General Description

The MAX15034 two-phase, configurable single- or dual output buck controller has an input voltage range of 4.75V to 5.5V or 5V to 28V. A mode select input allows for a dual-output supply or connecting two phases together for a single-output, high-current supply. Each output channel of the MAX15034 drives n-channel MOSFETs and is capable of providing more than 25A of load current. The MAX15034 uses average currentmode control with a switching frequency up to 1MHz per phase where each phase is 180° out of phase with respect to the other. Out-of-phase operation results in significantly reduced input capacitor ripple current and output voltage ripple in dual-phase, single-output voltage applications. Each controller has its own high-performance current and voltage-error amplifier that can be compensated for optimum output filter L-C values and transient response.

Features

♦ 4.75V to 5.5V or 5V to 28V Input
♦ Dual-Output Synchronous Buck Controller
♦ Configurable for Two Separate Outputs (25A) or One Single Output (50A)
♦ Average Current-Mode Control with Accurate Adjustable Current Limit
♦ 180° Interleaved Operation Reduces Size of Input Filter Capacitors
♦ Limits Reverse Current Sinking When Operated in Parallel Mode
♦ Each Output is Adjustable from 0.61V to 5.5V
♦ Independently Programmable Adaptive Voltage Positioning
♦ Monotonic Startup into Prebiased Outputs
♦ Independent Shutdown for Each Output
♦ 100kHz to 1MHz per Phase Programmable Switching Frequency
♦ Oscillator Frequency Synchronization from 200kHz to 2MHz
♦ Digital Soft-Start on Outputs
♦ Hiccup-Mode Overcurrent Protection
♦ Overtemperature Shutdown
♦ Thermally Enhanced 28-Pin TSSOP Package Capable of Dissipating 2.1W

Applications

High-End Computers/Workstations/Servers
Graphics Cards
Networking Systems
Point-of-Load High-Current/High-Density Telecom DC-DC Regulators
RAID Systems