ZHCS539O September   2008  – November 2014 LM22673 , LM22673-Q1

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings
    3. 6.3 Handling Ratings: LM22673-Q1
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Thermal Information
    6. 6.6 Electrical 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 UVLO
      2. 7.3.2 Soft-Start
      3. 7.3.3 Boot-Strap Supply
      4. 7.3.4 Internal Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Current Limit
      2. 7.4.2 Current-Limit Adjustment
      3. 7.4.3 Thermal Protection
      4. 7.4.4 Duty-Cycle Limits
  8. 8 Applications and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Output Voltage Divider Selection
      2. 8.1.2 Power Diode
    2. 8.2 Typical Application
      1. 8.2.1 Typical Buck Regulator Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 External Components
          2. 8.2.1.2.2 Inductor
          3. 8.2.1.2.3 Input Capacitor
          4. 8.2.1.2.4 Output Capacitor
          5. 8.2.1.2.5 Boot-Strap Capacitor
        3. 8.2.1.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Thermal Considerations
  11. 11器件和文档支持
    1. 11.1 文档支持
      1. 11.1.1 相关文档　
    2. 11.2 相关链接
    3. 11.3 商标
    4. 11.4 静电放电警告
    5. 11.5 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

8-Pin
HSOP
Top View
LM22673 LM22673-Q1 30076240.gif
7-Pin
PFM
Top View
LM22673 LM22673-Q1 30076202.gif

Pin Functions

PIN TYPE DESCRIPTION APPLICATION INFORMATION
NAME SO
PowerPAD		 PFM
BOOT 1 3 I Bootstrap input Provides the gate voltage for the high side NFET.
NC 2 — — Not Connected Pin is not electrically connected inside the chip. Pin does function as thermal conductor.
IADJ 3 5 I Current limit adjust input pin A resistor attached between this pin and GND can be used to set the current limit threshold. Pin can be left floating and internal setting will be default.
FB 4 6 I Feedback input Feedback input to regulator.
SS 5 7 Soft-Start pin Used to increase soft-start time. See Soft-Start section of data sheet.
GND 6 4 — Ground input to regulator; system common System ground pin.
VIN 7 2 I Input voltage Supply input to the regulator.
SW 8 1 O Switch output Switching output of regulator.
EP EP EP — Exposed Pad Connect to ground. Provides thermal connection to PCB. See Thermal Considerations.