Home Power management Power switches eFuses & hot swap controllers

UCC3918

ACTIVE

3-V to 6-V hot swap controller

Product details

FET External Ron (typ) (mΩ) 75 Vin (min) (V) 3 Vin (max) (V) 6 Vabsmax_cont (V) 8 Current limit (min) (A) 1 Current limit (max) (A) 4.6 Overcurrent response current limiting Fault response Auto-retry Rating Catalog Device type eFuses and hot swap controllers Operating temperature range (°C) 0 to 70 Function Adjustable current limit, Short circuit protection, Thermal shutdown
FET External Ron (typ) (mΩ) 75 Vin (min) (V) 3 Vin (max) (V) 6 Vabsmax_cont (V) 8 Current limit (min) (A) 1 Current limit (max) (A) 4.6 Overcurrent response current limiting Fault response Auto-retry Rating Catalog Device type eFuses and hot swap controllers Operating temperature range (°C) 0 to 70 Function Adjustable current limit, Short circuit protection, Thermal shutdown
SOIC (D) 16 59.4 mm² 9.9 x 6
  • 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
  • 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

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.

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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Type Title Date
* Data sheet Low On-Resistance Hot Swap Power Manager datasheet (Rev. B) 28 Jun 2000
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018

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