New Step-Down Buck Converter Provides Single Stage Power Conversion in Multi-Cell Battery Applications

Published  February 1, 2022   0
L Lakshita
MAX77540 Step-Down Buck Converter

Analog Devices, Inc. has introduced the new MAX77540 step-down buck converter that provides single stage power conversion in multi-cell battery applications, such as augmented reality/virtual reality (ARVR) headsets, land mobile radios (LMRs), and digital single-lens reflex (DSLR) cameras. The power-dense MAX77540 buck converter features 94 percent peak efficiency and wafer level packaging that measures 61 percent smaller than traditional quad flat no-lead packages.

This new converter uses an adaptive COT (constant on-time) current-mode control architecture and the two 3A switching phases can be configured as either one (2Φ, 6A) or two (1Φ, 3A each) outputs. With wide input voltage range, it enables a direct conversion for sub-1V outputs from 3-cell Li+ batteries, USB PD, and 12VDC supply rails.

Moreover, default power on configuration only requires two external resistors, and an I2C interface allows further control for advanced power management techniques. External frequency tracking and spread spectrum modulation provide low electromagnetic interference (EMI) power conversions for data sensing and processing equipment.

Key Features

  • Wide 4V to 16V input voltage range and two 3A switching phases provide single step conversions to core voltages from USB-C rails and 2S and 3S multi-cell batteries.
  • Wafer level package measures 61 percent (2.5x) smaller than traditional quad flat no-lead packaging to fit in the most space-constrained applications.
  • 94 percent peak efficiency measured at 7.4V to 3.3V extends battery life.

Availability and Packaging

The MAX7750 step-down buck converter is now available in a 2.51mm x 2.31mm 30-bump wafer-level package (WLP).