LT3756 datasheet(11/31 Pages) AD

11 / 31 page

LT8355-1

Rev. A

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PIN FUNCTIONS

VREF (Pin 14): A 2V (Typical) Reference Voltage. It can

supply a maximum of 2.5mA at room temperature, useful

for resistor networks that set voltages across CTRL1,2;

IADJ2; and PWM1,2 pins. The output is stable without

a local bypass but, if needed, bypass this pin to ground

with a 1µF capacitor. If no load is connected or unused,

leave pin floating.

EN/UVLO (Pin 15): When the voltage at this pin falls below

1.25V (typical), switching stops and the part shuts down.

A hysteresis of approximately 60mV is included when

returning over 1.25V. Drive this pin high with a logic level

greater than 1.4V or low with a logic level below 0.3V for

simple ON/OFF functionality or tie it through a resistive

voltage divider to VIN for a precise input undervoltage

shutdown threshold. For all uses of this pin, ensure that

the minimum Thevenin equivalent resistance is 20k.

VIN (Pin 16): Input Supply Pin. Must be locally bypassed.

INTVCC (Pin 22): Voltage Supply Used by Internal Circuits.

Tie a capacitor from this pin to ground. It requires a min-

imum capacitance of 2.2µF; but considering temperature

and voltage coefficients, 4.7µF is recommended. The typ-

ical INTVCC voltage is 7.5V, and a 16V rated capacitor will

usually be appropriate. This pin is not intended for use

as a power source for external loads and connecting it to

certain external loads may interfere with operation of the

device. Using the INTVCC pin for any purpose other than

those described in the Applications Information section

is not recommended.

SENSEN1, SENSEN2 (Pins 26, 25): Kelvin connect this

pin to the negative side of the switch current sense resis-

tor for each channel. For more information about this, see

the PCB layout guidelines in the Applications Information

section.

SENSEP1, SENSEP2 (Pins 27, 24): Kelvin connect this pin

to the positive side of the grounded switch current sense

resistor for each channel. For more information about

this, see the PCB layout guidelines in the Applications

Information section.

GATE1, GATE2 (Pins 28, 23): External NMOS Power

Switch Gate Driver for Each Channel. Connect this pin to

the gate of an NMOS whose source is connected to the

switch current sense resistor.

GND (Pin 29 Exposed Pad): Ground. Solder the exposed

pad directly to the ground plane.

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