ZHCSFR1B
December 2016 – March 2018
LMR23625-Q1
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
简化原理图
效率与负载间的关系,VIN = 12V,PFM 选项
4
修订历史记录
5
Device Comparison
6
Pin Configuration and Functions
Pin Functions
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Timing Characteristics
7.7
Switching Characteristics
7.8
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Fixed-Frequency Peak-Current-Mode Control
8.3.2
Adjustable Output Voltage
8.3.3
EN/SYNC
8.3.4
VCC, UVLO
8.3.5
Minimum ON-Time, Minimum OFF-Time and Frequency Foldback at Dropout Conditions
8.3.6
Power Good (PGOOD)
8.3.7
Internal Compensation and CFF
8.3.8
Bootstrap Voltage (BOOT)
8.3.9
Overcurrent and Short-Circuit Protection
8.3.10
Thermal Shutdown
8.4
Device Functional Modes
8.4.1
Shutdown Mode
8.4.2
Active Mode
8.4.3
CCM Mode
8.4.4
Light Load Operation (PFM Option)
8.4.5
Light Load Operation (FPWM Option)
9
Application and Implementation
9.1
Application Information
9.2
Typical Applications
9.2.1
Design Requirements
9.2.2
Detailed Design Procedure
9.2.2.1
Custom Design With WEBENCH® Tools
9.2.2.2
Output Voltage Setpoint
9.2.2.3
Switching Frequency
9.2.2.4
Inductor Selection
9.2.2.5
Output Capacitor Selection
9.2.2.6
Feed-Forward Capacitor
9.2.2.7
Input Capacitor Selection
9.2.2.8
Bootstrap Capacitor Selection
9.2.2.9
VCC Capacitor Selection
9.2.2.10
Undervoltage Lockout Setpoint
9.2.3
Application Curves
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.1.1
Compact Layout for EMI Reduction
11.1.2
Ground Plane and Thermal Considerations
11.1.3
Feedback Resistors
11.2
Layout Examples
12
器件和文档支持
12.1
器件支持
12.1.1
开发支持
12.1.1.1
使用 WEBENCH® 工具创建定制设计
12.2
接收文档更新通知
12.3
社区资源
12.4
商标
12.5
静电放电警告
12.6
Glossary
13
机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
DDA|8
MPDS092F
DRR|12
MPSS085A
散热焊盘机械数据 (封装 | 引脚)
DDA|8
PPTD178C
DRR|12
PPTD338C
订购信息
zhcsfr1b_oa
zhcsfr1b_pm
9.2.2
Detailed Design Procedure