Buck converter extends battery life of USB Type-C devices

Higher current load, dual input, and I²C support are provided by the MAX77756 flexible buck converter, says Maxim Integrated. Developers of multi-cell, USB Type-C products can exploit its 24V, 500mA, low quiescent current (Iq) buck converter performance.

USB Type-C products must generate an always-on 3.3V rail to detect USB insertions. Products using the power delivery (PD) voltage range (5.0 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. The MAX77756 also has a 20-microA quiescent current that extends 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.

Ultrabooks, laptops, tablets, drones, home automation appliances and other multi-cell battery-operated devices can easily evolve to Type-C with PD using the flexible MAX77756 power supply, explains Maxim. The MAX77756 combines wide input voltage range, low quiescent current, higher current load, dual input, and I²C for flexibility and programmability. 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, eight-milliseconds internal soft-start to minimise inrush current, proven current-mode control architecture, and up to 26V input voltage standoff.

There is up to 92 per cent power efficiency with integrated power MUX.

The MAX77756 is offered in a small WLP, measuring 2.33 x 1.43mm. No external Schottky array is needed.

The MAX77756 is available from stock now. The MAX77756EVKIT# is also available from stock. Engineers can start designing with MAX77756 now using the EE-Sim Tool Suite.

Maxim Integrated develops analogue and mixed-signal products and technologies to make systems smaller and smarter, with enhanced security and increased energy efficiency. It provides products for the automotive, industrial, healthcare, mobile consumer, and cloud data centre markets.


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