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LM3489x Hysteretic PFET Buck Controller With Enable Pin
SNVS443C
May 2006 – December 2016
LM3489
,
LM3489-Q1
PRODUCTION DATA.
CONTENTS
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LM3489x Hysteretic PFET Buck Controller With Enable Pin
1
Features
2
Applications
3
Description
4
Revision History
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings: LM3489
6.3
ESD Ratings: LM3489-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
Hysteretic Control Circuit
7.3.1.1
Delay
7.3.2
Current Limit Operation
7.3.3
Start Up
7.3.4
External Sense Resistor
7.3.5
PGATE
7.3.6
Adjustable UVLO
7.4
Device Functional Mode
7.4.1
Device Enable and Shutdown
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Inductor Selection (L)
8.2.2.2
Output Capacitor Selection (COUT)
8.2.2.3
Input Capacitor Selection (CIN)
8.2.2.4
Programming the Current Limit (RADJ)
8.2.2.5
Catch Diode Selection (D1)
8.2.2.6
P-Channel MOSFET Selection (Q1)
8.2.2.7
Interfacing With the Enable Pin
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Examples
11
Device and Documentation Support
11.1
Related Links
11.2
Receiving Notification of Documentation Updates
11.3
Community Resources
11.4
Trademarks
11.5
Electrostatic Discharge Caution
11.6
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
封装选项
机械数据 (封装 | 引脚)
DGK|8
MPDS028E
散热焊盘机械数据 (封装 | 引脚)
订购信息
snvs443c_oa
snvs443c_pm
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