SNVSC41 November   2023 LMR36500

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD (Commercial) Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 System Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Enable, Shutdown, and Start-up
      2. 7.3.2 Adjustable Switching Frequency (with RT)
      3. 7.3.3 Power-Good Output Operation
      4. 7.3.4 Internal LDO, VCC UVLO, and VOUT/FB Input
      5. 7.3.5 Bootstrap Voltage and VBOOT-UVLO (BOOT Terminal)
      6. 7.3.6 Output Voltage Selection
      7. 7.3.7 Soft Start and Recovery from Dropout
        1. 7.3.7.1 Soft Start
        2. 7.3.7.2 Recovery from Dropout
      8. 7.3.8 Current Limit and Short Circuit
      9. 7.3.9 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Standby Mode
      3. 7.4.3 Active Mode
        1. 7.4.3.1 CCM Mode
        2. 7.4.3.2 AUTO Mode - Light Load Operation
          1. 7.4.3.2.1 Diode Emulation
          2. 7.4.3.2.2 Frequency Reduction
        3. 7.4.3.3 FPWM Mode - Light Load Operation
        4. 7.4.3.4 Minimum On-time Operation
        5. 7.4.3.5 Dropout
  9. 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  Choosing the Switching Frequency
        2. 8.2.2.2  Setting the Output Voltage
          1. 8.2.2.2.1 VOUT / FB for Adjustable Output
        3. 8.2.2.3  Inductor Selection
        4. 8.2.2.4  Output Capacitor Selection
        5. 8.2.2.5  Input Capacitor Selection
        6. 8.2.2.6  CBOOT
        7. 8.2.2.7  VCC
        8. 8.2.2.8  CFF Selection
        9. 8.2.2.9  External UVLO
        10. 8.2.2.10 Maximum Ambient Temperature
      3. 8.2.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Ground and Thermal Considerations
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Device Nomenclature
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

6.6 System Characteristics

The following specifications apply only to the typical applications circuit, with nominal component values. Specifications in the typical (TYP) column apply to TJ = 25°C only. Specifications in the minimum (MIN) and maximum (MAX) columns apply to the case of typical components over the temperature range of TJ = –40°C to 150°C. These specifications are not ensured by production testing.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
STANDBY CURRENT
ISUPPLY Input supply current when in regulation VIN = 13.5 V, VOUT/FB = 3.3 V, IOUT = 0 A, PFM mode 6.5 µA
ISUPPLY Input supply current when in regulation VIN = 24 V, VOUT/FB = 3.3 V, IOUT = 0 A, PFM mode 4 µA
OUTPUT VOLTAGE ACCURACY (VOUT/FB)
VOUT_3p3V_ACC VOUT = 3.3-V, VIN = 3.6 V to 65 V, IOUT = 0 A to full load (2) FPWM mode –1.5 1.5 %
VOUT_3p3V_ACC VOUT = 3.3-V, VIN = 3.6 V to 65 V, IOUT = 0 A to full load (2) AUTO mode –1.5 2.5 %
VOUT_5p0V_ACC VOUT = 5-V, VIN = 5.5 V to 65 V, IOUT = 0 A to full load (2) (3) FPWM mode –1.5 1.5 %
VOUT_5p0V_ACC VOUT = 5-V, VIN = 5.5 V to 65 V, IOUT = 0 A to full load (2) (3) AUTO mode –1.5 2.5 %
PWM LIMITS (SW)
tOFF-MIN Minimum switch off-time IOUT = 50 mA 70 ns
tON-MAX Maximum switch on-time IOUT = 50 mA 4.4 µs
FMIN Minimum switching frequency Drop-out 223 kHz
DMAX Maximum switch duty cycle (1) Drop-out 98%
THERMAL SHUTDOWN
TSD-R Thermal shutdown rising Shutdown threshold 158 168 180 °C
TSD-HYS Thermal shutdown hysteresis 8 10 15 °C
(1) In dropout the switching frequency drops to increase the effective duty cycle. The lowest frequency is clamped at approximately:    fMIN = 1 / (tON-MAX + TOFF-MIN). DMAX = (tON-MAX) / (tON-MAX + tOFF-MIN).
(2) Deviation is with respect to VIN = 13.5 V.
(3) Preview.