PM6686 datasheet(37/50 Pages) STMICROELECTRONICS

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PM6686

Monitoring and protections

Doc ID 15281 Rev 4

37/50

The minimum voltage of the charge pump is:

Equation 7

Where VCP_FB is the minimum voltage of CP_FB pin(2V typ.).

In case the charge pump feedback is not used, leave the CP_FB pin floating or connect the

pin to VCC.

9.6

Voltage references

The PM6686 provides two voltage references.

The device regulates a 3,3 V voltage reference (VREF3) with ±2% accuracy over

temperature. VREF3 can source up to 5 mA. VREF3 voltage is always available if VIN is

applied. The device allows the enabling of the outputs if VREF3 is above 2,8V typ. and turns

off when VREF3 falls under 2,7 V typ.

VREF2 is a + 2 V reference with an accuracy of ±1% over temperature. It can source up to

50 µA typ. and sink up to 10 µA. VREF2is adopted as internal reference; this voltage can be

used as voltage threshold to set configuration pins (e.g. TON, SKIP pins). VREF2 is enabled

when one enable pin (EN1, EN2 or EN_LDO) is pulled high.

9.7

General device fault management

9.7.1

Thermal protection

If the internal temperature of the device exceeds typically +150 °C, the controller shuts down

immediately all the internal circuitry. Switching sections performs the soft-end management.

Toggling EN, EN LDO or cycling VIN resets the latched fault.

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