LTM4660

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.

The LTM4660 data sheet must be used in conjunction with this demo board manual.

Demonstration circuit 2959A-A is a high efficiency, high power density hybrid step-down converter. It can deliver 12V/50A with an input voltage from 36V to 60V (up to 65V during transients). This demo board features PolyPhase® design using the LTM®4660, 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.

The LTM4660 on DC2959A-A always operates in continuous conduction mode. The switching frequency can be programmed through a resistor or can be synchronized to an external clock signal. Due to its current mode control architecture, excellent current sharing and low output voltage ripple are achievable in the multiphase configuration. Other benefits include low EMI emissions due to a soft-switched front end and reduced MOSFET stress.

The LTM4660 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 power good output signal, short-circuit protection, monotonic output voltage start-up, optional external reference, undervoltage lockout, and internal charge balance circuitry.

The LTM4660 data sheet must be used in conjunction with this demo board manual.

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Demonstration circuit 2959A-B is a high efficiency, high power density hybrid step-down converter. It can deliver 12V/75A with an input voltage from 36V to 60V (up to 65V during transients). This demo board features PolyPhase^® design using 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.

The LTM4660 on DC2959A-B always operates in continuous conduction mode. The switching frequency can be programmed through a resistor or can be synchronized to an external clock signal. Due to its current mode control architecture, excellent current sharing and low output voltage ripple are achievable in the multiphase configuration. Other benefits include low EMI emissions due to a soft-switched front end and reduced MOSFET stress.

The LTM4660 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 power good output signal, short-circuit protection, monotonic output voltage start-up, optional external reference, undervoltage lockout, and internal charge balance circuitry.

The LTM4660 data sheet must be used in conjunction with the demo board manual.

Demonstration circuit 2959A-C is a high-efficiency, high-power-density hybrid step-down converter. It can deliver 12V/100A with an input voltage from 36V to 60V (up to 65V during transients). This demo board features PolyPhase® design using the LTM®4660, 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.

The LTM4660 on DC2959A-C always operates in continuous conduction mode. The switching frequency can be programmed through a resistor or can be synchronized to an external clock signal. Due to its current mode control architecture, excellent current sharing and low output voltage ripple are achievable in the multiphase configuration. Other benefits include low Electromagnetic Interference (EMI) emissions due to a soft-switched front end and reduced MOSFET stress.

The LTM4660 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 power good output signal, short-circuit protection, monotonic output voltage start-up, optional external reference, undervoltage lockout, and internal charge balance circuitry.

The LTM4660 data sheet must be used in conjunction with this demo board manual.

• Designed to be used for 48V Power Systems as the 48V offers a higher power density.
• Integrated solution for hot-swap applications allowing a board to be safely inserted and removed from a live backplane.
• Ease in design as it uses micro modules that will utilize few external components
• High power and low voltage capability for FPGAs, microcontrollers, etc.

The AD-PS0005-RD reference design provides a comprehensive power solution for 48V systems, featuring multiple outputs and a hot-swappable capability for enhanced reliability and flexibility.

This system board integrates the following key components: LTC4286, a high-power positive hot-swap controller; LTM4660, a 60V/300W hybrid step-down µModule® bus converter that delivers the 12V output; LTM4681, a quad 31.25A µModule regulator with an advanced digital power management system; and LTM4655, a 40V dual 4A step-down or 50W inverting µModule regulator for versatile power conversion.

APPLICATIONS

• 48V Bench Test Equipment
• 48V System Data Center
• Microcontrollers and FPGAs