link to page 10 link to page 10 LTM4643 PIN FUNCTIONS COMP1, COMP2, COMP3, COMP4 (B7, E7, H7, L7): Cur- SGND (F7): Signal Ground Connection. SGND is connected rent Control Threshold and Error Amplifier Compensation to GND internally through single point. Use a separated Point of Each Switching Mode Regulator Channel. The SGND ground copper area for the ground of the feedback internal current comparator threshold is proportional to resistor and other components connected to signal pins. this voltage. Tie the COMP pins together for parallel opera- A second connection between the PGND plane and SGND tion. The device is internally compensated. plane is recommended on the backside of the PCB under- CLKIN (C7): External Synchronization Input to Phase neath the module. Detector of the Module. This pin is internally terminated TEMP (F3): Onboard Temperature Diode for Monitoring to SGND with 20kΩ. The phase-locked loop will force the VBE Junction Voltage Change with Temperature. See the channel 1 turn-on signal to be synchronized with the the Applications Information section. 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. Rev D For more information www.analog.com 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photo Related Parts
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