SNVS817B June   2012  – June 2019 LMR12015 , LMR12020

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Circuit
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Descriptions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Recommended Operating Ratings
    3. 6.3 Electrical Characteristics
    4. 6.4 Typical Performance Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Boost Function
      2. 7.3.2  Low Input Voltage Considerations
      3. 7.3.3  High Output Voltage Considerations
      4. 7.3.4  Frequency Synchronization
      5. 7.3.5  Current Limit
      6. 7.3.6  Frequency Foldback
      7. 7.3.7  Soft Start
      8. 7.3.8  Output Overvoltage Protection
      9. 7.3.9  Undervoltage Lockout
      10. 7.3.10 Thermal Shutdown
    4. 7.4 Device Operation Modes
      1. 7.4.1 Enable Pin / Shutdown Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Detailed Design Procedure
        1. 8.2.1.1  Custom Design With WEBENCH® Tools
        2. 8.2.1.2  Inductor Selection
          1. 8.2.1.2.1 Inductor Calculation Example
          2. 8.2.1.2.2 Inductor Material Selection
        3. 8.2.1.3  Input Capacitor
        4. 8.2.1.4  Output Capacitor
        5. 8.2.1.5  Catch Diode
        6. 8.2.1.6  Boost Diode (Optional)
        7. 8.2.1.7  Boost Capacitor
        8. 8.2.1.8  Output Voltage
        9. 8.2.1.9  Feedforward Capacitor (Optional)
        10. 8.2.1.10 Calculating Efficiency and Junction Temperature
          1. 8.2.1.10.1 Schottky Diode Conduction Losses
          2. 8.2.1.10.2 Inductor Conduction Losses
          3. 8.2.1.10.3 MOSFET Conduction Losses
          4. 8.2.1.10.4 MOSFET Switching Losses
          5. 8.2.1.10.5 IC Quiescent Losses
          6. 8.2.1.10.6 MOSFET Driver Losses
          7. 8.2.1.10.7 Total Power Losses
          8. 8.2.1.10.8 Efficiency Calculation Example
          9. 8.2.1.10.9 Calculating the LMR2015/20 Junction Temperature
      2. 8.2.2 Application Curves
      3. 8.2.3 LMR12015/20 Circuit Examples
  9. 9 Layout
    1. 9.1 Layout Considerations
      1. 9.1.1 Compact Layout
      2. 9.1.2 Ground Plane and Shape Routing
      3. 9.1.3 FB Loop
      4. 9.1.4 PCB Summary
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
      2. 10.1.2 Development Support
        1. 10.1.2.1 Custom Design With WEBENCH® Tools
    2. 10.2 Related Links
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Community Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.3 LMR12015/20 Circuit Examples

LMR12015 LMR12020 30197015.gifFigure 37. VIN = 7 - 20 V, VOUT = 5 V, ƒSW = 2 MHz,
IOUT = Full Load With CFF

Table 3. Bill Of Materials For Figure 37

PART NAME PART ID PART VALUE PART NUMBER MANUFACTURER
Buck Regulator U1 1.5 or 2A Buck Regulator LMR12015/20 Texas Instruments
CPVIN C1 10 µF C1210C106K8PACTU Kemet
CBOOST C2 0.1 µF C0603X104K4RACTU Kemet
COUT C3 22 µF GRM32ER71C226KE18L MuRata
COUT C4 22 µF GRM32ER71C226KE18L MuRata
CFF C5 0.18 µF 0603ZC184KAT2A AVX
Catch Diode D1 Schottky Diode Vf = 0.32V CMS06 Toshiba
Inductor L1 3.3 µH 7447789003 Wurth
Feedback Resistor R1 4.02 kΩ CRCW06034K02FKEA Vishay
Feedback Resistor R2 1.02 kΩ CRCW06031K02FKEA Vishay
LMR12015 LMR12020 30197015.gifFigure 38. VIN = 5 - 20 V, VOUT = 3.3 V, ƒSW = 2 MHz,
IOUT = Full Load With CFF

Table 4. Bill Of Materials For Figure 38

PART NAME PART ID PART VALUE PART NUMBER MANUFACTURER
Buck Regulator U1 1.5 or 2A Buck Regulator LMR12015/20 Texas Instruments
CPVIN C1 10 µF C1210C106K8PACTU Kemet
CBOOST C2 0.1 µF C0603X104K4RACTU Kemet
COUT C3 22 µF GRM32ER71C226KE18L MuRata
COUT C4 22 µF GRM32ER71C226KE18L MuRata
CFF C5 0.18 µF 0603ZC184KAT2A AVX
Catch Diode D1 Schottky Diode Vf = 0.32V CMS06 Toshiba
Inductor L1 3.3 µH 7447789003 Wurth
Feedback Resistor R1 2.32 kΩ CRCW06032K32FKEA Vishay
Feedback Resistor R2 1.02 kΩ CRCW06031K02FKEA Vishay
LMR12015 LMR12020 30197014.gifFigure 39. VIN = 5 - 20 V, VOUT = 3.3 V, ƒSW = 2 MHz,
IOUT = Full Load Without CFF

Table 5. Bill Of Materials For Figure 39

PART NAME PART ID PART VALUE PART NUMBER MANUFACTURER
Buck Regulator U1 1.5 or 2A Buck Regulator LMR12015/20 Texas Instruments
CPVIN C1 10 µF C1210C106K8PACTU Kemet
CBOOST C2 0.1 µF C0603X104K4RACTU Kemet
COUT C3 22 µF GRM32ER71C226KE18L MuRata
COUT C4 22 µF GRM32ER71C226KE18L MuRata
Catch Diode D1 Schottky Diode Vf = 0.32V CMS06 Toshiba
Inductor L1 3.3 µH 7447789003 Sumida
Feedback Resistor R1 2.32 kΩ CRCW06032K32FKEA Vishay
Feedback Resistor R2 1.02 kΩ CRCW06031K02FKEA Vishay
LMR12015 LMR12020 30197014.gifFigure 40. VIN = 3.3 - 16 V, VOUT = 1.8 V, ƒSW = 2 MHz, IOUT = Full Load

Table 6. Bill Of Materials For Figure 40

PART NAME PART ID PART VALUE PART NUMBER MANUFACTURER
Buck Regulator U1 1.5 or 2A Buck Regulator LMR12015/20 Texas Instruments
CPVIN C1 10 µF GRM32DR71E106KA12L Murata
CBOOST C2 0.1 µF GRM188R71C104KA01D Murata
COUT C3 22 µF C3225X7R1C226K TDK
COUT C4 22 µF C3225X7R1C226K TDK
Catch Diode D1 Schottky Diode Vf = 0.32V CMS06 Toshiba
Inductor L1 1.0 µH CDRH5D18BHPNP Sumida
Feedback Resistor R1 12 kΩ CRCW060312K0FKEA Vishay
Feedback Resistor R2 15 kΩ CRCW060315K0FKEA Vishay
LMR12015 LMR12020 30197073.gifFigure 41. VIN = 3.3 - 16 V, VOUT = 1.8 V, ƒSW = 1 MHz, IOUT = Full Load

Table 7. Bill Of Materials For Figure 41

PART NAME PART ID PART VALUE PART NUMBER MANUFACTURER
Buck Regulator U1 1.5 or 2A Buck Regulator LMR12015/20 Texas Instruments
CPVIN C1 10 µF GRM32DR71E106KA12L Murata
CBOOST C2 0.1 µF GRM188R71C104KA01D Murata
COUT C3 22 uF C3225X7R1C226K TDK
COUT C4 22 uF C3225X7R1C226K TDK
CFF C5 3.9 nF GRM188R71H392KA01D Murata
Catch Diode D1 Schottky Diode Vf = 0.32V CMS06 Toshiba
Inductor L1 1.8 µH CDRH5D18BHPNP Sumida
Feedback Resistor R1 12 kΩ CRCW060312K0FKEA Vishay
Feedback Resistor R2 15 kΩ CRCW060315K0FKEA Vishay
LMR12015 LMR12020 30197015.gifFigure 42. VIN = 3.3 - 9 V, VOUT = 1.2 V, ƒSW = 2 MHz, IOUT = Full Load

Table 8. Bill Of Materials For Figure 42

PART NAME PART ID PART VALUE PART NUMBER MANUFACTURER
Buck Regulator U1 1.5 or 2A Buck Regulator LMR12015/20 Texas Instruments
CPVIN C1 10 µF GRM32DR71E106KA12L Murata
CBOOST C2 0.1 µF GRM188R71C104KA01D Murata
COUT C3 47 µF GRM32ER61A476KE20L Murata
COUT C4 22 µF C3225X7R1C226K TDK
CFF C5 NOT MOUNTED
Catch Diode D1 Schottky Diode Vf = 0.32V CMS06 Toshiba
Inductor L1 0.56 µH CDRH2D18/HPNP Sumida
Feedback Resistor R1 1.02 kΩ CRCW06031K02FKEA Vishay
Feedback Resistor R2 5.10 kΩ CRCW06035K10FKEA Vishay