SNVSAW1E February   2018  – November 2020 LMR33620

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Characteristics
    7. 7.7 System Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Power-Good Flag Output
      2. 8.3.2 Enable and Start-up
      3. 8.3.3 Current Limit and Short Circuit
      4. 8.3.4 Undervoltage Lockout and Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Auto Mode
      2. 8.4.2 Dropout
      3. 8.4.3 Minimum Switch On-Time
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1  Custom Design With WEBENCH® Tools
        2. 9.2.2.2  Choosing the Switching Frequency
        3. 9.2.2.3  Setting the Output Voltage
        4. 9.2.2.4  Inductor Selection
        5. 9.2.2.5  Output Capacitor Selection
        6. 9.2.2.6  Input Capacitor Selection
        7. 9.2.2.7  CBOOT
        8. 9.2.2.8  VCC
        9. 9.2.2.9  CFF Selection
        10. 9.2.2.10 External UVLO
        11. 9.2.2.11 Maximum Ambient Temperature
      3. 9.2.3 Application Curves
    3. 9.3 What to Do and What Not to Do
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Ground and Thermal Considerations
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RNX|12
  • DDA|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.2.3 Application Curves

Unless otherwise specified the following conditions apply: VIN = 12 V, TA = 25°C. The circuit is shown in Figure 9-31, with the appropriate BOM from Table 9-3 or Table 9-4.

GUID-F345A078-6A5D-4E02-AAE1-24DB7F6E6CC3-low.png
VOUT = 5 V 400 kHz DDA Package
Figure 9-7 Efficiency
GUID-FF2016AA-13DA-46E7-B9EA-2E3C493FE7D7-low.png
VOUT = 5 V 1.4 MHz DDA Package
Figure 9-9 Efficiency
GUID-74D0EDBC-FF0E-442C-9176-D953F75DE072-low.png
VOUT = 5 V 2.1 MHz DDA Package
Figure 9-11 Efficiency
GUID-F2F3DFB4-8D48-409E-8743-274DB0431447-low.png
VOUT = 5 V 400 kHz RNX Package
Figure 9-13 Efficiency
GUID-87A412E0-CB0F-4023-B283-4AC9F0DFBB4D-low.png
VOUT = 5 V 1.4 MHz RNX Package
Figure 9-15 Efficiency
GUID-4A6BA5A4-5745-4443-8D7C-1499EC62CBBB-low.png
VOUT = 5 V 2.1 MHz RNX Package
Figure 9-17 Efficiency
GUID-F293F62F-2DAA-436E-A778-9C16881E8F38-low.png
VOUT = 5 V
Figure 9-19 Line and Load Regulation
GUID-2DABF115-476E-45DF-BF04-1337FAD269B8-low.png
VOUT = 5 V ƒSW = 400 kHz
Figure 9-21 Mode Change Thresholds
GUID-73797D11-E2E2-4F95-8B2E-5ABF10372168-low.gif
VIN = 12 V VOUT = 5 V
tf = tr = 2 µs IOUT = 0 A to 2 A
Figure 9-23 Load Transient
GUID-9C00D07D-E445-4CBE-920B-95DEE942C02E-low.png
VOUT = 3.3 V
Figure 9-25 Line and Load Regulation
GUID-8BA29B07-6040-4C0B-8158-BCEC0F7C0019-low.png
VOUT = 3.3 V ƒSW = 400 kHz
Figure 9-27 Mode Change Thresholds
GUID-21B51A4E-1CC0-4227-B817-53E6DE5D9387-low.gif
VIN = 12 V VOUT = 3.3 V
tf = tr = 2 µs IOUT = 0 A to 2 A
Figure 9-29 Load Transient
GUID-700E717A-7971-4C69-9132-0266B161DCE4-low.png
VOUT = 3.3 V 400 kHz DDA Package
Figure 9-8 Efficiency
GUID-257881C2-EC1A-44E6-BBD2-E8E35317D385-low.png
VOUT = 3.3 V 1.4 MHz DDA Package
Figure 9-10 Efficiency
GUID-782F26D3-25AA-4AA8-9417-2BC6D94CC013-low.png
VOUT = 3.3 V 2.1 MHz DDA Package
Figure 9-12 Efficiency
GUID-59EEE69E-D55A-494E-924D-6B25B150E871-low.png
VOUT = 3.3 V 400 kHz RNX Package
Figure 9-14 Efficiency
GUID-DAFF0737-CED4-467A-A7F5-608CC5D6A7EA-low.png
VOUT = 3.3 V 1.4 MHz RNX Package
Figure 9-16 Efficiency
GUID-4BA967E9-D13B-4E9B-BC2C-40CB163D4A13-low.png
VOUT = 3.3 V 2.1 MHz RNX Package
Figure 9-18 Efficiency
GUID-D1860B17-E49A-4DCB-B808-AF0AF707A413-low.png
VOUT = 5 V RFBT = 1 MΩ IOUT = 0 A
Figure 9-20 Input Supply Current
GUID-4B03D47B-048B-4D97-A87E-6FF9ECB5C19D-low.png
VOUT = 5 V ƒSW = 400 kHz
Figure 9-22 Switching Frequency versus Output Current
GUID-774173B5-AD49-4CDB-8543-FE1970F73CA8-low.gif
VIN = 12 V VOUT = 5 V
tf = tr = 2 µs IOUT = 1 A to 2 A
Figure 9-24 Load Transient
GUID-D8AFB934-105A-497A-9598-4266421D36B1-low.png
VOUT = 3.3 V IOUT = 0 A RFBT = 1 MΩ
Figure 9-26 Input Supply Current
GUID-C95F2C7A-E827-415B-9958-6A0A49BDFC02-low.png
VOUT = 3.3 V ƒSW = 400 kHz
Figure 9-28 Switching Frequency versus Output Current
GUID-1A8E9AD2-9A28-4775-AB74-D4AB7FEFC39F-low.gif
VIN = 12 V VOUT = 3.3 V IOUT = 1 A to 2 A
tf = tr = 2 µs
Figure 9-30 Load Transient
GUID-10219432-3939-46B7-8D90-8CBE0FFA1229-low.gifFigure 9-31 Circuit for Application Curves
Table 9-3 BOM for Typical Application Curves DDA Package
VOUT(1) FREQUENCY RFBB COUT CIN + CHF L U1
3.3 V 400 kHz 43.3 kΩ 4 × 22 µF 1 × 10 µF + 1 × 220 nF 6.8 µH, 14 mΩ LMR33620ADDA
3.3 V 1400 KHz 43.3 kΩ 4 × 22 µF 1 × 10 µF + 1 × 220 nF 2.2 µH, 11.4 mΩ LMR33620BDDA
3.3 V 2100 kHz 43.3 kΩ 4 × 22 µF 1 × 10 µF + 1 × 220 nF 1.2 µH, 16 mΩ LMR33620CDDA
5 V 400 kHz 24.9 kΩ 4 × 22 µF 1 × 10 µF + 1 × 220 nF 8.2 µH, 14 mΩ LMR33620ADDA
5 V 1400 KHz 24.9 kΩ 4 × 22 µF 1 × 10 µF + 1 × 220 nF 2.2 µH, 11.4 mΩ LMR33620BDDA
5 V 2100 kHz 24.9 kΩ 4 × 22 µF 1 × 10 µF + 1 × 220 nF 1.5 µH, 8.2 mΩ LMR33620CDDA
(1) The values in this table were selected to enhance certain performance criteria and may not represent typical values.
Table 9-4 BOM for Typical Application Curves RNX Package
VOUT(1) FREQUENCY RFBB COUT CIN + CHF L U1
3.3 V 400 kHz 43.3 kΩ 4 × 22 µF 2 × 4.7 µF + 2 × 100 nF 4.7 µH, 28 mΩ LMR33620ARNX
3.3 V 1400 KHz 43.3 kΩ 4 × 22 µF 2 × 4.7 µF + 2 × 100 nF 2.2 µH, 11.4 mΩ LMR33620BRNX
3.3 V 2100 kHz 43.3 kΩ 4 × 22 µF 2 × 4.7 µF + 2 × 100 nF 2.2 µH, 11.4 mΩ LMR33620CRNX
5 V 400 kHz 24.9 kΩ 4 × 22 µF 2 × 4.7 µF + 2 × 100 nF 6.8 µH, 14 mΩ LMR33620ARNX
5 V 1400 KHz 24.9 kΩ 4 × 22 µF 2 × 4.7 µF + 2 × 100 nF 2.2 µH, 11.4 mΩ LMR33620BRNX
5 V 2100 kHz 24.9 kΩ 4 × 22 µF 2 × 4.7 µF + 2 × 100 nF 2.2 µH, 11.4 mΩ LMR33620CRNX
(1) The values in this table were selected to enhance certain performance criteria and may not represent typical values.