LT8350SAVPBF datasheet(16/36 Pages) AD

16 / 36 page

Data Sheet

LT8350S

analog.com

Rev. A

16 of 36

NAME

DESCRIPTION

VREF

Voltage Reference Output Pin. The VREF pin provides an accurate 2V reference

capable of supplying up to 2mA current. It can be used to supply resistor networks

to set the voltages at the CTRL pin. An optional bypass capacitor to GND can be

placed on this pin close to the package.

ISMON

ISP/ISN Current Monitor Output Pin. The ISMON pin generates a buffered voltage

that is equal to ten times V(ISP-ISN) plus 0.25V offset voltage. The voltage on the

ISMON pin will be 1.25V when V(ISP-ISN) is equal to 100mV full-scale.

ISP

Positive Terminal of ISP/ISN Current Sense Resistor (RIS). Ensure accurate current

sense with Kelvin connection.

ISN

Negative Terminal of ISP/ISN Current Sense Resistor (RIS). Ensure accurate current

sense with Kelvin connection.

CTRL

Control Input for ISP/ISN Current Sense Threshold. The CTRL pin is used to

program the ISP/ISN regulation current. The VCTRL can be set by an external voltage

reference or a resistor divider from VREF to ground. Connect the CTRL pin to VREF for

a 100mV full-scale threshold or force below 0.1V to stop switching. See the

Applications Information section for the Programming Input or Output Current Limit.

Voltage Loop Feedback Input. The FB pin is used for constant voltage regulation

and output fault protection. See the Applications Information section for

Programming Output Voltage and Thresholds.

Error Amplifier Output to Set Inductor Current Comparator Threshold. The VC pin

is used to compensate the control loop with an external resistor–capacitor (RC)

network. During the LOADEN low state, the VC pin is disconnected from all internal

loads to store its voltage information.

PGOOD

Power Good Open Drain Output. The PGOOD pin is pulled low when the FB pin is

within ±10% of the final regulation voltage. To function, this pin requires an

external pull-up resistor.

The SS pin is used to set a soft-start timer by connecting a capacitor to ground. An

internal 12.5µA pull-up current charging the external SS capacitor gradually ramps

up FB regulation voltage. Any UVLO or thermal shutdown immediately pulls this

pin to ground to stop switching. See the Applications Information section for Start-

Up and Fault Protection.

Switching Frequency Setting. Connect a resistor from this pin to ground to set the

internal oscillator frequency from 200kHz to 2MHz.

SYNC/MODE

External Switching Frequency Synchronization and Operation Mode Selection. This

pin allows five selectable modes for optimizing performance. See the Applications

Information section for Frequency Synchronization and Operation Mode Selection.

CLKOUT

Clock output. The CLKOUT pin provides a 50% duty cycle square wave with 180°

out of phase with the system clock. This allows synchronization with other

regulators. Float this pin if the CLKOUT function is not used.

EXTVCC

Second Input Supply for Powering INTVCC. The part intelligently chooses either VIN

or EXTVCC for INTVCC LDO to improve efficiency. Connect this pin to GND if not used.

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