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Summary of Contents for Microsemi LX7180A
- Page 1 LX7180A User Guide LX7180A 4 Amp Step-Down Converter Evaluation Board...
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Page 2: Table Of Contents
7 Bill of Materials ..........................10 8 Efficiency Plot ..........................11 9 Dynamic Load Response Scope Shots ..................12 10 Start-up and Short Condition Scope Shots ................. 15 11 Ordering Information ........................17 Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0... -
Page 3: Revision History
The revision history describes the changes that were implemented in the document. The changes are listed by revision, starting with the most current publication. Revision 1.0 This document was published in November 2017. It was the first publication of this document. Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0... -
Page 4: Product Description
0.6 V to 1.195 V through a high speed (up to 3.4 MHz), bi- directional I C bus. The LX7180A operates from 3 V to 5.5 V rails and outputs 0.6 V to 100% of the input voltage. Cycle-by-cycle current limiting protects against over-current conditions. Hiccup mode provides protection for heavy over-load or short-circuit faults. -
Page 5: Evaluation Board Schematic
LX7180A 4 Amp Step-Down Converter Evaluation Board Evaluation Board Schematic The following illustration shows the evaluation board schematic. Figure 1 • Evaluation Board Schematic Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0... -
Page 6: Basic Connection Instructions
Figure 2 • Power Supply and Load Connection with I²C Implemented The following illustration shows how to connect the board to the power supply without I C. Figure 3 • Power Supply and Load Connection Without I²C Implemented Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0... -
Page 7: Recommended Operating Conditions
R1 and R2. is determined by the chip. For example, to set the LX7180A to a VOUT= 1.8 V, given V = 0.6 V, first pick the lower resistor R2= 120K, calculate the upper resistor R1= 240K. -
Page 8: Pcb Layout Of Evaluation Board
LX7180A 4 Amp Step-Down Converter Evaluation Board PCB Layout of Evaluation Board The LX7180A evaluation board is a four-layer board. The recommended distance between ground layer and the top layer is 6 mil. The following illustrations depict each of the board's four layers. - Page 9 LX7180A 4 Amp Step-Down Converter Evaluation Board Figure 5 • Layer 2: Ground Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0...
- Page 10 LX7180A 4 Amp Step-Down Converter Evaluation Board Figure 6 • Layer 3: Sense Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0...
- Page 11 LX7180A 4 Amp Step-Down Converter Evaluation Board Figure 7 • Layer 4: Bottom Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0...
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Page 12: Bill Of Materials
VIN, VOUT, GND, GND Jumper/4 pin 10 μF/10 V/10%/0805/X5R C1, C6 47 μF Electronic/35V 22 μF/6.3 V/10%/0805/X5R 500 kΩ/1%/0402 100 kΩ/1%/0402 0 Ω/1%/0402 R4, R8 10 kΩ/1%/0402 R6, R7 0.47 μH – IHLP2020CZERR47MO Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0... -
Page 13: Efficiency Plot
LX7180A 4 Amp Step-Down Converter Evaluation Board Efficiency Plot The following graph shows the efficiency of the LX7180A at a voltage output of 1 V. Figure 8 • Efficiency Plot Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0... -
Page 14: Dynamic Load Response Scope Shots
LX7180A 4 Amp Step-Down Converter Evaluation Board Dynamic Load Response Scope Shots The following illustrations show the dynamic load response for the evaluation board. Figure 9 • Step Response Note: CH2: VOUT, CH4: I LOAD Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0... - Page 15 LX7180A 4 Amp Step-Down Converter Evaluation Board Figure 10 • Step Response Rising Edge Note: CH2: VOUT, CH3: SW Node, CH4: I LOAD Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0...
- Page 16 LX7180A 4 Amp Step-Down Converter Evaluation Board Figure 11 • Step Response Falling Edge Note: CH2: VOUT, CH3: SW Node, CH4: I LOAD Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0...
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Page 17: Start-Up And Short Condition Scope Shots
LX7180A 4 Amp Step-Down Converter Evaluation Board Start-up and Short Condition Scope Shots The following illustrations show the scope shots for the LX7180A. Figure 12 • Start-up With ENABLE Toggled Note: CH1: PG, CH2: EN, CH3: V , CH4: inductor current. - Page 18 LX7180A 4 Amp Step-Down Converter Evaluation Board Figure 13 • Soft-Start VIN Tied to ENABLE Note: CH1: PG, CH3: V , CH4: inductor current. Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0...
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Page 19: Ordering Information
"x" stands for the 2 LSB bits of the binary I C slave address (0 to 3), and "y" is the set output voltage (0 is 0.6 V, 1 is 0.9 V, 2 is 0.95 V, and 3 is 0.97 V). Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0... - Page 20 Microsemi. It is the Buyer's responsibility to independently determine suitability of any products and to test and verify the same. The information provided by Microsemi hereunder is provided "as is, where is" and with all faults, and the Microsemi Corporate Headquarters entire risk associated with such information is entirely with the Buyer.
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