TPS546B26 4V to 18V Input, 25A, Synchronous Buck Converter With PMBus and Telemetry

1 Features

4V to 18V input voltage without external bias
2.7V to 18V input voltage with external bias
0.4V to 5.5V output voltage
Supports 25A single-phase
Rds_{on_HS} = 2.6mΩ, Rds_{on_LS} = 1mΩ
400kHz to 2MHz operating frequency (four discrete settings through pin-strap, additional settings through PMBus®)
PMBus programmable
- Revision 1.5 compliant with PASSKEY security feature
- Input voltage, output voltage, output current, temperature telemetry
- Programmable overcurrent, overvoltage, undervoltage, overtemperature protections
- Extended write protection feature
- Non-volatile memory to store configuration settings
Two methods for programming the output voltage
- Internal resistor divider (discrete settings) with boot-up voltage selected by pin-strapping
- External resistor divider (continuous settings) with boot-up voltage selected by VBOOT
Precision voltage reference and differential remote sense for high output accuracy
- +/– 0.5% DAC accuracy from 0°C to 85°C junction
- +/– 1% VOUT tolerance from –40°C to 125°C junction
Selectable FCCM/DCM in single phase only
Start-up without PMBus communication through pin-strapping
Safe start-up into prebiased output
0.5ms to 16ms programmable soft-start time
D-CAP4 control topology with fast transient response, supporting all ceramic output capacitors
Programmable internal loop compensation
Selectable cycle-by-cycle valley current limit
Open-drain power-good output