The UCC3915 programmable hot swap power manager provides complete power-management, hot-swap capability, and circuit breaker functions. The only external component required to operate the device, other than power supply bypassing, is the fault-timing capacitor, C_T. 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 2% duty cycle ratio limits average output power.

The internal 4-bit DAC allows programming of the fault-level current from 0 A to 3 A with 0.25-A resolution. The IMAX control pin sets the maximum-sourcing current to 1 A above the trip level or to a full 4 A of output current for fast output capacitor charging.

When the output current is below the fault level, the output MOSFET is switched on with a nominal ON resistance of 0.15 . When the output current exceeds the fault level, but is less than the maximum-sourcing level, the output remains switched on, but the fault timer starts, charging CT. Once CT charges to a preset threshold, the switch is turned off, and remains off for 50 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 UCC3915 can be put into sleep mode, drawing only 100 uA of supply current. Other features include an open-drain fault-output indicator, thermal shutdown, undervoltage lockout, 7-V to 15-V operation, and low-thermal resistance SOIC and TSSOP power packages.

• Integrated 0.15- Power MOSFET
• 7-V to 15-V Operation
• Digital-Programmable Current Limit from 0 A to 3 A
• 100-uA ICC When Disabled
• Programmable On Time
• Programmable Start Delay
• Fixed 2% Duty Cycle
• Thermal Shutdown
• Fault-Output Indicator
• Maximum-Output Current Can Be Set to 1 A Above the Programmed-Fault Level or to a Full 4 A
• Power SOIC and TSSOP, Low Thermal Resistance Packaging

• FET
• External
• Ron (Typ) (mOhm)
• 150
• Vin (Min) (V)
• 7
• Vin (Max) (V)
• 15
• Vabsmax_cont (V)
• 15.5
• Current limit (Min) (A)
• 1
• Current limit (Max) (A)
• 4
• Overcurrent response
• Current limiting
• Fault response
• Auto-retry

UCC3915的完整型号有：UCC3915DP、UCC3915DPTR，以下是这些产品的关键参数及官网采购报价：

UCC3915DP，工作温度：0 to 70，封装：SOIC (D)-16，包装数量MPQ：40个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UCC3915DP的批量USD价格：3.089（1000+）

UCC3915DPTR，工作温度：0 to 70，封装：SOIC (D)-16，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UCC3915DPTR的批量USD价格：2.595（1000+）

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