This part is covered in Fairchild's TinyCalc
Calculator™ for the design of TinyBuck™-based regulators.
The FAN21SV04 TinyBuck™ is a highly efficient, small-footprint,
programmable-frequency, 4A, integrated synchronous buck regulator.
FAN21SV04 contains both synchronous MOSFETs and a controller/driver with
optimized interconnects in one package, which enables designers to solve
high-current requirements in a small area with minimal external components,
thereby reducing cost. On-board internal 5V regulator enables single-supply
operation for input voltages >6.5V.
The FAN21SV04 can be configured to drive multiple slave devices OR
synchronize to an external system clock. In slave mode, FAN21SV04 may be set up
to be free-running in the absence of a master clock signal.
External compensation, programmable switching frequency, and current-limit
features allow for design optimization and flexibility. High-frequency operation
allows for all-ceramic solutions.
Fairchild’s advanced BiCMOS power process, combined with
low-RDS(ON) internal MOSFETs and a thermally efficient MLP package,
provide the ability to dissipate high power in a small package. Integration
helps minimize critical inductances, making layout simpler and more efficient
compared to discrete solutions.
Output over-voltage, under-voltage, over-current, and thermal-shutdown
protections help protect the device from damage during fault conditions.
FAN21SV04 prevents pre-biased output discharge during startup in point-of-load
applications.
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