LM2677S-12
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Texas Instruments LM2677S-12

Manufacturer No:
LM2677S-12
Manufacturer:
Texas Instruments
Package:
Tube
Description:
IC REG BUCK 12V 5A TO263-7
Delivery:
Payment:
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Product Introduction

Overview

The LM2677S-12 from Texas Instruments is a high-efficiency, 5A step-down switching regulator. It is part of the SIMPLE SWITCHER family, designed to provide a complete power supply solution with a minimal number of external components. This regulator is available in fixed output voltages of 3.3V, 5V, and 12V, as well as an adjustable output version. The LM2677S-12 is particularly noted for its high current capability and excellent line and load regulation characteristics, making it suitable for a variety of applications requiring efficient power management.

Key Specifications

Parameter Conditions Typical Minimum Maximum Units
Supply Voltage 8 40 V
Junction Temperature Range (TJ) -40 125 °C
Output Voltage (VOUT) VIN = 15V to 40V, 100mA ≤ IOUT ≤ 5A 12 11.76 12.24 V
Efficiency (η) VIN = 24V, ILOAD = 5A 92 %
Oscillator Frequency (fO) Measured at Switch Pin 260 225 280 kHz
Maximum Duty Cycle 91 %
Feedback Bias Current (IBIAS) VFEEDBACK = 1.3V 85 nA
ON/OFF Threshold (VON/OFF) 0.8 2.0 V

Key Features

  • High Efficiency: Achieves efficiency greater than 90% through the use of a low ON-resistance DMOS power switch.
  • Wide Input Voltage Range: Operates with input voltages from 8V to 40V.
  • Fixed and Adjustable Output Voltages: Available in fixed output voltages of 3.3V, 5V, and 12V, as well as an adjustable output version from 1.2V to 37V.
  • External Sync Clock Capability: Allows synchronization with an external clock in the range of 280kHz to 400kHz.
  • Low Standby Current: Draws only 50μA when switched off.
  • High Current Capability: Capable of driving up to 5A loads.
  • Simple Design: Requires a minimum number of external components, making design and implementation straightforward.

Applications

  • Efficient System Preregulator for Linear Voltage Regulators: Acts as a high-efficiency preregulator to improve overall system efficiency.
  • Battery Chargers: Suitable for battery charging applications due to its high efficiency and current capability.
  • Communications and Radio Equipment: Used in communications and radio equipment where synchronized clock frequency is beneficial.
  • General Power Supply Needs: Ideal for various power supply needs in electronic systems requiring high efficiency and reliability.

Q & A

  1. What is the input voltage range of the LM2677S-12?

    The input voltage range is from 8V to 40V.

  2. What are the fixed output voltage options available for the LM2677 series?

    The fixed output voltage options are 3.3V, 5V, and 12V.

  3. What is the maximum current capability of the LM2677S-12?

    The LM2677S-12 can drive up to 5A loads.

  4. What is the typical efficiency of the LM2677S-12?

    The typical efficiency is greater than 90%.

  5. Can the LM2677S-12 be synchronized with an external clock?

    Yes, it can be synchronized with an external clock in the range of 280kHz to 400kHz.

  6. What is the standby current when the LM2677S-12 is switched off?

    The standby current is 50μA when switched off.

  7. What is the operating junction temperature range of the LM2677S-12?

    The operating junction temperature range is from -40°C to 125°C.

  8. How does the LM2677S-12 achieve high efficiency?

    It achieves high efficiency through the use of a low ON-resistance DMOS power switch.

  9. What types of applications is the LM2677S-12 suitable for?

    It is suitable for applications such as efficient system preregulators, battery chargers, communications and radio equipment, and general power supply needs.

  10. How many external components are required for a complete design using the LM2677S-12?

    A minimal number of external components are required, making the design straightforward.

Product Attributes

Function:Step-Down
Output Configuration:Positive
Topology:Buck
Output Type:Fixed
Number of Outputs:1
Voltage - Input (Min):8V
Voltage - Input (Max):40V
Voltage - Output (Min/Fixed):12V
Voltage - Output (Max):- 
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 LM2677S-12 LM2678S-12 LM2677T-12 LM2677SD-12 LM2679S-12 LM2677SX-12 LM2676S-12
Manufacturer Texas Instruments Texas Instruments National Semiconductor National Semiconductor Texas Instruments Texas Instruments Texas Instruments
Product Status Obsolete Not For New Designs Active Active Obsolete Obsolete Not For New Designs
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 Fixed Fixed Fixed Fixed Fixed Fixed Fixed
Number of Outputs 1 1 1 1 1 1 1
Voltage - Input (Min) 8V 15V 8V 8V 8V 8V 8V
Voltage - Input (Max) 40V 40V 40V 40V 40V 40V 40V
Voltage - Output (Min/Fixed) 12V 12V 12V 12V 12V 12V 12V
Voltage - Output (Max) - - - - - - -
Current - Output 5A 5A 5A 5A 5A 5A 3A
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 Through Hole 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-220-7 Formed Leads 14-VDFN Exposed Pad 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
Supplier Device Package DDPAK/TO-263-7 DDPAK/TO-263-7 TO-220-7 14-VSON (6x5) DDPAK/TO-263-7 DDPAK/TO-263-7 DDPAK/TO-263-7

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