IR3721 Description
The IR3721 is a versatile power or current monitor IC for low-voltage DC-DC converters. The IR3721 monitors the inductor current in buck or multiphase converters using either a current sensing resistor or the inductor’s winding resistance (DCR). The output (DI) is a pulse code modulated signal whose duty ratio is proportional to the inductor current.
IR3721 Key Features
- Accurate TruePowerTM monitor
- 2.5% static accuracy
- Minimizes dynamic errors
- Minimizes power dissipation
- 150mV full scale current range
- Versatile
- Monitors power or current
- Single buck or multiphase converters
- Inductor DCR or resistive shunt sensing
- Simple add-on to existing converters