LTC7821
Hybrid Step-Down
Synchronous Controller
FEATURES DESCRIPTION Wide VIN Range: 10V to 72V (80V ABS Max)
Soft Switching for Low Noise Operation
Phase-Lockable Fixed Frequency 200kHz to 1.5MHz
В±1% Output Voltage Accuracy
RSENSE or DCR Current Sensing
Programmable CCM, DCM, or Burst ModeВ® Operation
CLKOUT Pin for Multiphase Operation
Short Circuit Protected
EXTVCC Input for Improved Efficiency
Monotonic Output Voltage Start-Up
Optional External Reference
32-Pin (5mm Г— 5mm) QFN APPLICATIONS n The LTCВ®7821 uses a proprietary architecture that merges
a soft switching charge pump topology with a synchronous step-down converter to provide superior efficiency
and EMI performance compared to traditional switching
architectures.
In a typical 48V to 12V application, efficiency of greater
than 97% is attainable with the LTC7821 switching at
500kHz. The same efficiency can only be achieved with a
traditional controller switching at one-third the frequency.
Higher switching frequencies allow the use of smaller inductances that yield faster transient response and smaller …