TDA21520
20 A OptiMOS™ power stage with integrated current sense
The TDA21520 OptiMOS™ power stage contains a low quiescent-current synchronous buck gate-driver IC co-packaged with high-side and low-side MOSFETs and an active diode structure that achieves low Vsd similar to a Schottky with very little reverse recovery charge. The TDA21520 power stage forms a complete low voltage, high power DC/DC regulator when used with Infineon multiphase controller ICs.
The TDA21520 internal MOSFET current sense algorithm with temperature compensation achieves superior current sense accuracy versus best-in-class controller-based inductor DCR sense methods. Operation at switching frequency as high as 1.5 MHz enables high performance transient response, allowing reduction of output inductance and output capacitance while maintaining industry leading efficiency.
Summary of Features
- Co-packaged driver, high-side and low-side MOSFETs and active diode structure
- Input voltage (Vin) range of 4.25 V to 16 V
- VCC and VDRV supply of 4.25 V to 5.5 V
- Output voltage range from 0.225 V up to 5.5 V
- On-chip MOSFET current sensing and reporting with 5 µA/A gain
- 20 A operating current with 36 A Output Over-Current Protection (OCP) capability
- Operation up to 1.5 MHz
- High-side MOSFET short detection and flag
- Thermal shutdown
- Cycle-by-cycle over current protection and fault flag
- Auto-sleep and deep-sleep mode for power saving
- Compatible with 3.3-V tri-state PWM input
- 4 mm x 5 mm x 0.9 mm PQFN package
Benefits
- Higher efficiency at the lower output voltages enabled by the gate driver and MOSFET combination
- Accurate current reporting to improve system level performance
- Current and temperature fault monitoring for a more robust system
- Bootstrap capacitor under-voltage monitoring and auto-replenishment for a more robust system
- Optimized PCB layout, heat, transfer, driver/MOSFET control timing, and minimal switch node ringing when layout guidelines are followed
Potential Applications
