PM6686 datasheet(7/50 Pages) STMICROELECTRONICS

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PM6686

Pin settings

Doc ID 15281 Rev 4

7/50

Pin settings

2.1

Connections

Figure 2.

Pin connection (through top view)

2.2

Pin descriptions

Table 2.

Pin descriptions

N°

Function

1VREF2

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.

2TON

Frequency selection pin. It provides a selectable switching frequency,

allowing three different values of switching frequencies for the switching

sections.

VCC

Controller supply voltage input. Bypass to GND with a 1

μF capacitor.

4EN_LDO

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.

5VREF3

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.

6VIN

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.

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