SNVSCH3A June   2025  – October 2026 LM65625 , LM65635 , LM65645

PRODUCTION DATA  

  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 Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 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 Output Voltage Selection
      2. 7.3.2 EN Pin and Use as VIN UVLO
      3. 7.3.3 Mode Selection
        1. 7.3.3.1 MODE/SYNC Pin Uses for Synchronization
        2. 7.3.3.2 Clock Locking
      4. 7.3.4 Adjustable Switching Frequency
      5. 7.3.5 Dual Random Spread Spectrum (DRSS)
      6. 7.3.6 Internal LDO, VCC UVLO, and BIAS Input
      7. 7.3.7 Bootstrap Voltage (BST Pin)
      8. 7.3.8 Soft Start and Recovery From Dropout
      9. 7.3.9 Safety Features
        1. 7.3.9.1 Power-Good Monitor
        2. 7.3.9.2 Overcurrent and Short-Circuit Protection
        3. 7.3.9.3 Hiccup
        4. 7.3.9.4 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active Mode
        1. 7.4.2.1 Peak Current Mode Operation
        2. 7.4.2.2 Auto Mode Operation
          1. 7.4.2.2.1 Diode Emulation
        3. 7.4.2.3 FPWM Mode Operation
        4. 7.4.2.4 Dropout
        5. 7.4.2.5 Recovery from 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 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Choosing the Switching Frequency
        3. 8.2.2.3 FB for Adjustable or Fixed Output Voltage Mode
        4. 8.2.2.4 Inductor Selection
        5. 8.2.2.5 Output Capacitor Selection
        6. 8.2.2.6 Input Capacitor Selection
        7. 8.2.2.7 CBOOT
        8. 8.2.2.8 External UVLO
        9. 8.2.2.9 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 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    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

8.2.3 Application Curves

Unless otherwise specified the following conditions apply: VIN = 24V, Fixed output voltage mode, BIAS connected to VOUT, TA = 25°C. All data taken on standard EVM. See BOM for Application Curve Data for BOM. See Figure 8-77 and Figure 8-78 for typical EMI filters. Typical system specifications can be found in Table 8-7.

LM65625 LM65635 LM65645 LM6x625 Efficiency - Auto Mode
LM6x625VOUT = 5V400kHz
Figure 8-7 LM6x625 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6x635 Efficiency - Auto Mode
LM6x635VOUT = 5V 2200kHz
Figure 8-9 LM6x635 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Efficiency - Auto Mode
LM6x645VOUT = 5V400kHz
Figure 8-11 LM6x645 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6xx25 Line and Load Regulation - Auto Mode
LM6xx25VOUT = 5V 400kHz
Figure 8-13 LM6xx25 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6xx25 Line and Load Regulation - Auto Mode
LM6x625VOUT = 5V2200kHz
Figure 8-15 LM6xx25 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x635 Line and Load Regulation - Auto Mode
LM6x635VOUT = 5V400kHz
Figure 8-17 LM6x635 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x635 Line and Load Regulation - Auto Mode
LM6x635VOUT = 5V2200kHz
Figure 8-19 LM6x635 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Line and Load Regulation - Auto Mode
LM6x645VOUT = 5V400kHz
Figure 8-21 LM6x645 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Line and Load Regulation - Auto Mode
LM6x645VOUT = 5V2200kHz
Figure 8-23 LM6x645 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6xx25 Efficiency - Auto Mode
LM6xx25VOUT = 3.3V1000kHz
Figure 8-25 LM6xx25 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6xx25 Efficiency - Auto Mode
LM6xx25VOUT = 5V1000kHz
Figure 8-27 LM6xx25 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6x635 Efficiency - Auto Mode
LM6x635VOUT = 3.3V1000kHz
Figure 8-29 LM6x635 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6x635 Efficiency - Auto Mode
LM6x635VOUT = 5V1000kHz
Figure 8-31 LM6x635 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Efficiency - Auto Mode
LM6x645VOUT = 3.3V1000kHz
Figure 8-33 LM6x645 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Efficiency - Auto Mode
LM6x645VOUT = 5V1000kHz
Figure 8-35 LM6x645 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6x625 Line and Load Regulation - Auto Mode
LM6x625VOUT = 3.3V1000kHz
Figure 8-37 LM6x625 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6xx25 Line and Load Regulation - Auto Mode
LM6xx25VOUT = 5V1000kHz
Figure 8-39 LM6xx25 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x635 Line and Load Regulation - Auto Mode
LM6x635VOUT = 3.3V1000kHz
Figure 8-41 LM6x635 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x635 Line and Load Regulation - Auto Mode
LM6x635VOUT = 5V1000kHz
Figure 8-43 LM6x635 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Line and Load Regulation - Auto Mode
LM6x645VOUT = 3.3V1000kHz
Figure 8-45 LM6x645 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Line and Load Regulation - Auto Mode
LM6x645VOUT = 5V1000kHz
Figure 8-47 LM6x645 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6xx25 Switching Frequency vs Load Current
LM6xx25VIN = 24V2200kHzAuto
Figure 8-49 LM6xx25 Switching Frequency vs Load Current
LM65625 LM65635 LM65645 LM6x645 Switching Frequency vs Load Current
LM6x645VIN = 24V400kHzAuto
Figure 8-51 LM6x645 Switching Frequency vs Load Current
LM65625 LM65635 LM65645 LM6xx25 Switching Frequency vs Input Voltage
LM6xx25VOUT = 5V2200kHzFPWM
Figure 8-53 LM6xx25 Switching Frequency vs Input Voltage
LM65625 LM65635 LM65645 LM6x635 Switching Frequency vs Input Voltage
LM6x635VOUT = 5V2200kHzFPWM
Figure 8-55 LM6x635 Switching Frequency vs Input Voltage
LM65625 LM65635 LM65645 LM6x645 Dropout Characteristic
LM6x645VOUT = 3.3V400kHzFPWM
Figure 8-57 LM6x645 Dropout Characteristic
LM65625 LM65635 LM65645 Maximum Output Current
VOUT = 2VFPWM400kHz
Figure 8-59 Maximum Output Current
LM65625 LM65635 LM65645 Input Supply Current - Auto Mode
LM6xx25VOUT = 5VL = 2.2μHVIN = 24V
Figure 8-61 Input Supply Current - Auto Mode
LM65625 LM65635 LM65645 Input Supply Current - Auto Mode
LM6x635VOUT = 5VL = 2.2μHVIN = 24V
Figure 8-63 Input Supply Current - Auto Mode
LM65625 LM65635 LM65645 Input Supply Current - Auto Mode
LM6x645VOUT = 5VL = 8.2μHVIN = 24V
Figure 8-65 Input Supply Current - Auto Mode
LM65625 LM65635 LM65645 No Load Input Supply Current - Auto Mode
LM6x635IOUT = 0AL = 2.2μH
Figure 8-67 No Load Input Supply Current - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Efficiency - VOUT = 12V - Auto Mode
LM6x645VOUT = 12V400kHz
Figure 8-69 LM6x645 Efficiency - VOUT = 12V - Auto Mode
LM65625 LM65635 LM65645 Start-Up - Auto
VIN = 24VVOUT = 5VIOUT =1mA2200kHz
Figure 8-71 Start-Up - Auto
LM65625 LM65635 LM65645 Output Short Circuit and Recovery - Auto
VIN = 24VVOUT = 5VIOUT = 0A2200kHz
Figure 8-73 Output Short Circuit and Recovery - Auto
LM65625 LM65635 LM65645 MODE Change Transient
VIN = 24VVOUT = 5VIOUT = 1mA2200kHz
Figure 8-75 MODE Change Transient
LM65625 LM65635 LM65645 LM6x625 Efficiency - Auto Mode
LM6x625VOUT = 3.3V400kHz
Figure 8-8 LM6x625 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6x635 Efficiency - Auto Mode
LM6x635VOUT = 3.3V 2200kHz
Figure 8-10 LM6x635 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Efficiency - Auto Mode
LM6x645VOUT = 3.3V400kHz
Figure 8-12 LM6x645 Efficiency - Auto Mode
LM65625 LM65635 LM65645 LM6xx25 Line and Load Regulation - Auto Mode
LM6xx25VOUT = 3.3V 400kHz
Figure 8-14 LM6xx25 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6xx25 Line and Load Regulation - Auto Mode
LM6xx25VOUT = 3.3V2200kHz
Figure 8-16 LM6xx25 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x635 Line and Load Regulation - Auto Mode
LM6x635VOUT = 3.3V400kHz
Figure 8-18 LM6x635 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x635 Line and Load Regulation - Auto Mode
LM6x635VOUT = 3.3V2200kHz
Figure 8-20 LM6x635 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Line and Load Regulation - Auto Mode
LM6x645VOUT = 3.3V400kHz
Figure 8-22 LM6x645 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Line and Load Regulation - Auto Mode
LM6x645VOUT = 3.3V2200kHz
Figure 8-24 LM6x645 Line and Load Regulation - Auto Mode
LM65625 LM65635 LM65645 LM6xx25 Efficiency - FPWM Mode
LM6xx25VOUT = 3.3V1000kHz
Figure 8-26 LM6xx25 Efficiency - FPWM Mode
LM65625 LM65635 LM65645 LM6xx25 Efficiency - FPWM Mode
LM6xx25VOUT = 5V1000kHz
Figure 8-28 LM6xx25 Efficiency - FPWM Mode
LM65625 LM65635 LM65645 LM6x635 Efficiency - FPWM Mode
LM6x635VOUT = 3.3V1000kHz
Figure 8-30 LM6x635 Efficiency - FPWM Mode
LM65625 LM65635 LM65645 LM6x635 Efficiency - FPWM Mode
LM6x635VOUT = 5V1000kHz
Figure 8-32 LM6x635 Efficiency - FPWM Mode
LM65625 LM65635 LM65645 LM6x645 Efficiency - FPWM Mode
LM6x645VOUT = 3.3V1000kHz
Figure 8-34 LM6x645 Efficiency - FPWM Mode
LM65625 LM65635 LM65645 LM6x645 Efficiency - FPWM Mode
LM6x645VOUT = 5V1000kHz
Figure 8-36 LM6x645 Efficiency - FPWM Mode
LM65625 LM65635 LM65645 LM6xx25 Line and Load Regulation - FPWM Mode
LM6xx25VOUT = 3.3V1000kHz
Figure 8-38 LM6xx25 Line and Load Regulation - FPWM Mode
LM65625 LM65635 LM65645 LM6xx25 Line and Load Regulation - FPWM Mode
LM6xx25VOUT = 5V1000kHz
Figure 8-40 LM6xx25 Line and Load Regulation - FPWM Mode
LM65625 LM65635 LM65645 LM6x635 Line and Load Regulation - FPWM Mode
LM6x635VOUT = 3.3V1000kHz
Figure 8-42 LM6x635 Line and Load Regulation - FPWM Mode
LM65625 LM65635 LM65645 LM6x635 Line and Load Regulation - FPWM Mode
LM6x635VOUT = 5V1000kHz
Figure 8-44 LM6x635 Line and Load Regulation - FPWM Mode
LM65625 LM65635 LM65645 LM6x645 Line and Load Regulation - FPWM Mode
LM6x645VOUT = 3.3V1000kHz
Figure 8-46 LM6x645 Line and Load Regulation - FPWM Mode
LM65625 LM65635 LM65645 LM6x645 Line and Load Regulation - FPWM Mode
LM6x645VOUT = 5V1000kHz
Figure 8-48 LM6x645 Line and Load Regulation - FPWM Mode
LM65625 LM65635 LM65645 LM6x635 Switching Frequency vs Load Current
LM6x635VIN = 24V2200kHzAuto
Figure 8-50 LM6x635 Switching Frequency vs Load Current
LM65625 LM65635 LM65645 LM6xx25 Switching Frequency vs Input Voltage
LM6xx25VOUT = 3.3V2200kHzFPWM
Figure 8-52 LM6xx25 Switching Frequency vs Input Voltage
LM65625 LM65635 LM65645 LM6x635 Switching Frequency vs Input Voltage
LM6x635VOUT = 3.3V2200kHzFPWM
Figure 8-54 LM6x635 Switching Frequency vs Input Voltage
LM65625 LM65635 LM65645 LM6x645 Dropout Characteristic
LM6x645VOUT = 5V400kHzFPWM
Figure 8-56 LM6x645 Dropout Characteristic
LM65625 LM65635 LM65645 LM6x645 Dropout Voltage
LM6x645FPWM400kHz
Figure 8-58 LM6x645 Dropout Voltage
LM65625 LM65635 LM65645 Input Supply Current - Auto Mode
LM6xx25VOUT = 3.3VL = 2.2μHVIN = 24V
Figure 8-60 Input Supply Current - Auto Mode
LM65625 LM65635 LM65645 Input Supply Current - Auto Mode
LM6x635VOUT = 3.3VL = 2.2μHVIN = 24V
Figure 8-62 Input Supply Current - Auto Mode
LM65625 LM65635 LM65645 Input Supply Current - Auto Mode
LM6x645VOUT = 3.3VL = 8.2μHVIN = 24V
Figure 8-64 Input Supply Current - Auto Mode
LM65625 LM65635 LM65645 No Load Input Supply Current - Auto Mode
LM6xx25IOUT = 0AL = 2.2μH
Figure 8-66 No Load Input Supply Current - Auto Mode
LM65625 LM65635 LM65645 No Load Input Supply Current - Auto Mode
LM6x645IOUT = 0AL = 8.2μH
Figure 8-68 No Load Input Supply Current - Auto Mode
LM65625 LM65635 LM65645 LM6x645 Line and Load Regulation - VOUT = 12V - Auto Mode
LM6x45VOUT = 12V400kHz
Figure 8-70 LM6x645 Line and Load Regulation - VOUT = 12V - Auto Mode
LM65625 LM65635 LM65645 Start-Up, Shutdown - FPWM
VIN = 24VVOUT = 5VIOUT = 3.5A2200kHz
Figure 8-72 Start-Up, Shutdown - FPWM
LM65625 LM65635 LM65645 Current Limit Transient
VIN = 24VVOUT = 5VAuto2200kHz
Figure 8-74 Current Limit Transient
LM65625 LM65635 LM65645 Dropout Transient and Recovery
VIN = 24VVOUT = 5VIOUT = 1A2200kHz
Figure 8-76 Dropout Transient and Recovery
Table 8-6 BOM for Application Curve Data
DEVICEOUTPUT VOLTAGESWITCHING FREQUENCYINDUCTORINDUCTOR D.C.R.COUT AT VOUT (FOR TRANSIENT TESTS)
LM6x6255V400kHz10μH0.03Ω
LM6x6255V2200kHz2.2μH0.02Ω
LM6x6253.3V400kHz10μH0.03Ω
LM6x6253.3V2200kHz2.2μH0.02Ω
LM6x6355V400kHz8.2μH0.016Ω
LM6x6355V2200kHz2.2μH0.018Ω 23μF
LM6x6353.3V400kHz8.2μH0.016Ω
LM6x6353.3V2200kHz2.2μH0.018Ω 27μF
LM6x6455V400kHz8.2μH0.016Ω 91μF
LM6x6455V2200kHz2.2μH0.018Ω
LM6x6453.3V400kHz8.2μH0.016Ω 120μF
LM6x6453.3V2200kHz2.2μH0.018Ω
LM6x6455V1000kHz3.3μH0.012Ω
LM6x6453.3V1000kHz3.3μH0.012Ω
LM6x6355V1000kHz4.7μH0.014Ω
LM6x6353.3V1000kHz4.7μH0.014Ω
LM6x255V1000kHz6.8μH0.021Ω
LM6x6253.3V1000kHz6.8μH0.021Ω
LM6x64512V400kHz15μH0.043Ω
LM65625 LM65635 LM65645 EMI Input Filter for 2200kHzFigure 8-77 EMI Input Filter for 2200kHz
LM65625 LM65635 LM65645 EMI Input Filter for 400kHzFigure 8-78 EMI Input Filter for 400kHz

The data in the following table applies 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 specified by production testing.

Table 8-7 Typical System Specifications
PARAMETRS TEST CONDITIONSMINTYPMAXUNITS
IsupplyInput supply currentVin = 24V, Vout = 3.3V, Iout = 0A, LM6x635, 2.2MHz2.4μA
VoutVout = 5VVin = 7V to 65V, Iout = 0A to full load, FPWM–1.5%+1.5%
Vout = 5VVin = 7V to 65V, Iout = 0A to full load, AUTO–1.5%+2.5%
VoutVout = 3.3VVin = 5V to 65V, Iout = 0A to full load, FPWM–1.5%+1.5%
Vout = 3.3VVin = 5V to 65V, Iout = 0A to full load, AUTO–1.5%+2.5%
η Peak efficiency Vin = 12V, Vout = 5V, Iout = 1.5A, LM6x645, 400kHz95%
Vin = 24V, Vout = 5V, Iout = 1.5A, LM6x645, 400kHz93.6%