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LX7165 EVAL BOARD USER GUIDE

Microsemi

Analog Mixed Signal Group

One Enterprise Aliso Viejo, CA 92656 USA (800) 713-4113, (949) 380-6100

Page 9

Copyright



2012

Rev. 0.1, 2013-10-23

Rev. 1.0, 2013-10-23

Figure 7 Layer 1: Top Layer

Figure 8 Layer 2: Ground Layer

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Summary of Contents for LX7165

Page 1: ...RD USER GUIDE Microsemi Analog Mixed Signal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Copyright 2012 Rev 0 2 2013 10 23 LX7165 EVALUATION BOARD USER GUIDE LX7165 5 Amp Step Down Converter ...

Page 2: ...0 23 Table of Contents Introduction to Product 1 Key Features 2 Applications 2 Part Specific Information 3 Evaluation Board Schematic 3 Basic Connection Instructions 4 LX7165 I2 C GUI 5 Recommended Operating Conditions 6 PCB Layout of Evaluation Board 7 Bill of Material 11 Efficiency Plot 12 Dynamic Load Response Scope Shots 13 Start up Scope Shots 16 Dimax Sub20 Installation 20 ...

Page 3: ...us correction to sudden line load transients It does not require high ESR output capacitors and incorporates energy saving PSM Power Saving or Pulse Skip Mode at light loads to extend battery life in mobile applications The LX7165 has an I2 C serial interface port for output voltage margining and monitoring if required it can operate in default mode too It includes robust fault monitoring function...

Page 4: ... Extremely Fast Line Load Transient Response I2 C for Output Adjustment 3 4Mbps 1 875MHz Switching Frequency Extremely Low RDSON MOSFETS Input Voltage Rail 3 3V to 5V Current 5A Programmable Power Save Mode for Light Load Efficiency UVLO OVP OCP 0 C to 85 C Ambient Temperature Available in WLCSP 20 0 4mm pitch RoHS Compliant Applications High Performance HDD LCD TV s Notebook Netbook Server and Wo...

Page 5: ...3 10 23 Part Specific Information IC Part Number Description LX7165 xyCSP WLCSP 20Ball 0 4mm Pitch Note x is the 2 LSB bits of the binary I2 C slave address 0 to 3 y is the set output voltage 0 is 0 6V 1 is 0 9V 2 is 0 95V 3 is 0 97V Evaluation Board Part Number Description LX7165 EVAL BOARD Evaluation PCB for LX7165 Evaluation Board Schematic Figure 1 Schematic of Evaluation Board ...

Page 6: ...rise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 4 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Basic Connection Instructions Figure 2 Power Supply and Load Connection with I2 C Implemented Figure 3 Power Supply and Load Connection without I2 C Implemented ...

Page 7: ...LX7165 I2 C GUI is a graphic user interface that can read write IC status or change default settings via I2 C serial portal For example it can used to enable disable device change output voltage or enable power saving mode etc More information about register map and I2 C function can be found in LX7165 datasheet Note To use this GUI a SUB 20 USB I2 C adaptor is needed See Dimax SUB 20 and LX7165 G...

Page 8: ... circuitry is still active and maybe programmed Setting the Output Voltage Only use I2 C interface can adjust VOUT from 0 6V to 1 2V When I2 C interface is implemented the reference voltage is programmed with the I2 C bus VSEL register value Where NSEL is the decimal value of the 7 VSEL bits In case a higher output voltage is needed it must be programmed through an external resistor divider connec...

Page 9: ...AL Board is a 4 layer board the thickness of the board is 63mil in total The second layer to top layer is 7mil the third layer to the bottom layer is 7mil There s no microvias or blind vias needed each signal can leave the LX7165 directly without using any via under the device And it can lower the ESL with the bypass capacitors C2 C3 and C9 implemented C4 is only needed when there s long wires con...

Page 10: ... EVAL BOARD USER GUIDE Microsemi Analog Mixed Signal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 8 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Figure 6 Top Silkscreen ...

Page 11: ...GUIDE Microsemi Analog Mixed Signal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 9 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Figure 7 Layer 1 Top Layer Figure 8 Layer 2 Ground Layer ...

Page 12: ...IDE Microsemi Analog Mixed Signal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 10 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Figure 9 Layer 3 Sense Layer Figure 10 Layer 4 Bottom Layer ...

Page 13: ...ference Qty 1 Microsemi IC LX7165 U1 1 2 Test Point SW PGOOD VIN_S VO_S GND_S GND_S 6 3 Terminal VIN VOUT GND GND 4 4 Jumper 3pin JP2 1 5 Jumper 4pin J2 1 CAPACITORS Item Part Description Reference Qty 6 1uF C2 1 7 22uF 10V X5R C3 C8 2 8 47uF Electronic C4 1 9 22uF 6 3V X5R C5 C6 C7 3 RESISTORS Item Part Description Reference Qty 10 0 R1 R4 2 11 100kOhm R3 1 12 10kOhm R5 R6 2 INDUCTOR Item Part De...

Page 14: ...56 USA 800 713 4113 949 380 6100 Page 12 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Efficiency Plot Figure 11 Efficiency Plot of LX7165 03CSP 0 00 10 00 20 00 30 00 40 00 50 00 60 00 70 00 80 00 90 00 100 00 10 100 1000 Efficiency Load Current mA LX7165 03CSP Vout 0 97V Efficiency PWM PSM ...

Page 15: ...terprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 13 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Dynamic Load Response Scope Shots Dynamic load response with 0 5 2 5A load Figure 12 Dynamic Load Response with 0 5 2 5A Load CH2 VOUT CH4 Load Current ...

Page 16: ...Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 14 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Dynamic load response with 0 5 2 5A load Rising Edge Figure 13 Dynamic Load Response Rising Edge with 0 5 2 5A Load CH2 VOUT CH3 SW CH4 Load Current ...

Page 17: ...nterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 15 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Dynamic load response with 0 5 2 5A load Falling Edge Figure 14 Dynamic Load Response Falling Edge with 0 5 2 5A Load CH2 VOUT CH3 SW CH4 Load Current ...

Page 18: ...ixed Signal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 16 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Start up Scope Shots Start up with ENABLE toggled Figure 15 Startup with ENABLE toggled CH2 EN CH3 VOUT ...

Page 19: ...emi Analog Mixed Signal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 17 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Soft Start with VIN tied to EN Figure 16 Soft start VIN tied to ENABLE CH3 VOUT ...

Page 20: ...ignal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 18 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Start up when VIN 4 5V Load 0 5Ohm Figure 17 Start Up When Vin 4 5V Load 0 5ohm CH1 PG CH3 VOUT CH4 Inductor Current ...

Page 21: ... Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 19 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Start up when VIN 4 5V Load 0 5Ohm Rising Edge Figure 18 Zoomed in Rising Edge of Start Up When VIN 4 5V Load 0 5ohm CH3 VOUT CH4 Inductor Current ...

Page 22: ...ter auto search for driver 4 Firmware update The SUB 20 firmware version should be 0 3 5 Open Firmware updater tool The Firmware updater tool has a shortcut on the desktop It may also be found at Start Programs SUB 20 Firmware updater 5 Follow the instructions in the following link SUB 20 Firmware Update 6 Connect the adaptor according to the following connection 4 PIN to 9PIN cable connects LX716...

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