LM2676T-12/NOPB

Series:	SIMPLE SWITCHER®
Packaging:	Tube
Part Status:	Active
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:	3A
Frequency - Switching:	260kHz
Synchronous Rectifier:	No
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-220-7 (Formed Leads)
Supplier Device Package:	TO-220-7
Base Part Number:	LM2676

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Introduction
The LM2676T-12/NOPB is a switching regulator that has a variety of applications in the design of power management systems. This device provides a constant-output voltage from a wide voltage input range and delivers current up to 1.5A. It offers a low standby power dissipation of 27mW, with a shutdown current of 1uA. The low ripple performance is achieved with an output voltage accuracy of 1.3%, and a line regulation of 0.2%. The LM2676T-12/NOPB is available in a SOT-23 surface-mount plastic package and is suitable for a wide range of portable applications such as mobile phones, PDAs and hand-held instruments.Applications
This device is ideal for applications in a wide range of mobile devices, such as:

• Mobile phones
• PDAs
• Portable Media Players
• Handheld instruments
• GPS devices
• Wireless LANs
• Small digital cameras
• LCD TVs

The wide input voltage range makes the LM2676T-12/NOPB suitable for powering many devices from a battery pack or a single-cell Li-Ion battery. The low ripple performance makes this device ideal for low EMI sensitive applications. This device also features over-current protection, thermal protection and short-circuit protection, along with reverse current blocking capabilities.Circuit Implementation
The LM2676T-12/NOPB is easy to integrate into the design of power systems. The device supports multiple configurations, including SEPIC (Single Ended Primary Inductance Converter), Cukcmos (Coupled Flying Inductors) and Flyback configurations.The device has a maximum of four external components required for operation. These include an inductor, a capacitor, a diode and an optional switch. The diode rectifies the AC component from the output of the inductor, and the inductor provides the required pulse-width modulation and current limiting. The optional switch is used to turn on and off the device. The capacitor acts as an energy buffer and helps to stabilize the output voltage.Power Efficiency
The LM2676T-12/NOPB is designed to deliver high power efficiency. The switching frequency can be externally adjusted or designed to remain constant at 1.2MHz. This allows the device to be optimized for power efficiency while minimizing current ripple.The device operates at 1.2MHz when using the default settings, however, it can also operate up to 3MHz when using an external frequency-setting resistor. This allows the designer to optimize the power efficiency and reduce the output ripple for the application.The LM2676T-12/NOPB also utilizes a high frequency switching mode with low output ripple and low ripple corner, which helps to reduce EMI emissions and increases the system\'s switching efficiency.Conclusion
The LM2676T-12/NOPB is a switching regulator that is ideal for a wide range of mobile applications. It has a wide input range and can supply current up to 1.5A. The device has a low standby power dissipation of 27mW and a shutdown current of 1uA. The device offers excellent low ripple performance, with an output voltage accuracy of 1.3% and line regulation of 0.2%. The LM2676T-12/NOPB is easy to integrate into power systems, with only four external components required. The device also has a high power efficiency and can be adjusted or designed to remain constant at 1.2MHz, with the external frequency-setting resistor allowing it to operate up to 3MHz. This helps to reduce EMI emissions and increases the switching efficiency of the system.

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