LMR12010YMKDEMO/NOPB

www.ti.com Table of Contents User’s Guide LMR12010 Step-Down Converter Evaluation Module User's Guide Table of Contents 1 Introduction.............................................................................................................................................................................2 2 Features...................................................................................................................................................................................2 3 Enable Operation.................................................................................................................................................................... 2 4 Adjusting the Output Voltage................................................................................................................................................ 2 5 Test Setup................................................................................................................................................................................4 6 Typical Performance Characteristics....................................................................................................................................6 7 Layout...................................................................................................................................................................................... 7 8 Additional Circuit Configuration Schematics.................................................................................................................... 10 9 Revision History....................................................................................................................................................................11 Trademarks All trademarks are the property of their respective owners. SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 LMR12010 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 1 Introduction www.ti.com 1 Introduction The LMR12010 is a step down DC-DC regulator that operates at the following switching frequencies: the LMR12010X at 1.6 MHz and the LMR12010Y at 3 MHz. The demo board is configured to convert 5-V input to 1.8-V output at 1-A load current using the Y version. The tiny low profile thin SOT23 package allows the design to use less than 1 square inch of board area. The circuit is configured with the boost diode connected to VIN. VIN must not exceed the maximum operating limit of 5.5 V + VfD2 using this configuration. This makes sure that the voltage between the boost and SW pins, VBOOST – VSW, does not exceed 5.5 V for proper operation. For more information regarding this requirement, see the LMR12010 SIMPLE SWITCHER® 20Vin, 1A Step-Down Voltage Regulator in SOT-23 Data Sheet. The schematics at the end of this document show how to reconfigure this demo board for various input and output conditions as discussed in the LMR12010 SIMPLE SWITCHER® 20Vin, 1A Step-Down Voltage Regulator in SOT-23 Data Sheet. Short or leave open the connections as indicated in the schematics. The previously mentioned restrictions for the input voltage are valid only for the demo board as shipped with the demo board schematic shown in Figure 4-3 2 Features • • • • • 3.0-V to 5-V input voltage range (as shipped) 1.8-V output voltage Up to 1-A output current Switching frequency of 3 MHz Small solution size (17 mm × 17 mm) 3 Enable Operation The demo board includes a spot for a pullup resistor R5 (not stuffed) to enable the device once VIN has exceeded 1.8 V (typical). A typical value for this resistor is 100 KΩ. Otherwise, use the EN post to apply a logic signal to test start-up and shutdown of the device. Never allow the EN voltage to exceed VIN. 4 Adjusting the Output Voltage The output voltage can be changed from 1.8V to another voltage by adjusting the feedback resistors using Equation 1: VOUT = VFB(1 + (RFBT / RFBB)) (1) where • VFB is 0.8 V. For more information on component selection and features, see the device-specific data sheet. 2 LMR12010 Step-Down Converter Evaluation Module User's Guide SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Adjusting the Output Voltage Figure 4-2. LMR12010 Demo Board Bottom View Figure 4-1. LMR12010 Demo Board Top View C4 D3 R3 D2 R4 VIN VIN C1 BOOST C3 R5 L1 VOUT SW D1 EN C2 EN R1 FB GND R2 GND GND Figure 4-3. LMR12010Y Demo Board Schematic Table 4-1. Bill of Materials (BOM) for LMR12010Y Part ID Part Value Manufacturer Part Number Package Type U1 1-A Buck Regulator Texas Instruments LMR12010 Thin SOT23-6 C1, Input Cap 10 µF, 10 V, X5R Murata GRM316R61A475KE19D 1206 C2, Output Cap 10 µF, 6.3 V, X5R Murata GRM319R60J106KE01D 1206 C3, Boost Cap 0.01 µF Vishay VJ0805Y103KXAAC 0805 D1, Catch Diode 0.45 Vf Schottky 1 A, 20VR Vishay MBRA120TRPBF SMA SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 LMR12010 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 3 Test Setup www.ti.com Table 4-1. Bill of Materials (BOM) for LMR12010Y (continued) Part ID Part Value Manufacturer Part Number Package Type D2, Boost Diode 1 Vf at 50-mA Diode L1 2.7 µH, 1.8 A, 33 mΩ Diodes, Inc. 1N4148W-7-F SOD-123 TDK VLCF5028T-2R7N1R8-2 6028 R1 R2 12.4 kΩ, 1% Vishay CRCW080512K4FKEA 0805 10 kΩ, 1% Vishay CRCW080510K0FKEA 0805 R3 0Ω Vishay CRCW08050000Z0EA 0805 D3, C4, R4, R5 Open 5 Test Setup Table 5-1. Demonstration Board Quick Setup Procedures Step Description 1 Connect a power supply to VIN terminals. Notes 2 Connect a load to VO terminals. 3 EN should be connected to VIN for normal operation. Short this to ground to shut down the part. 4 Set VIN = 5 V, with 0-A load applied. Check VO with a voltmeter. Nominal 1.8 V 5 Apply a 1-A load and check VO. Nominal 1.8 V Ammeter A + VOUT GND Ammeter A GND Voltmeter V + - Electronic Load Power Supply Oscilloscope VIN V Voltmeter VO GND C2 Figure 5-2. Voltage Ripple Measurements Demo Board Figure 5-1. Efficiency Measurements 4 LMR12010 Step-Down Converter Evaluation Module User's Guide SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup I I I VIN I I I I GND I I I I I VOUT 75 86 9 10 A B A C B D CE D F E H FJ K L SPARE 46 VOUT SENSE+ 53 VOUT SENSE - 42 VIN SENSE - 13 VIN SENSE+ 2 EN 1 Figure 5-3. Edge Connector Schematic SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 LMR12010 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 5 Typical Performance Characteristics www.ti.com 6 Typical Performance Characteristics 90 EFFICIENCY (%) 80 70 VOUT 100 mV/Div IOUT 500 mA/Div 60 50 40 VIN =3.3V VIN =5.0V 30 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 LOAD CURRENT (A) Figure 6-1. Efficiency vs. Load Current LMR12010Y, VO = 1.8 V 200 Ps/DIV Figure 6-2. Load Transient Waveforms LMR12010Y, IOUT = 100 mA to 1000 mA 10 mV/Div VOUT EN SWITCH NODE 2V/Div 500 ns/DIV 1V/DIV VOUT 1V/DIV 200 Ps/DIV Figure 6-4. Start-Up Waveform Figure 6-3. Switching Node and Output Voltage Waveforms 6 LMR12010 Step-Down Converter Evaluation Module User's Guide SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Layout 7 Layout Figure 7-1. Top Layer Figure 7-2. Top Overlay SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 LMR12010 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 7 Layout www.ti.com Figure 7-3. Inner Layer 1 8 LMR12010 Step-Down Converter Evaluation Module User's Guide Figure 7-4. Inner Layer 2 SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Layout Figure 7-5. Bottom Layer Figure 7-6. Bottom Overlay SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 LMR12010 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 9 Additional Circuit Configuration Schematics www.ti.com 8 Additional Circuit Configuration Schematics C4 D3 R3 D2 VIN R4 BOOST VIN C1 C3 R5 L1 VOUT SW D1 EN C2 EN R1 FB GND R2 GND GND Figure 8-1. VBOOST Derived from VOUT D3 C4 R3 D2 VIN R4 BOOST VIN C1 C3 R5 L1 VOUT SW D1 EN C2 EN R1 FB GND R2 GND GND Figure 8-2. VBOOST Derived from VSHUNT 10 LMR12010 Step-Down Converter Evaluation Module User's Guide SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Revision History D3 C4 R3 D2 VIN R4 BOOST VIN C1 C3 R5 L1 VOUT SW D1 EN C2 EN R1 FB GND R2 GND GND Figure 8-3. VBOOST Derived from Series Zener Diode (VIN) D3 C4 R3 D2 VIN R4 BOOST VIN C3 C1 R5 L1 VOUT SW D1 EN C2 EN R1 FB GND R2 GND GND Figure 8-4. VBOOST Derived from Series Zener Diode (VOUT) 9 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision A (April 2013) to Revision B (December 2021) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................2 • Updated the user's guide title............................................................................................................................. 2 • Edited user's guide for clarity..............................................................................................................................2 SNVA490B – SEPTEMBER 2011 – REVISED DECEMBER 2021 LMR12010 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 11 IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. 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