ZHCSIW9I April   2004  – October 2018 LM5008

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      典型应用电路和方框图
  4. 4 修订历史记录
  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
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Hysteretic Control Circuit Overview
      2. 7.3.2 High Voltage Start-Up Regulator
      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
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Minimum Load Current
    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
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 第三方米6体育平台手机版_好二三四免责声明
      2. 11.1.2 使用 WEBENCH® 工具创建定制设计方案
      3. 11.1.3 开发支持
    2. 11.2 文档支持
      1. 11.2.1 相关文档
        1. 11.2.1.1 PCB 布局资源
        2. 11.2.1.2 热设计资源
    3. 11.3 接收文档更新通知
    4. 11.4 社区资源
    5. 11.5 商标
    6. 11.6 静电放电警告
    7. 11.7 术语表
  12. 12机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

5 Pin Configuration and Functions

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

Pin Functions

PIN TYPE DESCRIPTION
NO. NAME
1 SW P Switching node: power switching node. Connect to the output inductor, re-circulating diode, and bootstrap capacitor.
2 BST 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.
3 RCL 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.
Toff = 10–5 / (0.285 + (FB / 6.35 × 10−6 × RCL))
4 RTN G Ground pin: ground for the entire circuit.
5 FB 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.
6 RON/SD 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 can be used for remote shutdown.
Ton = 1.25 × 10–10 RON / VIN
7 VCC P Output from the internal high voltage series pass regulator. Regulated at 7 V. If an auxiliary voltage is available to raise the voltage on this pin, above the regulation set point (7 V), the internal series pass regulator will shutdown, reducing the IC power dissipation. Do not exceed 14 V. This voltage provides gate drive power for the internal buck switch. An internal diode is provided between this pin and the BST pin. A local 0.1-µF decoupling capacitor is recommended. Series pass regulator is current limited to 10 mA.
8 VIN P Input voltage: recommended operating range is 9.5 V to 95 V.
— EP G Exposed pad: the exposed pad has no electrical contact. Connect to system ground plane for reduced thermal resistance (WSON package only).
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