UCC2921DTR ,Latchable Negative Floating Single, Hot-Swap IC Industrial Temp.ELECTRICAL CHARACTERISTICS Unless otherwise specified, T = 0°C to 70°C for the UCC3921 and –40°C to ..
UCC2921DTR ,Latchable Negative Floating Single, Hot-Swap IC Industrial Temp.MAXIMUM RATINGSIVDD...... 50mADIL-8 , SOIC-8 (Top View)SDFLTCH Current ... 10mANorJ,DPackagesPL Cur ..
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UCC2921-UCC2921D-UCC2921DG4-UCC2921DTR
Latchable Negative Floating Single, Hot-Swap IC Industrial Temp.
FEATURES Precision Fault Threshold Programmable:
Average Power Limiting, Linear
Current Control, Overcurrent Limit
and Fault Time Fault Output Indication Signal Automatic Retry Modeor Latched
Operation Mode Shutdown Control Undervoltage Lockout 250μs Glitch Filteron the SDFLTCH
pin 8-Pin DIL and SOIC
Latchable Negative Floating Hot Swap Power Manager
BLOCK DIAGRAM
UCC1921
UCC2921
UCC3921
DESCRIPTIONThe UCC3921 familyof negative floating hot swap power managers pro-
vides complete power management, hot swap, and fault handling capa-
bility. TheICis referencedto the negative input voltage andis powered
throughan external resistor connectedto ground, whichis essentiallya
current drive as opposedto the traditional voltage drive. The onboard
10V shunt regulator protects theIC from excess voltage and servesasa
reference for programming the maximum allowable output sourcing cur-
rent duringa fault.All control and housekeeping functions are integrated
and externally programmable. These include the fault current level, maxi-
mum output sourcing current, maximum fault time, selectionof Retryor
Latched mode, soft start time, and average power limiting.In the eventof constant fault, the internal timer will limit the on time from less than
0.1%toa maximumof 3% duty cycle. The duty cycle modulation de-
pends on the current into PL, whichisa functionof the voltage across
the FET, thus limiting average power dissipationin the FET. The fault
levelis fixedat 50mV across the current sense amplifierto minimize total
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