
LM2674MX-12 Integrated Circuits (ICs) |
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Allicdata Part #: | LM2674MX-12TR-ND |
Manufacturer Part#: |
LM2674MX-12 |
Price: | $ 0.00 |
Product Category: | Integrated Circuits (ICs) |
Manufacturer: | Texas Instruments |
Short Description: | IC REG BUCK 12V 0.5A 8SOIC |
More Detail: | Buck Switching Regulator IC Positive Fixed 12V 1 O... |
DataSheet: | ![]() |
Quantity: | 1000 |
Voltage - Output (Min/Fixed): | 12V |
Base Part Number: | LM2674 |
Supplier Device Package: | 8-SOIC |
Package / Case: | 8-SOIC (0.154", 3.90mm Width) |
Mounting Type: | Surface Mount |
Operating Temperature: | -40°C ~ 125°C (TJ) |
Synchronous Rectifier: | No |
Frequency - Switching: | 260kHz |
Current - Output: | 500mA |
Voltage - Output (Max): | -- |
Series: | SIMPLE SWITCHER® |
Voltage - Input (Max): | 40V |
Voltage - Input (Min): | 6.5V |
Number of Outputs: | 1 |
Output Type: | Fixed |
Topology: | Buck |
Output Configuration: | Positive |
Function: | Step-Down |
Part Status: | Obsolete |
Packaging: | Tape & Reel (TR) |
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LM2674MX-12 Application Field and Working Principle
The LM2674MX-12 is a Pulsed Mode, Step-down DC-DC converter from Texas Instruments. It is a high-efficiency, non-synchronous buck controller that is ideal for powering space-constrained, cost-sensitive applications such as cell phones, portable/handheld devices and low power remote radio frequency (RF) applications. With its simple yet effective design, the LM2674MX-12 provides a regulated output voltage with minimal external components while consuming little power. This makes it ideal for applications that require a high level of efficiency in a low-cost, low profile package.
Its design includes an external high-current sense resistor to adjust the current limiting, current mode control to provide fast transient response and tightly regulated output, high-side and low-side n-channel MOSFET switches (80mΩ and 40mΩ on-resistance) that provide low switch losses and fast switching speeds, low quiescent current, low EMI and low noise, and an internal voltage reference that allows for high accuracy and stability. The LM2674MX-12 also features weak pull-down resistors on its enable and switch pins that allow the logic circuitry to be floating for improved cost optimization.
Application Field
The LM2674MX-12 is designed for space-constrained, cost-sensitive applications that require a low profile and low component count solution. It is particularly suitable for powering small, remote radio frequency (RF) applications where high efficiency, low quiescent current, low EMI and low noise are key requirements. This includes Bluetooth modules, 802.11 wireless LANs, digital-spread-spectrum handsets, and other low power remote RF applications. The device is also suitable for powering cellular phones, PDAs, digital cameras, and other portable/handheld devices.
Working Principle
The working principle of the LM2674MX-12 is based on a Pulsed Mode, Step-down DC-DC converter topology. At the core of its operation is a high-side n-channel MOSFET switch and a low-side n-channel MOSFET switch, allowing for low switch losses and efficient power conversion. An input voltage is connected to the DC-input side of the converter, and the regulated output voltage is provided to the DC-output side. An external high current sense resistor adjusts the current limiting for the high-side switch. The internal voltage reference provides high accuracy and stability for the output voltage.
When the input voltage is higher than the output voltage, the high side switch is turned on, allowing current to flow from the input to the output side. Conversely, when the input voltage is lower than the output voltage, the low side switch is turned on, allowing current to flow from the output side to the input side. This is the basic operating principle of the converter, allowing the output voltage to remain stable and regulated regardless of input voltage variations.
Conclusion
The LM2674MX-12 is a high-efficiency, non-synchronous buck controller from Texas Instruments that can be used in space-constrained, cost-sensitive applications to provide a regulated output voltage with minimal external components. It features an external high-current sense resistor to adjust the current limiting, high-side and low-side n-channel MOSFET switches that provide low switch losses and fast switching speeds, low quiescent current, low EMI and low noise, and an internal voltage reference that allows for high accuracy and stability.
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