Dual-Output, Configurable Multiphase Power-Supply Controller with PMBus Interface and Internal Buck Converter

The MAX20754 is a PMBus™-compatible, dualoutput, configurable multiphase power-supply controller for communication and networking applications. The controller is optimized for use with Maxim’s Dual Powertrain™ integrated power stages, which support a wide range of output current and voltage requirements. The controller generates six pulse-width modulated outputs, or “phases.” The number of phases per output channel is configurable to support high current requirements and one or two output voltages.

This highly versatile controller also includes an integrated switching regulator that supplies power for both the controller and the power-stage devices. The controller features accurate load-current reporting, power-stage temperature monitoring, fault detection, and extensive PMBus-command support. The controller allows the user to save desired PMBus parameters to nonvolatile memory.

The controller can be used with traditional discrete inductors, or with coupled-inductor topologies. Coupled inductors reduce the effective inductor value and size without increasing ripple current, reducing required output capacitance, and improving transient response.

The MAX20754 uses Maxim’s advanced modulation scheme (AMS) to provide improved transient response and reduce the required output capacitance compared to conventional pulse-width modulation (PWM) control. The AMS can be disabled if strict fixed-frequency PWM operation is desired.

Applications

* ASICs, DSPs, and FPGAs * Communication, Networking, Servers, and Storage Equipment * DDR Memory * Microprocessor Chipsets

* Versatile and Flexible Controller

* Generates Up to Six PWM Signals

* Single- or Dual-Voltage Output with Flexible Phase Assignment

* 0.5V to 2.0V Output-Voltage Range (MAX20754ETMA1+)

* 0.25V to 2.0V Output-Voltage Range (MAX20754ETMA2+)

* 4.5V to 16V Input-Voltage Range

* 300kHz to 800kHz Switching Frequency Range

* High-Power Density in a Small Overall Solution Size

* Supports Coupled-Inductor Technology

* Advanced Modulation Scheme Improves Transient Response

* High-Loop Bandwidth Reduces Output-Capacitance Requirements

* 48-Pin (7mm x 7mm) TQFN Package

* Phase-Current Steering for Thermal Balancing

* Efficient Integrated Internal Switching Regulator Powers Controller and Power Stages

* Simple System Configuration

* Four External Resistors Set Output Voltage, Bus Address, Switching Frequency, and Current Limit

* Comprehensive PMBus Configuration, Control, and Telemetry

* Compatible with PMBus Standard, Revision 1.3

* 10kHz to 1MHz Bus Speed

* PMBus Command Settings Stored in Nonvolatile Memory

* Accurate Current, Voltage, and Temperature Reporting