POWERSTEP01 datasheet(34/92 Pages) STMICROELECTRONICS

34 / 92 page

Functional description

powerSTEP01

34/92

DocID025022 Rev 5

The switch input can be used by GoUntil and ReleaseSW commands as described in

Section 11.2.10 on page 78 and Section 11.2.11 on page 79.

If the SW input is not used, it should be connected to VDD.

Figure 14. External switch connection

7.15

Integrated power MOSFETs

The typical characteristics of the 8 N-channel MOSFETs integrated into the system-in-

package are listed in Table 10.

7.16

Programmable slew rate

The powerSTEP01 integrates eight programmable gate drivers which allow the output slew

rate to be fixed in a wide range of values.

The following parameters can be adjusted:

–

Gate sink/source current (IGATE)

–

controlled current time (tCC)

–

Turn-off over-boost time (tOB).

During the turn-on, the gate driver charges the gate forcing an IGATE current for all the

controlled current time period. At the end of the controlled current phase the gate of the

integrated MOSFET should be completely charged.

During the turn-off the gate driver discharges the gate sinking an IGATE current for all the

controlled current time period. At the beginning of the turn-off an overboost phase can be

added: in this case the gate driver sinks an IOB current for the programmed tOB period in

order to rapidly reach the plateau region. At the end of the controlled current time the gate of

the integrated MOSFET should be completely discharged.

AM12833v1

External

switch

Table 10. Integrated MOSFETs characteristics at Tj = 25 °C

Symbol

Parameter

Typical value

Unit

VGS(th)

Gate threshold voltage

Total gate charge at Vgs = 10 V

VSD

Source-drain diode forward on voltage at ISD = 10 A

0.8

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