STPM066S datasheet(17/67 Pages) STMICROELECTRONICS

17 / 67 page

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The device can be moved to STANDBY mode, applying a voltage below VWAKE_OFF threshold, with a

minimum pulse width of tWAKE_FILTER.

4.2.7

Synchronizing pin (SYNC in/out)

The user can provide an external clock on SYNCIN pin (higher than 1.8 MHz) in order to change the switching

frequency of the internal regulators (Buck and Boost).

In case an external clock is not provided, SYNCIN can be left floating (with inner pull-down resistor). All regulators

work at their default switching frequency or, for the Buck, the frequency selected by OTP.

When a clock at fsyncin frequency is provided on SYNCIN pin:

•

Boost works at fsyncin if fsyncin>1.8 MHz or 2.4 MHz (default switching frequency) if fsyncin<1.2 MHz.

•

When the frequency of the Buck is set to 2.4 MHz by OTP, the Buck works at fsyncin if fsyncin>1.8 MHz or

2.4 MHz (default switching frequency) if fsyncin<1.2 MHz.

•

When frequency of the Buck is set to 400 kHz by OTP, the Buck works at fsyncin/6 if fsyncin>1.8 MHz or

400 kHz (default switching frequency) if fsyncin<1.2 MHz.

Figure 4. SYNC IN/OUT in Active mode

Frequency

processors

Frequency

detection

2.4 MHz

in PLL out

Oscillator

Clock for

buck & boost

Control

logic

Smitter

SYNCIN pin

SYNCOUT pin

MUX

SYNCIN/OUT function in ACTIVE mode

Buffer

Reference frequency

GADG1105180837PS

STPM066S

Voltage regulators and features description

DS12976 - Rev 2

page 17/67

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