LM2696,pdf datasheet (Constant

The LM2696 is a pulse width modulation (PWM) buck regulator
capable of delivering up to 3A into a load. The control
loop utilizes a constant on-time control scheme with input
voltage feed forward. This provides a topology that has excellent
transient response without the need for compensation.
The input voltage feed forward ensures that a constant
switching frequency is maintained across the entire VIN range.
The LM2696 is capable of switching frequencies in the range
of 100 kHz to 500 kHz. Combined with an integrated 130
mΩ high side NMOS switch the LM2696 can utilize small
sized external components and provide high efficiency. An
internal soft-start and power-good flag are also provided to
allow for simple sequencing between multiple regulators.
The LM2696 is available with an adjustable output in an exposed
pad TSSOP-16 package.