JAJSBZ7E JULY   2013  – December 2019 LMZ31710

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      アプリケーション概略図
  4. 4 改訂履歴
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 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 (PVIN = VIN = 12 V)
    7. 6.7 Typical Characteristics (PVIN = VIN = 5 V)
    8. 6.8 Typical Characteristics (PVIN = 3.3 V, VIN = 5 V)
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  VIN and PVIN Input Voltage
      2. 7.3.2  3.3-V PVIN Operation
      3. 7.3.3  Adjusting the Output Voltage (0.6 V to 5.5 V)
      4. 7.3.4  Capacitor Recommendations For the LMZ31710 Power Supply
        1. 7.3.4.1 Capacitor Technologies
          1. 7.3.4.1.1 Electrolytic, Polymer-Electrolytic Capacitors
          2. 7.3.4.1.2 Ceramic Capacitors
          3. 7.3.4.1.3 Tantalum, Polymer-Tantalum Capacitors
        2. 7.3.4.2 Input Capacitor
        3. 7.3.4.3 Output Capacitor
      5. 7.3.5  Transient Response
        1. 7.3.5.1 Transient Response Waveforms
      6. 7.3.6  Power Good (PWRGD)
      7. 7.3.7  Light Load Efficiency (LLE)
      8. 7.3.8  SYNC_OUT
      9. 7.3.9  Parallel Operation
      10. 7.3.10 Power-Up Characteristics
      11. 7.3.11 Pre-Biased Start-Up
      12. 7.3.12 Remote Sense
      13. 7.3.13 Thermal Shutdown
      14. 7.3.14 Output On/Off Inhibit (INH)
      15. 7.3.15 Slow Start (SS/TR)
      16. 7.3.16 Overcurrent Protection
      17. 7.3.17 Synchronization (CLK)
      18. 7.3.18 Sequencing (SS/TR)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Programmable Undervoltage Lockout (UVLO)
  8. 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 Setting The Output Voltage
        3. 8.2.2.3 Setting the Switching Frequency
        4. 8.2.2.4 Input Capacitance
        5. 8.2.2.5 Output Capacitance
    3. 8.3 Additional Application Schematics
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Considerations
    2. 10.2 Layout Examples
      1. 10.2.1 EMI
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 デバイス・サポート
      1. 11.1.1 開発サポート
        1. 11.1.1.1 WEBENCH®ツールによるカスタム設計
      2. 11.1.2 デベロッパー・ネットワークの製品に関する免責事項
    2. 11.2 ドキュメントのサポート
      1. 11.2.1 関連資料
    3. 11.3 ドキュメントの更新通知を受け取る方法
    4. 11.4 サポート・リソース
    5. 11.5 商標
    6. 11.6 静電気放電に関する注意事項
    7. 11.7 Glossary
  12. 12メカニカル、パッケージ、および注文情報
    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

7.3.3 Adjusting the Output Voltage (0.6 V to 5.5 V)

The VADJ control sets the output voltage of the LMZ31710. The output voltage adjustment range of the LMZ31710 is from 0.6 V to 5.5 V. The adjustment method requires the addition of RSET, which sets the output voltage, the connection of SENSE+ to VOUT, and in some cases RRT which sets the switching frequency. The RSET resistor must be connected directly between the VADJ (pin 26) and AGND (pin 23). The SENSE+ pin (pin 27) must be connected to VOUT either at the load for improved regulation or at VOUT of the device. The RRT resistor must be connected directly between the RT/CLK (pin 22) and AGND (pin 23). Table 1 gives the standard external RSET resistor for a number of common bus voltages, along with the recommended RRT resistor for that output voltage.

Table 1. Standard RSET Resistor Values for Common Output Voltages

RESISTORS OUTPUT VOLTAGE VOUT (V)
0.9 1.0 1.2 1.8 2.5 3.3 5.0
RSET (kΩ) 2.87 2.15 1.43 0.715 0.453 0.316 0.196
RRT (kΩ) 1000 1000 487 169 90.9 90.9 63.4

For other output voltages, the value of the required resistor can either be calculated using the following formula, or simply selected from the range of values given in Table 2.

Equation 1. LMZ31710 Rset.gif

Table 2. Standard RSET Resistor Values

VOUT (V) RSET (kΩ) RRT(kΩ) fSW(kHz) VOUT (V) RSET (kΩ) RRT(kΩ) fSW(kHz)
0.6 open OPEN 200 3.1 0.348 90.9 750
0.7 8.66 OPEN 200 3.2 0.332 90.9 750
0.8 4.32 OPEN 200 3.3 0.316 90.9 750
0.9 2.87 1000 250 3.4 0.309 90.9 750
1.0 2.15 1000 250 3.5 0.294 90.9 750
1.1 1.74 1000 250 3.6 0.287 90.9 750
1.2 1.43 487 300 3.7 0.280 90.9 750
1.3 1.24 487 300 3.8 0.267 90.9 750
1.4 1.07 487 300 3.9 0.261 90.9 750
1.5 0.953 487 300 4.0 0.255 90.9 750
1.6 0.866 487 300 4.1 0.243 63.4 1000
1.7 0.787 487 300 4.2 0.237 63.4 1000
1.8 0.715 169 500 4.3 0.232 63.4 1000
1.9 0.665 169 500 4.4 0.226 63.4 1000
2.0 0.619 169 500 4.5 0.221 63.4 1000
2.1 0.576 169 500 4.6 0.215 63.4 1000
2.2 0.536 169 500 4.7 0.210 63.4 1000
2.3 0.511 169 500 4.8 0.205 63.4 1000
2.4 0.475 169 500 4.9 0.200 63.4 1000
2.5 0.453 90.9 750 5.0 0.196 63.4 1000
2.6 0.432 90.9 750 5.1 0.191 63.4 1000
2.7 0.412 90.9 750 5.2 0.187 63.4 1000
2.8 0.392 90.9 750 5.3 0.182 63.4 1000
2.9 0.374 90.9 750 5.4 0.178 63.4 1000
3.0 0.357 90.9 750 5.5 0.174 63.4 1000