7/33

L6919E

17

OSC/INH

FAULT

Oscillator pin.

It allows programming the switching frequency of each channel: the equivalent switching

frequency at the load side results in being doubled.

Internally fixed at 1.24V, the frequency is varied proportionally to the current sunk (forced) from

(into) the pin with an internal gain of 6kHz/

µA (See relevant section for details). If the pin is not

connected, the switching frequency is 150kHz for each channel (300kHz on the load).

The pin is forced high (5V Typ.) when an Over/Under Voltage is detected; to recover from this

condition, cycle VCC.

Forcing the pin to a voltage lower than 0.6V, the device stop operation and enter the inhibit

state.

18-22

VID4-0

Voltage IDentification pins.

Internally pulled-up, connect to GND to program a ‘0’ while leave floating to program a ‘1’.

They are used to program the output voltage as specified in Table 1 and to set the PGOOD,

OVP and UVP thresholds.

The device automatically regulates 25mV higher than the HAMMER DAC avoiding the use of

any external set-up resistor.

23

PGOOD

This pin is an open collector output and is pulled low if the output voltage is not within the above

specified thresholds and during soft start. It cannot be pulled-up above 5V.

If not used may be left floating.

24

BOOT2

Channel 2 HS driver supply. This pin supplies the relative high side driver.

Connect through a capacitor (100nF typ.) to the PHASE2 pin and through a diode to VCC

(cathode vs. boot).

25

UGATE2

Channel 2 HS driver output.

A little series resistor helps in reducing device-dissipated power.

26

PHASE2

Channel 2 HS driver return path. It must be connected to the HS2 mosfet source and provides

the return path for the HS driver of channel 2.

27

LGATE2

Channel 2 LS driver output.

A little series resistor helps in reducing device-dissipated power.

28

PGND

LS drivers return path.

This pin is common to both sections and it must be connected through the closest path to the

LS mosfets source pins in order to reduce the noise injection into the device.

PIN FUNCTION (continued)

N

Name

Description