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Buck converter powers USB Type-C transceivers for battery devices

Designers of USB Type-C small form factor devices can create always-on rails with the low quiescent current MAX77596 buck converter, says the company.

Portable gadgets, such as tablets, notebooks, cameras, and drones, can evolve to Type-C using the power supply. Previously, customers designing in a power supply for USB Type-C port controllers had to compromise on either input voltage range, quiescent current, or size.

Products that use the high data rates and increased power transfer capability of USB Type-C ports will require low-voltage supply rails to power Type-C port controllers. Devices using the Power Delivery (PD) voltage range (5.0 to 20V) can now generate an always-on (1.8, 3.3, 5.0V) digital supply rail for the controller using the MAX77596. Operating from as little as 3.5V and up to 24V, the step-down converter can regulate from traditional 5V USB power as well as the 20V upper-end of the PD range.

Replacing a two-chip solution of a low input voltage linear regulator in parallel with a higher input voltage switcher to cover the wide voltage range, the converter combines wide input voltage range, low quiescent current, in a
2.0 x 2.5 x 0.75mm 10pin TDFN package to reduce design time and a smaller form factor.

There are fixed 3.3 and 5.0V-output versions, and an adjustable version that allows users to program the output voltage between 1.0 and 10V with a resistor-divider. The converter can support up to 300mA DC loads. The IC has short-circuit and thermal protection, 6.67ms internal soft-start minimising in-rush current, proven current-mode control architecture, and up to 42V input voltage tolerance.

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