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2SNVU623B–October 2018–Revised April 2020
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LM5143-Q1 EVM User's Guide
Contents
1 High Density EVM Description............................................................................................. 4
1.1 Typical Applications ................................................................................................ 4
1.2 Features and Electrical Performance ............................................................................ 4
2 EVM Characteristics......................................................................................................... 5
3 Application Circuit Diagram................................................................................................. 6
4 EVM Photo.................................................................................................................... 7
5 Test Setup and Procedure.................................................................................................. 8
5.1 EVM Connections................................................................................................... 8
5.2 Test Equipment ..................................................................................................... 9
5.3 Recommended Test Setup........................................................................................ 9
5.4 Test Procedure .................................................................................................... 10
6 Test Data and Performance Curves ..................................................................................... 10
6.1 Conversion Efficiency............................................................................................. 10
6.2 Operating Waveforms ............................................................................................ 14
6.3 Bode Plots.......................................................................................................... 19
6.4 Thermal Performance............................................................................................. 20
6.5 CISPR 25 EMI Performance..................................................................................... 20
7 EVM Documentation....................................................................................................... 21
7.1 Schematic .......................................................................................................... 21
7.2 Bill of Materials .................................................................................................... 22
7.3 PCB Layout ........................................................................................................ 24
7.4 Component Drawings............................................................................................. 27
8 Device and Documentation Support .................................................................................... 28
8.1 Device Support ................................................................................................... 28
8.2 Documentation Support .......................................................................................... 28
List of Figures
1 LM5143-Q1 Dual Synchronous Buck Regulator Simplified Schematic............................................... 6
2 LM5143-Q1 Single-Output, Two-Phase Synchronous Buck Regulator Simplified Schematic..................... 6
3 LM5143-Q1 EVM, 100 mm × 75 mm ..................................................................................... 7
4 EVM Test Setup ............................................................................................................. 8
5 Dual-Channel Efficiency, VIN = 12 V, VOUT1 = 3.3 V, VOUT2 = 5 V ..................................................... 10
6 Ch1 Efficiency, VIN = 12 V, VOUT1 = 3.3 V, FPWM, Channel 2 OFF.................................................. 11
7 Ch1 Efficiency, VIN = 12 V, VOUT1 = 3.3 V, Diode Emulation, Channel 2 OFF (Log Scale)........................ 11
8 Ch2 Efficiency, VIN = 12 V, VOUT2 = 5 V, FPWM, Channel 1 OFF .................................................... 12
9 Ch2 Efficiency, VIN = 12 V, VOUT2 = 5 V, Diode Emulation, Channel 1 OFF (Log Scale).......................... 12
10 Two-Phase Regulator Efficiency, VOUT = 5 V, FPWM ................................................................. 13
11 Two-Phase Regulator Efficiency, VOUT = 3.3 V, FPWM ............................................................... 13
12 SW Node Voltages, VIN = 12 V, IOUT1 = IOUT2 = 7 A...................................................................... 14
13 SW Node Voltages, VIN = 8 V, IOUT1 = IOUT2 = 7 A....................................................................... 14
14 Ch1 (3.3 V) Load Transient Response, VIN = 12 V, FPWM, 0 A to 7 A at 1 A/µs ................................. 15
15 Ch1 (3.3 V) Load Transient Response, VIN = 12 V, FPWM, 3.5 A to 7 A at 1 A/µs............................... 15
16 Ch2 (5 V) Load Transient Response, VIN = 12 V, FPWM, 0 A to 7 A at 1 A/µs ................................... 16
17 Ch2 (5 V) Load Transient Response, VIN = 12 V, FPWM, 3.5 A to 7 A at 1 A/µs ................................. 16
18 Cold-crank Response to VIN = 3.8 V, IOUT1 = IOUT2 = 1 A ............................................................... 17
19 ENABLE ON and OFF, VIN = 12 V, IOUT1 = IOUT2 = 7 A Resistive, CSS1 = CSS2 = 68 nF ............................. 17
20 Startup, VIN = 12 V, IOUT1 = IOUT2 = 7 A Resistive, CSS1 = CSS2 = 68 nF................................................ 18
21 Shutdown, VIN = 12 V, IOUT1 = IOUT2 = 7 A Resistive..................................................................... 18
22 Bode Plot, VIN = 12 V, VOUT1 = 3.3 V, IOUT1 = 7 A Resistive............................................................ 19
23 Bode Plot, VIN = 12 V, VOUT2 = 5 V, IOUT2 = 7 A Resistive .............................................................. 19
24 Thermal Performance, VIN = 12 V, IOUT1 = IOUT2 = 7 A, Free Convection Airflow.................................... 20