描述 Description

The LM2599 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.
The LM2598 is a member of the LM259x family, with additional supervisory and performance features added.
Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown and Soft-start, error flag delay, and error flag output.
The LM2599 series operates at a switching frequency of 150 kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 7-pin TO-220 package with several different lead bend options, and a 7-pin TO-263 surface-mount package.
A standard series of inductors (both through-hole and surface-mount types) are available from several different manufacturers optimized for use with the LM2599 series. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80-μA standby current. Self-protection features include a two stage current limit for the output switch and an overtemperature shutdown for complete protection under fault conditions.

特性 Features

? 3.3-V, 5-V, 12-V, and Adjustable Output Versions
? Adjustable Version Output Voltage Range: 1.2 V to 37 V ±4% Maximum Over Line and Load Conditions
? 3-A Output Current
? Available in 7-Pin TO-220 and TO-263 (Surface- Mount) Package
? Input Voltage Range Up to 40 V
? 150-kHz Fixed-Frequency Internal Oscillator
? Shutdown and Soft-Start
? Out-of-Regulation Error Flag
? Error Output Delay
? Low Power Standby Mode, IQ, Typically 80?μA
? High Efficiency
? Uses Readily Available Standard Inductors
? Thermal Shutdown and Current-Limit Protection