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EVB-EP5357LUI Datasheet(PDF) 10 Page - Altera Corporation |
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EVB-EP5357LUI Datasheet(HTML) 10 Page - Altera Corporation |
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10 / 19 page  EP5357LUI/EP5357HUI Detailed Description Functional Overview The EP5357xUI requires only 2 small MLCC capacitors for a complete DC-DC converter solution. The device integrates MOSFET switches, PWM controller, Gate-drive, compensation, and inductor into a tiny 2.5mm x 2.25mm x 1.1mm QFN package. Advanced package design, along with the high level of integration, provides very low output ripple and noise. The EP5357xUI uses voltage mode control for high noise immunity and load matching to advanced ≤90nm loads. A 3-pin VID allows the user to choose from one of 8 output voltage settings. The EP5357xUI comes with two VID output voltage ranges. The EP5357HUI provides VOUT settings from 1.8V to 3.3V, the EP5357LUI provides VID settings from 0.8V to 1.5V, and also has an external resistor divider option to program output setting over the 0.6V to VIN-0.25V range. The EP5357xUI provides the industry’s highest power density of any 600mA DCDC converter solution. The key enabler of this revolutionary integration is Altera Enpirion’s proprietary power MOSFET technology. The advanced MOSFET switches are implemented in deep- submicron CMOS to supply very low switching loss at high switching frequencies and to allow a high level of integration. The semiconductor process allows seem-less integration of all switching, control, and compensation circuitry. The proprietary magnetics design provides high-density/high-value magnetics in a very small footprint. Altera Enpirion magnetics are carefully matched to the control and compensation circuitry yielding an optimal solution with assured performance over the entire operating range. Protection features include under-voltage lock- out (UVLO), over-current protection (OCP), short circuit protection, and thermal overload protection. Integrated Inductor The EP5357xUI utilizes a proprietary low loss integrated inductor. The integration of the inductor greatly simplifies the power supply design process. The inherent shielding and compact construction of the integrated inductor reduces the conducted and radiated noise that can couple into the traces of the printed circuit board. Further, the package layout is optimized to reduce the electrical path length for the high di/dT input AC ripple currents that are a major source of radiated emissions from DC-DC converters. The integrated inductor provides the optimal solution to the complexity, output ripple, and noise that plague low power DCDC converter design. Voltage Mode Control The EP5357xUI utilizes an integrated type III compensation network. Voltage mode control is inherently impedance matched to the sub 90nm process technology that is used in today’s advanced ICs. Voltage mode control also provides a high degree of noise immunity at light load currents so that low ripple and high accuracy are maintained over the entire load range. The very high switching frequency allows for a very wide control loop bandwidth and hence excellent transient performance. Light Load Mode (LLM) Operation The EP5357xUI uses a proprietary light load mode to provide high efficiency in the low load operating condition. When the LLM pin is high, the device is in automatic LLM/PWM mode. When the LLM pin is low, the device is in PWM mode. In automatic LLM/PWM mode, when a light load condition is detected, the device will (1) step VOUT up by approximately 1.5% above the nominal operating output voltage setting, VNOM, and then (2) shut down unnecessary circuitry, and (3) monitor VOUT. When VOUT falls below VNOM, the device will repeat (1), (2), and (3). The voltage step up, or pre-positioning, improves transient droop when a load transient causes a transition from LLM mode to PWM mode. If a load transient occurs, causing VOUT to fall below the threshold VMIN, the device will 10 www.altera.com/enpirion 03409 October 11, 2013 Rev E |
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