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The MAX77533AEWC is a synchronous rectifier, 1.5A, step-down DC-DC converter optimised for use in 2- and 3-cell battery-powered and USB-C powered applications. The converters operate over a 3V to 14V input voltage range. The output voltage can be set via the I2C serial port from 0.8V to 5V in 50mV steps, or the output voltage can be adjusted using an external feedback resistor from 1.55V to 99% of the supply voltage. 1.2V, 1.8V, and 3.3V factory preset default voltages are provided, reducing the number of components in commonly used power rail designs. The devices offer a low IQ SKIP mode that allows efficient operation at light loads.

Features

1.5A single-channel buck regulator

3V to 14V input voltage range

0.8V to 99% VSUP output voltage range

I2C settable output voltage: 0.8V to 5V in 50mV steps

Output voltage settable via external feedback resistor: 1.55V to 99% VSUP

1.2V, 1.8V or 3.3V factory preset output options

High efficiency, low IQ for extended battery life

94% peak efficiency @ 7.4VSUP, 3.3VOUT (2520 inductance)

9μA IQ (12VSUP, 1.8VOUT internal feedback resistor)

Selectable light load SKIP and forced PWM modes

1MHz or 550kHz fixed switching frequency

Hardware or software controlled

Enable input and power ready output pins

Full control of power operation via I2C

Protection Functions

Cycle-by-cycle inductive peak current limit

Short-circuit hiccup mode protection, UVLO and thermal shutdown protection

1ms default soft start

Small Size

1.85mm x 1.4mm (0.7mm max height) WLP package

12-ball, 0.4mm ball pitch, 3 x 4 arrays

Applications

2-cell/3-cell high power density power supply

Drones, HD cameras and laptops

Portable Li+/Li ion battery powered devices

Space-constrained portable electronic devices

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