SNVSB73 September   2018 LM2735-Q1

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
    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-Q1 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-Q1 SOT-23 Design Example 2
      3. 8.2.3  LM2735X-Q1 WSON Design Example 3
      4. 8.2.4  LM2735Y-Q1 WSON Design Example 4
      5. 8.2.5  LM2735X-Q1 SOT-23 Design Example 6
      6. 8.2.6  LM2735Y-Q1 SOT-23 Design Example 7
      7. 8.2.7  LM2735X-Q1 SOT-23 Design Example 8
      8. 8.2.8  LM2735Y-Q1 SOT-23 Design Example 9
      9. 8.2.9  LM2735X-Q1 WSON Design Example 10
      10. 8.2.10 LM2735Y-Q1 WSON Design Example 11
      11. 8.2.11 LM2735X-Q1 WSON SEPIC Design Example 12
      12. 8.2.12 LM2735X-Q1 SOT-23 LED Design Example 14
      13. 8.2.13 LM2735Y-Q1 WSON FlyBack Design Example 15
      14. 8.2.14 LM2735X-Q1 SOT-23 LED Design Example 16 VRAIL > 5.5 V Application
      15. 8.2.15 LM2735X-Q1 SOT-23 LED Design Example 17 Two-Input Voltage Rail Application
      16. 8.2.16 SEPIC Converter
        1. 8.2.16.1 Detailed Design Procedure
          1. 8.2.16.1.1 SEPIC Design Guide
          2. 8.2.16.1.2 Small Ripple Approximation
          3. 8.2.16.1.3 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-Q1 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. 11.2 Custom Design With WEBENCH® Tools
    3. 11.3 Documentation Support
      1. 11.3.1 Related Documentation
    4. 11.4 Receiving Notification of Documentation Updates
    5. 11.5 Community Resources
    6. 11.6 Trademarks
    7. 11.7 Electrostatic Discharge Caution
    8. 11.8 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
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-Q1-X TJ = 25°C 1600 kHz
TJ = –40°C to 125°C 1200 2000
LM2735-Q1-Y TJ = 25°C 520
TJ = –40°C to 125°C 360 680
DMAX Maximum duty cycle LM2735-Q1-X TJ = 25°C 96%
TJ = –40°C to 125°C 88%
LM2735-Q1-Y TJ = 25°C 99%
TJ = –40°C to 125°C 91%
DMIN Minimum duty cycle LM2735-Q1-X 5%
LM2735-Q1-Y 2%
RDS(ON) Switch ON-resistance SOT-23 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-Q1-X TJ = 25°C 7 mA
TJ = –40°C to 125°C 11
LM2735-Q1-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(2) 160 °C
Thermal shutdown hysteresis 10
(1) Do not allow this pin to float or be greater than VIN + 0.3 V.
(2) Thermal shutdown occurs if the junction temperature exceeds the maximum junction temperature of the device.