CYStech Electronics Corp.

Spec. No. : C548F5

Issued Date : 2007.12.11

Revised Date :

Page No. : 1/12

LM2596-XXE5/F5

CYStek Product Specification

150kHz, 3A PWM Buck DC/DC Converter

LM2596-XXE5/F5

Description

The LM2596-XXE5/F5 series of regulators are monolithic ICs that provide all active functions for a step-down

(buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are

available in fixed output voltage of 3.3V, 5V, 12V and an adjustable output version. Requiring a minimum number of

external components, these regulators are simple to use and include internal frequency compensation and a fixed-

frequency oscillator.

The LM2596-XXE5/F5 series operates at a switching frequency of 150kHz, thus allowing smaller sized filter

components than what would be needed with lower frequency switching regulators. Available in standard 5-lead

TO-220 and TO-263 packages with several different lead bend options. A standard series of inductors are available

from several different manufacturers optimized for use with the LM2596-XXE5/F5 series. This feature greatly

simplifies the design of switch-mode power supplies. Other features include a guaranteed ±4% tolerance on output

voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External

shutdown is included, featuring 80μA standby current. Self protection features include a two stage frequency

reducing current limit for the output switch and an over temperature shutdown for complete protection under fault

conditions.

Features

● 3.3V, 5V, 12V, and adjustable output versions

● Adjustable version output voltage range, 1.3V to 37V±4% max over line and load conditions

● 150kHz±15% fixed switching frequency

● TTL shutdown capability

● Operating voltage can be up to 40V

● Output load current:3A

● TO220-5L and TO263-5L packages

● Low power standby mode.

● Thermal shutdown and current limit protection.

● High efficiency

● Built-in switching transistor on chip

● Requires only 4 external components

● Use readily available standard inductors

Applications

● Simple high-efficiency step-down (buck) regulator.

● Positive to negative converter (Buck-Boost).

● On-card switching regulators.