JAJSDP3C March   2016  – June 2018 LMZ34202

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
      2.      効率と出力電流との関係
  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 Switching Characteristics
    7. 6.7 Typical Characteristics
    8. 6.8 Typical Characteristics (Thermal Derating)
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Adjusting the Output Voltage
      2. 7.3.2  Switching Frequency (RT)
      3. 7.3.3  Recommended Operating Range
      4. 7.3.4  Synchronization (CLK)
      5. 7.3.5  Output Capacitor Selection
      6. 7.3.6  VERSA-COMP Pin Configurations
      7. 7.3.7  Input Capacitor Selection
      8. 7.3.8  Output On/Off Inhibit (INH/UVLO)
      9. 7.3.9  Under Voltage Lockout (UVLO)
      10. 7.3.10 Remote Sense
      11. 7.3.11 VBSEL
      12. 7.3.12 Soft-Start (SS/TR)
      13. 7.3.13 Power Good (PWRGD) and Pull-up (PWRGD_PU)
      14. 7.3.14 Overcurrent Protection
      15. 7.3.15 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Active Mode
      2. 7.4.2 Light Load Operation
      3. 7.4.3 Shutdown Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Minimum External Component Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2 Output Voltage Set-Point
          3. 8.2.1.2.3 RT and RTSEL
          4. 8.2.1.2.4 VERSA-COMP
          5. 8.2.1.2.5 VBSEL
          6. 8.2.1.2.6 Input Capacitors
          7. 8.2.1.2.7 Output Capacitors
        3. 8.2.1.3 Application Curves
      2. 8.2.2 INH Control Application
        1. 8.2.2.1 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Switching Frequency
        2. 8.2.3.2 Power Good
        3. 8.2.3.3 Inhibit Control
        4. 8.2.3.4 VERSA-COMP
        5. 8.2.3.5 VBSEL
        6. 8.2.3.6 Soft-Start Capacitors
        7. 8.2.3.7 Input Capacitors
        8. 8.2.3.8 Output Capacitors
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 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 ドキュメントの更新通知を受け取る方法
    3. 11.3 コミュニティ・リソース
    4. 11.4 商標
    5. 11.5 静電気放電に関する注意事項
    6. 11.6 Glossary
  12. 12メカニカル、パッケージ、および注文情報

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

7.3.1 Adjusting the Output Voltage

The VADJ pin sets the output voltage of the LMZ34202. The output voltage adjustment range is from 2.5 V to 7.5 V. The switching frequency range for any output voltage must be determined from Table 4 or Table 5. The adjustment method requires the addition of RSET, which sets the output voltage, and the connection of SENSE+ to VOUT. The RSET resistor must be connected directly between the VADJ (pin 24) and AGND. The SENSE+ pin (pin 22) must be connected to VOUT either at the load for improved regulation or at VOUT of the device. Table 1 lists the standard external RSET resistor for a number of common bus voltages.

Table 1. Standard RSET Resistor Values for Common Output Voltages

OUTPUT VOLTAGE VOUT (V)
2.5 3.3 5.0 6.0 7.5
RSET (kΩ) 13.7 8.87 5.11 4.02 3.09

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. LMZ34202 Rset_Equation.gif

Table 2. Standard RSET Resistor Values

VOUT (V) RSET (kΩ) VOUT (V) RSET (kΩ)
2.5 13.7 5.1 4.99
2.6 12.7 5.2 4.87
2.7 11.8 5.3 4.75
2.8 11.3 5.4 4.64
2.9 10.7 5.5 4.53
3.0 10.2 5.6 4.42
3.1 9.76 5.7 4.32
3.2 9.31 5.8 4.22
3.3 8.87 5.9 4.12
3.4 8.45 6.0 4.02
3.5 8.06 6.1 3.97
3.6 7.87 6.2 3.92
3.7 7.50 6.3 3.83
3.8 7.32 6.4 3.74
3.9 6.98 6.5 3.65
4.0 6.81 6.6 3.61
4.1 6.49 6.7 3.57
4.2 6.34 6.8 3.48
4.3 6.19 6.9 3.40
4.4 5.90 7.0 3.36
4.5 5.76 7.1 3.32
4.6 5.62 7.2 3.24
4.7 5.49 7.3 3.20
4.8 5.36 7.4 3.16
4.9 5.23 7.5 3.09
5.0 5.11