PM6675STR datasheet(35/53 Pages) STMICROELECTRONICS

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PM6675S

Device description

35/53

7.1.12

Device thermal protection

The internal control circuitry of the PM6675S self-monitors the junction temperature and

turns all outputs off when the 150 °C limit has been overrun. This event causes the switching

section to be immediately disabled and both switches to be opened. The controller performs

a soft-end and both the outputs are eventually kept to ground, then the low side MOSFET is

turned on when the voltage of the switching section is lower than 400 mV.

The thermal fault is a latched protection and, in normal operating conditions it is restored by

a Power-On Reset or toggling SWEN and LEN pins at the same time.

7.2

LDO linear regulator section

The independent Low-Drop-Out (LDO) linear regulator has been designed to sink and

source up to 2 A peak current and 1 A continuously. The LDO output voltage can be

adjusted in the range 0.6 V to 3.3 V simply connecting a resistor divider as shown in

Figure 44

Equation 23

Figure 44.

LDO output voltage selection

Table 9.

Switching section OV, UV and OT Faults management

Fault

Conditions

Action

Over voltage

VOUT > 115 % of the

nominal value

LGATE pin is forced high and the device latches off.

Exit by a Power-On Reset or toggling SWEN

Under voltage

VOUT < 70 % of the

nominal value

LGATE pin is forced high after the soft-end, then the

device latches off. Exit by a Power-On Reset or

toggling SWEN.

Junction over

temperature

TJ > +150 °C

LGATE pin is forced high after the soft-end, then the

device latches off. Exit by a Power-On Reset or

toggling SWEN and LEN after 15°C temperature

drop.

VLDOADJ

⋅

PM6675

LFB

LOUT

R19

R20

VLOUT

LGND

COUT

PM6675S

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