PM6686 datasheet(35/50 Pages) STMICROELECTRONICS

35 / 50 page

PM6686

Monitoring and protections

Doc ID 15281 Rev 4

35/50

9.4

Linear regulator section

The PM6686 has an integrated linear regulator (LDO) that can provide an average of

100 mA typ. with a peak current of 270 mA typ. The LDO can be enabled using EN_LDO

pin. If VIN is applied the linear regulator is active even if PVCC is low.

The output voltage can be programmed by LDOREFIN pin. If LDOREFIN pin is tied to

ground (GND) the LDO provides a +5 V output voltage. If it is connected to VREF3 pin the

LDO regulates 3.3 V. If the voltage at the LDOREFIN pin is between 0.35 V and 2.25 V the

LDO generates an output voltage equals to 2xVLDOREFIN.

The controller provides a switchover function when LDOREFIN pin is connected to VCC or

GND. If the voltage at LDO_SW pin is high enough, the internal linear regulator is turned off

and the LDO pin is connected with an internal MOSFET to the LDO_SW pin. This feature

decreases the power dissipation of the device.

When the switchover function is used the maximum current capability is 200 mA if LDO

output is +5 V and 100 mA if the LDO output is +3.3 V.

Table 12.

LDO output voltage configuration

LDOREFIN voltage

LDO voltage

GND

+5 V

VREF3

+3,3 V

0,35 V < VLDOREFIN < 2,25 V

2x VLDOREFIN

Table 13.

LDO switchover management

VLDOREFIN

VBYPLDO_SW

VLDO

Internal LDO

Switchover

resistance

< 0,35 V

> 4,75 V

+5 V

Disabled

0.81

< 0,35 V

< 4,55 V

+5 V

Enabled

> 2.43 V

> 3.18 V

+3,3 V

Disabled

1.12

> 2.43 V

< 3.05 V

+3,3 V

Enabled

0,35 V < VLDOREFIN < 2,25 V

2x VLDOREFIN

Enabled

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