SNVS581M February   2013  – October 2020 LM22679 , LM22679-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings: LM22679
    3. 6.3 Handling Ratings: LM22679-Q1
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Thermal Information
    6. 6.6 Electrical Characteristics
    7. 6.7 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 UVLO
      2. 7.3.2 Soft-Start
      3. 7.3.3 Bootstrap Supply
      4. 7.3.4 Internal Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active Mode
      3. 7.4.3 Current Limit
      4. 7.4.4 Current Limit Adjustment
      5. 7.4.5 Thermal Protection
      6. 7.4.6 Duty-Cycle Limits
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Output Voltage Divider Selection
      2. 8.1.2 Power Diode
    2. 8.2 Typical Application
      1. 8.2.1 Typical Buck Regulator Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 External Components
          2. 8.2.1.2.2 Inductor
          3. 8.2.1.2.3 Input Capacitor
          4. 8.2.1.2.4 Output Capacitor
          5. 8.2.1.2.5 Bootstrap Capacitor
        3. 8.2.1.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Support Resources
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Trademarks
    5. 11.5 Glossary
    6. 11.6 Electrostatic Discharge Caution

Package Options

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

6.6 Electrical Characteristics

Typical values represent the most likely parametric norm at TA = TJ = 25°C, and are provided for reference purposes only. Unless otherwise specified: VIN = 12 V.
PARAMETERTEST CONDITIONSMIN(1)TYP(2)MAX(1)UNIT
LM22679-5.0
VFBFeedback VoltageVIN = 8 V to 42 V4.9255.05.075V
VIN = 8 V to 42 V, –40°C ≤ TJ ≤ 125°C4.95.1
LM22679-ADJ
VFBFeedback VoltageVIN = 4.7 V to 42 V1.2661.2851.304 V
VIN = 4.7 V to 42 V, –40°C ≤ TJ ≤ 125°C1.2591.311
ALL OUTPUT VOLTAGE VERSIONS
IQQuiescent CurrentVFB = 5 V3.4mA
VFB = 5 V, –40°C ≤ TJ ≤ 125°C6
VADJCurrent Limit Adjust Voltage0.8V
0.650.9
–40°C ≤ TJ ≤ 125°C
ICLCurrent Limit6.07.18.4A
–40°C ≤ TJ ≤ 125°C5.758.75
ILOutput Leakage CurrentVIN = 42 V, SS Pin = 0 V, VSW = 0 V3260µA
VSW = –1 V3175µA
RDS(ON)Switch On-Resistance0.100.14Ω
0.2
fOOscillator Frequency500kHz
–40°C ≤ TJ ≤ 125°C400600
TOFFMINMinimum Off-time200ns
–40°C ≤ TJ ≤ 125°C100300
TONMINMinimum On-time100ns
IBIASFeedback Bias CurrentVFB = 1.3 V (ADJ Version Only)230nA
ISSSoft-start Current50µA
–40°C ≤ TJ ≤ 125°C3070
TSDThermal Shutdown Threshold150°C
(1) MIN and MAX limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate TI's Average Outgoing Quality Level (AOQL).
(2) Typical values represent most likely parametric norms at the conditions specified and are not ensured.