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Buck converter extends battery life of USB Type-C devices

Developers of multi-cell, USB Type-C products that need higher current, dual input, and I²C support can now use the MAX77756 24V, 500mA, low quiescent current buck converter from Maxim Integrated Products.

According to the company, products using the power delivery (PD) voltage range of 5V to 20V can generate an always-on (1.8V/3.3V/5.0V) digital supply rail for the port controller using the MAX77756 step-down converter. Efficiency is said to be up to 92% with integrated power MUX.

In addition, the MAX77756 has a 20µA quiescent current that is said to extend battery life by reducing idle power consumption. To simplify the system design, the MAX77756 has a dual input ideal diode ORing circuit that allows the chip to power from the external USB source if the battery is empty.
The company claims that multi-cell battery-operated devices – such as ultrabooks, laptops, tablets, drones, and home automation appliances – can easily evolve to Type-C with PD using the flexible MAX77756 power supply.

The MAX77756 has I²C for flexibility and programmability but there is also a default power mode if customers do not want to use the I²C bus. The MAX77756 is a robust IC with short-circuit and thermal protection, 8ms internal soft-start to minimise inrush current, proven current-mode control architecture, and up to 26V input voltage standoff.

Available in a 2.33 x 1.42 15-bump WLP, no external Schottky array is needed. The converter operates on full VBUS range of 5V to 20V and VBATT (2S, 3S, 4S Li+).

Author
Peggy Lee

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