SNVSAA7B December   2015  – July 2021 LM53625-Q1 , LM53635-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 Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
      1. 8.2.1 Control Scheme
    3. 8.3 Feature Description
      1. 8.3.1 RESET Flag Output
      2. 8.3.2 Enable and Start-Up
      3. 8.3.3 Soft-Start Function
      4. 8.3.4 Current Limit
      5. 8.3.5 Hiccup Mode
      6. 8.3.6 Synchronizing Input
      7. 8.3.7 Undervoltage Lockout (UVLO) and Thermal Shutdown (TSD)
      8. 8.3.8 Input Supply Current
    4. 8.4 Device Functional Modes
      1. 8.4.1 AUTO Mode
      2. 8.4.2 FPWM Mode
      3. 8.4.3 Dropout
      4. 8.4.4 Input Voltage Frequency Foldback
    5. 8.5 Spread-Spectrum Operation
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 General Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 External Components Selection
            1. 9.2.1.2.1.1 Input Capacitors
              1. 9.2.1.2.1.1.1 Input Capacitor Selection
            2. 9.2.1.2.1.2 Output Inductors and Capacitors Selection
              1. 9.2.1.2.1.2.1 Inductor Selection
              2. 9.2.1.2.1.2.2 Output Capacitor Selection
          2. 9.2.1.2.2 Setting the Output Voltage
            1. 9.2.1.2.2.1 FB for Adjustable Versions
          3. 9.2.1.2.3 VCC
          4. 9.2.1.2.4 BIAS
          5. 9.2.1.2.5 CBOOT
          6. 9.2.1.2.6 Maximum Ambient Temperature
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Fixed 5-V Output for USB-Type Applications
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
      3. 9.2.3 Fixed 3.3-V Output
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
        3. 9.2.3.3 Application Curves
      4. 9.2.4 Adjustable Output
        1. 9.2.4.1 Design Requirements
        2. 9.2.4.2 Detailed Design Procedure
        3. 9.2.4.3 Application Curves
    3. 9.3 What to Do and What Not to Do
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

7.6 System Characteristics

The following specifications are ensured by design provided that the component values in the typical application circuit are used. These parameters are not ensured by production testing. Limits apply over the recommended operating junction temperature range of –40°C to +150°C, unless otherwise noted. Minimum and maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN = 13.5 V.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
VIN-MINMinimum input voltage for full functionality at 1.5 A load, after start-up.VOUT = 3.3 V +2/–3% regulation3.5V
Minimum input voltage for full functionality at maximum rated load 3.5 A after start-up.VOUT = 3.3 V +2/–3% regulation3.9
VOUTOutput voltage for 5-V optionVIN = 5.6 V to 36 V, IOUT = 3.5 A4.92555.08V
Output voltage for 3.3-V optionVIN 3.9 V to 36 V, IOUT = 3.5 A3.243.33.35
Output voltage for 5-V optionVIN = 5.5 V to 36 V, IOUT = 100 µA to 100 mA4.925.055.125
Output voltage for 3.3-V optionVIN = 3.8 V to 36 V, IOUT = 100 µA to 100 mA3.243.333.38
Output voltage for adjustable optionVIN = VOUT + 1 V to 36 V, IOUT = 3.5 A–2.25%2.25%
IQ-VINInput current to VIN pinVIN= 13.5 V, VOUT = 3.3 V, IOUT = 0 A FPWM = 01540µA
VIN = 13.5 V, VOUT = 5.0 V and IOUT = 0 A FPWM = 020
VDROP1Minimum input to output voltage differential to maintain regulation accuracy without inductor DCR dropVOUT = 3.3 V/5 V, IOUT= 3.5 A, +2/–3% output accuracy0.350.6V
VDROP2Minimum input to output voltage differential to maintain FSW ≥ 1.85 MHz without inductor DCR dropVOUT = 3.3 V/5 V, IOUT=3.5 A, FSW = 1.85 MHz, 2% regulation accuracy1.11.4V
EfficiencyTypical Efficiency without inductor lossVIN = 13.5 V, VOUT= 5.0 V, IOUT = 3.5 A90%
VIN = 13.5 V, VOUT = 3.3 V, IOUT = 3.5 A84%
VIN = 13.5 V, VOUT = 5 V, IOUT = 100 mA88%