LMR10520YSDDEMO/NOPB

User's Guide SNVA501A – October 2011 – Revised April 2013 AN-2184 LMR10510/LMR10515/LMR10520 Demo Board 1 Introduction The Texas Instruments LMR10510/LMR10515/LMR10520 is a PWM DC/DC buck (step-down) regulator. With a switching frequency of 3MHz or 1.6MHz the overall solution size is very compact and requires a minimum number of components. The LMR10510/LMR10515/LMR10520 Demo Board is designed to provide the design engineer with a fully functional power converter to evaluate the LMR10510/LMR10515/LMR10520 series of buck regulators. The demo board comes populated with either the LMR10510Y, LMR10515Y, or LMR10520Y but can easily be modified to accommodate any of the LMR10510/LMR10515/LMR10520 regulator ICs. Top View Bottom View Figure 1. LMR10510/LMR10515/LMR10520 Demo Board All trademarks are the property of their respective owners. SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback AN-2184 LMR10510/LMR10515/LMR10520 Demo Board Copyright © 2011–2013, Texas Instruments Incorporated 1 Features 2 Features • • • • • 3 www.ti.com 3.0V to 5.5V Input Voltage Range 1.8V Output Voltage (Default Setting) 1A/1.5A/2.0A Output Current Switching Frequency of 3MHz Small Solution Size (13 × 12mm) Shutdown Operation The demo board includes a pull-up resistor, R3, to enable the device once VIN has exceeded 1.8V (typ). Use the EN post to disable the device by pulling this node to GND. A logic signal may be applied, to the post, to test startup and shutdown of the device. 4 Adjusting the Output Voltage The output voltage can be changed from 1.8V to another voltage by adjusting the feedback resistors using the following equation: VOUT = VFB(1 + (R1/R2)) (1) Where VFB is 0.6V. For more information on component selection and features, see: • LMR10510 SIMPLE SWITCHER 5.5Vin, 1A Step-Down Voltage Regulator in SOT-23 and WSON (SNVS727) • LMR10515 SIMPLE SWITCHER 5.5Vin, 1.5A Step-Down Voltage Regulator in SOT-23 and WSON (SNVS728) • LMR10520 SIMPLE SWITCHER 5.5Vin, 2.0A Step-Down Voltage Regulator in WSON (SNVS730) 2 AN-2184 LMR10510/LMR10515/LMR10520 Demo Board SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated LMR10510 Demo Board Schematic www.ti.com 5 LMR10510 Demo Board Schematic EN R3 U1 6 VIN 4, 5 2 C3 EN SW VOUT L1 3 VINA / VIND FB GND R1 1 C1 C2 C4 Chf D1 R2 GND GND Figure 2. LMR10510 Demo Board Schematic Table 1. Bill of Materials LMR10510Y Part ID Part Value Manufacturer Part Number Package Type U1 1A Buck Regulator Texas Instruments LMR10510 WSON C1, C2 2.2µF, 10V, X5R TDK C2012X5R1A225K 0805 C3, C4 22µF, 6.3V, X5R TDK C3216X5R0J226M 1206 Chf 22nF, 50V, X7R Murata GRM188R71H223KA01D 0603 D1, Catch Diode Schottky 1.5A, 30VR Toshiba CRS08 SFLAT L1 1.0 µH, 2.05A, 45mΩ Murata LQH32PN1R0NN0 R1 20.0 KΩ, 1% Vishay CRCW060320K0FKEA 0603 R2 10.0 KΩ, 1% Vishay CRCW060310K0FKEA 0603 R3 1 MegΩ, 5% Vishay CRCW06031M00JNEA 0603 GND Test Point, Black Keystone 5011 VIN Test Point, Red Keystone 5010 VOUT Test Point, Orange Keystone 5013 EN Test Point, Yellow Keystone 5014 SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback AN-2184 LMR10510/LMR10515/LMR10520 Demo Board Copyright © 2011–2013, Texas Instruments Incorporated 3 LMR10515 Demo Board Schematic 6 www.ti.com LMR10515 Demo Board Schematic EN R3 U1 6 VIN 4, 5 2 C3 EN SW VOUT L1 3 VINA / VIND FB GND R1 1 C1 C2 C4 Chf D1 R2 GND GND Figure 3. LMR10515 Demo Board Schematic Table 2. Bill of Materials LMR10515Y 4 Part ID Part Value Manufacturer Part Number Package Type U1 1.5A Buck Regulator Texas Instruments LMR10515 WSON C1, C2 2.2µF, 10V, X5R TDK C2012X5R1A225K 0805 C3, C4 22µF, 6.3V, X5R TDK C3216X5R0J226M 1206 Chf 22nF, 50V, X7R Murata GRM188R71H223KA01D 0603 D1, Catch Diode Schottky 1.5A, 30VR Toshiba CRS08 SFLAT L1 1.0 µH, 2.05A, 45mΩ Murata LQH32PN1R0NN0 R1 20.0 KΩ, 1% Vishay CRCW060320K0FKEA 0603 R2 10.0 KΩ, 1% Vishay CRCW060310K0FKEA 0603 R3 1 MegΩ, 5% Vishay CRCW06031M00JNEA 0603 GND Test Point, Black Keystone 5011 VIN Test Point, Red Keystone 5010 VOUT Test Point, Orange Keystone 5013 EN Test Point, Yellow Keystone 5014 AN-2184 LMR10510/LMR10515/LMR10520 Demo Board SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated LMR10520 Demo Board Schematic www.ti.com 7 LMR10520 Demo Board Schematic EN R3 U1 6 VIN 4, 5 2 C3 EN SW VOUT L1 3 VINA / VIND FB GND R1 1 C1 C2 C4 Chf D1 R2 GND GND Figure 4. LMR10520 Demo Board Schematic Table 3. Bill of Materials LMR10520Y Part ID Part Value Manufacturer Part Number Package Type U1 2A Buck Regulator Texas Instruments LMR10520 WSON C1, C2 2.2µF, 10V, X5R TDK C2012X5R1A225K 0805 C3, C4 22µF, 6.3V, X5R TDK C3216X5R0J226M 1206 Chf 22nF, 50V, X7R Murata GRM188R71H223KA01D 0603 D1, Catch Diode Schottky 2A, 30V Toshiba CMS06 MFLAT L1 1.0 µH, 2.45A, 30mΩ Murata LQH44PN1R0NP0L R1 20.0 KΩ, 1% Vishay CRCW060320K0FKEA 0603 R2 10.0 KΩ, 1% Vishay CRCW060310K0FKEA 0603 R3 1 MegΩ, 5% Vishay CRCW06031M00JNEA 0603 GND Test Point, Black Keystone 5011 VIN Test Point, Red Keystone 5010 VOUT Test Point, Orange Keystone 5013 EN Test Point, Yellow Keystone 5014 SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback AN-2184 LMR10510/LMR10515/LMR10520 Demo Board Copyright © 2011–2013, Texas Instruments Incorporated 5 Quick Setup Procedures 8 www.ti.com Quick Setup Procedures Step 1: Connect a power supply to VIN terminals. VIN range: 3V to 5.5V Step 2: Connect a load to VOUT terminals. IOUT range: 0A to 1A / 1.5A / 2.0A Step 3: EN should be left floating for normal operation. Short this to ground to shutdown the part. Step 4: Apply VIN = 5V, with 0A load applied, check VOUT with a voltmeter. Nominal 1.8V Step 5: Apply a 1A / 1.5A / 2.0A load and check VOUT. Nominal 1.8V Measurements Ammeter A Ammeter A + VOUT GND GND + - Electronic Load - 9 Power Supply VIN Voltmeter V V Voltmeter Evaluation Board Figure 5. Efficiency Measurements Oscilloscope VOUT GND Chf Figure 6. Voltage Ripple Measurements 6 AN-2184 LMR10510/LMR10515/LMR10520 Demo Board SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Measurements www.ti.com I I I VOUT I I I I I I I I I VIN GND 75 86 9 10 A B A C B D CE D F E H FJ K L EN 46 VIN SENSE+ 53 VIN SENSE - 42 VOUT SENSE - 13 VOUT SENSE+ 2 SPARE 1 Figure 7. Edge Connector Schematic SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback AN-2184 LMR10510/LMR10515/LMR10520 Demo Board Copyright © 2011–2013, Texas Instruments Incorporated 7 Typical Performance Characteristics 10 www.ti.com Typical Performance Characteristics Efficiency vs. Load Current LMR10510 Load Transient Waveforms LMR10510 90 EFFICIENCY (%) 80 70 60 50 40 VIN =3.3V VIN =5.0V 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) Efficiency vs. Load Current LMR10515 Load Transient Waveforms LMR10515 90 EFFICIENCY (%) 80 70 60 50 40 VIN =3.3V VIN =5.0V 0.000.150.300.450.600.750.901.051.201.351.50 LOAD CURRENT (A) Efficiency vs. Load Current LMR10520 Load Transient Waveforms LMR10520 90 EFFICIENCY (%) 80 70 60 50 40 VIN =3.3V VIN =5.0V 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 LOAD CURRENT (A) 8 AN-2184 LMR10510/LMR10515/LMR10520 Demo Board SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Typical Performance Characteristics www.ti.com Switching Node and Output Voltage Waveforms SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback Startup Waveform AN-2184 LMR10510/LMR10515/LMR10520 Demo Board Copyright © 2011–2013, Texas Instruments Incorporated 9 Layout 11 www.ti.com Layout Figure 8. Top Layer Figure 9. Top Overlay 10 AN-2184 LMR10510/LMR10515/LMR10520 Demo Board SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Layout www.ti.com Figure 10. Bottom Layer Figure 11. Bottom Overlay SNVA501A – October 2011 – Revised April 2013 Submit Documentation Feedback AN-2184 LMR10510/LMR10515/LMR10520 Demo Board Copyright © 2011–2013, Texas Instruments Incorporated 11 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. 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