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SNVS178H – JANUARY 2002 – REVISED DECEMBER 2015 LM3485 Hysteretic PFET Buck Controller
1 Features 3 Description The LM3485 is a high-efficiency PFET switching
regulator controller that can be used to quickly and
easily develop a small, low-cost, 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 ultralow dropout, 100% duty cycle
operation. Another benefit is high efficiency operation
at light loads without an increase in output ripple. 1 Easy-to-Use Control Methodology
No Control-Loop Compensation Required
4.5-V to 35-V Wide Input Range
1.242-V to VIN Adjustable Output Range
High Efficiency 93%
В±1.3% (В±2% Over Temp) Internal Reference …