L9924TR datasheet(29/85 Pages) STMICROELECTRONICS

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DocID029638 Rev 2

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L9924

Electrical specifications

5.3.9

Pin "GATE"

The external power MOS provides a PWM regulated current to flow from the system battery

into the field coil for system voltage regulation. The GATE pin provides the necessary

current to turn-on and turn-off the external power MOS.

The gate-source-voltage of the external power MOS is limited by the driver circuit.

In order to drive different kinds of external power MOS and to adjust the gate currents

according to environmental changes (e.g. temperature, emission levels, excitation signal

edges duration) the gate charging and discharging currents are programmable via SPI,

When the voltage between DRAIN an SOURCE pins become greater than VSCdx the device

switches the external power MOS off, activating a fast gate discharging current.

Table 19. Electrical characteristics pin "GATE"

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

Drivers for external high/low side power MOS

1IGHx(on)

Turn on current

(SOURCE stage)

Tj = 25 °C

0 -> -11.55,

-1.65 steps

-mA

1IGHx(off)

Turn off current

(SINK stage)

Tj = 25 °C

0 -> +11.55,

+1.65 steps

-mA

9VGHxH

High level voltage

V(A+/B+) = 6 V

V(SOURCE)

+7V

V(A+/B+) = 12 V

V(SOURCE)

+11

VSOURCE

+13

V(A+/B+) = 24 V

V(SOURCE)

+11

VSOURCE

+13

RGSHx

Gate-source passive

discharge resistance

100

kΩ

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