User's Guide
SNVA614B–January 2012–Revised January 2014
AN-2205 LM25118 Evaluation Board
1 Introduction
The LM25118 Evaluation Board is designed to provide the design engineer with a fully functional,
Emulated Current Mode Control, buck-boost power converter to evaluate the LM25118 controller IC. The
evaluation board provides a 12 V output with 3 A of output current capability. The evaluation board’s wide
input voltage range is from 42 V to 5 V, with operation down to 3 V with some component changes. The
evaluation board operates at 300 kHz, a good compromise between conversion efficiency, tradeoffs
between buck and buck-boost mode requirements, and converter size. The printed circuit board consists
of 4 layers with 2 ounce copper top and bottom, and 1 ounce copper on internal layers. The board is
constructed with FR4 material. This user' guide contains the evaluation board schematic, bill-of-materials
(BOM) and a quick setup procedure. For more complete circuit and design information, see the
LM25118/LM25118Q Wide Voltage Range Buck-Boost Controller (SNVS726) data sheet and quick start.
The performance of the evaluation board is as follows:
• Input Range: 42 V to less than 5 V at Full Current
• Operation to 3 V at Reduced Current and Appropriate Adjustments*
• Output Voltage: 12 V
• Output Current: 0 to 3 A
• Frequency of Operation: 300 kHz
• Board Size: 3.45 X 2.65 inches
• Load Regulation: 1%
• Line Regulation: 0.1%
• Over-Current Limiting
• Operation with VIN Greater or Less than VOUT
*Operation at full current to around 3 V is possible with current limit sense resistor, UVLO threshold, and
corresponding Cramp adjustment. Additional input capacitance may be required. For more details, see the
LM25118/LM25118Q Wide Voltage Range Buck-Boost Controller (SNVS726) data sheet.
2 IC Features
• Integrated High and Low Side Driver
• Internal High Voltage Bias Regulator
• Wide Input Voltage Range: 5 V to 42 V
• Emulated Current Mode Control
• Single Inductor Architecture
• VOUT Operation below and above VIN
• Single Resistor Sets Oscillator Frequency
• Oscillator Synchronization Capability
• Programmable Soft-Start
• Ultra Low (<10 µA) Shutdown Current
• Enable Input
• Wide Bandwidth Error Amplifier
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(8) FB
VIN (1) (16) VCC
RT (3)
(18) HB
VOUT
AGND (6)
PGND (14)
DAP (EP)
(13) CSG
RAMP (5)
SS (7)
(12) CS
(15) LO
(10) VOUT
(19) HO
(20) HS
(9) COMP
LM25118MH
VIN (5V to 42V)
EN (4)
SYNC (11)
VCCX (17)
UVLO (2)
Package
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• Adjustable Output Voltage 1.23 V – 38 V
• 1.5% Feedback Reference Accuracy
• Thermal Shutdown
• No VIN to VOUT Connection during Fault Protection
3 Package
HTSSOP-20EP (Exposed Pad)
4 Application Circuit
See the detailed LM25118EVAL schematic at Figure 17.
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Efficiency
5 Efficiency
Figure 1. Efficiency
Figure 1 illustrates the efficiency of the converter vs. input voltage and output current. These curves
highlight the high efficiency of the converter, especially considering the simplicity of design offered by a
non synchronous implementation. Note the discontinuity in the curves at approximately 17 V and 13 V
which represent mode transition boundaries. The lower efficiencies in the buck-boost region reflect
additional losses at higher input and inductor currents. The decrease in efficiency at higher input voltages
represents higher switching losses.
6 Air Flow
Prolonged operation without airflow at low input voltage and at at full power will cause the MOSFET’s and
Diodes to overheat. A fan with a minimum of 200 LFM should always be provided. Figure 2 illustrates the
temperature rise of various components with no airflow. The ambient was 25°C, and VIN was 8 V.
Figure 2. Temperature vs Load Current With No Airflow – 25°C Ambient
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Powering Up
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7 Powering Up
Connecting the IC’s enable pin to ground will allow powering up the source supply with a minimal output
load. Set the current limit of the source supply to provide about 1.5 times the anticipated wattage of the
load. Note that input currents become very high at low input voltages, which requires an appropriate input
supply. As you remove the connection from the enable pin to ground, immediately check for 12 V at the
output.
A quick efficiency check is the best way to confirm that everything is operating properly. If something is
amiss, you can be reasonable sure that it will affect the efficiency adversely. Few parameters can be
incorrect in a switching power supply without creating losses and potentially damaging heat.
8 Over Current Protection
The evaluation board is configured with over-current protection. The output current is limited to
approximately 4.5 A in the buck-boost mode The 4.5 A value allows for component tolerances to specify a
3 A output current. Note this current will be almost double, or about 7 A in buck mode (VIN greater than
17 V) due to the difference in peak inductor currents in the two different modes.
Figure 3. Short Circuit Current
9 VCCX
A place for a jumper between VOUT and VCCX is provided on the PC board. If operation below about 5 V
is required, connect the jumper to allow VCCX to power the converter (the exact voltage depends on the
gate drive requirements of the switching FETs). The converter does require a minimum VIN of 5 V to
initially start. When running, the input voltage can decrease to below 5 V at reduced current with VCCX
connected to VOUT. Note that this design uses a current limit value to specify a full 3 A of output current
at a minimum VIN of 5 V. For operation lower than 5 V, the current limit resistor, UVLO threshold, and
ramp capacitor must be re-calculated. Caution: make sure the input supply can source the required input
current. Operation at low VIN at full power may overheat and damage the MOSFET’s and Diodes supplied
on the board. Note there is a limit of 14 V applied to VCCX. Never exceed this value if operating VCCX
from an external source, or operating the board with VOUT greater than 12 V. To prevent oscillation,
connect and additional 100 uF or greater electrolytic capacitor across VIN for input voltages less than 5 V.
10 Mode Transition
With VOUT set at 12 V, the LM25118 applications board will operate in the buck mode with VIN greater than
about 17 V. As VIN is reduced below 17 V, the converter begins to operate in a soft buck-boost mode. As
VIN is decreased below 14 V, the converter smoothly transitions to a pure buck-boost mode. This method
of mode transition insures a smooth, glitch free operation as VIN is varied over the transition region.
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Mode Transition
Figure 4. Mode Transition
Figure 4 illustrates soft mode transition. The boost switch pulse-width is relatively narrow compared to the
buck switch waveform. The boost switch pulse-width will gradually increase as VIN decreases, and will
eventually match and lock to the buck switch waveform. At this point, the converter enters full buck-boost
operation.
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Typical Waveforms
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11 Typical Waveforms
Note: All waveforms refer to Rev B design.
Figure 5. VIN = 10 V, IOUT = 1 A, illustrating Figure 6. VIN = 18 V, IOUT = 3 A Illustrating
Buck-Boost Operation Buck Operation
CH1: VSW = 20V/div; CH2: Q1 = 20V/div; CH1: VSW = 20V/div; CH2: Q1 = 20V/div;
CH3: Q2 = 10V/div; CH4: IL= 5A/div CH3: Q2 = 10V/div; CH4: IL= 2A/div
Figure 7. Buck Mode Transient Response Figure 8. Buck-Boost Mode Transient Response
CH2: VOUTripple (ac coupled); CH4: IOUT CH2: VOUTripple (ac coupled); CH4: IOUT
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Bill of Materials
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12 Bill of Materials
Quant Designator Description Manufacturer PartNumber
ity
5 C1, C2, C3, C4, C5 CAP, CERM, 2.2uF, 100V, +/-20%, X7R, 1812 TDK C4532X7R2A225M
3 C6, C16, C17 CAP, CERM, 0.1uF, 100V, +/-10%, X7R, 0603 MuRata GRM188R72A104KA35D
2 C7, C8 CAP, AL, 180uF, 16V, +/-20%, 0.026 ohm, SMD Nippon Chemi-Con APXH160ARA181MJ80G
2 C9, C10 CAP, CERM, 47uF, 16V, +/-10%, X5R, 1210 MuRata GRM32ER61C476KE15L
2 C11, C12 CAP, CERM, 0.47uF, 25V, +/-10%, X7R, 1206 AVX 12063C474KAT2A
1 C13 CAP, CERM, 0.1uF, 100V, +/-10%, X7R, 0805 Kemet C0805C104K1RACTU
1 C15 CAP, CERM, 2200pF, 100V, +/-10%, X7R, 0603 MuRata GRM188R72A222KA01D
1 C18 CAP, CERM, 330pF, 100V, +/-5%, C0G/NP0, 0603 MuRata GRM1885C2A331JA01D
2 C20, C21 CAP, CERM, 1uF, 25V, +/-10%, X7R, 0805 MuRata GRM219R71E105KA88D
1 C22 (Rev A) CAP, CERM, 4700pF, 100V, +/-10%, X7R, 0603 TDK C1608X7R2A472K
1 C22 (Rev B) CAP, CERM, 0.1uF, 100V, +/-10%, X7R, 0603 TDK C1608X7S2A104K
1 D2 Diode, Schottky, 35V, 10A, DPAK ON Semiconductor MBRD1035CTLT4G
1 D3 Diode, Schottky, 100V, 20A, DDPAK Vishay VB40100C-E3/4W
4 J1, J2, J3, J4 Terminal, Turret, TH, Double Keystone 1503-2
1 L1 Inductor, Shielded E Core, Ferrite, 10uH, 18A, Coilcraft SER2915H-103KL
0.00186 ohm, SMD
2 Q1, Q2 MOSFET, N-CH, 75V, 12A, PowerPAK SO-8 Vishay-Siliconix SI7148DP
1 R2 RES, 75.0k ohm, 1%, 0.125W, 0805 Vishay-Dale CRCW080575K0FKEA
1 R3 RES, 1.00Meg ohm, 1%, 0.125W, 0805 Vishay-Dale CRCW08051M00FKEA
1 R4 RES, 0 ohm, 5%, 0.25W, 1206 Vishay-Dale CRCW12060000Z0EA
1 R5 RES, 0 ohm, 5%, 0.1W, 0603 Vishay-Dale CRCW06030000Z0EA
1 R6 RES, 0.015 ohm, 1%, 2W, 3008 Susumu Co Ltd RL7520WT-R015-G
1 R8 RES, 2.67k ohm, 1%, 0.1W, 0603 Vishay-Dale CRCW06032K67FKEA
1 R9 RES, 10.0 ohm, 1%, 0.1W, 0603 Vishay-Dale CRCW060310R0FKEA
1 R10 RES, 10.0k ohm, 1%, 0.1W, 0603 Vishay-Dale CRCW060310K0FKEA
1 R11 RES, 29.4k ohm, 0.1%, 0.1W, 0603 Yageo America RT0603BRD0729K4L
1 R12 (Rev A) RES, 16.2k ohm, 1%, 0.1W, 0603 Vishay-Dale CRCW060316K2FKEA
1 R12 (Rev B) RES, 18.2k ohm, 1%, 0.1W, 0603 Panasonic ERJ-3EKF1822V
1 R14 RES, 309 ohm, 1%, 0.1W, 0603 Vishay-Dale CRCW0603309RFKEA
2 TP1, TP9 Test Point, TH, Multipurpose, Black Keystone 5011
1 TP2 Test Point, TH, Multipurpose, Red Keystone 5010
2 TP3, TP4, TP7, TP8 Test Point, TH, Multipurpose, White Keystone 5012
1 U1 Wide Voltage Range Buck-Boost Controller, 20-pin Texas Insturments LM25118MH/NOPB
TSSOP-EP, Pb-Free
0 C14, C19, R7, R13 DNP
0 D1 Diode, Schottky, 100V, 0.2A, SOD-123 ST BAT41ZFILM
Microelectronics
0 R1 RES, 0 ohm, 5%, 0.125W, 0805 Vishay-Dale CRCW08050000Z0EA
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Printed Circuit Board Layout
13 Printed Circuit Board Layout
Figure 10. Top Layer as Viewed from Top Figure 11. Copper Layer 1 (Top) as Viewed from Top
Figure 12. Copper Layer 2 (Mid-Layer 1) as Viewed Figure 13. Copper Layer 3 (Mid-Layer 2) as Viewed
from Top from Top
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Printed Circuit Board Layout
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Figure 14. Copper Layer4 (Bottom) as Viewed from Figure 15. Bottom Layer as Viewed from Top
Top
Figure 16. Drill Guide and Board Dimensions as Viewed from Top
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS
Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims
arising from the handling or use of the goods.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO
BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF
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DAMAGES.
Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This
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programs, please visit www.ti.com/esh or contact TI.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
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As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal
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For EVMs not subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT,
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This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
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This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
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• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
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Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada.
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This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan
If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product:
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EVALUATION BOARD/KIT/MODULE (EVM)
WARNINGS, RESTRICTIONS AND DISCLAIMERS
For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished
electrical equipment and not intended for consumer use. It is intended solely for use for preliminary feasibility evaluation in
laboratory/development environments by technically qualified electronics experts who are familiar with the dangers and application risks
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Your Sole Responsibility and Risk. You acknowledge, represent and agree that:
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affiliates, contractors or designees) of the EVM for evaluation, testing and other purposes.
2. You have full and exclusive responsibility to assure the safety and compliance of your products with all such laws and other applicable
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minimize the risk of electrical shock hazard.
3. Since the EVM is not a completed product, it may not meet all applicable regulatory and safety compliance standards (such as UL,
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4. You will take care of proper disposal and recycling of the EVM’s electronic components and packing materials.
Certain Instructions. It is important to operate this EVM within TI’s recommended specifications and environmental considerations per the
user guidelines. Exceeding the specified EVM ratings (including but not limited to input and output voltage, current, power, and
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specified output range may result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or
interface electronics. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the
load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures
greater than 60°C as long as the input and output are maintained at a normal ambient operating temperature. These components include
but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors which can be identified using the
EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during normal operation, please
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