The LM2575 device greatly simplifies the design of switching power supplies by
conveniently providing all the active functions needed for a step-down (buck) switching regulator
in an integrated circuit. Accepting a wide input voltage range and available in an adjustable
output version, the LM2575 has an integrated switch capable of delivering 1 A of load current, with
excellent line and load regulation. The device also offers internal frequency compensation, a
fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown. In addition, a
manual shutdown is available through an external ON/OFF pin.
The LM2575 represents a superior alternative to popular three-terminal linear regulators.
Due to its high efficiency, it significantly reduces the size of the heat sink and, in many cases,
no heat sink is required. Optimized for use with standard series of inductors available from
several different manufacturers, the LM2575 greatly simplifies the design of switch-mode power
supplies by requiring a minimal addition of only four to six external components for
The LM2575 is characterized for operation over the virtual junction temperature range of
40°C to 125°C.