5.5V Input, 4.4A/3.6A Switching Current 6μA I Buck-Boost Converter

The MAX77839 is a highly-efficient buck-boost regulator with an industry leading quiescent current of 6μA targeted for one-cell Li-ion and down to any battery chemistry with 1.8V discharge voltage. It supports input voltages of 1.8V to 5.5V and an output voltage range of 2.3V to 5.3V. The IC provides two different switching current limits to optimize external component sizing based on given load current requirements ("A" and "B" = 4.4A (typ), "C" and "D" = 3.6A (typ)), and two different GPIO pin configurations ("A" and "C" = FPWM pin,"B" and "D" = POK pin). These options provide design flexibility that allow the IC to cover a wide range of applications and use cases while minimizing board space.

The IC features a single-resistor adjustable output voltage from 2.3V to 5.3V. A configurable GPIO pin allows to select either a FPWM mode control input or an active-low POK open drain output, depending on the system requirements. Maxim's unique buck-boost controller technology provides high efficiency, excellent load and line transient response, and a seamless transition between buck and boost modes of operation.

The MAX77839 is available in both a 2.07mm x 1.51mm, 15-bump wafer-level package (WLP), and a 2.5mm x 2.0mm, 11-lead FC2QFN package.

Applications

* Asset Tracking/Fleet Management * 5G/2G/GSM Cellular Power * RF Amplifier * Smartphones ToF/Facial and Gesture Recognition * System Power Pre-Regulation * Single-Cell Li-ion Battery Powered Devices

* Flexible System Integration

* 1.8V to 5.5V Input Voltage Range * 2.3V to 5.3V Single Resistor Adjustable Output

* 3A Maximum Output Current

* 4.4A ILIM, See TOC 24 ("A" and "B" Options)

* 3.6A ILIM, See TOC 23 ("C" and "D" Options)

* 96% Peak Efficiency (VIN = 3.6V, VOUT = 3.3V) * Optional GPIO Pin (FPWM Input, Active-Low POK Output)

* Low Supply Current that Extends Battery Life

* Skip Mode that Reduces Supply Current at Light Loads * 6μA Ultra-Low IQ

* 2.2MHz (typ) Switching Frequency * Integrated Protections that Provide System Robustness

* Undervoltage Lockout (UVLO) * Overvoltage Protection (OVP) * Cycle-by-Cycle Inductor Peak Current Limit * Thermal Shutdown (TSHDN)

* Active Output Discharge * Small Solution Size

* 2.07mm x 1.51mm, 0.4mm Pitch, 15-Bump WLP * 2.5mm x 2.0mm, 0.5mm Pitch, 11-Pin FC2QFN