5.5V/6A, Dual-Phase High-Efficiency Buck Converter

The MAX77541 is a high-efficiency step-down converter with two 3A switching phases for single-cell Li+ battery and 5VDC systems. 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. The output voltages are preset with resistors and are further adjustable through an I2C compatible interface. With 91% peak efficiency, low quiescent current, and compact solution size, the MAX77541 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 ensures safe operation under abnormal operating conditions.

Applications

* Single-Cell Li+ and 5VDC Systems * Gaming Consoles and VR/AR Headsets * Microprocessors, FPGAs, DSPs, and ASICs * Network Switches and Routers

* 2.2V to 5.5V Input Voltage Range * 0.3V to 5.2V Output Voltage Range * Two 3A Bucks (1Φ) or One 6A Buck (2Φ) * ±0.5% VOUT Accuracy (Default VOUT at 25°C) * 91% Peak Efficiency (3.8VIN, 1.1VOUT, 1.6MHz) * Auto SKIP/PWM Transition and Low-Power Mode * Drop-Out Operation with 98% of Max. Duty Cycle * Programmable Soft-Start/Soft-Stop and Ramp-up/Ramp-down Slew-rates * Prebiased Startup and Active Output Discharge * Programmable Inductor Peak Current Limits for Solution Size Optimization * 0.5/1.0/1.6MHz Nominal Switching Frequency * Spread-Spectrum Modulation for EMI Reduction * Internal/External Frequency Tracking * Default VOUT and Phase Configuration Setting by RSEL1 and RSEL2 * I2C Slave ADDR, ILIM, and FSW Preset by RCFG * Dedicated ENx, POKx and FPWMx for each Buck * UVLO, Thermal Shutdown, and Short-circuit Protection * High-Speed I2C Serial I/F * Available in 30-WLP (2.51mm x 2.31mm x 0.7mm) and 24-FC2QFN (3mm x 3mm) Packages * Less than 55mm2 Total Solution Size with 2520 Inductors