LT1242CN8#PBF

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LT1242CN8#PBF Application Field and Working Principle

LT1242CN8#PBF is a high voltage step-up PWM power chip manufactured by Linear Technologies Corporation (LTC). It belongs to the Power Management, Integrated Circuits (PMICs) subcategory – AC DC Converters, Offline Switchers. It is a high efficiency DC-DC converter which boosts output voltage with the help of a super capacitors.

This PWM power chip is an ideal choice for high voltage step-up applications such as medical instrumentation, smart meters, energy harvesting systems, consumer electronics, and portable applications where battery compartments are limited to a small space. It also provides wide input voltage ranges from 2.5V to 8V making it suitable for industrial and consumer applications.

The LT1242CN8#PBF is capable of generating a maximum output of +14V at 1A and has very low on-resistance, thus enabling extended battery life. It is just 6mm x 6mm in size and is packaged in a Low Tempquake (LT) package ensuring high reliability by minimizing temp shock.

Working Principle of LT1242CN8#PBF

The LT1242CN8#PBF works on Buck converter based principle and utilizes peak current mode control technique to achieve its high efficiency. The primary side is made up of low side MOSFET Q1 and high side MOSFET Q2. The PWM control is provided by the integrated PWM logic block. The output voltage is sensed at the output capacitor. The duty cycle of the MOSFETS is continuously adjusted depending upon this voltage.

To protect the circuit from overcurrent and overtemperature, a current limit and thermal protection feature is built-in. The LT1242CN8#PBF is also capable of operating in either ePWM or PFM mode. In ePWM mode (Enable) mode the regulator keeps a continuous switching frequency which can be estimated by calculating the small signal frequency of the chip. In PFM mode (Disable) mode the switching frequency automatically reduces at low loads for improved efficiency.

Conclusion

The LT1242CN8#PBF is an ideal option for high voltage step-up applications due to its small size, low on-resistance, wide input voltage range, and high efficiency. Its integrated PWM logic block and protection features makes it highly reliable in even the harshest conditions. Its ability to operate in both PWM and PFM mode ensures better efficiency at varying loads.

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