LTM4654

• ±3% Output Voltage Accuracy Over Temperature
• Clock Output for a Multiphase Operation
• Power Good Output Signal
• Short-Circuit Protection
• Monotonic Output Voltage Startup
• Optional External Reference
• Undervoltage Lockout (UVLO)
• Internal Charge Balance Circuitry

The EVAL-LTM4654-AZ evaluation board features the LTM^®4654, a high-efficiency, high-power-density, bi-directional hybrid power μModule^® (micromodule) converter. The EVAL-LTM4654-AZ can deliver 12V at 25A with an input voltage range of 36V to 55V (up to 57V during transients).

The LTM4654 uses an architecture that merges soft switching in a Switched capacitor (SC) topology with a traditional step-down converter to provide superior efficiency compared to traditional switching architectures. The LTM4654 offers a high-efficiency, high-density, and cost-effective solution for non-isolated intermediate bus applications for power distribution, datacom centers, and telecom applications.

The LTM4654’s current mode control architecture can parallel multiple LTM4654 modules to operate in a multiphase configuration with excellent current sharing and low output voltage ripple to enable much higher power applications. Low electromagnetic interference (EMI) emissions and reduced Metal-oxide-semiconductor field-effect transistor (MOSFET) stress can be achieved with the soft switching front end.

The LTM4654 design eliminates the inrush current typically associated with SC circuits by pre-balancing the capacitors on startup.

The LTM4654 monitors the system voltage, current, and temperature faults. It stops switching and pulls the FAULT pin low when a fault condition occurs. An onboard timer sets the appropriate restart or retry times.

The LTM4654 data sheet must be used in conjunction with this evaluation board user guide.