LM22679QTJ-ADJ/NOPB

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LM22679QTJ-ADJ/NOPB Application Field and Working Principle

ABSTRACT:The LM22679QTJ-ADJ/NOPB device is a single-stage, high-performance DC-DC switching regulator optimized for 2.7V to 15V input and output voltage ranges. The LM22679QTJ-ADJ/NOPB is optimized for use with external switching MOSFETs, enabling the design of a wide range of output power levels, while achieving high efficiency, fast load step response, and excellent thermal performance. Operating frequency is from 300kHz to 2.2MHz, and the output voltage can be adjusted by either the onboard resistor divider or PWM dimming. In addition, the LM22679QTJ-ADJ/NOPB has a wide range of features such as short-circuit protection, programmable soft start and frequency synchronization, making it an ideal choice for light-load and/or low-noise applications.

The LM22679QTJ-ADJ/NOPB is a non-isolated buck DC-DC switching regulator device, which is applied in the fields of communications, industrial control, automotive electronics and household appliances, etc. The device is mainly composed of an operational amplifier, a voltage reference and a bunch of logic gates. In addition, the device contains several protection and feedback functions, such as over-voltage protection, over-current protection and under-voltage protection.

The Working Principle of LM22679QTJ-ADJ/NOPB

The LM22679QTJ-ADJ/NOPB device is primarily a high-frequency DC-DC buck switch mode regulator. It operates by switching an external switching MOSFET to regulate the output voltage. It can be used to convert a voltage from 2.7V to 15V down to the required output voltage. The basic principle is to compare an error amplifier\'s output voltage with an internal reference voltage, then use the resultant control signal to adjust the duty cycle of the power switch in order to maintain a constant output voltage.

In a simple buck regulator, the error amplifier compares the output voltage to a reference voltage and a feedback signal is generated and fed back to the regulator\'s input. If the feedback voltage is greater than the reference voltage, the power switch is turned "off" to reduce the amount of power going to the output. If the feedback voltage is less than the reference voltage, the power switch is turned "on" to increase the amount of power going to the output. This process is repeated at a fixed switching frequency, and the duty cycle of the switch is adjusted such that the output voltage is regulated to the reference voltage.

The LM22679QTJ-ADJ/NOPB features an adjustable soft-start function, which is used to limit the inrush current when the device is powered on. In addition, it is able to achieve frequency synchronization, which should reduce the switch-mode noise. The operating frequency of the LM22679QTJ-ADJ/NOPB can be adjusted from 300kHz to 2.2MHz.

Other Features of LM22679QTJ-ADJ/NOPB

The LM22679QTJ-ADJ/NOPB is built using BiCMOS process. It provides a complete protection function, including over-voltage protection, over-current protection, under-voltage protection and short-circuit protection. The device also features excellent thermal performance, fast load step response, efficient current mode operation and adjustable output voltage based on either external resistors or PWM dimming input.

In addition, the LM22679QTJ-ADJ/NOPB features adjustable current limit and adjustable soft-start, which can be programmed through a PMBus compatible serial interface. The device is capable of efficiently switching from 1.5A to 3.0A with a power efficiency up to 92%. The device also has low quiescent current of 2.8mA and low shutdown current of 85nA.

Conclusion

The LM22679QTJ-ADJ/NOPB is an efficient, single-stage, high-performance DC-DC switching regulator. It is optimized for use with external MOSFETs to enable a wide range of output power levels, while achieving high efficiency, fast load step response and excellent thermal performance. This device is suitable for communications devices, industrial control, automotive electronics and household appliances. In addition, it has a wide range of features, such as adjustable soft-start, frequency synchronization, and adjustable output voltage. All these features make the LM22679QTJ-ADJ/NOPB an ideal choice for light-load and/or low-noise applications.

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