The LM27213 is a single-phase synchronous buck regulator controller designed to fully
support a portable microprocessor. On-chip gate drive makes for a compact, single chip solution.
Output currents in excess of 25 Amps are possible.
The IC employs a current mode hysteretic control mechanism. Inductor current is sensed
through a low value sense resistor.
The LM27213 will operate over an input voltage range of 5V to 30V. The output voltage is
programmed through 6 Voltage Identification (VID) pins and ranges from 0.700V to 1.708V in 64
Since the error in the output voltage directly sets the inductor current, the dynamic
response to a large, fast load transient is close to a square wave. This is optimal for mode
transition requirements. Also, due to the intrinsic input voltage feedforward characteristic of
hysteretic control, the line transient response is excellent as well.
The IC provides cycle-by-cycle peak current limit, over-voltage protection, and a power
good signal. The LM27213 fully supports the Stop CPU and Sleep modes offered by some processors.
When enabled, the IC enters a power-saving “diode emulator” mode which helps prolong battery
runtime for portable systems.
The LM27213 also has a soft start feature for the external adjustment of soft start