4.8V, 1.5A High-Efficiency, Ultra-Small Buck Converter

The MAX77324 is a single channel high-efficiency synchronous step-down (buck) converter capable of delivering up to 1.5A of current. With a 6.89mm2 total solution size, up to 93% efficiency, and 40µA quiescent current, it is optimized for portable space constrained battery-operated applications.

The device operates over a 2.5V to 4.8V input voltage range to support Li+ battery powered applications. The output voltage is adjustable from 0.6V to 2V, with a better than 2% accuracy over the whole temperature range. The device uses constant-on-time PWM control scheme. A nominal 2MHz switching frequency reduces the overall solution footprint by use of small 0603 inductor. An automatic SKIP mode is also implemented to improve the light-load efficiency for MAX77324EWTAD+. MAX77324GEWTAD+ operates in PWM mode for all load conditions. The device provides low output voltage ripple, excellent line and load regulation, and transient response. A dedicated enable pin allows for simple hardware control. Built-in undervoltage lockout (UVLO), soft-start, active output discharge, cycle-by-cycle short-circuit, and thermal shutdown protections insure safe operations under abnormal operating conditions.

The device is available in a space-saving 1.22mm x 0.85mm, 6-bump wafer-level package (WLP).

Applications

* 1-Cell Battery Powered Equipment * Portable/Wearables * Internet of Things (IoT) Devices * Space Constrained Equipment

* 1.5A Output Current Step-down Converter

* 2.5V to 4.8V VIN Range

* 0.6V to 2V Adjustable VOUT Range, ±2% Accuracy

* MAX77324EWTAD+

* Skip Mode for High Light-Load Efficiency

* 40µA Quiescent Current

* MAX77324GEWTAD+

* PWM Mode Only

* 93% Peak Efficiency (3.8VIN, 1.8VOUT)

* 1µA Shutdown Current

* 2MHz Nominal Switching Frequency

* Enable Pin for Direct Hardware Control

* Cycle-by-Cycle Inductor Current Limit

* UVLO, Soft-Start, Active Output Discharge, Short-Circuit, and Thermal Shutdown Protections* 1.22mm x 0.85mm, 6-Bump WLP

* 6.89mm2 Total Solution Area

* Uses Small 0603 0.47µH Inductor