A6984 datasheet(33/47 Pages) STMICROELECTRONICS

Part #	A6984

Description	36 V, 400 mA automotive synchronous step-down switching regulator

PDF	47 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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A6984

Device description

4.8

PGOOD

The internal circuitry monitors the regulated output voltage and keeps the PGOOD open

collector output in low impedance as long as the feedback voltage is below the VPGD L

threshold (see Table 5 on page 7).

Figure 26. PGOOD behavior during soft-start time with electronic load

The PGOOD is driven low impedance if VFB = VCC (internal voltage divider, see Section 4.1

on page 13) and VBIAS > VPGD H threshold (see Table 5).

The VPGD H threshold has no effect on PGOOD behavior in case the external voltage divider

is being used.

4.9

Overvoltage protection

The overvoltage protection monitors the FB pin and enables the low-side MOSFET to

discharge the output capacitor if the output voltage is 20% over the nominal value. A new

soft-start takes place after the OVP event ends.

A6984 Datasheet(PDF) 33 Page - STMicroelectronics