JAJSTJ2 June   2024 DRV2911-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings Auto
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Output Stage
      2. 6.3.2 Hardware Interface
      3. 6.3.3 AVDD Linear Voltage Regulator
      4. 6.3.4 Step-Down Mixed-Mode Buck Regulator
        1. 6.3.4.1 Buck in Inductor Mode
        2. 6.3.4.2 Buck in Resistor mode
        3. 6.3.4.3 Buck Regulator with External LDO
        4. 6.3.4.4 AVDD Power Sequencing with Buck Regulator
        5. 6.3.4.5 Mixed mode Buck Operation and Control
        6. 6.3.4.6 Buck Undervoltage Lockout
        7. 6.3.4.7 Buck Overcurrent Protection
      5. 6.3.5 Charge Pump
      6. 6.3.6 Slew Rate Control
      7. 6.3.7 Cross Conduction (Dead Time)
      8. 6.3.8 Propagation Delay
      9. 6.3.9 Protections
        1. 6.3.9.1 PVDD Supply Undervoltage Lockout
        2. 6.3.9.2 AVDD Undervoltage Lockout
        3. 6.3.9.3 VCP Charge Pump Undervoltage Lockout
        4. 6.3.9.4 Overcurrent Latched Protection
        5. 6.3.9.5 Thermal Shutdown (OTSD)
          1. 6.3.9.5.1 OTSD FET
          2. 6.3.9.5.2 OTSD (Non-FET)
    4. 6.4 Device Functional Modes
      1. 6.4.1 Functional Modes
        1. 6.4.1.1 Reset Mode
        2. 6.4.1.2 Operating Mode
        3. 6.4.1.3 Fault Reset (RESETZ Pulse)
      2. 6.4.2 OUTOFF functionality
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Design Procedure
      2. 7.2.2 Voltage and Current Sense Circuitry
  9. 8 Power Supply Recommendations
    1. 8.1 Bulk Capacitance
  10. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
    3. 9.3 Thermal Considerations
      1. 9.3.1 Power Dissipation
  11. 10Device and Documentation Support
    1. 10.1 サード・パーティ製品に関する免責事項
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 ドキュメントの更新通知を受け取る方法
    4. 10.4 サポート・リソース
    5. 10.5 Trademarks
    6. 10.6 静電気放電に関する注意事項
    7. 10.7 用語集
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

6.3.4.2 Buck in Resistor mode

If the external load requirements is less than 40mA, the inductor can be replaced with a resistor. In resistor mode, the power is dissipated across the external resistor and the efficiency is lower than a buck in inductor mode. To appropriately scale the resistor, use the following equations. The ULC1001-Q1 max current consumption is approximately 10mA, IULC. Using DRV2911-Q1 internal current, IDRV_INT, consumption assumed to be 10mA, PVDD equal to 25V, and buck voltage equal to 5V, the buck resistor should be rated higher than 400mW. When choosing a resistor rating, consider the layout's ambient temperature range and overall thermal dissipation.

Equation 3. PSTANDBY=VPVDD ✕ (IULC+IDRV_INT)
Equation 4. PBK_RES=PSTANDBY-(VBUCK ✕ IULC+DRV_INT)

Figure 6-8 shows the connection of buck regulator in resistor mode.

DRV2911-Q1 Buck (Resistor Mode)Figure 6-8 Buck (Resistor Mode)