System design simplified with dual-input diode O-ring circuit

Maxim Integrated Korea has launched the 'MAX77756' buck converter, which offers flexible options with 24V, 500mA, and low standby current for multi-cell USB Type C products requiring high current, dual input, and ^I2C support.

USB Type C products detect USB insertion by generating a 3.3V always-on power rail. The MAX77756 product, which utilizes a power supply in the 5-20V voltage range, can use a step-down converter to generate a digital supply rail for always-on power (1.8V/3.3V/5.0V) for the port controller.

The MAX77756 reduces standby power consumption by operating continuously with a low standby current of 20μA. The MAX77756 simplifies system design by featuring an ideal dual-input diode ORing circuit that supplies power from an external USB at the input to drive the chip when the battery is depleted.

Devices powered by multi-cell batteries, such as ultrabooks, laptops, tablet PCs, drones, and home automation products, can be easily expanded to Type C with Power Delivery capabilities through the flexible power supply of the MAX77756. The MAX77756 features an optimized combination of ^I2C for a wide input voltage range, low standby current, high current load, dual input, flexibility, and programming. In addition, if the customer does not want ^I2C bus input, the default power mode can be utilized.

The MAX77756 is a powerful integrated circuit (IC) that supports a standoff voltage of up to 26V, featuring short-circuit and thermal protection, an 8ms internal soft start to minimize inrush current, and a proven current mode control architecture. It supports a wide range of input voltages in a small 2.33mm x 1.42mm 15-bump WLP form factor that does not require an external Schottky array. The MAX77756 operates over the full VBUS range (5V-20V) and VBATT (2S, 3S, 4S Li+).

Jia Hu, Senior Business Manager for Mobile Power at Maxim, stated, “The MAX77756 incorporates a Field Effect Transistor (FET), eliminating the need for an external Schottky diode and reducing board space and series voltage drop. By offering the highest efficiency and lowest standby current compared to other products, the MAX77756 allows for minimized power consumption and extended battery life in end applications.”