LM2596S-3.3 TO-263 SMD Package DataSheet

SIMPLE SWITCHER® Power Converter 150 kHz 3A Step-Down Voltage Regulator

Features: 3.3V output version ±4% max over line and load conditions Guaranteed 3A output current Input voltage range up to 40V Requires only 4 external components Excellent line and load regulation specifications 150 kHz fixed frequency internal oscillator TTL shutdown capability Low power standby mode IQ typically 80 μA High efficiency Uses readily available standard inductors Thermal shutdown and current limit protection Applications Simple high-efficiency step-down (buck) regulator Efficient pre-regulator for linear regulators On-card switching regulators Positive to negative converter (Buck-Boost)

Specificatons: Standard Package 500 / Rell Family PMIC - Voltage Regulators DC DC Switching Regulators Series SIMPLE SWITCHER® Type Step-Down (Buck) Output Type Fixed Number of Outputs 1 Voltage - Output 3.3V Voltage - Input 4.5 V ~ 40 V PWM Type Voltage Mode Frequency - Switching 150 kHz Current - Output 3A Operating Temperature -40°C ~ 125°C Mounting Type Surface Mount Package / Case TO-263-6, TO-263BA, D²Pak (5 Leads + Tab) Supplier Device Package TO-263-5 add to www.tme.vn Tuesday, November 27, 2012

Description

The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages 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 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 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package. A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 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 typically 80 μA 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.