MAX635BCSA+

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The MAX635BCSA+ is a DC DC switching regulator for PMIC voltage regulators, designed for use in mobile applications. It provides high efficiency in an ultra-compact 3mm × 3mm WLP package. The device uses a combination of hard switching and soft switching to achieve higher efficiency, lower EMI/​RFI, and lower cost. The MAX635BCSA+ has low esr / ecr, low output voltage drop, low standby current, and wide operating temperature range, making it ideal for use in mobile applications.

Operating Principle

The MAX635BCSA+ is a buck-boost type of switching regulator, which means it can both increase and decrease the input voltage depending on the load. It is a non-isolated converter, meaning that there is no isolation between input and output. The device operates with synchronous rectification, meaning that an additional PMOS transistor is connected parallel with the N-channel MOSFET in order to increase efficiency.

The MAX635BCSA+ operates on a fixed and variable frequency. In the fixed frequency mode, it operates as a buck regulator, meaning that the output voltage is lower than the input voltage. In the variable frequency mode, it operates as a boost converter, meaning that the output voltage is higher than the input voltage. During normal operation, the output voltage is regulated by comparing the voltage at the feedback pin to an internal reference voltage.

The internal loop of the MAX635BCSA+ is used to regulate the output voltage. The internal loop has a reference voltage, a voltage amplifier, an error amplifier, a comparator, and the gate driver. The gate driver then controls the switching of the transistors, which switches the converter on and off in order to regulate the output voltage.

Application Field

The MAX635BCSA+ is ideal for use in mobile applications where size, efficiency, and low standby current are important. It is also suitable for use in IoT, automotive, and industrial applications.

It can be used in applications such as:

• Battery-operated systems
• Portable electronic devices
• Modems
• Smartphones
• Tablets
• IoT devices
• Industrial systems
• Automotive systems

The MAX635BCSA+ can also be used in applications where a very low quiescent current is required, as the device can operate at very low standby currents of up to 40 μA.

The device is also suitable for use in applications where a controlled load current is required, as it has a programmable current limit of up to 25 A. This ensures that the output current stays within the specified range, protecting the device and avoiding potential damage.

The device has excellent thermal performance, making it ideal for use in high power applications. It is capable of delivering up to 25 A at a frequency of up to 1 kHz and can operate over a temperature range of -40°C to 85°C.

Conclusion

The MAX635BCSA+ is an ultralow quiescent current, high efficiency switching regulator for use in PMIC voltage regulators. It operates with a combination of hard switching and soft switching, making it ideal for low EMI/​RFI and low cost applications. Its wide operating temperature range, programmable current limit, and efficient thermal performance makes it suitable for use in mobile, industrial, automotive, and IoT applications.

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