The UCC1919 UCC2919 UCC3919 is a hot swap power manager from Texas Instruments, which features precision fault threshold, low RDSON high side drive, differential sense inputs, programmable average power limiting, programmable linear current control, programmable fault time, fault output indicator, manual and automatic reset modes, shutdown control with programmable softstart, undervoltage lockout and electronic circuit breaker function.
The UCC3919 family of Hot Swap Power Managers provides complete power management, hot swap, and fault handling capability. The devices feature a duty ratio current limiting technique that provides peak load capability while limiting the average power dissipation of an external pass transistor during fault conditions.
These integrated circuits include two reset modes selected via the L/R pin: one mode repeatedly tries to reset at a user-defined rate with defined limits, while the other latches off until manually reset. An on-board charge pump circuit generates the necessary gate voltage for driving an external N-channel power FET.
| Input Supply Voltage Range | 3V to 8V |
|---|---|
| Undervoltage Lockout Minimum Start Voltage | 2.35 V (Typ 2.75 V) |
| Maximum Output Current | 1.5 mA |
| Storage Temperature Range (UCC1919) | -55°C to +125°C |
| Charge Pump Maximum Output Voltage (VDD=3V) | 8 V to 12 V |
| Charge Pump Source Impedance (Typical) | 50 kΩ to 150 kΩ |
The document covers the UCC1919, UCC2919, and UCC3919 models.
It uses a duty ratio current limiting technique to limit average power dissipation while maintaining peak load capability.