GND with a 100 nF
capacitor.
Frequency selection pin. It provides a selectable switching frequency,
allowing three different values of switching frequencies for the switching
sections.
Controller supply voltage input. Bypass to GND with a 1 μF capacitor.
Enable input for the linear regulator. The LDO is enabled if
EN_LDO is > 1.6 V and is disabled if EN_LDO < 1 V.
Internal 3.3 V high accuracy voltage reference. It can deliver 5 mA if
bypassed to GND with a 10 nF capacitor. If not used, it can be left floating.
Device supply voltage pin. VIN is used in the on-time generators of the two
switching controllers. VIN is also used to power the linear regulator when the
switchover function is not active. Connect VIN to the battery input and
bypass with a 1 µF capacitor.
Doc ID 15281 Rev 4
Function
Pin settings
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