Analog Devices MAX77540 Product Info

• 4V to 16V Input Voltage Range
• 0.5V to 5.2V Output Voltage Range
• Resistor Configurable Default V_OUT
• Two 3A Bucks (1Φ) or One 6A Buck (2Φ)
• ±0.5% V_OUT Accuracy (Default V_OUT at 25°C)
• 94% Peak Efficiency (7.6V_IN, 3.3V_OUT, 1MHz)
• Auto SKIP/PWM and Low-Power Mode
• 98% Max. Duty Cycle Dropout Operation
• Programmable Soft-Start/Stop and Ramp-Up/Down Slew Rates
• Pre-Biased Startup and Active Output Discharge
• Programmable Inductor Peak Current Limits
• 0.5/1.0/1.6MHz Nominal Switching Frequency
• Spread-Spectrum Modulation
• Internal/External Frequency Tracking
• Dedicated EN, POK, and FPWM Pins
• Undervoltage lockout (UVLO), Thermal Shutdown, and Short-Circuit Protection
• High-Speed I²C I/F with 3-Slave Address Options
• 30-WLP (2.51mm x 2.31mm) and 24-FC2QFN (3mm x 3mm) Packages
• Less than 55mm² Total Solution Size

The MAX77540 is a high-efficiency step-down converter with two 3A switching phases. It 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. Its wide input voltage range enables a direct conversion for sub-1V outputs from 3-cell Li+ batteries, USB PD, and 12V_DC supply rails. The output voltages are preset with resistors and are further adjustable through an I²C-compatible interface. With 94% peak efficiency, low quiescent current, and compact solution size, the MAX77540 is ideal for battery powered, space-constraint equipment.

Programmable switching frequency, frequency tracking, and spread-spectrum allow easier system optimization for noise-sensitive applications. Dedicated EN, POK, and FPWM pins provide options for direct hardware control, while more programmable options, such as soft-start/stop and ramp-up/down slew-rates, are available through I²C. An array of built-in protections insures safe operation under abnormal operating conditions.

Applications

• 2/3-Cell Li+ and USB-C Power Delivery Systems
• Audio and Video Equipment
• Microprocessors, field-programmable gate arrays (FPGAs), digital signal processors (DSPs),andapplication-specific integrated circuits (ASICs)
• Networking and PCIe®/redundant array of inexpensive disks (RAID) Cards