LMR24220RB/NOPB

User's Guide SNVA505A – September 2011 – Revised April 2013 AN-2193 LMR24220 Multi-Rail Reference Board 1 Introduction The LMR24220 multi-rail reference board implements an extremely compact solution. It is designed to convert from 12 V or 24 V rails down to typical point-of-load voltages of 3.3V, 1.8V and 1.2V. This design utilizes an LMR24220 Nano Regulator and two LMZ10501 Nano Modules to demonstrate a complete solution for space constrained multi-rail applications. The complete solution size is 20.32 x 13.34 x 2mm with all components placed on a single side. The board can be plugged into a standard 8-pin header with 100 mil spacing and total thickness less than 100 mils for ease of prototyping. 2 Features • • • • • 3 5 V to 32 V Input Voltage Range 3.3 V / 1.8 V / 1.2 V Output Voltage Rails Up to 1000 mA Output Current Per Rail Small Solution Size (20.32 x 13.34 x 2mm) No External Compensation Required Shutdown Operation The reference board includes a resistor divider that implements an under voltage lockout (UVLO) that disables the part when VIN is below 4 V. The threshold for the UVLO can be adjusted to suit the needs of the application. Ret = (VUVLO* 10K - 12.4K) (1) The midpoint of the resistor divider is clamped to 4.3 V by diode D2 so that the EN pin voltage of the LMR24220 does not exceed 7V. The midpoint is also tied to pin 8 of the header (EN). Use the EN pin 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 on the LMR24220 can be changed from 3.3 V to another voltage by adjusting the feedback resistors using Equation 2. R1 = [(VOUT / VFB) -1] *R2 (2) Where VFB is 0.8V. The output voltage of either LMZ10501 can be changed from 1.8 V/1.2 V to another voltage by adjusting the feedback resistors using Equation 3. RB = [VOUT / (5.875 - VOUT)] * RT (3) For more information on component selection and features, see the LMR24220 and LMZ10501 data sheets. All trademarks are the property of their respective owners. SNVA505A – September 2011 – Revised April 2013 Submit Documentation Feedback AN-2193 LMR24220 Multi-Rail Reference Board Copyright © 2011–2013, Texas Instruments Incorporated 1 Adjusting the Output Voltage www.ti.com Bottom View Figure 1. LMR24220 Multi-Rail Reference Board - Top View VIN to 3.3V Vin 5V ± 32V 3.3V U2 L2 VIN Ron EN Ci2b Ci3b Figure 2. LMR24220 Multi-Rail Reference Board Bottom View L1 BST RON LMR24220 FB EN Ret SS Ci2a VCC Co2a C10 Cc1 RT3 VIN RB3 Ci1a GND FB EN VREF VCON 3.3V LMZ10501 FB SGND 3.3V VREF VCON RB 3.3V Rail Indicator LED U3 U1 RT Co2c Cvcc 3.3V to 1.2V EN Co2b R2 3.3V to 1.8V 3.3V R1 Cbt GND Css D2 Reb GND SW Cc3 VIN LMZ10501 FB VOUT 1.8V SGND Ci3a RLED GND VOUT FB 3.3V 3.3V 1.2V D1 Co3a Co1a GND GND Figure 3. LMR24220 Reference Board Schematic Table 1. Bill of Materials (BOM) LMR24220 2 Designation Description Size Manufacturer Part # Vendor U1 LMZ10501 SE08A LMZ10501 TI U2 LMR24220 28-ball DSBGA LMR24220 TI U3 LMZ10501 SE08A LMZ10501 TI C10 Cap 10nF 25V X7R 0402 C1005X7R1E103K TDK Cbt, Ci2a, Co2a Cap 0.047µF 50V X7R 0603 GRM188R71H473KA61D Murata Cc1, Cc3 Cap 1000pF 25V X7R 0201 GRM033R71E102KA01D Murata Ci1a, Ci3a, Co1a, Co3a Cap 4.7µF 6.3V X5R 0603 C1608X5R0J475M TDK Ci2b, Ci3b Cap 10µF 35V X5R 1206 GRM31CR6YA106KA12L Murata AN-2193 LMR24220 Multi-Rail Reference Board SNVA505A – September 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Test Setup www.ti.com Table 1. Bill of Materials (BOM) LMR24220 (continued) 5 Designation Description Size Manufacturer Part # Vendor Ci2b, Ci3b (alt) Cap 10µF 50V X5R 1210 UMK325BJ106MMT Taiyo Yuden Co2b, Co2c Cap 47µF 6.3V X5R 1206 C3216X5R0J476M TDK Css Cap 22nF 16V X7R 0402 C1005X7R1C223K TDK Cvcc Cap 1µF 25V X7R 0805 GCM21BR71E105KA56L Murata Panasonic D1 LED, Blue, SMD 0402 LNJ947W8CRA D2 Zener Diode 4.3V 200mW SOD-523F MM5Z4V3 Fairchild L1 Shielded Inductor 6.8µH 2.4A (5.49mm x 5.18mm x 2.00mm) IHLP2020BZER6R8M01 Vishay-Dale L2 LTCC Inductor 2.2µH 0.9A (2.50mm x 1.50mm x 1.20mm) CPL2512T2R2M Vishay-Dale R1 RES, 6.81k ohm, 1%, 0.063W 0402 CRCW04026K81FKED Vishay-Dale R2 RES, 2.21k ohm, 1%, 0.063W 0402 CRCW04022K21FKED Vishay-Dale Reb RES, 12.4k ohm, 1%, 0.063W 0402 CRCW040212K4FKED Vishay-Dale Ret RES, 28.0k ohm, 1%, 0.063W 0402 CRCW040228K0FKED Vishay-Dale Ron RES, 76.8k ohm, 1%, 0.063W 0402 CRCW040276K8FKED Vishay-Dale Rb, Rb3 RES, 82.5k ohm, 1%, 0.063W 0402 CRCW040282K5FKED Vishay-Dale Rt RES, 187k ohm, 1%, 0.063W 0402 CRCW0402187KFKED Vishay-Dale Rt3 RES, 316k ohm, 1%, 0.063W 0402 CRCW0402316KFKED Vishay-Dale Rled RES, 332 ohm, 1%, 0.063W 0402 CRCW0402332RFKED Vishay-Dale J1 0.100" (2.54mm), Surface Mount Header, 1x8, Gold plated,Right Angle 961108-5500-AR-PR 3M J2 0.100" (2.54 mm) Female Header: 1x8-Pin, Straight 960108-6202-AR 3M Test Setup Table 2. Pin Descriptions Pin Name Description 1 3.3 V 3.3 V Output Voltage — Output from the LMR24220 (U2). Supplies current to both the LMZ10501s and any external load. Total Current up to 1.5 Amps without airflow. 2 Amps with airflow. 2, 4, 6 GND Ground — Reference point for all stated voltages. 3 VIN Input supply — Nominal operating range is 5 V to 32 V. To increase the maximum operating voltage of the design to 42 V, use the alternate Ci2b, and Ci3b capacitors called out in the BOM. 5 1.2V 1.2 V Output Voltage — Output from the LMZ10501 (U1). Load current up to 1A. 7 1.8V 1.8 V Output Voltage — Output from the LMZ10501 (U3). Load current up to 1A. 8 EN Enable — Input to the LMR24220 precision enable comparator. Rising threshold is 1.274 V typical. Leave floating to allow the resistor divider to enable the reference board when VIN exceeds 4 V. SNVA505A – September 2011 – Revised April 2013 Submit Documentation Feedback AN-2193 LMR24220 Multi-Rail Reference Board Copyright © 2011–2013, Texas Instruments Incorporated 3 Typical Performance Characteristics www.ti.com Table 3. Demonstration Board Quick Setup Procedures Step 6 Description Notes 1 Connect a power supply to VIN terminal VIN range: 5 V to 32 V 2 Connect a load to 3.3 V / 1.8 V / 1.2 V terminals IOUT range: 0A to 1.0A 3 EN should be left floating for normal operation. Short this to ground to shutdown the part 4 Set VIN = 12 V, with 0A load applied, check 3.3 V / 1.8 V / 1.2 V rails with a voltmeter 5 Apply a 1.0A load to any rail and check 3.3 V / 1.8 V / 1.2 V rails with a voltmeter Typical Performance Characteristics Efficiency vs. Load Current LMR24220, VOUT = 3.3V Efficiency vs. Load Current LMZ10501, VOUT = 1.2V 90 100 90 EFFICIENCY (%) EFFICIENCY (%) 80 70 60 50 80 70 60 50 40 40 30 0.0 30 VIN = 12V VIN = 24V 0.5 1.0 1.5 LOAD CURRENT (A) VIN = 3.3V 20 2.0 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 LMZ10501, VOUT = 1.8V Startup Waveform 100 EN EFFICIENCY (%) 90 1V/Div 80 70 60 3.3V 1V/Div 50 1.8V 1V/Div 1.2V 1V/Div 40 30 20 VIN = 3.3V 500 Ps/DIV 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) 4 AN-2193 LMR24220 Multi-Rail Reference Board SNVA505A – September 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Layout www.ti.com Output Ripple 1.8V 1.2V Output Power Tradeoff 2.00 30 mV/Div 3.3V RAIL MAXIMUM LOAD (A) 3.3V 30 mV/Div 30 mV/Div 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 5 Ps/DIV No Airflow. 85C Max Junction Airflow 0.0 0.5 1.0 1.5 2.0 2.5 3.0 1.2V AND 1.8V RAILS TOTAL OUTPUT POWER (W) 7 Layout Figure 4. Top Layer Figure 5. Top Overlay Figure 6. Mid Layer1 (GND) SNVA505A – September 2011 – Revised April 2013 Submit Documentation Feedback AN-2193 LMR24220 Multi-Rail Reference Board Copyright © 2011–2013, Texas Instruments Incorporated 5 Layout www.ti.com Figure 7. Mid Layer2 (3.3V) Figure 8. Bottom Layer Figure 9. Bottom Overlay 6 AN-2193 LMR24220 Multi-Rail Reference Board SNVA505A – September 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, 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. 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