SNVSB52A September   2018  – August 2021 LM34936

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Fixed Frequency Valley/Peak Current Mode Control with Slope Compensation
      2. 7.3.2  VCC Regulator and Optional BIAS Input
      3. 7.3.3  Enable/UVLO
      4. 7.3.4  Soft-Start
      5. 7.3.5  Overcurrent Protection
      6. 7.3.6  Average Input/Output Current Limiting
      7. 7.3.7  Operation Above 28-V Input
      8. 7.3.8  CCM Operation
      9. 7.3.9  Frequency and Synchronization (RT/SYNC)
      10. 7.3.10 Frequency Dithering
      11. 7.3.11 Output Overvoltage Protection (OVP)
      12. 7.3.12 Power Good (PGOOD)
      13. 7.3.13 Gm Error Amplifier
      14. 7.3.14 Integrated Gate Drivers
      15. 7.3.15 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown, Standby, and Operating Modes
      2. 7.4.2 MODE Pin Configuration
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Custom Design with WEBENCH Tools
        2. 8.2.2.2  Frequency
        3. 8.2.2.3  VOUT
        4. 8.2.2.4  Inductor Selection
        5. 8.2.2.5  Output Capacitor
        6. 8.2.2.6  Input Capacitor
        7. 8.2.2.7  Sense Resistor (RSENSE)
        8. 8.2.2.8  Slope Compensation
        9. 8.2.2.9  UVLO
        10. 8.2.2.10 Soft-Start Capacitor
        11. 8.2.2.11 Dither Capacitor
        12. 8.2.2.12 MOSFETs QH1 and QL1
        13. 8.2.2.13 MOSFETs QH2 and QL2
        14. 8.2.2.14 Frequency Compensation
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
        1. 11.1.2.1 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
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.6 Typical Characteristics

At TA = 25°C, unless otherwise stated.

GUID-A916E07A-044A-4988-8807-A71334E19B5E-low.gif
VOUT=12 VFsw=300 kHzL1=4.7 μH
IOUT=5 A
Figure 6-1 Efficiency vs VIN
GUID-4A61275B-91F7-4436-B0E4-2C2C4B66CF42-low.gifFigure 6-3 Oscillator Frequency
GUID-F63FDAFD-624B-4B94-A2F7-3B204EFE6EAC-low.gifFigure 6-5 IIN Operating vs VIN
GUID-AC4716FA-543E-41A9-8132-A0FEBC42C3A9-low.gifFigure 6-7 ENABLE/UVLO Rising Threshold vs Temperature
GUID-F6662C46-8172-4120-9AF1-74AEE37A1815-low.gifFigure 6-9 Boost Current Limit vs Temperature
GUID-575B7D22-9B1B-473B-800A-743E66A7AC0F-low.gif
VOUT=12 VVIN=11 V
Figure 6-11 Forced CCM Operation (Buck-Boost)
GUID-E971A287-6D07-49E1-AD81-7FEDE82FE249-low.gif
VOUT=12 VVIN=13 V
Figure 6-13 Forced CCM Operation (Buck-Boost)
GUID-D6729324-4E03-4D03-A143-FC6D41E8099E-low.gif
VIN=6 VVOUT=12 VLoad 3A to 6A
Figure 6-15 Load Step (Boost)
GUID-2D45EF40-907B-471A-9F40-21DC609D2C62-low.gif
VIN=24 VVOUT=12 VLoad 3A to 6A
Figure 6-17 Load Step (Buck)
GUID-62749E3F-BAF2-40C5-9CCD-BAAB32FE79A1-low.gif
VIN=24 VVOUT=12 VHiccup Enabled
Figure 6-19 Hiccup Mode Current Limit
GUID-3917E98C-32B8-4DDE-AB71-E89C06AFE5B5-low.gif
VOUT =12 V Fsw=300 kHz L1=4.7 μH
Figure 6-2 Efficiency vs Load
GUID-8399C26F-02F0-4C59-A677-55F76B0FF9BE-low.gifFigure 6-4 VCC vs VIN
GUID-33066ABB-1E10-4235-B357-145EAD1A98DC-low.gifFigure 6-6 IIN Shutdown vs VIN
GUID-473CB827-321A-4633-AD93-67B71EE2367D-low.gifFigure 6-8 Buck Current Limit vs Temperature
GUID-A78ED4CF-FC2C-4645-94B3-A6FE189A510F-low.gif
VOUT=12 VVIN=6 V
Figure 6-10 Forced CCM Operation (Boost)
GUID-177A9F82-BDCB-4CD1-BFF1-8D88F34873A1-low.gif
VOUT=12 VVIN=12 V
Figure 6-12 Forced CCM Operation (Buck-Boost)
GUID-EE430601-F09D-4D64-AC25-AF53ED84FF11-low.gif
VOUT=12 VVIN=24 V
Figure 6-14 Forced CCM Operation (Buck)
GUID-973F2C90-4B9F-4A97-87AC-0191DA412782-low.gif
VIN=12 VVOUT=12 VLoad 3A to 6A
Figure 6-16 Load Step (Buck-Boost)
GUID-A127F58D-65BE-4762-BB23-4D6A22BB8980-low.gif
VIN=8 V to 24 VVOUT=12 VIOUT=3A
Figure 6-18 Line Transient
GUID-6DA0841B-7A51-40D4-AB7A-5F554E54DE94-low.gif
VIN=24 VRSNS=10 mΩ
Figure 6-20 Constant Current Constant Voltage (CCCV) Operation