JAJSB30I August   2010  – April 2018 LM25119

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      代表的なアプリケーション回路
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Switching Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  High Voltage Start-Up Regulator
      2. 8.3.2  UVLO
      3. 8.3.3  Enable 2
      4. 8.3.4  Oscillator and Sync Capability
      5. 8.3.5  Error Amplifiers and PWM Comparators
      6. 8.3.6  Ramp Generator
      7. 8.3.7  Current Limit
      8. 8.3.8  Hiccup Mode Current Limiting
      9. 8.3.9  Soft Start
      10. 8.3.10 HO and LO Output Drivers
      11. 8.3.11 Maximum Duty Cycle
      12. 8.3.12 Thermal Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Diode Emulation
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Miscellaneous Functions
      2. 9.1.2 Interleaved Two-Phase Operation
      3. 9.1.3 Interleaved 4-Phase Operation
    2. 9.2 Typical Applications
      1. 9.2.1 Dual-output Design Example
        1. 9.2.1.1 Design Requirements
          1. 9.2.1.1.1 External Components
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1  Timing Resistor
          2. 9.2.1.2.2  Output Inductor
          3. 9.2.1.2.3  Current Sense Resistor
          4. 9.2.1.2.4  Ramp Resistor and Ramp Capacitor
          5. 9.2.1.2.5  Output Capacitors
          6. 9.2.1.2.6  Input Capacitors
          7. 9.2.1.2.7  VCC Capacitor
          8. 9.2.1.2.8  Bootstrap Capacitor
          9. 9.2.1.2.9  Soft Start Capacitor
          10. 9.2.1.2.10 Restart Capacitor
          11. 9.2.1.2.11 Output Voltage Divider
          12. 9.2.1.2.12 UVLO Divider
          13. 9.2.1.2.13 MOSFET Selection
          14. 9.2.1.2.14 MOSFET Snubber
          15. 9.2.1.2.15 Error Amplifier Compensation
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Two-Phase Design Example
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Switching Jitter Root Causes and Solutions
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 コミュニティ・リソース
    2. 12.2 商標
    3. 12.3 静電気放電に関する注意事項
    4. 12.4 Glossary
  13. 13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

8.1 Overview

The LM25119 high voltage switching regulator features all of the functions necessary to implement an efficient dual-channel buck regulator that operates over a very wide input voltage range. The LM25119 may be configured as two independent regulators or as a single high-current regulator with two interleaved channels. This easy-to-use regulator integrates high-side and low-side MOSFET drivers capable of supplying peak currents of 2.5 A (VCC = 8 V). The regulator control method is based on current mode control using an emulated current ramp. Emulated peak current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable processing of the very small duty cycles necessary in high input voltage applications. The switching frequency is user programmable from 50 kHz to 750 kHz. An oscillator or synchronization pin allows the operating frequency to be set by a single resistor or synchronized to an external clock. An undervoltage lockout and channel2 enable pin allows either both regulators to be disabled or channel2 to be disabled with full operation of channel1. Fault protection features include current limiting, thermal shutdown and remote shutdown capability. The undervoltage lockout input enables both channels when the input voltage reaches a user selected threshold and provides a very low quiescent shutdown current when pulled low. The
32-pin WQFN package features an exposed pad to aid in thermal dissipation.