LM2679 Series

SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit

Catalog

SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit

Part	Output Configuration	Number of Outputs	Package / Case	Operating Temperature [Min]	Operating Temperature [Max]	Mounting Type	Topology	Function	Current - Output	Voltage - Input (Min) [Min]	Voltage - Output (Min/Fixed)	Frequency - Switching	Supplier Device Package	Output Type	Output Type	Voltage - Output (Max)
Texas Instruments LM2679SD-3.3	Positive	1	14-VDFN Exposed Pad	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	14-VSON (5x6)	1.81 mOhm
Texas Instruments LM2679SD-3.3/NOPB	Positive	1	14-VDFN Exposed Pad	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	14-VSON (5x6)	1.81 mOhm
Texas Instruments LM2679SX-ADJ	Positive	1	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	1.21 V	260 kHz	TO-263 (DDPAK-7)		Adjustable	37 V
Texas Instruments LM2679SDX-ADJ	Positive	1	14-VDFN Exposed Pad	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	1.21 V	260 kHz	14-VSON (5x6)		Adjustable	37 V
Texas Instruments LM2679SDX-3.3/NOPB	Positive	1	14-VDFN Exposed Pad	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	14-VSON (6x5)	1.81 mOhm
Texas Instruments LM2679T-3.3	Positive	1	TO-220-7 Formed Leads	-40 °C	125 ¯C	Through Hole	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	TO-220-7	1.81 mOhm
Texas Instruments LM2679S-12	Positive	1	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	12 V	260 kHz	TO-263 (DDPAK-7)	1.81 mOhm
Texas Instruments LM2679SX-3.3/NOPB	Positive	1	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	TO-263 (DDPAK-7)	1.81 mOhm
Texas Instruments LM2679SX-3.3	Positive	1	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	TO-263 (DDPAK-7)	1.81 mOhm
Texas Instruments LM2679SDX-3.3	Positive	1	14-VDFN Exposed Pad	-40 °C	125 ¯C	Surface Mount	Buck	Step-Down	5 A	8 V	3.3 V	260 kHz	14-VSON (5x6)	1.81 mOhm

Catalog

SIMPLE SWITCHER® 8V to 40V, 5A Step-Down DC/DC Switching Regulator with Adjustable Current Limit

Key Features

• Efficiency Up to 92%Simple and Easy to Design Using Off-The-ShelfExternal ComponentsResistor Programmable Peak Current Limit Over aRange of 3 A to 7 A120-mΩ DMOS Output Switch3.3-V, 5-V, 12-V Fixed Output and Adjustable(1.2 V to 37 V) Versions±2% Maximum Output Tolerance Over Full Lineand Load ConditionsWide Input Voltage Range: 8 V to 40 V260-kHz Fixed Frequency Internal OscillatorSoft-Start Capability–40 to 125°C Operating Junction TemperatureRangeEfficiency Up to 92%Simple and Easy to Design Using Off-The-ShelfExternal ComponentsResistor Programmable Peak Current Limit Over aRange of 3 A to 7 A120-mΩ DMOS Output Switch3.3-V, 5-V, 12-V Fixed Output and Adjustable(1.2 V to 37 V) Versions±2% Maximum Output Tolerance Over Full Lineand Load ConditionsWide Input Voltage Range: 8 V to 40 V260-kHz Fixed Frequency Internal OscillatorSoft-Start Capability–40 to 125°C Operating Junction TemperatureRange

Description

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 5-A 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 3.3 V, 5 V, and 12 V 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 (260 kHz) 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 soft-start 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 specified to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance. 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 5-A 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 3.3 V, 5 V, and 12 V 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 (260 kHz) 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 soft-start 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 specified to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.