The UCC3912 family of hot swap power managers provides complete power management, hot swap capability, and circuit breaker functions. The only component required to operate the device, other than 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 3% 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 fault level when driven low, and to a full 4 A when driven high for applications which require 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 C_T. Once C_T 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 UCC3912 family 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 Termpwr.

The UCC3912 family can be put into sleep mode drawing only 1-µA of supply current. The SHTDWN\ pin has a preset threshold hysteresis which allows the user the ability to set a time delay upon startup to achieve sequencing of power. Other features include an open drain FAULT\ output indicator, thermal shutdown, under voltage lockout, and a low thermal resistance small outline package.

• Integrated 0.15- Power MOSFET
• 3-V to 8-V Operation
• Digital Programmable Current Limit from 0 A to 3 A
• Electronic Circuit Breaker Function
• 1μA ICC When Disabled
• Programmable On-Time
• Programmable Start Delay
• Fixed 3% Duty Cycle
• Unidirectional Switch
• 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, Low-Thermal Resistance Packaging

• FET
• External
• Ron (Typ) (mOhm)
• 150
• Vin (Min) (V)
• 3
• Vin (Max) (V)
• 8
• Vabsmax_cont (V)
• 8
• Current limit (Min) (A)
• 1
• Current limit (Max) (A)
• 4
• Overcurrent response
• Current limiting
• Fault response
• Auto-retry

UCC3912的完整型号有：UCC3912DP、UCC3912DPTR、UCC3912PWP、UCC3912PWPTR，以下是这些产品的关键参数及官网采购报价：

UCC3912DP，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UCC3912DP的批量USD价格：2.789（1000+）

UCC3912DPTR，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UCC3912DPTR的批量USD价格：2.343（1000+）

UCC3912PWP，工作温度：0 to 70，封装：TSSOP (PW)-24，包装数量MPQ：60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UCC3912PWP的批量USD价格：2.789（1000+）

UCC3912PWPTR，工作温度：0 to 70，封装：TSSOP (PW)-24，包装数量MPQ：2000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UCC3912PWPTR的批量USD价格：2.343（1000+）

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