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Design LM3489, LM3489-Q1
SNVS443C – MAY 2006 – REVISED DECEMBER 2016 LM3489x Hysteretic PFET Buck Controller With Enable Pin
1 Features 3 Description The LM3489 device is a high-efficiency PFET
switching regulator controller that can be used to
quickly and easily develop a small, cost-effective,
switching buck regulator for a wide range of
applications. The hysteretic control architecture
provides for simple design without any control loop
stability concerns using a wide variety of external
components. The PFET architecture also allows for
low component count as well as ultra-low dropout,
100% duty cycle operation. Another benefit is high
efficiency operation at light loads without an increase
in output ripple. A dedicated enable pin provides a
shutdown mode drawing only 7 ВµA. Leaving the
enable pin unconnected defaults to on. 1 Qualified for Automotive Parts
AEC-Q100 Qualified With the Following Results: …
