JAJSPY6 December   2023 LMR66410 , LMR66420 , LMR66430

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  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 System Characteristics
    7. 6.7 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  Enable, Start-Up, and Shutdown
      2. 7.3.2  External CLK SYNC (With MODE/SYNC)
        1. 7.3.2.1 Pulse-Dependent MODE/SYNC Pin Control
      3. 7.3.3  Adjustable Switching Frequency (with RT)
      4. 7.3.4  Power-Good Output Operation
      5. 7.3.5  Internal LDO, VCC, and VOUT/FB Input
      6. 7.3.6  Bootstrap Voltage and VBOOT-UVLO (BOOT Terminal)
      7. 7.3.7  Output Voltage Selection
      8. 7.3.8  Spread Spectrum
      9. 7.3.9  Soft Start and Recovery from Dropout
        1. 7.3.9.1 Recovery from Dropout
      10. 7.3.10 Current Limit and Short Circuit
      11. 7.3.11 Thermal Shutdown
      12. 7.3.12 Input Supply Current
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Standby Mode
      3. 7.4.3 Active Mode
        1. 7.4.3.1 CCM Mode
        2. 7.4.3.2 Auto Mode – Light Load Operation
          1. 7.4.3.2.1 Diode Emulation
          2. 7.4.3.2.2 Frequency Reduction
        3. 7.4.3.3 FPWM Mode – Light Load Operation
        4. 7.4.3.4 Minimum On-Time (High Input Voltage) Operation
        5. 7.4.3.5 Dropout
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Synchronous Buck Regulator at 400 kHz
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1  Choosing the Switching Frequency
        2. 8.2.3.2  Setting the Output Voltage
          1. 8.2.3.2.1 VOUT / FB for Adjustable Output
        3. 8.2.3.3  Inductor Selection
        4. 8.2.3.4  Output Capacitor Selection
        5. 8.2.3.5  Input Capacitor Selection
        6. 8.2.3.6  CBOOT
        7. 8.2.3.7  VCC
        8. 8.2.3.8  CFF Selection
        9. 8.2.3.9  External UVLO
        10. 8.2.3.10 Maximum Ambient Temperature
      4. 8.2.4 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 サード・パーティ製品に関する免責事項
      2. 9.1.2 Device Nomenclature
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 ドキュメントの更新通知を受け取る方法
    4. 9.4 サポート・リソース
    5. 9.5 Trademarks
    6. 9.6 静電気放電に関する注意事項
    7. 9.7 用語集
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable 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

5 Pin Configuration and Functions

GUID-20231023-SS0I-FPFC-RQQ3-PVLMCDVT4XNP-low.svg
A. See Device Comparison Table for more details. Pin 13 is factory-set for externally adjustable switching frequency RT variants only.
B. Pin 13 is factory-set for fixed switching frequency MODE/SYNC variants only.
Figure 5-1 RXB 14-Pin (2.6 mm × 2.6 mm) Enhanced HotRod™ VQFN-FCRLF Package (Top View)
Table 5-1 Pin Functions
PIN TYPE DESCRIPTION
NAME NO.
EN/UVLO 1 A Enable input to regulator. High = ON, low = OFF. Can be connected directly to VIN. Do not float this pin.
NC 2 — No internal connection to device
VIN 3 P Input supply to regulator. High-quality bypass capacitors must be added directly between this pin and PGND.
NC 4 — No internal connection to device
NC 5 — No internal connection to device
PGND 6 G Power ground terminal. Connect to system ground. Connect to CIN with short, wide traces.
SW 7 P Regulator switch node. Connect to the power inductor.
BOOT 8 P Bootstrap supply voltage for internal high-side driver. An external 0.1-µF, 16-V capacitor is required between this pin and SW.
NC 9 — No internal connection to device
VCC 10 A Internal LDO output. Used as supply to internal control circuits. Do not connect to external loads. Can be used as logic supply for power-good flag. Connect a high-quality 1-µF capacitor from this pin to GND.
VOUT/FB 11 A Fixed output options and adjustable output options are available with the VOUT/FB pin variant. Connect to the output voltage node for fixed VOUT. See VOUT / FB for Adjustable Output for how to select feedback resistor divider values. See Device Comparison Table for more details. The FB function can be used to adjust the output voltage. Connect to tap point of feedback voltage divider. Do not float this pin.
NC 12 — No internal connection to device
RT or MODE/SYNC 13 A For the RT variant, the switching frequency can be adjusted from 200 kHz to 2.2 MHz.
For the MODE/SYNC variant, the device can operate in user-selectable PFM/FPWM mode and can be synchronized to an external clock.Do not float this pin.
PG 14 A Open-drain power-good flag output. Connect to suitable voltage supply through a current limiting resistor. High = power OK, low = power bad. This pin goes low when EN = low. This pin can be open or grounded when not used.
GND/DAP — G Thermal pad of the package. Must be soldered to achieve appropriate dissipation. Must be connected to GND.
A = Analog, P = Power, G = Ground