LM2694,pdf datasheet (30V, 600

The LM2694 Step Down Switching Regulator features all of
the functions needed to implement a low cost, efficient, buck
bias regulator capable of supplying 0.6A to the load. This
buck regulator contains an N-Channel Buck Switch, and is
available in the 3 x 3 thermally enhanced LLP-10 package
and a TSSOP-14 package. The feedback regulation scheme
requires no loop compensation, results in fast load transient
response, and simplifies circuit implementation. The operating
frequency remains constant with line and load variations
due to the inverse relationship between the input voltage and
the on-time. The valley current limit results in a smooth
transition from constant voltage to constant current mode
when current limit is detected, reducing the frequency and
output voltage, without the use of foldback. Additional features
include: VCC under-voltage lockout, thermal shutdown,
gate drive under-voltage lockout, and maximum duty
cycle limiter.