SNVS625G February   2011  – March 2022 LM21215

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 Ratings
    4. 6.4 Electrical Characteristics
    5. 6.5 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 Precision Enable
      2. 7.3.2 UVLO
      3. 7.3.3 Current Limit
      4. 7.3.4 Short-Circuit Protection
      5. 7.3.5 Thermal Protection
      6. 7.3.6 Light Load Operation
      7. 7.3.7 Power Good Flag
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Typical Application 1
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2 Output Voltage
          3. 8.2.1.2.3 Precision Enable
          4. 8.2.1.2.4 Soft Start
          5. 8.2.1.2.5 Inductor Selection
          6. 8.2.1.2.6 Output Capacitor Selection
          7. 8.2.1.2.7 Input Capacitor Selection
          8. 8.2.1.2.8 Programmable Current Limit
          9. 8.2.1.2.9 Control Loop Compensation
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Typical Application Schematic 2
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
  9. 9 Layout
    1. 9.1 Layout Considerations
    2. 9.2 Layout Example
      1. 9.2.1 Thermal Considerations
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
      2. 10.1.2 Development Support
        1. 10.1.2.1 Custom Design With WEBENCH® Tools
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

6.4 Electrical Characteristics

Unless otherwise stated, the following conditions apply: VPVIN, AVIN = 5 V. Limits in standard type are for TJ = 25°C only, limits in boldface type apply over the junction temperature (TJ) range of −40°C to +125°C. 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.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
SYSTEM
VFBFeedback pin voltageVIN = 2.95V to 5.5V-1%0.61%V
ΔVOUT/ΔIOUTLoad Regulation0.02%VOUT/A
ΔVOUT/ΔVINLine Regulation0.1%VOUT/V
RDSON HSHigh Side Switch On ResistanceISW = 12A79.0mΩ
RDSON LSLow Side Switch On ResistanceISW = 12A4.36.0mΩ
ICLRHS Rising Switch Current LimitRILIM = 16.5 kΩ16.52023.5A
RILIM = 41.3 kΩ8.51011.5
RILIM = 130 kΩ3.8
ICLFLS Falling Switch Current LimitRILIM = 16.5 kΩ14.5A
RILIM = 41.3 kΩ7.5
RILIM = 130 kΩ3
VZXZero Cross Voltage-8312mV
IQOperating Quiescent Current1.53mA
ISDShutdown Quiescent CurrentVEN = 0V5070µA
VUVLOAVIN Under Voltage LockoutAVIN Rising2.452.72.95V
VUVLOHYSAVIN Under Voltage Lockout Hysteresis140200280mV
VTRACKOSSS/TRACK PIN accuracy (VSS - VFB)0 < VTRACK < 0.55V-10620mV
ISSSoft-Start Pin Source Current1.31.92.5µA
tINTSSInternal Soft-Start Ramp to VrefCSS = 0350500675µs
tRESETSSDevice reset to soft-start ramp50110200µs
OSCILLATOR
fOSCSwitching Frequency475500525kHz
tHSBLANKHS OCP blanking timeRising edge of SW to ICLR comparison55ns
tLSBLANKLS OCP blanking timeFalling edge of SW to ICLF comparison400ns
tZXBLANKZero Cross blanking timeFalling edge of SW to VZX comparison120ns
tMINONMinimum HS on-time140ns
ΔVRAMPPWM Ramp p-p Voltage0.8V
ERROR AMPLIFIER
VOLError Amplifier Open Loop Voltage GainICOMP = -65µA to 1mA95dBV/V
GBWError Amplifier Gain-Bandwidth Product11MHz
IFBFeedback Pin Bias CurrentVFB = 0.6V1nA
ICOMPSRCCOMP Output Source Current1mA
ICOMPSINKCOMP Output Sink Current65µA
POWERGOOD
VOVPOvervoltage Protection Rising ThresholdVFB Rising105112.5120%VFB
VOVPHYSOvervoltage Protection HysteresisVFB Falling2%VFB
VUVPUndervoltage Protection Rising ThresholdVFB Rising829097%VFB
VUVPHYSUndervoltage Protection HysteresisVFB Falling2.5%VFB
tPGDGLPGOOD Deglitch Low (OVP/UVP Condition Duration to PGOOD Falling)15µs
tPGDGHPGOOD Deglitch High (minimum low pulse)12µs
RPDPGOOD Pulldown Resistance102040Ω
IPGOODLEAKPGOOD Leakage CurrentVPGOOD = 5V1nA
LOGIC
VIHENREN Pin Rising ThresholdVEN Rising1.201.351.45V
VENHYSEN Pin Hysteresis50110180mV
IENEN Pin Pullup CurrentVEN = 0V2µA
THERMAL SHUTDOWN
TTHERMSDThermal Shutdown165°C
TTHERMSDHYSThermal Shutdown Hysteresis10°C