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.