LTM8045 datasheet(7/36 Pages) LINER

7 / 36 page

LTM4644/LTM4644-1

4644fe

For more information www.linear.com/LTM4644

PIN FUNCTIONS

COMP1, COMP2, COMP3, COMP4 (B7, E7, H7, L7): Cur-

rent Control Threshold and Error Amplifier Compensation

Point of Each Switching Mode Regulator Channel. The

internal current comparator threshold is proportional to

this voltage. Tie the COMP pins together for parallel opera-

tion. The device is internally compensated.

CLKIN (C7): External Synchronization Input to Phase

Detector of the Module. This pin is internally terminated

to SGND with 20kΩ. The phase-locked loop will force

the channel 1 turn-on signal to be synchronized with the

rising edge of the CLKIN signal. Channel 2, channel 3 and

channel 4 will also be synchronized with the rising edge of

the CLKIN signal with a pre-determined phase shift. See

the Applications Information section for details.

SGND(F7):SignalGroundConnection.SGNDisconnected

to GND internally through single point. Use a separated

SGND ground copper area for the ground of the feedback

resistor and other components connected to signal pins.

A second connection between the PGND plane and SGND

plane is recommended on the backside of the PCB under-

neath the module.

TEMP (F3): Onboard Temperature Diode for Monitoring

the VBE Junction Voltage Change with Temperature. See

the Applications Information section.

LTM8045 Datasheet(PDF) 7 Page - Linear Technology