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Analog Devices Inc. MAX77837 Switching Current Buck-Boost Converter is a nanoPower IC optimized for single-cell battery chemistries in wearable and Internet of Things (IoT) applications. MAX77837 operates on an input supply between 1.8V to 5.5V with output voltages (1.8V to 5.2V) set through resistors connected to two hardware control pins. Continuous conduction mode (CCM), skip mode, and low-power mode ensure high efficiency over a wide load current range. An ultra-low 430nA quiescent current (typical) and a shutdown current of 10nA (typical) make the buck-boost converter ideal for battery-powered applications requiring a long standby time.
The MAX77837 is available in a 1.84mm x 1.03mm, 8-bump wafer-level package (WLP) with a bump pitch of 0.4mm or a 2.5mm x 2.0mm, 8-lead flip-chip QFN package (FC2QFN) and offers two unique hardware control pins, SEL1 and SEL2. The resistor connected at SEL1 (RSEL1) selects a predefined combination of two output voltages between 1.8V to 5.2V, OUT1 and OUT2. The resistor connected at SEL2 (RSEL2) allows two different configurations of switch current limit at 1050mA and 400mA to optimize external component size, enable or disable the dynamic voltage scaling (DVS) function, and select either hiccup or latch-off mode during a hard short event. RSEL2 also configures the startup voltage as OUT1 or OUT2, and the DVS function can change the output voltage from a lower VOUT to a higher VOUT as required without powering down.
