7
Rinc
D1
L1
Rfbt
VIN
U1
SW
FB
LMR10530YSD
SW
8
VOUT
Rfbb
Cff
Cinc
Co2
Ren
Co1
9
5
4
6
10
2
1
11
3
SW
SW
NC
PGND
SGND
DAP
VINC
EN
EN
VIND
VIND
GND
1 Introduction
The LMR10530 evaluation module is designed to provide the power supply design engineer with a fully
functional regulator design using the LMR10530 3MHz switching regulator in an WSON-10 package. The
evaluation module is configured to provide an output of 1.2V at up to 3A from an input voltage range of 3V
to 5.5V.
The printed circuit board consists of 4 layers of copper on FR4 material. The middle layers are solid
ground layers with the first middle layer having a small polygon cut out for the VINnode. The intermediate
ground layer helps in minimizing the AC current loop. The LMR10530 is thermally tied to the other layers
by thermal vias directly underneath the device. This user's guide contains the evaluation module
schematic, a quick setup procedure, and a Bill-of-Materials (BOM). For complete circuit design
information, see LMR10530 SIMPLE SWITCHER 5.5Vin, 3.0A Step-Down Voltage Regulator in WSON-10
(SNVS814).
The module has a Cffcapacitor footprint reserved for applications requiring higher V
helps to minimize the output voltage overshoot during sluggish startup. For suggested cap values, see the
LMR10530 datasheet (SNVS814). The module also has a reserved footprint for an additional output cap,
Co2, for certain applications requiring more capacitance.
User's Guide
SNVU192A–October 2012–Revised April 2013
AN-2280 LMR10530 Evaluation Module
. The Cffcap also
OUT
The performance of the evaluation board is:
• Input Range: 3 to 5.5V
• Output Voltage: 1.2V
• Output Current: 0 to 3A
• Frequency of Operation: 3000 kHz
• Board Size: 2.016 × 1.08 inches (51.2 × 27.43 mm)
2 Evaluation Board Schematic
Figure 1. LMR10530 Evaluation Module Schematic
All trademarks are the property of their respective owners.
SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module
Submit Documentation Feedback
1
Copyright © 2012–2013, Texas Instruments Incorporated
Powering and Loading Considerations
3 Powering and Loading Considerations
Read this entire section prior to attempting to power the evaluation board.
3.1 Quick Start Procedure
Step 1: Set the bench power supply current limit to 3A. Set the power supply voltage to 4V. Turn off the
power supply output. Connect the power supply to the LMR10530 demo board. Positive connection to V
and negative connection to GND.
Step 2: Connect a load, as high as 3A, to the V
connection to GND.
Step 3: The EN pin should be left open for normal operation.
Step 4: Turn on the bench power supply with no load applied to the LMR10530. The V
regulation at a nominal 1.2V output.
Step 5: Slowly increase the load while monitoring the output voltage, V
the load is increased up to 3 Amps. The LMR10530 is designed to skip some pulses at very light loads to
maintain output voltage regulation. Depending on load levels, the circuit may operate in either
discontinuous or continuous conduction mode.
Step 6: Slowly sweep the input voltage from 3 to 5.5V, V
1.2V output.
3.2 Starting Up
terminal. Positive connection to V
OUT
should remain in regulation as
OUT
should remain in regulation with a nominal
OUT
and negative
OUT
would be in
OUT
www.ti.com
IN
By default, VINC is connected to VINthrough a low pass filter to remove any high frequency noise present
at the input. EN is connected to VINC through a 100kΩ resistor. A separate logic signal at the EN terminal
can be used, if startup and shutdown need to be controlled. The EN pin is tied to VINto simplify start-up.
The pull-up resistor allows the power supply design engineer to toggle EN independently, if desired, and
observe the start-up behavior of the LMR10530.
3.3 Adjusting the Output Voltage
The output voltage is set using the following equation where R
GND, and R
V
OUT
The feedback voltage VFB is regulated at 0.60V typically.
Adjusting the output voltage will affect the performance of the LMR10530. In addition, output capacitors
might not be rated for the new output voltage. For more information, see LMR10530 SIMPLE SWITCHER
5.5Vin, 3.0A Step-Down Voltage Regulator in WSON-10 (SNVS814).
is connected between V
fbt
= VFB(1 + (R
)) (1)
fbt/Rfbb
OUT
and FB.
is connected between the FB pin and
fbb
2
AN-2280 LMR10530 Evaluation Module SNVU192A–October 2012–Revised April 2013
Copyright © 2012–2013, Texas Instruments Incorporated
Submit Documentation Feedback
Co
VOUT GND
Oscilloscope
www.ti.com
3.4 Typical Test Setup
Powering and Loading Considerations
Figure 2. Efficiency Measurements
SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module
Submit Documentation Feedback
Figure 3. Voltage Ripple Measurements
3
Copyright © 2012–2013, Texas Instruments Incorporated
GND
EN
VIN SENSE+
SPARE
VOUT SENSE+
I I I I I I
I I I I I I
1 2 3 4 5 6
A B C D E F
VIN
VOUT
GND
Powering and Loading Considerations
www.ti.com
Figure 4. Edge Connector Schematic
4
AN-2280 LMR10530 Evaluation Module SNVU192A–October 2012–Revised April 2013
Copyright © 2012–2013, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
4 Board Images
Board Images
SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module
Submit Documentation Feedback
Figure 5. Top Side
5
Copyright © 2012–2013, Texas Instruments Incorporated
Board Images
www.ti.com
6
AN-2280 LMR10530 Evaluation Module SNVU192A–October 2012–Revised April 2013
Figure 6. Bottom Side
Copyright © 2012–2013, Texas Instruments Incorporated
Submit Documentation Feedback
V
OUT
= 1.2V
100 mV/Div
100 Ps/DIV
500 mA/Div
I
OUT
V
OUT
= 1.2V
20 mV/Div
2V/Div
200 ns/DIV
V
SW
V
OUT
= 1.2V
20 mV/Div
2V/Div
200 ns/DIV
V
SW
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
57
60
63
66
69
72
75
78
81
EFFICIENCY (%)
I
OUT
(A)
Vin = 3.0V
Vin = 3.5V
Vin = 4.0V
Vin = 4.2V
Vin = 4.6V
Vin = 4.8V
Vin = 5.2V
Vin = 5.5V
V
OUT
= 1.2V
500 mV/Div
1V/Div
100 Ps/DIV
VIN = 5.5V
2A/Div
I
OUT
= 3A
www.ti.com
5 Typical Performance Characteristics
Efficiency vs Load Current
V
= 1.2V Startup
OUT
Steady-state (CCM Mode) Steady-state (DCM Mode)
VIN= 3V, I
= 3A VIN= 5.5V, I
OUT
Typical Performance Characteristics
= 0.025A
OUT
SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module
Submit Documentation Feedback
Load Transient
VIN= 5.5V, I
Copyright © 2012–2013, Texas Instruments Incorporated
= 0.3A to 3A
OUT
7
Bill of Materials
6 Bill of Materials
Part ID Part Value Part Number Manufacturer
U1 3MHz 3.0A buck regulator, WSON-10 LMR10530 Texas Instruments
L1 1.2µH, 4.6A 7447745012 Wurth Elektronik eiSos
Cin 47µF, 10V, X5R, 1206 C3216X5R0J226M TDK
Cinc 0.22µF, 25V, X7R, 0603 06033D224KAT2A AVX
Co1 47µF, 10V, X5R, 1210 GRM32ER61A476KE20L Murata
D1 Schottky, 30V, 3A, 3-4E1A CMS01 Toshiba
Rfbt 2.00kΩ, 1%, 1/8W, 0603 CRCW06032K00FKEA Vishay
Rfbb 2.00kΩ, 1%, 1/8W, 0603 CRCW06032K00FKEA Vishay
Rinc 10.0Ω, 1%, 1/8W, 0603 CRCW060310R0FKEA Vishay
Ren 100kΩ, 1%, 1/8W, 0603 CRCW0603100KFKEA Vishay
VIN Test Point Loop 5010 Keystone
SW Test Point Loop 5012 Keystone
GND Test Point Loop 5011 Keystone
GND Test Point Loop 5011 Keystone
VOUT Test Point Loop 5013 Keystone
EN Test Point Loop 5014 Keystone
www.ti.com
8
AN-2280 LMR10530 Evaluation Module SNVU192A–October 2012–Revised April 2013
Copyright © 2012–2013, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
7 Layout
Layout
Figure 7. Top Copper
SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module
Submit Documentation Feedback
Figure 8. Top Overlay
9
Copyright © 2012–2013, Texas Instruments Incorporated
Layout
www.ti.com
Figure 9. Internal Plane 1
10
AN-2280 LMR10530 Evaluation Module SNVU192A–October 2012–Revised April 2013
Figure 10. Internal Plane 2
Copyright © 2012–2013, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
Layout
Figure 11. Bottom Overlay
SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module
Submit Documentation Feedback
Figure 12. Bottom Copper
11
Copyright © 2012–2013, Texas Instruments Incorporated
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.
TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
performed.
TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered
documentation. Information of third parties may be subject to additional restrictions.
Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service
voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.
TI is not responsible or liable for any such statements.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.
In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.
No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.
Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.
TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.
Products Applications
Audio www.ti.com/audio Automotive and Transportation www.ti.com/automotive
Amplifiers amplifier.ti.com Communications and Telecom www.ti.com/communications
Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers
DLP® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps
DSP dsp.ti.com Energy and Lighting www.ti.com/energy
Clocks and Timers www.ti.com/clocks Industrial www.ti.com/industrial
Interface interface.ti.com Medical www.ti.com/medical
Logic logic.ti.com Security www.ti.com/security
Power Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense
Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
RFID www.ti-rfid.com
OMAP Applications Processors www.ti.com/omap TI E2E Community e2e.ti.com
Wireless Connectivity www.ti.com/wirelessconnectivity
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2013, Texas Instruments Incorporated
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Texas Instruments:
LMR10530YSDEVM/NOPB
Loading...