Step-down switching regulator , adj., 4.5 ... 40 V, 5.0 V, 3 A,

SIMPLE SWITCHER® 4.5V to 40V, 3A Low Component Count Step-Down Regulator

Description:
The LM2596 series of regulators are monolithic integrated circuits that provide all theactive functions for a step-down (buck) switching regulator, capable of driving a 3-A load withexcellent 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. 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 smallersized filter components than what would be required with lower frequency switching regulators.Available in a standard 5-pin TO-220 package with several different lead bend options, and a 5-pinTO-263 SMD 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-modepower supplies. Other features include a ±4% tolerance on output voltage under specified input voltageand 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 frequencyreducing current limit for the output switch and an overtemperature shutdown for completeprotection under fault conditions.

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
- Available in TO-220 and TO-263 packages
- 3-A output load current
- Input voltage range up to 40 V
- Requires only four 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