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LM7481-Q1 Ideal Diode Controller with Active Rectification and Load Dump Protection
SNOSD98A
May 2020 – December 2020
LM7481-Q1
PRODUCTION DATA
CONTENTS
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LM7481-Q1 Ideal Diode Controller with Active Rectification and Load Dump Protection
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
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Switching Characteristics
6.7
Typical Characteristics
7
Parameter Measurement Information
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Charge Pump
8.3.2
Dual Gate Control (DGATE, HGATE)
8.3.2.1
Reverse Battery Protection (A, C, DGATE)
8.3.2.2
Load Disconnect Switch Control (HGATE, OUT)
8.3.3
Over Voltage Protection and Battery Voltage sensing (VSNS, SW, OV)
8.3.4
Low Iq Shutdown and Under Voltage Lockout (EN/UVLO)
8.4
Device Functional Modes
8.5
Application Examples
8.5.1
Redundant Supply OR-ing with Inrush Current Limiting, Over Voltage Protection and ON/OFF Control
9
Application and Implementation
9.1
Application Information
9.2
Typical 12-V Reverse Battery Protection Application
9.2.1
Design Requirements for 12-V Battery Protection
9.2.2
Automotive Reverse Battery Protection
9.2.3
Input Transient Protection: ISO 7637-2 Pulse 1
9.2.4
AC Super Imposed Input Rectification: ISO 16750-2 and LV124 E-06
9.2.5
Input Micro-Short Protection: LV124 E-10
9.2.6
Detailed Design Procedure
9.2.6.1
Design Considerations
9.2.6.2
Charge Pump Capacitance VCAP
9.2.6.3
Input and Output Capacitance
9.2.6.4
Hold-up Capacitance
9.2.6.5
Over Voltage Protection and Battery Monitor
9.2.7
MOSFET Selection: Blocking MOSFET Q1
9.2.8
MOSFET Selection: Hot-Swap MOSFET Q2
9.2.9
TVS selection
9.2.10
Application Curves
9.3
Do's and Don'ts
10
Power Supply Recommendations
10.1
Transient Protection
10.2
TVS Selection for 12-V Battery Systems
10.3
TVS Selection for 24-V Battery Systems
11
Layout
11.1
Layout Guidelines
11.2
Layout Example
12
Device and Documentation Support
12.1
Receiving Notification of Documentation Updates
12.2
Support Resources
12.3
Trademarks
12.4
Electrostatic Discharge Caution
12.5
Glossary
13
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
DRR|12
MPSS085A
Thermal pad, mechanical data (Package|Pins)
DRR|12
PPTD366A
Orderable Information
snosd98a_oa
snosd98a_pm
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