LM3151,pdf datasheet (Synchron

The LM3151/2/3 SIMPLE SWITCHER? Controller is an easy
to use and simplified step down power controller capable of
providing up to 12A of output current in a typical application.
Operating with an input voltage range from 6V-42V, the
LM3151/2/3 features a fixed output voltage of 3.3V, and features
switching frequencies of 250 kHz, 500 kHz, and 750
kHz. The synchronous architecture provides for highly efficient
designs. The LM3151/2/3 controller employs a Constant
On-Time (COT) architecture with a proprietary Emulated Ripple
Mode (ERM) control that allows for the use of low ESR
output capacitors, which reduces overall solution size and
output voltage ripple. The Constant On-Time (COT) regulation
architecture allows for fast transient response and requires
no loop compensation, which reduces external component
count and reduces design complexity.