JAJSBJ7H June   2009  – September 2016 LM5009A

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 改訂履歴
  5. 5 Pin Configuration and 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
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Control Circuit Overview
      2. 7.3.2 Start-Up Regulator (VCC)
      3. 7.3.3 Regulation Comparator
      4. 7.3.4 Overvoltage Comparator
      5. 7.3.5 ON-Time Generator and Shutdown
      6. 7.3.6 Current Limit
      7. 7.3.7 N-Channel Buck Switch and Driver
      8. 7.3.8 Thermal Protection
    4. 7.4 Device Functional Modes
  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  RFB1 and RFB2
        2. 8.2.2.2  Fs and RT
        3. 8.2.2.3  L1
          1. 8.2.2.3.1 Minimum Load Current
          2. 8.2.2.3.2 Maximum Load Current
        4. 8.2.2.4  C3
        5. 8.2.2.5  C2 and R3
        6. 8.2.2.6  ESR and R3
        7. 8.2.2.7  C2
        8. 8.2.2.8  RCL
        9. 8.2.2.9  D1
        10. 8.2.2.10 C1
        11. 8.2.2.11 C4
        12. 8.2.2.12 C5
        13. 8.2.2.13 Ripple Configuration
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 ドキュメントのサポート
      1. 11.1.1 関連資料
    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

5 Pin Configuration and Functions

DGK Package
8-Pin VSSOP
Top View
NGU Package
8-Pin WSON
Top View

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
SW 1 O Switching node: power switching node. Connect to the output inductor, recirculating diode, and bootstrap capacitor.
BST 2 I Boost pin (bootstrap capacitor input): an external capacitor is required between the BST and the SW pins. A 0.01-µF ceramic capacitor is recommended. An internal diode charges the capacitor from VCC during each OFF time.
RCL 3 I Current limit OFF-time set pin: a resistor between this pin and RTN sets the OFF time when current limit is detected. The OFF time is preset to 35 µs if FB = 0 V.
RTN 4 — Ground pin: ground for the entire circuit.
FB 5 I Feedback input from regulated output: this pin is connected to the inverting input of the internal regulation comparator. The regulation threshold is 2.5 V.
RT/SD 6 I On time set pin: a resistor between this pin and VIN sets the switch on time as a function of VIN. The minimum recommended on time is 400 ns at the maximum input voltage. This pin is used for remote shutdown.
VCC 7 O Output from the internal high voltage series pass regulator: this regulated voltage provides gate drive power for the internal Buck switch. An internal diode is provided between this pin and the BST pin. A local 0.47-µF decoupling capacitor is required. The series pass regulator is current limited to 9 mA.
VIN 8 I Input voltage: input operating range of 6 V to 95 V.
EP — — Exposed pad: the exposed pad has no electrical contact. Connect to system ground plane for reduced thermal resistance.