1 Features
1• Adjustable With a Range of 1.23 V to 37 V and
±4% Regulation (Max) Over Line, Load, and
Temperature Conditions
• Specified 1-A Output Current
• Wide Input Voltage Range 4.75 V to 40 V
• Uses Readily Available Standard Inductors
• 52-kHz (Typical) Fixed-Frequency Internal
Oscillator
• TTL Shutdown Capability With 50-μA (Typical)
Standby Current
• High Efficiency…as High as 88% (Typical)
• Thermal Shutdown and Current-Limit Protection
With Cycle-by-Cycle Current Limiting
• For the Full Offering of Voltages (Including Fixed-
Output Options) and Packages (Including TO-
263), See TL2575 Data Sheet, SLVS638

2 Applications
• Simple High-Efficiency Step-Down (Buck)
Regulator
• Pre-Regulator for Linear Regulators
• On-Card Switching Regulators
• Positive-to-Negative Converter (Buck-Boost)

3 Description
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 operation.
The LM2575 is characterized for operation over the
virtual junction temperature range of –40°C to 125°C.