Texas Instruments LM5123EVM-BST User manual

User’s Guide
LM5123EVM-BST Evaluation Module
ABSTRACT
The LM5123EVM-BST evaluation module showcases the features and performance of the LM5123-Q1 wide
input voltage synchronous boost controller. The standard configuration is designed to provide a regulated output
of 24-V at 200-W, from an input voltage of 8-V to 18-V and switching at 440 kHz. The output voltage can be
dynamically up to 33-V using the TRK pin of the LM5123-Q1.
This EVM is designed for ease of configuration, enabling an user to evaluate many different applications on
the same module. Functionality includes: low IQ operation, internal feedback resistors, bypass mode operation
when VIN is greater than VOUT, dynamic output voltage tracking, power good (PGOOD) indicator, programmable
frequency dithering, programmable undervoltage lock out (UVLO), and overvoltage protection.
Table of Contents
1 Introduction.............................................................................................................................................................................3
1.1 Applications........................................................................................................................................................................3
1.2 Features............................................................................................................................................................................. 3
2 EVM Setup............................................................................................................................................................................... 4
2.1 EVM Characteristics...........................................................................................................................................................5
2.2 EVM Connectors and Test Points...................................................................................................................................... 5
2.3 EVM Configurations........................................................................................................................................................... 7
3 Test Setup and Procedures....................................................................................................................................................8
3.1 Equipment.......................................................................................................................................................................... 8
4 Test Results.............................................................................................................................................................................9
4.1 Efficiency ...........................................................................................................................................................................9
4.2 Load Regulation .............................................................................................................................................................. 10
4.3 Thermal Performance...................................................................................................................................................... 10
4.4 Start-up Waveforms..........................................................................................................................................................11
4.5 Steady State Operation.................................................................................................................................................... 11
4.6 Load Transient Response................................................................................................................................................ 12
4.7 Output Voltage Tracking...................................................................................................................................................13
5 PCB Layers............................................................................................................................................................................14
6 Schematic..............................................................................................................................................................................16
7 Bill of Materials..................................................................................................................................................................... 17
8 Revision History................................................................................................................................................................... 21
List of Figures
Figure 1-1. Typical Application Circuit......................................................................................................................................... 3
Figure 2-1. EVM Photo................................................................................................................................................................ 4
Figure 2-2. Fixed Output Voltage Configuration.......................................................................................................................... 7
Figure 2-3. Variable Output Voltage Configuration ..................................................................................................................... 7
Figure 3-1. EVM Test Setup.........................................................................................................................................................8
Figure 4-1. Efficiency: VOUT = 24-V............................................................................................................................................. 9
Figure 4-2. Efficiency: VOUT = 24-V Light Load............................................................................................................................9
Figure 4-3. 24-V Load Regulation..............................................................................................................................................10
Figure 4-4. Thermal Performance: VIN = 8-V, VOUT = 24-V POUT = 200-W, No Forced Airflow................................................. 10
Figure 4-5. VIN = 8-V, VOUT = 24-V, POUT = 200-W.................................................................................................................... 11
Figure 4-6. VIN = 10-V, VOUT = 24-V, POUT = 200-W.................................................................................................................. 11
Figure 4-7. VIN = 14-V, VOUT = 24-V, POUT = 200-W.................................................................................................................. 11
Figure 4-8. VIN = 18-V, VOUT = 24-V, POUT = 200-W.................................................................................................................. 11
Figure 4-9. VIN = 8-V, VOUT = 24-V, POUT = 200-W.................................................................................................................... 11
Figure 4-10. VIN = 10-V, VOUT = 24-V, POUT = 200-W................................................................................................................ 11
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Figure 4-11. VIN = 14-V, VOUT = 24-V, POUT = 200-W................................................................................................................ 12
Figure 4-12. VIN = 18-V, VOUT = 24-V, POUT = 200-W................................................................................................................12
Figure 4-13. VIN = 8-V, IOUT = 4-A to 8-A................................................................................................................................... 12
Figure 4-14. VIN = 10-V, IOUT = 4-A to 8-A................................................................................................................................. 12
Figure 4-15. VIN = 14-V, IOUT = 4-A to 8-A................................................................................................................................. 12
Figure 4-16. VIN = 18-V, IOUT = 4-A to 8-A................................................................................................................................. 12
Figure 4-17. Triangle Voltage Tracking, VIN = 14-V, POUT = 200-W, VOUT 14-V to 33-V............................................................13
Figure 4-18. Sine Voltage Tracking, VIN = 14-V, POUT = 200-W, VOUT 14-V to 33-V................................................................. 13
Figure 5-1. Layout: Top Silk Screen...........................................................................................................................................14
Figure 5-2. Layout: Top Layer....................................................................................................................................................14
Figure 5-3. Layout: Signal Layer 1.............................................................................................................................................14
Figure 5-4. Layout: Signal Layer 2.............................................................................................................................................14
Figure 5-5. Layout: Bottom Layer.............................................................................................................................................. 15
Figure 5-6. Layout: Bottom Silk Screen..................................................................................................................................... 15
Figure 6-1. Schematic................................................................................................................................................................16
List of Tables
Table 2-1. EVM Characteristics .................................................................................................................................................. 5
Table 2-2. Power Connections.....................................................................................................................................................5
Table 2-3. Programmable Jumper Connections.......................................................................................................................... 5
Table 2-4. Probe Points............................................................................................................................................................... 6
Table 7-1. Bill of Materials..........................................................................................................................................................17
Trademarks
All trademarks are the property of their respective owners.
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1 Introduction
The LM5123EVM-BST evaluation module is designed to evaluate the operation and performance of the
LM5123-Q1 low-IQ synchronous boost controller. The EVM operates over an input voltage range of 8-V to
18-V and can handle input transients up to 42-V. The EVM provides a 24-V output with a maximum power rating
of 200-W. The output voltage can be to 33-V while using the TRK pin of the LM5123-Q1. The EVM can be
used to evaluate the LM5123-Q1 for many applications. Figure 1-1 shows the standard application circuit for the
LM5123EVM-BST evaluation module.
HO
HB
SW
CSN
BIAS VCC
TRK
LO
RT
COMP
SS
CSP
PGND
AGND
UVLO
VOUT
VOUT
VIN
VIN
VIN
MODE
SYNC/DITHER
VREF
COUT
RSLM
RUVT
RUVB
RT
CVCC
4.7

F
CSS
QLS
QHS
CHB
CCOMP
RCOMP
CHF
RVREFT
RVREFB
470nF
LM5123
Figure 1-1. Typical Application Circuit
1.1 Applications
• Automotive audio power supply with tracking
• Automotive LED bias supply
• Automotive HVAC controller supply
• Automotive motor power supply
1.2 Features
The LM5123EVM-BST has the following features:
• Input voltage range from 8-V to 18-V
• Internal low leakage current high-impedance feedback resistors with programmable output voltage
• Operating frequency of 440 kHz with externally clock synchronization up or down by 20%
• Output voltage tracking using the TRK pin of the LM5123-Q1
– See Section 2.3.1 for more details on tracking
• Bypass mode operation when VIN is greater than VOUT
• Selectable forced-PWM (FPWM), Skip mode, or diode emulation using the MODE pin
• High power conversion efficiency across a wide operating range
– Full-load efficiency of greater then 97% at VIN = 14-V, VOUT = 24-V, POUT = 200-W
• Cycle-by-cycle peak current limiting
• Optional frequency dithering for improved EMI performance
• Power good indicator
• Programmable soft-start time
• Programmable line undervoltage lockout (UVLO)
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2 EVM Setup
Section 2 describes the operating conditions for the EVM, as well as the configuration points of the evaluation
module.
Figure 2-1. EVM Photo
CAUTION
Prolonged operation with low input at full power will cause heating of Q3 and Q2.
Board surface is hot. Do not touch! Contact may cause burns.
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2.1 EVM Characteristics
Table 2-1 details the EVM characteristics.
Table 2-1. EVM Characteristics
Parameter Test Condition MIN TYP MAX UNIT
INPUT VOLTAGE CHARACTERISITCS
Input Voltage Range Operation 814 36 V
UVLO voltage levels Turn-off 6V
Turn-on 7V
Input Current No load operation, VIN = 13.5 V, VOUT = 24V, J14 =
Open, UVLO = BIAS, R21 = Open
35 μA
OUTPUT CHARACTERISITICS
Output Voltage VTRK = 400 mV 24 V
VTRK = 550 mV 33 V
Output Power 200 W
SYSTEM CHARACTERISITCS
Switching Frequency 440 kHz
Full Load Efficiency VIN = 14V, VOUT = 24 V 97.6 %
2.2 EVM Connectors and Test Points
Section 2.2 describes the connection points of the evaluation module. Table 2-2 to Table 2-4 describe these
connections. Table 2-2 lists the power connections of the evaluation module. These connections are intended to
handle relatively large currents.
Table 2-2. Power Connections
Jumper Pin Description
J1 VIN+ Positive input voltage power for the evaluation module
J2 VOUT+ Positive output voltage power for the evaluation module
J4 GND Negative output voltage power for the evaluation module
J5 VIN- Negative input voltage power for the evaluation module
Table 2-3 lists the EVM jumpers and test points that configure the LM5123-Q1 as desired. These jumpers can
set different modes of operation or provide signals to different pins of the LM5123-Q1.
Table 2-3. Programmable Jumper Connections
Jumper Pins Description Default Connection
J7 Pin 1 to Pin 2 SYNC/DITHER/VH/CP is pulled to VCC through a 1-kΩ resistor
to enable the internal charge pump or enable the VCC hold up
functionality. This connection should not be made if the J10 is
populated
Pin 2 to Pin 3 SYNC/DITHER/VH/CP is pulled to AGND through a 1-kΩ
resistor to disable the internal charge-pump and VCC hold up
functionality
Open If using an external clock synchronization on J10, leave this
jumper open.
X
J9 VTRK_D PWM signal applied through a two stage low pass filter to the
TRK pin. R18 must be populated.
J10 Pin 1 to Pin 2 SYNC/DITHER/VH/CP pulled to ground disabling dithering,
internal charge-pump functionality and VCC hold up
functionality. Should not be populated when J7 is populated
between pin 1 and pin 2
X
Open Dithering is enabled. To synchronize to an external clock C33
should be removed.
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Table 2-3. Programmable Jumper Connections (continued)
Jumper Pins Description Default Connection
J11 Pin 1 to Pin 2 Bypass D1 to tie either the VIN or VOUT nets to the BIAS pin X
Open Either VIN or VOUT is supplied through D1 to the BIAS pin
J12 Pin 1 to Pin 2 VIN is supplied to the BIAS pin. This is the default connection X
Pin 2 to Pin 3 VOUT is supplied to the BIAS pin
J13 Pin 1 to Pin 2 Connect an auxiliary power supply can be used to supply
power to the BIAS pin. J11 should be open if this is populated
Pin 2 to Pin 3 Connect the VCC and VIN pin
Open X
J14 Pin 1 to Pin 2 Configures light load switching operation to be FPWM X
Pin 2 to Pin 3 Configures light load switching operation to be diode emulation
Open Configures light load switching operation to be skip
TP6 Positive input to the VAUX net
TP7 Negative input to the VAUX net
TP8 Positive input to the TRK pin of the LM5123-Q1
TP9 Negative input to the TRK pin of the LM5123-Q1
Table 2-4 indicates the dedicated voltage probe points of the EVM. These points are used to make
measurements on the EVM.
Table 2-4. Probe Points
Sense Point Name Description
TP1 VIN+ Sense point for the positive input voltage
TP2 VOUT+ Sense point for the positive output voltage
TP3 SW Sense point for the switch node of the boost
controller
TP4 GND Sense point for the negative output voltage
TP5 VIN- Sense point for the negative input voltage
J3 PGND Power ground connection
J6 PGND Power ground connection
J8 Probe point for many of the LM5123 control signals
1 BIAS
2 PGOOD
3 UVLO
4 COMP
5 SS
6 AGND
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2.3 EVM Configurations
Section 2.3 shows modifications outside of the default configuration that are used to further evaluate the
LM5123-Q1.
2.3.1 Output Voltage Tracking
Section 2.3.1describes how to setup the evaluation module for dynamic output voltage tracking.
The LM5123EVM-BST is typically configured to have fixed output voltage of 24 V. Figure 2-2 shows the resistor
divider connection from the REF pin to the TRK pin that sets the output voltage to 24 V. RVREFT is R24 and
RVREFB is R26 referring to the schematic.
TRK
AGND
VREF
RVREFT
RVREFB
LM5123
TRK
AGND
VREF
LM5123
CVREF
Figure 2-2. Fixed Output Voltage Configuration
To dynamically change the output voltage, RVREFT and RVEFB are removed and the TRK pin voltage is driven
directly to change the output voltage. See the data sheet for selecting the voltage range of the LM5123-Q1 and
setting the TRK pin voltage to produce the desired output voltage. Figure 2-3 shows the configuration to change
the output voltage dynamically. RSET is R25 in the schematic.
TRK
AGND
VREF
RSET
LM5123
+
±VTRK
CVREF
Figure 2-3. Variable Output Voltage Configuration
To recreate the waveforms in Section 4.7, RSET is set to be 24.9 kΩ and the TRK pin is driven between 400 mV
and 550 mV, setting the output voltage to 24 V and 33V respectively.
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3 Test Setup and Procedures
Figure 3-1 shows the required test setup to recreate the results found in Section 4.
Voltmeter 1
V
-VIN
Power Supply Ammeter 1
-+A-
IIN
Electronic Load
VOUT
+-
Ammeter 2
IOUT -
A
Voltmeter 2
V -
VOUT
Figure 3-1. EVM Test Setup
3.1 Equipment
The following test equipment is needed to test the LM5123EVM-BST as shown in Figure 3-1.
• Power supply: The input voltage source (VIN) should be a variable supply. The power supply should source
7-V to 36-V and be able to supply more than 30-A of current.
• Electronic Load: Load connected to the output of the evaluation module. The electronic load should be able
to dissipate 200-W at 24-V.
• Multimeters: For DC measurements
– Voltmeter 1 (VIN): Capable of measuring the input voltage range up to 18-V
– Voltmeter 2 (VOUT): Capable of measuring output voltage of 24-V
– Ammeter 1 (IIN): Capable of 30-A DC measurement. A shunt resistor may also be used to measure the
input current
– Ammeter 2 (IOUT): Capable of at least 10-A DC measurement
• Oscilloscope: minimum of 20-MHz bandwidth and 10x probes.
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4 Test Results
Section 4 covers the test results of the evaluation module.
4.1 Efficiency
Figure 4-1 shows the efficiency of the evaluation module when configured in FPWM switching mode.
IOUT (A)
Efficiency (%)
0 0.8 1.6 2.4 3.2 4 4.8 5.6 6.4 7.2 8
50
55
60
65
70
75
80
85
90
95
100
18V_EFF
14V_EFF
12V_EFF
10V_EFF
8V_EFF
Figure 4-1. Efficiency: VOUT = 24-V
Figure 4-2 shows the efficiency comparison between Skip switching mode and FPWM switching mode at light
loading conditions.
IOUT (A)
Efficiency (%)
0.001 0.021 0.041 0.061 0.081 0.1
0
20
40
60
80
100
SKIP MODE
FPWM MODE
Figure 4-2. Efficiency: VOUT = 24-V Light Load
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4.2 Load Regulation
Figure 4-3 shows the load regulation for a 24-V output.
IOUT (A)
Output Voltage (V)
0 1 2 3 4 5 6 7 8
23.6
23.7
23.8
23.9
24
24.1
24.2
24.3
24.4
VIN = 18V
VIN = 14V
VIN = 12V
VIN = 10V
VIN = 8V
Figure 4-3. 24-V Load Regulation
4.3 Thermal Performance
Figure 4-4. Thermal Performance: VIN = 8-V, VOUT = 24-V POUT = 200-W, No Forced Airflow
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4.4 Start-up Waveforms
Figure 4-5 through Figure 4-8 show the start-up waveforms of the LM5123EVM-BST.
Figure 4-5. VIN = 8-V, VOUT = 24-V, POUT = 200-W Figure 4-6. VIN = 10-V, VOUT = 24-V, POUT = 200-W
Figure 4-7. VIN = 14-V, VOUT = 24-V, POUT = 200-W Figure 4-8. VIN = 18-V, VOUT = 24-V, POUT = 200-W
4.5 Steady State Operation
Full load operation
Figure 4-9 through Figure 4-12 show the steady state waveforms of the LM5123EVM-BST.
Figure 4-9. VIN = 8-V, VOUT = 24-V, POUT = 200-W Figure 4-10. VIN = 10-V, VOUT = 24-V, POUT = 200-W
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Figure 4-11. VIN = 14-V, VOUT = 24-V, POUT = 200-W Figure 4-12. VIN = 18-V, VOUT = 24-V, POUT = 200-W
4.6 Load Transient Response
Figure 4-13 to Figure 4-16 show the load transient response of the evaluation module
Figure 4-13. VIN = 8-V, IOUT = 4-A to 8-A Figure 4-14. VIN = 10-V, IOUT = 4-A to 8-A
Figure 4-15. VIN = 14-V, IOUT = 4-A to 8-A Figure 4-16. VIN = 18-V, IOUT = 4-A to 8-A
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4.7 Output Voltage Tracking
Section 2.3.1 shows the output tracking using the TRK pin of the LM5123-Q1. To see more details on configuring
the evaluation module to replicate these waveforms, see Section 2.3.1.
Figure 4-17. Triangle Voltage Tracking, VIN = 14-V,
POUT = 200-W, VOUT 14-V to 33-V
Figure 4-18. Sine Voltage Tracking, VIN = 14-V, POUT
= 200-W, VOUT 14-V to 33-V
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5 PCB Layers
Figure 5-1 through Figure 5-6 illustrate the EVM PCB layout.
Figure 5-1. Layout: Top Silk Screen Figure 5-2. Layout: Top Layer
Figure 5-3. Layout: Signal Layer 1 Figure 5-4. Layout: Signal Layer 2
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Figure 5-5. Layout: Bottom Layer Figure 5-6. Layout: Bottom Silk Screen
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6 Schematic
Figure 6-1 illustrates the EVM schematic.
Figure 6-1. Schematic
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7 Bill of Materials
Table 7-1 details the EVM bill of materials.
Table 7-1. Bill of Materials
Designator Quantity Value Description Package Reference Part Number Manufacturer
C2 1 120µF Cap Aluminum Polymer 120uF 50VDC 20%
(8 X 12mm) SMD 0.025 Ohm 2100mA 4000h
135C Automotive T/R
RADIAL PCH1H121MCL2GS Nichicon
C3, C4, C5, C30, C31,
C32
6 150µF 150µF 50V Aluminum - Polymer Capacitors
17mOhm 4000 hrs @ 125°C
RADIAL EEH-ZS1H151P Panasonic
C6 1 1000pF CAP, CERM, 1000 pF, 50 V, +/- 10%, X7R,
0603
603 C0603X102K5RACTU Kemet
C7 1 0.1uF CAP, CERM, 0.1 uF, 50 V, ±10%, X7R, 0603 0603 C1608X7R1H104K080AA TDK
C8, C14 2 0.01uF CAP, CERM, 0.01 µF, 100 V,+/- 10%, X7R,
0603
603 8.85012E+11 Wurth Elektronik
C9, C10, C11, C12,
C13, C15, C16, C17,
C18
9 10uF CAP, CERM, 10 uF, 50 V, +/- 10%, X7R,
1210
1210 GRM32ER71H106KA12L MuRata
C19, C20, C21, C22,
C23, C35, C36
7 0.1uF CAP, CERM, 0.1 uF, 100 V,+/- 10%, X7R,
AEC-Q200 Grade 1, 0603
603 GCJ188R72A104KA01D MuRata
C20, C21, C22 3 4.7uF CAP, CERM, 4.7 uF, 100 V, ±10%, X7S,
AEC-Q200 Grade 1, 1210
1210 CGA6M3X7S2A475K200AB TDK
C24, C25, C26, C33 4 4.7uF CAP, CERM, 4.7 uF, 100 V, +/- 10%, X7S,
AEC-Q200 Grade 1, 1210
1210 CGA6M3X7S2A475K200AB TDK
C27 1 100pF CAP, CERM, 100 pF, 50 V, +/- 5%, C0G/NP0,
AEC-Q200 Grade 0, 0603
603 CGA3E2NP01H101J080AA TDK
C37 1 100pF CAP, CERM, 100 pF, 50 V,+/- 1%, C0G/NP0,
0603
603 C0603C101F5GACTU Kemet
C38 1 0.33uF CAP, CERM, 0.33 uF, 10 V, +/- 10%, X5R,
0603
603 C0603C334K8PACTU Kemet
C39, C40 2 0.22uF CAP, CERM, 0.22 uF, 50 V, +/- 10%, X7R,
AEC-Q200 Grade 1, 0603
603 CGA3E3X7R1H224K080AB TDK
C41, C42 2 6800pF CAP, CERM, 6800 pF, 50 V,+/- 5%, C0G/
NP0, 0603
603 GRM1885C1H682JA01D MuRata
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Table 7-1. Bill of Materials (continued)
Designator Quantity Value Description Package Reference Part Number Manufacturer
C43 1 47pF CAP, CERM, 47 pF, 100 V,+/- 5%, C0G/NP0,
AEC-Q200 Grade 1, 0603
603 C0603C470J1GACAUTO Kemet
C44 1 4.7uF CAP, CERM, 4.7 uF, 16 V, +/- 10%, X6S,
0603
603 C1608X6S1C475K080AC TDK
C45 1 470pF CAP, CERM, 470 pF, 50 V, +/- 5%, C0G/NP0,
0603
603 06035A471JAT2A AVX
D1 1 Diode Schottky 60 V 1A Surface Mount
SOD-123
SOD-123 PMEG6010CEGWX Nexperia
H1, H2, H3, H4 4 Machine Screw, Round, #4-40 x 1/4, Nylon,
Philips panhead
Screw NY PMS 440 0025 PH B&F Fastener Supply
H5, H6, H7, H8 4 Hex Standoff Threaded #4-40 Nylon 0.750"
(19.05mm) 3/4" Natural
HEX_STANDOFF 1902D_Ndrill Keystone Electronics
J1, J2, J3, J4 4 TERMINAL SCREW PC 30AMP, TH 12.9x6.3x7.9 mm 8199 Keystone
J5, J6 2 TEST POINT SLOTTED .118", TH Test point, TH Slot Test point 1040 Keystone
J7, J12, J13, J14 4 Header, 2.54 mm, 3x1, Gold, TH Header, 2.54mm, 3x1, TH 61300311121 Wurth Elektronik
J8 1 Header, 100mil, 7x1, Gold, TH 7x1 Header TSW-107-07-G-S Samtec
J9, J10, J11 3 Header, 2.54 mm, 2x1, Gold, TH Header, 2.54mm, 2x1, TH 61300211121 Wurth Elektronik
L1 1 2.6uH Inductor, Shielded Drum Core, WE-
Superflux200, 2.6 uH, 31.5 A, 0.0016 ohm,
SMD
18.3x8.9x18.2mm 7443556260 Wurth Elektronik
Q1, Q2, Q3, Q4 4 60V MOSFET, N-CH, 60 V, 71 A, SO-8FL SO-8FL NTMFS5C670NLT1G ON Semiconductor
R2, R3 2 0.003 RES, 0.003, 1%, 3 W, AEC-Q200 Grade 0,
2512 WIDE
2512 WIDE KRL6432E-M-R003-F-T1 Susumu Co Ltd
R4, R5, R7, R8, R9,
R10, R11, R16
7 0 RES, 0, 5%, 0.1 W, AEC-Q200 Grade 0,
0603
603 ERJ-3GEY0R00V Panasonic
R6 1 100 RES, 100, 1%, 0.1 W, 0603 603 RC0603FR-07100RL Yageo
R12 1 0 RES, 0, 5%, 0.1 W, 0603 603 RC0603JR-070RL Yageo
R14 1 100k RES, 100 k, 1%, 0.1 W, AEC-Q200 Grade 0,
0603
603 CRCW0603100KFKEA Vishay-Dale
R15 1 86.6k RES, 86.6 k, 1%, 0.1 W, 0603 603 RC0603FR-0786K6L Yageo
R17 1 1.00k RES, 1.00 k, 1%, 0.1 W, AEC-Q200 Grade 0,
0603
603 CRCW06031K00FKEA Vishay-Dale
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Table 7-1. Bill of Materials (continued)
Designator Quantity Value Description Package Reference Part Number Manufacturer
R19, R20 2 80.6k RES, 80.6 k, 1%, 0.1 W, AEC-Q200 Grade 0,
0603
603 CRCW060380K6FKEA Vishay-Dale
R21 1 18.7k RES, 18.7 k, 1%, 0.1 W, 0603 603 RC0603FR-0718K7L Yageo
R22 1 49.9k RES, 49.9 k, 1%, 0.1 W, AEC-Q200 Grade 0,
0603
603 ERJ-3EKF4992V Panasonic
R23 1 54.9k RES, 54.9 k, 1%, 0.1 W, AEC-Q200 Grade 0,
0603
603 CRCW060354K9FKEA Vishay-Dale
R24 1 21.0k RES, 21.0 k, 1%, 0.1 W, AEC-Q200 Grade 0,
0603
603 CRCW060321K0FKEA Vishay-Dale
R26 1 14.0k RES, 14.0 k, 0.5%, 0.1 W, 0603 603 RT0603DRE0714KL Yageo America
SH-J1, SH-J2, SH-J3,
SH-J4
4 Single Operation 2.54mm Pitch Open Top
Jumper Socket
Single Operation 2.54mm Pitch
Open Top Jumper Socket
M7582-05 Harwin
TP1, TP2, TP6, TP8 4 Test Point, Miniature, Red, TH Red Miniature Testpoint 5000 Keystone
TP3 1 Test Point, Miniature, SMT Testpoint_Keystone_Miniature 5015 Keystone
TP4, TP5, TP7, TP9 4 Test Point, Miniature, Black, TH Black Miniature Testpoint 5001 Keystone
U1 1 2.2-MHz Wide VIN Low-IQ Synchronous
Boost Controller with Tracking
VQFN20 LM5123QRGRRQ1 Texas Instruments
C1 0 2200pF CAP, CERM, 2200 pF, 100 V, +/- 10%, X7R,
0603
603 GRM188R72A222KA01D MuRata
C28, C29 0 0.1uF CAP, CERM, 0.1 uF, 100 V,+/- 10%, X7R,
AEC-Q200 Grade 1, 0603
603 GCJ188R72A104KA01D MuRata
C34 0 0.1uF CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R,
0603
603 C1608X7R1H104K080AA TDK
FID1, FID2, FID3,
FID4, FID5, FID6
0 Fiducial mark. There is nothing to buy or
mount.
N/A N/A N/A
L2 0 2uH Inductor, Shielded, Composite, 2 uH, 39.9 A,
0.001909 ohm, SMD
15.2x8x16.2mm XAL1580-202MEB Coilcraft
R1 0 2 RES, 2.00, 1%, 0.5 W, AEC-Q200 Grade 0,
1210
1210 ERJ-14BQF2R0U Panasonic
R13 0 100k RES, 100 k, 1%, 0.1 W, AEC-Q200 Grade 0,
0603
603 CRCW0603100KFKEA Vishay-Dale
www.ti.com Schematic
SNVU737A – DECEMBER 2020 – REVISED DECEMBER 2021
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LM5123EVM-BST Evaluation Module 19
Copyright © 2021 Texas Instruments Incorporated

Table 7-1. Bill of Materials (continued)
Designator Quantity Value Description Package Reference Part Number Manufacturer
R18 0 80.6k RES, 80.6 k, 1%, 0.1 W, AEC-Q200 Grade 0,
0603
603 CRCW060380K6FKEA Vishay-Dale
R25 0 24.9k RES, 24.9 k, 0.1%, 0.1 W, 0603 603 RT0603BRD0724K9L Yageo America
Schematic www.ti.com
20 LM5123EVM-BST Evaluation Module SNVU737A – DECEMBER 2020 – REVISED DECEMBER 2021
Submit Document Feedback
Copyright © 2021 Texas Instruments Incorporated