ZHCS538M
September 2008 – October 2020
LM22678
,
LM22678-Q1
PRODUCTION DATA
1
特性
2
应用
3
说明
4
Revision History
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
Handling Ratings: LM22678
6.3
Handling Ratings: LM22678-Q1
6.4
Recommended Operating Conditions
6.5
Thermal Information
6.6
Electrical Characteristics
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Precision Enable and UVLO
7.3.2
Soft Start
7.3.3
Bootstrap Supply
7.3.4
Internal Loop Compensation
7.4
Device Functional Modes
7.4.1
Shutdown Mode
7.4.2
Active Mode
7.4.3
Current Limit
7.4.4
Thermal Protection
7.4.5
Duty-Cycle Limits
8
Application and Implementation
8.1
Application Information
8.1.1
Output Voltage Divider Selection
8.1.2
Power Diode
8.2
Typical Applications
8.2.1
Typical Buck Regulator Application
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.2.1
External Components
8.2.1.2.1.1
Inductor
8.2.1.2.2
Input Capacitor
8.2.1.2.3
Output Capacitor
8.2.1.2.4
Bootstrap Capacitor
8.2.1.3
Application Curves
9
Layout
9.1
Layout Guidelines
9.2
Layout Example
9.3
Thermal Considerations
10
Device and Documentation Support
10.1
Documentation Support
10.1.1
Related Documentation
10.2
支持资源
10.3
接收文档更新通知
10.4
静电放电警告
10.5
术语表
封装选项
机械数据 (封装 | 引脚)
NDR|7
MMSF023A
散热焊盘机械数据 (封装 | 引脚)
订购信息
zhcs538m_oa
zhcs538m_pm
8.2.1.3
Application Curves
Figure 8-3
Efficiency vs I
OUT
and V
IN
, V
OUT
= 3.3 V
Figure 8-4
Normalized Feedback Voltage vs Input Voltage