SIMPLE SWITCHER 5A Step-Down Voltage Regulator With Adjustable Current Limit

The LM2679 series of Regulators are monolithic integrated circuits which provide all of the active functions for a Step-down (buck) Switching Regulator capable of driving up to 5A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power Switch The series consists of fixed output voltages of 3.3V, 5V and 12V and an adjustable output version.
The SIMPLE SWITCHER concept provides for a complete design using a minimum number of external components. A high fixed frequency Oscillator (260KHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2679 are available from several manufacturers to greatly simplify the design process.
Other features include the ability to reduce the input surge current at power-ON by adding a softstart Timing capacitor to gradually turn on the Regulator The LM2679 series also has built in thermal shutdown and resistor programmable current limit of the Power MOSFET Switch to protect the device and load circuitry under fault conditions. The output voltage is guaranteed to a 2% tolerance. The Clock frequency is controlled to within a 11% tolerance.
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM2679S-ADJ/NOPB Texas Instruments SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit 7-DDPAK/TO-263 -40 to 125
LM2679SD-5.0/NOPB Texas Instruments SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit 14-VSON -40 to 125
LM2679T-5.0 Texas Instruments SIMPLE SWITCHER 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit 7-TO-220 -40 to 125
LM2679T-5.0/NOPB Texas Instruments SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit 7-TO-220 -40 to 125
LM2679SX-12/NOPB Texas Instruments SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit 7-DDPAK/TO-263 -40 to 125
LM2679SX-ADJ Texas Instruments SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit 7-DDPAK/TO-263 -40 to 125
LM2679S-5.0 Texas Instruments SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit 7-DDPAK/TO-263 -40 to 125
LM2679SX-5.0/NOPB Texas Instruments SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit 7-DDPAK/TO-263 -40 to 125
LM2679S-3.3 Texas Instruments SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit 7-DDPAK/TO-263 -40 to 125
LM2679SDX-3.3/NOPB Texas Instruments SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit 14-VSON -40 to 125
LM2679 's PackagesLM2679 's pdf datasheet
LM2679SD-12 LLP
LM2679SD-3.3 LLP
LM2679SD-5.0 LLP
LM2679SD-ADJ LLP
LM2679SDX-12 LLP
LM2679SDX-3.3 LLP
LM2679SDX-5.0 LLP
LM2679SDX-ADJ LLP
LM2679T-12 TO-220
LM2679T-3.3 TO-220
LM2679T-5.0 TO-220
LM2679T-ADJ TO-220
LM2679S-12 TO-263
LM2679S-3.3 TO-263
LM2679S-5.0 TO-263
LM2679S-ADJ TO-263
LM2679SX-12 TO-263
LM2679SX-3.3 TO-263
LM2679SX-5.0 TO-263
LM2679SX-ADJ TO-263




LM2679 Pinout, Pinouts
LM2679 pinout,Pin out
This is one package pinout of LM2679,If you need more pinouts please download LM2679's pdf datasheet.

LM2679 Application circuits
LM2679 circuits
This is one application circuit of LM2679,If you need more circuits,please download LM2679's pdf datasheet.


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