16V/6A, Dual-Phase High-Efficiency Buck Converter

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 12VDC 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

* 4V to 16V Input Voltage Range

* 0.5V to 5.2V Output Voltage Range

* Resistor Configurable Default VOUT

* Two 3A Bucks (1Φ) or One 6A Buck (2Φ)

* ±0.5% VOUT Accuracy (Default VOUT at 25°C)

* 94% Peak Efficiency (7.6VIN, 3.3VOUT, 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