SNVS485I June   2007  – September 2018 LM2735

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Boost Application Circuit
      2.      Efficiency vs Load Current VO = 12 V
  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 ESD Ratings: LM2735
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
      1. 7.1.1 Theory of Operation
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Current Limit
      2. 7.3.2 Thermal Shutdown
      3. 7.3.3 Soft Start
      4. 7.3.4 Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Enable Pin and Shutdown Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1  LM2735X SOT-23 Design Example 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 Inductor Selection
          3. 8.2.1.2.3 Input Capacitor
          4. 8.2.1.2.4 Output Capacitor
          5. 8.2.1.2.5 Setting the Output Voltage
        3. 8.2.1.3 Application Curves
      2. 8.2.2  LM2735Y SOT-23 Design Example 2
      3. 8.2.3  LM2735X WSON Design Example 3
      4. 8.2.4  LM2735Y WSON Design Example 4
      5. 8.2.5  LM2735Y MSOP-PowerPAD Design Example 5
      6. 8.2.6  LM2735X SOT-23 Design Example 6
      7. 8.2.7  LM2735Y SOT-23 Design Example 7
      8. 8.2.8  LM2735X SOT-23 Design Example 8
      9. 8.2.9  LM2735Y SOT-23 Design Example 9
      10. 8.2.10 LM2735X WSON Design Example 10
      11. 8.2.11 LM2735Y WSON Design Example 11
      12. 8.2.12 LM2735X WSON SEPIC Design Example 12
      13. 8.2.13 LM2735Y MSOP-PowerPAD SEPIC Design Example 13
      14. 8.2.14 LM2735X SOT-23 LED Design Example 14
      15. 8.2.15 LM2735Y WSON FlyBack Design Example 15
      16. 8.2.16 LM2735X SOT-23 LED Design Example 16 VRAIL > 5.5 V Application
      17. 8.2.17 LM2735X SOT-23 LED Design Example 17 Two-Input Voltage Rail Application
      18. 8.2.18 SEPIC Converter
        1. 8.2.18.1 Detailed Design Procedure
          1. 8.2.18.1.1 SEPIC Design Guide
          2. 8.2.18.1.2 Small Ripple Approximation
          3. 8.2.18.1.3 Steady State Analysis With Loss Elements
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 WSON Package
    2. 10.2 Layout Examples
    3. 10.3 Thermal Considerations
      1. 10.3.1 Definitions
      2. 10.3.2 PCB Design With Thermal Performance in Mind
      3. 10.3.3 LM2735 Thermal Models
      4. 10.3.4 Calculating Efficiency, and Junction Temperature
        1. 10.3.4.1 Example Efficiency Calculation
      5. 10.3.5 Calculating RθJA and RΨJC
        1. 10.3.5.1 Procedure
        2. 10.3.5.2 Example From Previous Calculations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
        1. 11.1.2.1 Custom Design With WEBENCH® Tools
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.5 Electrical Characteristics

Limits are for TJ = 25°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. VIN = 5 V unless otherwise indicated under the Conditions column.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VFB Feedback Voltage –40°C ≤ to TJ ≤ 125°C (SOT-23) TJ = 25°C 1.255 V
TJ = –40°C to 125°C 1.23 1.28
0°C ≤ to TJ ≤ 125°C (SOT-23) TJ = 25°C 1.255
TJ = 0°C to 125°C 1.236 1.274
–40°C ≤ to TJ ≤ 125°C (WSON) TJ = 25°C 1.255
TJ = –40°C to 125°C 1.225 1.285
0°C ≤ to TJ ≤ 125°C (WSON) TJ = 25°C 1.255
TJ = 0°C to 125°C 1.229 1.281
–40°C ≤ to TJ ≤ 125°C
(MSOP-PowerPAD)		 TJ = 25°C 1.255
TJ = –40°C to 125°C 1.22 1.29
0°C ≤ to TJ ≤ 125°C (MSOP-PowerPAD) TJ = 25°C 1.255
TJ = 0°C to 125°C 1.23 1.28
ΔVFB/VIN Feedback Voltage Line Regulation VIN = 2.7 V to 5.5 V 0.06 %/V
IFB Feedback Input Bias Current TJ = 25°C 0.1 µA
TJ = –40°C to 125°C 1
FSW Switching Frequency LM2735-X TJ = 25°C 1600 kHz
TJ = –40°C to 125°C 1200 2000
LM2735-Y TJ = 25°C 520
TJ = –40°C to 125°C 360 680
DMAX Maximum Duty Cycle LM2735-X TJ = 25°C 96%
TJ = –40°C to 125°C 88%
LM2735-Y TJ = 25°C 99%
TJ = –40°C to 125°C 91%
DMIN Minimum Duty Cycle LM2735-X 5%
LM2735-Y 2%
RDS(ON) Switch ON-Resistance SOT-23 and MSOP-PowerPAD TJ = 25°C 170 mΩ
TJ = –40°C to 125°C 330
WSON TJ = 25°C 190
TJ = –40°C to 125°C 350
ICL Switch Current Limit TJ = 25°C 3 A
TJ = –40°C to 125°C 2.1
SS Soft Start 4 ms
IQ Quiescent Current (switching) LM2735-X TJ = 25°C 7 mA
TJ = –40°C to 125°C 11
LM2735-Y TJ = 25°C 3.4
TJ = –40°C to 125°C 7
Quiescent Current (shutdown) All Options VEN = 0 V 80 nA
UVLO Undervoltage Lockout VIN Rising TJ = 25°C 2.3 V
TJ = –40°C to 125°C 2.65
VIN Falling TJ = 25°C 1.9
TJ = –40°C to 125°C 1.7
VEN_TH Shutdown Threshold Voltage See(1), TJ = –40°C to 125°C 0.4 V
Enable Threshold Voltage See(1), TJ = –40°C to 125°C 1.8
I-SW Switch Leakage VSW = 24 V 1 µA
I-EN Enable Pin Current Sink/Source 100 nA
TSD Thermal Shutdown Temperature(1) 160 °C
Thermal Shutdown Hysteresis 10
(1) Thermal shutdown will occur if the junction temperature exceeds the maximum junction temperature of the device.