LM1770TMF/NOPB

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Introduction to LM1770TMF/NOPB

The LM1770TMF/NOPB is an electronic controller in the Power Management Integration Circuits (PMICs) voltage regulators’ DC DC switching controllers segment. This controller generally is used by system designers when the immediate objectives are to reduce size, lower cost, and add system reliability of power supply designs.

Application Field

The LM1770TMF/NOPB DC DC switching controller is mainly used in a wide range of microprocessor-based systems, allowing the power supply design to be compact, reliable, and cost-effective. Those with highly efficient DC DC switching regulators can be designed with the LM1770TMF/NOPB. Examples of those include battery-powered and automotive power supplies, computer systems with auxiliary supplies, cellular phones and wireless LANs, and office automation equipment.

The LM1770TMF/NOPB DC DC switching controller is used in systems where the required output current is relatively high due to the maximum load current available from the device. This device is used to control the current through the on/off switch in a switching regulator. The switching regulator supports programmable output voltage, adjustable peak current limiter, foldback current limiter, and adjustable soft-start.

Working Principle

The LM1770TMF/NOPB DC DC switching controller is a high-frequency switching regulator that operates in the range of 20kHz to 700kHz. It is a fixed-frequency current-mode controller that uses voltage mode to regulate output voltage. This system is comprised of two parts, an external mosfet switch, and a controller.} The external switch is responsible for bringing voltage in the system and passing it to the output stage. The controller is a voltage control IC that adjusts the output voltage by regulating the switching frequency and the pulse width of the switch.

The LM1770TMF/NOPB DC DC switching controller works by sensing the output voltage and comparing it to the feedback voltage external reference. If the output voltage is lower than the feedback voltage, the system draws more current from the input and increases its operating frequency accordingly. If the output voltage is higher than the feedback voltage, then the voltage is driven up, resulting in less current being drawn from the input, and the operating frequency decreases.

The LM1770TMF/NOPB also supports the use of output voltage tracking which has the capability to adjust the output voltage in relation to any occurring variation in the input voltage, allowing for a regulated output voltage proportional to the input voltage. This feature also helps protect against excessive over-voltage conditions by providing programmable over-voltage protection.

The LM1770TMF/NOPB has provision for a number of protection features that protect the device from over-temperature and over-current. In the event of an over-current condition, the device will reduce its peak current limit by a specified amount after the over-current period has ended, to further protect itself from catastrophic events. It also includes a foldback feature that prevents instantaneous over-currents from occurring.

Conclusion

The LM1770TMF/NOPB is an electronic controller in Power Management Integration Circuits (PMICs) voltage regulators’ DC DC switching controllers segment. It is primarily used in microprocessor-based systems, automotive and battery-powered power supplies, and computers with auxiliary supplies. The LM1770TMF/NOPB works by sensing the output voltage, adjusting the switching frequency and pulse width of the external mosfet switch to regulate output voltage. This device also supports programmable peak current limiter, foldback current limiter, and adjustable soft-start. It comes with various protection features like protection against over-temperature and over-current.

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