ZHCSO86B december   2022  – july 2023 LM74900-Q1 , LM74910-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 开关特性
    7. 7.7 Typical Characteristics
  9. 8 Parameter Measurement Information
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Charge Pump
      2. 9.3.2 Dual Gate Control (DGATE, HGATE)
        1. 9.3.2.1 Reverse Battery Protection (A, C, DGATE)
        2. 9.3.2.2 Load Disconnect Switch Control (HGATE, OUT)
      3. 9.3.3 Overcurrent Protection (CS+, CS-, ILIM, IMON, TMR)
        1. 9.3.3.1 Pulse Overload Protection, Circuit Breaker
        2. 9.3.3.2 Overcurrent Protection With Latch-Off
        3. 9.3.3.3 Short Circuit Protection (ISCP)
        4. 9.3.3.4 Analog Current Monitor Output (IMON)
      4. 9.3.4 Undervoltage Protection, Overvoltage Protection, and Battery Voltage Sensing (UVLO, OV, SW)
      5. 9.3.5 Low IQ SLEEP Mode (SLEEP)
      6. 9.3.6 Ultra Low IQ Shutdown (EN)
  11. 10Applications and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical 12-V Reverse Battery Protection Application
      1. 10.2.1 Design Requirements for 12-V Battery Protection
      2. 10.2.2 Automotive Reverse Battery Protection
        1. 10.2.2.1 Input Transient Protection: ISO 7637-2 Pulse 1
        2. 10.2.2.2 AC Super Imposed Input Rectification: ISO 16750-2 and LV124 E-06
        3. 10.2.2.3 Input Micro-Short Protection: LV124 E-10
      3. 10.2.3 Detailed Design Procedure
        1. 10.2.3.1 Design Considerations
        2. 10.2.3.2 Charge Pump Capacitance VCAP
        3. 10.2.3.3 Input and Output Capacitance
        4. 10.2.3.4 Hold-Up Capacitance
        5. 10.2.3.5 Selection of Current Sense Resistor, RSNS
        6. 10.2.3.6 Selection of Scaling Resistor (RSET) and Short-Circuit Protection Setting Resistor (RSCP)
        7. 10.2.3.7 Overcurrent Limit (ILIM), Circuit Breaker Timer (TMR), and Current Monitoring Output (IMON) Selection
        8. 10.2.3.8 Overvoltage Protection and Battery Monitor
      4. 10.2.4 MOSFET Selection: Blocking MOSFET Q1
      5. 10.2.5 MOSFET Selection: Hot-Swap MOSFET Q2
      6. 10.2.6 TVS Selection
      7. 10.2.7 Application Curves
    3. 10.3 Addressing Automotive Input Reverse Battery Protection Topologies With LM749x0-Q1
    4. 10.4 Power Supply Recommendations
      1. 10.4.1 Transient Protection
      2. 10.4.2 TVS Selection for 12-V Battery Systems
    5. 10.5 Layout
      1. 10.5.1 Layout Guidelines
  12. 11Device and Documentation Support
    1. 11.1 接收文档更新通知
    2. 11.2 支持资源
    3. 11.3 Trademarks
    4. 11.4 静电放电警告
    5. 11.5 术语表
  13. 12Mechanical, Packaging, and Orderable Information

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9.3.5 Low IQ SLEEP Mode (SLEEP)

LM749x0-Q1 supports low IQ SLEEP mode operation. This mode can be enabled by pulling SLEEP pin low (EN = High). In SLEEP mode, device turns off internal charge pump, SW switch and disables DGATE and HGATE drive thus achieving low current consumption of 6-μA typical. However at the same time device power up always on loads connected on OUT pin through an internal low power MOSFET with typical on resistance of 7 Ω. In this mode device can support peak load current of 100 mA. As load is increased, voltage drop across internal MOSFET increases. Device offers overcurrent protection during sleep mode with typical overcurrent threshold of 250 mA. In case of overcurrent event during sleep mode, device protects internal FET by disconnecting the internal MOSFET switch and latching off the device. As an additional layer of protection, device also features thermal shutdown with latch off feature in SLEEP mode in case of any overheating of the device in SLEEP mode. To put the device out of the latch mode user has to toggle the SLEEP or EN pin.

In SLEEP mode LM749x0-Q1 offers protection against input overvoltage events. Device can be configured in either overvoltage cut-off (SLEEP_OV connected to C) or overvoltage clamp mode (SLEEP_OV connected to VOUT) with default overvoltage threshold of 21-V typical.

If SLEEP mode feature is not required then SLEEP pin should be tied to EN. When not used SLEEP_OV pin can be left floating.

GUID-20230608-SS0I-0VB7-HRS7-HNPMNN41SVZX-low.svgFigure 9-10 LM749x0-Q1 SLEEP Mode Operation

A higher overvoltage threshold for SLEEP mode can be achieved by adding an external Zener diode between SLEEP_OV pin to OUT/C as shown in Figure 9-11. This feature is useful while configuring overvoltage threshold for 24-V or 48-V powered systems.

GUID-20210924-SS0I-WHDQ-B72G-XHKGNTNNM9M7-low.svg Figure 9-11 Increasing SLEEP_OV Threshold Using an External Zener Diode