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Package | Pins | Size

SOIC (D) 16 59 mm² 9.9 x 6 open-in-new Find other eFuses & hot swap controllers

Features

  • Integrated 0.075- Power MOSFET
  • 3 V to 6 V Operation
  • External Analog Control of Fault Current from 0 A to 4 A
  • Independent Analog Control of Current Limit Up to 5 A
  • Fast Overload Protection
  • Unidirectional Switch
  • Minimal External Components
  • 1-uA ICC When Disabled
  • Programmable On Time
  • Programmable Start Delay
  • Fixed 3% Duty Cycle
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Description

The UCC3918 low on-resistance hot swap power manager provides complete power management, hot swap capability, and circuit breaker functions. The only components needed to operate the device, other than supply bypassing, are a timing capacitor, and two programming resistors. All control and housekeeping functions are integrated, and externally programmable. These include the fault current level, maximum output sourcing current, maximum fault time, and startup delay. In the event of a constant fault, the internal fixed 3%duty cycle ratio limits the average output power. The IFAULT pin allows linear programming of the fault level current from 0 A to 4 A.

Fast overload protection is accomplished by an additional overload comparator. Its threshold is internally set above the maximum sourcing current limit setting. In the event of a short circuit or extreme current condition, this comparator is tripped, shutting down the output. This function is needed since the maximum sourcing current limit loop has a finite bandwidth.

When the output current is below the fault level, the output MOSFET is switched on with a nominal resistance of 0.075 . When the output current exceeds the fault level or the maximum sourcing level, the output remains on, but the fault timer starts charging a capacitor connected to the CT pin (CT). Once CT charges to a preset threshold, the switch is turned off, and remains off for 30 times the programmed fault time. When the output current reaches the maximum sourcing level, the MOSFET transitions from a switch to a constant current source.

The UCC3918 is designed for unidirectional current flow, emulating an ideal diode in series with the power switch. This feature is particularly attractive in applications where many devices are powering a common bus, such as with SCSI termintation power (Termpwr). The UCC3918 can also be put into the sleep mode, drawing only 1 uA of supply current.

Other features include an open-drain fault output indicator, thermal shutdown, undervoltage lockout, 3 V to 6 V operation, and a low thermal resistance small-outline power package.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet Low On-Resistance Hot Swap Power Manager datasheet (Rev. B) Jun. 28, 2000
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles How to simulate a load switch circuit with varying input voltages and loads Nov. 14, 2016
Technical articles How to protect your server from hot swap events Aug. 08, 2016
Technical articles Simplify digital hot swap design using the PI-Commander GUI Jun. 06, 2016
Technical articles New approach for inrush current clamping with smart high side switch Mar. 26, 2015

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SOIC (D) 16 View options

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