Analog Devices LTM4660 | Demoboard DC2879A

Description

Demonstration circuit 2879A is a high efficiency, high power density hybrid converter. It can deliver 12V/25A with an input voltage from 36V to 60V (up to 65V during transients). This demo board features the LTM4660, which uses an architecture that merges soft-switching switched capacitor topology with a traditional step-down converter to provide superior efficiency compared to the traditional switching architectures. It offers a high efficiency/high density and cost effective solution for nonisolated intermediate bus applications in power distribution, datacom and telecom.Due to its current mode control architecture, multiple LTM4660s can be operated in a parallel, multiphase configuration with excellent current sharing and low output voltage ripple to enable much higher power applications. Other benefits include low EMI emissions due to a soft-switched front end and reduced MOSFET stress.The LTM4660 design eliminates the inrush current typically associated with switched capacitor circuits by pre-balancing the capacitors on start-up. The LTM4660 also monitors system voltage, current and temperature for faults. It stops switching and pulls the FAULT pin low when a fault condition occurs. An onboard timer can be set for appropriate restart/retry times.Additional features include ±1.5% output voltage accuracy over temperature, a clock output for multiphase operation, a power good output signal, short-circuit protection, monotonic output voltage start-up, optional external reference, undervoltage lockout and internal charge balance circuitry.

Features

• Input Voltage Range: 30V to 60V (65V Abs. Max.)
• Wide Output Voltage: 4.5V to 18V (VOUT < VIN/2)
• 97.3% Peak Efficiency (12VOUT at 15A, 48VIN)
• ±1.5% Maximum Total DC Output Error
• Up to 300W Output Power
• Scalable: Parallel LTM4660s for Higher Power
• Fixed Frequency Current Mode Control
• Phase-Lockable External Synchronization from 200kHz to 1MHz
• Low Start-Up Inrush Current with Flying Capacitor Voltage-Balancing Prior to DC/DC Switching Action
• Output Voltage Tracking with Soft-Start
• Short-Circuit Protection with Adjustable Retry-Timer
• Overcurrent and Overtemperature Protection
• Onboard Diode Temperature Monitor
• Optional External Reference Input
• Power Good and FAULT Indicators
• 16mm × 16mm × 10.34mm BGA Package

Typical applications

• Industrial and Test Equipment
• Telecom, Data Centers and Networking Equipment

More information

• Datasheet
• IC product information