LM43601PWPT Integrated Circuits (ICs)

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The LM43601PWPT is a DC-DC switching power supply step-up regulator that increases the voltage of a power source. It is part of a family of regulators manufactured small size and low quiescent power drain that is ideal for portable products and space-limited applications. The voltage range of the output is 0.9V up to the input voltage and can be adjusted with a low endurance current. The switching frequency and current limit can be programmed with external components, enabling a wide range of output current and voltage.

Target Applications

The LM43601PWPT is designed for low power and portable applications. It is designed for flexibility and enables different strategies for step-up conversion and supplies long battery lifetime. The automotive grade version is AEC-Q100 qualified for use in automotive dashboard and infotainment systems. Examples of other applications are 1-cell Li-Ion batteries, mobile handsets, PDAs, MP3 players, portable instrumentation, and medical equipment.

Features and Advantages

The LM43601PWPT DC-DC stepping regulator comes with key features and advantages;

• 2 MHz switching frequency and 0.7V to 3.3V input voltage range
• Integrated 400 mΩ high side switch and 0.5Ω low side switch with greater than 90% efficiency on most applications
• Integrated over‐temperature protection circuit with thermal protection shutdown
• Programmable current limit with external resistors
• 4.4V to 65V adjustable output voltage range
• Supports 1-cell Li-Ion battery and passively rectified input supply

Working Principle

The LM43601PWPT DC-DC switching power supply works when an external energy source is available like a battery, solar panel or USB power connector. The power source should be sufficient enough to meet the output current requirement of the application to be supplied. The input is first regulated by the integrated internal voltage regulator and then converted to the output voltage with a synchronous buck-boost converter using two switches (the high side and the low side MOSFET). The two switches are turned on and off based on the output required. The current limit threshold is adjusted by an external resistor. The internal regulator limits the amount of power supplied by the power source to the switching converter. The frequency of the switching is determined by an internal oscillator.

The LM43601PWPT DC-DC switching power supply has a wide input voltage range up to 3.6V and includes an adjustable output voltage range between 4.4V and 65V. It is a versatile solution that offers a wide range of regulation, current limit, and output capability. An integrated protection circuit monitors the output current and shuts down the circuit if needed. The thermal shutdown prevents any kind of damage to the device due to overheating.

Layout Guidelines and Heat Dissipation

Due to its functionality and operation, the LM43601PWPT is a sensitive component that requires proper circuit layout and heat dissipation for optimal performance. The device is internally protected by a temperature monitor that will shut off the device for protection if needed. To ensure best performance and prevent thermal overload, the component needs to operate within the rated junction temperature. To ensure proper heat dissipation, the component should be placed on a PCB with a thermal impedance below 25°C/W and a large heat sinking region. Proper component placement and layout are essential for heat dissipation and best performance.

Conclusion

The LM43601PWPT is a DC-DC switching power supply step-up regulator that increases the voltage of a power source while providing a wide range of output current and voltage. It is ideal for low power and portable applications such as 1-cell Li-Ion batteries, mobile handsets, PDAs, MP3 players, portable instrumentation, and medical equipment. It is important to follow the layout guidelines to ensure optimal performance and protection. With proper heat dissipation and component placement, the LM43601 is an ideal component for voltage regulation and power conversion.

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