SNAS660D June   2015  – May 2021 LM53600-Q1 , LM53601-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison
  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 System Characteristics
    7. 7.7 Timing Requirements
    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 Control Scheme
      2. 8.3.2 Soft-Start Function
      3. 8.3.3 Current Limit
      4. 8.3.4 Hiccup Mode
      5. 8.3.5 RESET Function
      6. 8.3.6 Forced PWM Operation
      7. 8.3.7 Auto Mode Operation and IQ_VIN
      8. 8.3.8 SYNC Operation
      9. 8.3.9 Spread Spectrum
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown
      2. 8.4.2 FPWM Operation
      3. 8.4.3 Auto Mode Operation
  9. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Off-Battery 5-V, 1-A Output Automotive Converter with Spread Spectrum
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Inductor Selection
          2. 9.2.1.2.2 Output Capacitor Selection
          3. 9.2.1.2.3 Input Capacitor Selection
          4. 9.2.1.2.4 FB Voltage Divider for Adjustable Versions
          5. 9.2.1.2.5 RPU - RESET Pull Up Resistor
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Off-Battery 3.3 V, 1 A Output Automotive Converter with Spread Spectrum
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Design Procedure
        3. 9.2.2.3 Application Curves
    3. 9.3 Do's and Don't's
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Ground and Thermal Plane Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

The LM53600-Q1 and LM53601-Q1 devices run in current mode and has internal compensation. This compensation is stable with inductance between 4 µH and 10 µH. For most applications, 4.7 µH should be used with fixed 5-V and 3.3-V versions of the LM53600-Q1 and LM53601-Q1 devices. The output inductor is limited by current ripple while operating at high input voltage to a minimum rating of 4.7 µH for 3.3 V and 5-V fixed output devices. Since adjustable devices operate at the same frequency under high input voltage conditions as devices set to deliver 3.3 V, inductor current ripple at high input voltages can become excessive while using a 4.7µH while using an adjustable device that is delivering output voltage above 4.2 V. 6.8 µH is recommended if an adjustable device is used to produce output voltage above 4.2 V. Not exceeding 6.8 µH is recommended since use of large inductance causes poor transient load response. For the LM53601-Q1 (1-A output), a saturation rating of about 2 A is recommended since this is the maximum current limit rating. Likewise, a saturation current rating of about 1.5 A is recommended for the LM53600-Q1. See IL_HS in the data sheet.

Table 9-2 Output Inductor
PART TYPERECOMMENDED INDUCTANCE RATING(1)RECOMMENDED MINIMUM SATURATION CURRENT(2)COMMENT
LM53601-Q1 3.3 V and 5 V4.7 µHabout 2 A6.8 µH works in systems with less demanding transient load requirements
LM53601-Q1 ADJ set to ≤ 4.2-V output4.7 µHabout 2 A
LM53601-Q1 ADJ set to > 4.2-V output6.8 µHabout 2 A
LM53600-Q1 3.3 V and 5 V4.7 µHabout 1.5 AUp to 10 µH works in systems with less demanding transient load requirements
LM53600-Q1 ADJ set to ≤ 4.2-V output4.7 µHabout 1.5 A
LM53600-Q1 ADJ set to > 4.2-V output6.8 µHabout 1.5 A
(1) The values shown in this table are standard inductance ratings. The LM53600-Q1/LM53601-Q1 tolerates reduced inductance due to DC current and temperature.
(2) The LM53600-Q1/LM53601-Q1 tolerates partial saturation of inductors (reduction of ~40% reduction of inductance of the current value listed due to saturation. Partial saturation may reduce maximum current available at maximum voltage).