General Description

The MAX5065/MAX5067 dual-phase, PWM controllers provide high-output-current capability in a compact package with a minimum number of external components. The MAX5065/MAX5067 utilize a dual-phase, average-current-mode control that enables optimal use of low RDS(ON) MOSFETs, eliminating the need for external heatsinks even when delivering high output currents.

Differential sensing enables accurate control of the output voltage, while adaptive voltage positioning provides optimum transient response. An internal regulator enables operation with input voltage ranges of +4.75V to +5.5V or +8V to +28V. The high switching frequency, up to 500kHz per phase, and dual-phase operation allow the use of low-output inductor values and input capacitor values. This accommodates the use of PC board embedded planar magnetics achieving superior reliability, current sharing, thermal management, compact size, and low system cost.

Features

♦ +4.75V to +5.5V or +8V to +28V Input Voltage Range

♦ Adjustable VOUT

   +0.6V to +3.3V (MAX5065)

   +0.8V to +3.3V (MAX5067)

♦ Up to 60A Output Current

♦ Internal Voltage Regulator for a +12V or +24V Power Bus

♦ Programmable Adaptive Output Voltage Positioning

♦ True Differential Remote Output Sensing

♦ Out-of-Phase Controllers Reduce Input

   Capacitance Requirement and Distribute Power

   Dissipation

♦ Average-Current-Mode Control

   Superior Current Sharing Between Individual

   Phases and Paralleled Modules

   Accurate Current Limit Eliminates MOSFET and

   Inductor Derating

♦ Limits Reverse-Current Sinking in Paralleled Modules

♦ Integrated 4A Gate Drivers

♦ Selectable Fixed Frequency 250kHz or 500kHz Per

   Phase (Up to 1MHz for Two Phases)

♦ External Frequency Synchronization from 125kHz to 600kHz

♦ Internal PLL with Clock Output for Paralleling

   Multiple DC-DC Converters

♦ Thermal Protection

♦ 28-Pin SSOP Package (MAX5065)

♦ 44-Pin Thin QFN Package (MAX5067)

Applications

   Servers and Workstations

   Point-of-Load High-Current/High-Density Telecom DC-DC Regulators

   Networking Systems

   Large-Memory Arrays

   RAID Systems

   High-End Desktop Computers