JAJSRP9 September   2024

ADVANCE INFORMATION  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 説明
  5. 4 Device Options
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Rating
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 I2C Interface Timing 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 Pulse Frequency Modulation (PFM)
      2. 7.3.2 Forced PWM Mode
      3. 7.3.3 Low Dropout Operation (100% Duty Cycle)
      4. 7.3.4 Soft Start
      5. 7.3.5 Switch Current Limit and HICCUP Short-Circuit Protection
      6. 7.3.6 Undervoltage Lockout
      7. 7.3.7 Thermal Warning and Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Enable and Disable (EN)
      2. 7.4.2 Output Discharge
      3. 7.4.3 Power Good (PG)
      4. 7.4.4 Voltage Setting and Mode Selection (VSET/MODE)
    5. 7.5 Programming
      1. 7.5.1 Serial Interface Description
      2. 7.5.2 Standard-, Fast-, and Fast-Mode Plus Protocol
      3. 7.5.3 HS Mode Protocol
      4. 7.5.4 I2C Update Sequence
      5. 7.5.5 I2C Register Reset
  9. 8 Register Map
    1. 8.1 Target Address Byte
    2. 8.2 Register Address Byte
    3. 8.3 VOUT Register 1
    4. 8.4 VOUT Register 2
    5. 8.5 CONTROL Register
    6. 8.6 STATUS Register
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Setting The Output Voltage
        3. 9.2.2.3 Output Filter Design
        4. 9.2.2.4 Inductor Selection
        5. 9.2.2.5 Capacitor Selection
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
        1. 9.4.2.1 Thermal Considerations
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 サード・パーティ製品に関する免責事項
      2. 10.1.2 Development Support
        1. 10.1.2.1 Custom Design With WEBENCH® Tools
    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

5 Pin Configuration and Functions

Figure 5-1 13-Pin VBM VQFN-HR Package for FB Version (Top View)
Figure 5-2 13-Pin VBM VQFN-HR Package for FB Version (Bottom View)
Table 5-1 Pin Functions
PIN TYPE(1) DESCRIPTION
NAME NO.
EN 5 I Device enable pin. To enable the device, this pin must be pulled high. Pulling this pin low disables the device. Do not leave floating.
FB 3 FB Voltage feedback input. Connect the output voltage resistor divider to this pin. When using a fixed output voltage, connect directly to OUT.
GND 10,11,12 GND Power ground pin
OUT 2 I Output voltage sense pin. This pin must be directly connected to the output capacitor.
PG 7 O Power-good open-drain output pin. The pullup resistor can be connected to voltages up to 5.5V. If unused, leave this pin floating. This pin is pulled to GND when the device is in shutdown.
SS 4 I Soft-start pin. An external capacitor can adjust the soft-start time. If unused, leave this pin floating.
SW 1, 9 P Switch pin of the power stage
VIN 8,13 P Power supply input voltage pin
VSET/MODE 6 I Connecting a resistor to GND selects one of the fixed output voltages. Tying the pin high or low selects an adjustable output voltage. After the device has started up, the pin operates as a MODE input. Applying a high level selects forced PWM mode operation and a low level selects power save mode operation.
(1) I = input, O = output, P = power, GND = ground
Figure 5-3 13-Pin VBM VQFN-HR Package for I2C Version (Top View)
Figure 5-4 13-Pin VBM VQFN-HR Package for I2C Version (Bottom View)
Table 5-2 Pin Functions
PIN TYPE(1) DESCRIPTION
NAME NO.
EN 5 I Device enable pin. To enable the device, this pin must be pulled high. Pulling this pin low disables the device. Do not leave floating.
GND 10,11,12 GND Power ground pin
OUT 2 I Output voltage sense pin. This pin must be directly connected to the output capacitor.
PG 3 O Power-good open-drain output pin. The pullup resistor can be connected to voltages up to 5.5V. If unused, leave this pin floating. This pin is pulled to GND when the device is in shutdown.
SCL 6 I I2C serial clock pin. Do not leave this pin floating. Connect this pin to AGND if not used.
SDA 7 I/O I2C serial data pin. Do not leave this pin floating. Connect this pin to AGND if not used.
SS 4 I Soft-start pin. An external capacitor can adjust the soft-start time. If unused, leave this pin floating.
SW 1, 9 P Switch pin of the power stage
VIN 8,13 P Power supply input voltage pin
(1) I = input, O = output, P = power, GND = ground