ZHCSIJ1E June   1999  – July 2018 LM2574 , LM2574HV

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      典型应用（固定输出电压版本）
  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 for All Output Voltage Versions
    6. 6.6  Electrical Characteristics – 3.3-V Version
    7. 6.7  Electrical Characteristics – 5-V Version
    8. 6.8  Electrical Characteristics – 12-V Version
    9. 6.9  Electrical Characteristics – 15-V Version
    10. 6.10 Electrical Characteristics – Adjustable Version
    11. 6.11 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 Current Limit
      2. 7.3.2 Undervoltage Lockout
      3. 7.3.3 Delayed Start-Up
      4. 7.3.4 Adjustable Output, Low-Ripple Power Supply
    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 Input Capacitor (CIN)
      2. 8.1.2 Inductor Selection
      3. 8.1.3 Inductor Ripple Current
      4. 8.1.4 Output Capacitor
      5. 8.1.5 Catch Diode
      6. 8.1.6 Output Voltage Ripple and Transients
      7. 8.1.7 Feedback Connection
      8. 8.1.8 ON/OFF Input
      9. 8.1.9 Additional Applications
        1. 8.1.9.1 Inverting Regulator
        2. 8.1.9.2 Negative Boost Regulator
    2. 8.2 Typical Applications
      1. 8.2.1 Fixed Output Voltage Applications
        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 Inductor Selection (L1)
          3. 8.2.1.2.3 Output Capacitor Selection (COUT)
          4. 8.2.1.2.4 Catch Diode Selection (D1)
          5. 8.2.1.2.5 Input Capacitor (CIN)
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Adjustable Output Voltage Applications
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Programming Output Voltage
          2. 8.2.2.2.2 Inductor Selection (L1)
          3. 8.2.2.2.3 Output Capacitor Selection (COUT)
          4. 8.2.2.2.4 Catch Diode Selection (D1)
          5. 8.2.2.2.5 Input Capacitor (CIN)
        3. 8.2.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Grounding
    4. 10.4 Thermal Considerations
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 第三方产品免责声明
      2. 11.1.2 使用 WEBENCH® 工具创建定制设计
      3. 11.1.3 器件命名规则
        1. 11.1.3.1  降压稳压器
        2. 11.1.3.2  降压/升压稳压器
        3. 11.1.3.3  占空比 (D)
        4. 11.1.3.4  环流二极管或导流二极管
        5. 11.1.3.5  电容器等效串联电阻 (ESR)
        6. 11.1.3.6  等效串联电感 (ESL)
        7. 11.1.3.7  输出纹波电压
        8. 11.1.3.8  电容器纹波电流
        9. 11.1.3.9  待机静态电流 (ISTBY)
        10. 11.1.3.10 电感器纹波电流 (ΔiIND)
        11. 11.1.3.11 连续与非连续模式运行
        12. 11.1.3.12 电感器饱和
        13. 11.1.3.13 运算伏特微秒常数 (E × Top)
    2. 11.2 文档支持
      1. 11.2.1 相关文档
    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

6.5 Electrical Characteristics for All Output Voltage Versions

TJ = 25°C, and MIN and MAX apply over full operating temperature range. VIN = 12 V for the 3.3-V, 5-V, and adjustable version, VIN = 25 V for the 12-V version, and VIN = 30 V for the 15-V version, ILOAD = 100 mA (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN(1) TYP   MAX(1) UNIT
Ib Feedback bias current Adjustable version only, VOUT = 5 V TJ = 25°C 50 100 nA
–40°C < TJ < 125°C 500
fO Oscillator frequency See(2) TJ = 25°C 47 52 58 kHz
–40°C < TJ < 125°C 42 63
VSAT Saturation voltage IOUT = 0.5 A(3) TJ = 25°C 0.9 1.2 V
–40°C < TJ < 125°C 1.4
DC Maximum duty cycle (ON) See(4) 93% 98%
ICL Current limit Peak current(2)(3) 0.7 1 1.6 A
0.65 1.8
IL Current output leakage Output = 0 V 2 mA
Output = –1 V(5)(6) 7.5 30
IQ Quiescent current See(5) 5 10 mA
ISTBY Standby quiescent current ON/OFF pin = 5 V (OFF) 50 200 μA
ON/OFF CONTROL (SEE Figure 27)
VIH ON/OFF pin logic input level VOUT = 0 V TJ = 25°C 2.2 1.4 V
–40°C < TJ < 125°C 2.4
VIL VOUT = Nominal output voltage TJ = 25°C 1.2 1 V
–40°C < TJ < 125°C 0.8
IH ON/OFF pin input current ON/OFF pin = 5 V (OFF) 12 30 μA
IIL ON/OFF pin = 0 V (ON) 0 10 μA
(1) All limits specified at room temperature TYP and MAX. All room temperature limits are 100% production tested. All limits at temperature extremes are specified through correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level.
(2) The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2% (see Figure 6).
(3) Output pin sourcing current. No diode, inductor or capacitor connected to output pin.
(4) Feedback pin removed from output and connected to 0 V.
(5) Feedback pin removed from output and connected to 12 V for the adjustable, 3.3-V, and 5-V versions, and 25 V for the 12-V and 15-V versions, to force the output transistor OFF.
(6) VIN = 40 V (60 V for high voltage version).