PIN DESCRIPTION (Pin numering referred to PowerSO20 package).

No

Pins

Function

Positive supply voltage.

Switch driver supply.

order to use the built-in charge pump, connect a filter capacitor from pin1 to pin.

The suggested value assures a fast transition and a low supply ripple even in worse

condition. Using the four channels contemporarily, values less than 68nF have to be

avoided.

2, 3,

8, 9

High side outputs.

Four independently controlled outputs with built-in current limitation.

1, 10,

11, 20

GND

Ground and power dissipating pins.

These pins are connected to the bulk ground of the IC, so are useful for heat dissipation.

12,13,

14, 15

Control inputs.

Four independent control signals. The output is held off until the voltage at the

corresponding input pin reaches 1.35V and is turned off when the voltage at the pin goes

below 1.15V.

16

ON DELAY

Programmable ON duration in short circuit.

If an output is short circuited to ground or carryng a current exceeding the limit, the output

is turned-off and the diagnostic activation are delayed. This procedure allows the driving

of hard surge current loads.

The delay is programmed connecting a capacitor (50pF to 15nF) versus ground with the

internal time constant of 1.28

µs/pF. The function can be disabled short circuiting this pin

to ground.

17

OFF DELAY

Programmable OFF duration in short circuit.

After the short circuit or overcurrent detection, the switch is held off before the next

attempt to switch on again.

The delay is programmed connecting a capacitor (50pF to 15nF) versus ground with the

internal time constant of 1.28

µs/pF.

Short circuiting this pin to ground the OFF delay is 64 times the ON delay.

18

R

Asyncronous reset input.

This active low input (with hysteresis), switch off all the outputs independently from the

input signal. By default it is biased low.

19

DIAG

Diagnostic output.

This open drain output reports the IC working condition. The bad condition (as

undervoltage, overcurrent, overtemperature) turns the output low.

Pump oscillator voltage.

At this pin is available the built-in circuitry to supply the switch driver at about 10V higher

The suggested value assures a fast transition and a minimum output drop voltage even in

worse condition. Using the four channels contemporarily, values less than 6.8nF have to

be avoided.

Bootstrapped voltage.

At this pin is available the 11V oscillation for the charge pump, at a typical frequency of

200kHz.

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