LM2678SX-ADJ
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National Semiconductor LM2678SX-ADJ

Manufacturer No:
LM2678SX-ADJ
Manufacturer:
National Semiconductor
Package:
Bulk
Description:
SWITCHING REG, VOLTAGE-MODE, 5A,
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The LM2678SX-ADJ is part of the SIMPLE SWITCHER® family of power converters, designed to provide all the active functions for a step-down switching regulator. This monolithic integrated circuit can drive up to 5-A loads with excellent line and load regulation characteristics. It is known for its high efficiency, achieved through the use of a low ON-resistance DMOS power switch.

Key Specifications

ParameterTest ConditionsTypicalMinimumMaximumUnit
Output Voltage (Adjustable)VIN = 8 V to 40 V, 100 mA ≤ IOUT ≤ 5 A1.2 to 371.237V
EfficiencyVIN = 12 V, ILOAD = 5 A84%82%92%%
Switch ON-ResistanceISWITCH = 5 A, TJ = 25°C0.120.100.14Ω
Input Voltage Range840V
Oscillator FrequencyTJ = 25°C260 kHz225 kHz280 kHzkHz
Operating Junction Temperature Range-40125°C
Standby Quiescent CurrentON/OFF pin = 0 V, TJ = 25°C50 μA50 μA150 μAμA

Key Features

  • High Efficiency: Up to 92% efficiency, achieved through the use of a low ON-resistance DMOS power switch.
  • Simple Design: Easy to design using off-the-shelf external components.
  • Fixed and Adjustable Output: Available in fixed output voltages of 3.3 V, 5 V, and 12 V, and an adjustable output version from 1.2 V to 37 V.
  • Low Standby Current: 50-μA quiescent current when switched off.
  • Wide Input Voltage Range: Operates with input voltages from 8 V to 40 V.
  • Fixed Frequency Oscillator: 260-kHz fixed frequency internal oscillator.
  • Thermal Protection: Built-in thermal shutdown and current limiting.
  • ON/OFF Control: ON/OFF control input to power down the regulator to a low quiescent current standby condition.

Applications

  • Simple-to-Design, High Efficiency Step-Down Switching Regulators: Ideal for applications requiring high current capability and efficient operation.
  • Efficient System Preregulator for Linear Voltage Regulators: Can be used as a preregulator to improve overall system efficiency.
  • Battery Chargers: Suitable for battery charging applications due to its high efficiency and adjustable output.

Q & A

  1. Q: What is the maximum output current of the LM2678SX-ADJ?
    A: The LM2678SX-ADJ can drive up to 5-A loads.
  2. Q: What are the fixed output voltage options available for the LM2678?
    A: The fixed output voltage options are 3.3 V, 5 V, and 12 V.
  3. Q: What is the adjustable output voltage range of the LM2678SX-ADJ?
    A: The adjustable output voltage range is from 1.2 V to 37 V.
  4. Q: What is the typical efficiency of the LM2678SX-ADJ?
    A: The typical efficiency is up to 92%.
  5. Q: What is the input voltage range for the LM2678SX-ADJ?
    A: The input voltage range is from 8 V to 40 V.
  6. Q: How does the ON/OFF control work on the LM2678SX-ADJ?
    A: The ON/OFF control input can power down the regulator to a low 50-μA quiescent current standby condition by connecting the pin to ground or any voltage less than 0.8 V.
  7. Q: What is the oscillator frequency of the LM2678SX-ADJ?
    A: The oscillator frequency is 260 kHz.
  8. Q: Does the LM2678SX-ADJ have built-in thermal protection?
    A: Yes, it has built-in thermal shutdown and current limiting.
  9. Q: What is the standby quiescent current of the LM2678SX-ADJ when switched off?
    A: The standby quiescent current is 50 μA.
  10. Q: Can the LM2678SX-ADJ be used in battery charging applications?
    A: Yes, it is suitable for battery charging applications due to its high efficiency and adjustable output.

Product Attributes

Function:Step-Down
Output Configuration:Positive
Topology:Buck
Output Type:Adjustable
Number of Outputs:1
Voltage - Input (Min):8V
Voltage - Input (Max):40V
Voltage - Output (Min/Fixed):1.21V
Voltage - Output (Max):37V
Current - Output:5A
Frequency - Switching:260kHz
Synchronous Rectifier:No
Operating Temperature:-40°C ~ 125°C (TJ)
Mounting Type:Surface Mount
Package / Case:TO-263-8, D²Pak (7 Leads + Tab), TO-263CA
Supplier Device Package:DDPAK/TO-263-7
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Similar Products

Part Number LM2678SX-ADJ LM2679SX-ADJ LM2676SX-ADJ LM2677SX-ADJ LM2678S-ADJ LM2678SD-ADJ LM2678SDX-ADJ
Manufacturer National Semiconductor Texas Instruments Texas Instruments National Semiconductor Texas Instruments National Semiconductor Texas Instruments
Product Status Active Not For New Designs Not For New Designs Active Not For New Designs Active Obsolete
Function Step-Down Step-Down Step-Down Step-Down Step-Down Step-Down Step-Down
Output Configuration Positive Positive Positive Positive Positive Positive Positive
Topology Buck Buck Buck Buck Buck Buck Buck
Output Type Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable Adjustable
Number of Outputs 1 1 1 1 1 1 1
Voltage - Input (Min) 8V 8V 8V 8V 8V 8V 8V
Voltage - Input (Max) 40V 40V 40V 40V 40V 40V 40V
Voltage - Output (Min/Fixed) 1.21V 1.21V 1.2V 1.21V 1.21V 1.21V 1.21V
Voltage - Output (Max) 37V 37V 37V 37V 37V 37V 37V
Current - Output 5A 5A 3A 5A 5A 5A 5A
Frequency - Switching 260kHz 260kHz 260kHz 260kHz 260kHz 260kHz 260kHz
Synchronous Rectifier No No No No No No No
Operating Temperature -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ)
Mounting Type Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package / Case TO-263-8, D²Pak (7 Leads + Tab), TO-263CA TO-263-8, D²Pak (7 Leads + Tab), TO-263CA TO-263-8, D²Pak (7 Leads + Tab), TO-263CA TO-263-8, D²Pak (7 Leads + Tab), TO-263CA TO-263-8, D²Pak (7 Leads + Tab), TO-263CA 14-VDFN Exposed Pad 14-VDFN Exposed Pad
Supplier Device Package DDPAK/TO-263-7 DDPAK/TO-263-7 DDPAK/TO-263-7 DDPAK/TO-263-7 DDPAK/TO-263-7 14-VSON (5x6) 14-VSON (5x6)

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