LTM8045 datasheet(2/54 Pages) AD

2 / 54 page

LTM4655

Rev. 0

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Features..................................................... 1

Applications ................................................ 1

Typical Application ........................................ 1

Description.................................................. 1

Absolute Maximum Ratings.............................. 3

Pin Configuration .......................................... 3

Order Information.......................................... 4

Electrical Characteristics................................. 4

Typical Performance Characteristics ..................10

Pin Functions ..............................................14

Simplified Block Diagram ...............................21

Test Circuit.................................................22

Decoupling Requirements...............................23

Operation...................................................24

Power Module Overview......................................... 24

VIN to VOUT Conversion Ratios................................25

Input Capacitors, Positive-VOUT Operation .............25

Output Capacitors, Positive-VOUT Operation...........26

Forced Continuous Operation .................................26

Output Voltage Programming, Tracking and

Soft-Start................................................................26

Frequency Adjustment ............................................27

Applications Information ................................28

Power Module Protection .......................................28

RUN Pin Enable.......................................................28

Loop Compensation................................................28

Hot Plugging Safely ................................................29

Input Disconnect/Input Short Considerations.........29

INTVCCn and EXTVCCn Connection.........................29

Multiphase Operation..............................................30

Negative Output Current Capability Varies as a

Function of VINn to VOUTn– Conversion Ratios,

Negative-VOUT– Operation.......................................31

Input Capacitors, Negative-VOUT– Operation...........32

Output Capacitors, Negative-VOUT– Operation ........33

Optional Diodes to Guard Against Overstress,

Negative-VOUT– Operation.......................................33

Frequency Adjustment, Negative-VOUT– Operation .34

Radiated EMI Noise ................................................35

Thermal Considerations and Output Current

Derating..................................................................35

Safety Considerations.............................................46

Layout Checklist/Example ......................................46

Typical Applications ......................................49

Package Description .....................................52

Package Photograph .....................................54

Design Resources ........................................54

Related Parts ..............................................54

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