SLVSFR9B
September 2021 – August 2022
LM74722-Q1
PRODUCTION DATA
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
Dual Gate Control (GATE, PD)
8.3.1.1
Reverse Battery Protection (A, C, GATE)
8.3.1.2
Load Disconnect Switch Control (PD)
8.3.1.3
Overvoltage Protection and Battery Voltage Sensing (VSNS, SW, OV)
8.3.2
Boost Regulator
8.4
Device Functional Modes
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
9.2.1.1
Automotive Reverse Battery Protection
9.2.1.1.1
Input Transient Protection: ISO 7637-2 Pulse 1
9.2.1.1.2
AC Super Imposed Input Rectification: ISO 16750-2 and LV124 E-06
9.2.1.1.3
Input Micro-Short Protection: LV124 E-10
9.2.2
Detailed Design Procedure
9.2.2.1
Design Considerations
9.2.2.2
Boost Converter Components (C2, C3, L1)
9.2.2.3
Input and Output Capacitance
9.2.2.4
Hold-Up Capacitance
9.2.2.5
Overvoltage Protection and Battery Monitor
9.2.2.6
MOSFET Selection: Blocking MOSFET Q1
9.2.2.7
MOSFET Selection: Load Disconnect MOSFET Q2
9.2.2.8
TVS Selection
9.2.3
Application Curves
9.3
What to Do and What Not to Do
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
1
Features
AEC-Q100 qualified with the following results
Device temperature grade 1:
–40°C to +125°C ambient operating temperature range
Device HBM ESD classification level 2
Device CDM ESD classification level C4B
3-V to 65-V input range
Reverse input protection down to –65 V
Low quiescent current 35 µA (max) in operation
Low 3.3-µA (max) shutdown current (EN = Low)
Ideal diode operation with 13-mV A to C forward voltage drop regulation
Drives external back-to-back N-Channel MOSFETs
Integrated 30-mA boost regulator
Active rectification up to 200 kHz
Fast response to reverse current blocking: 0.5 µs
Fast forward GATE turn ON delay: 0.72 µs
Adjustable overvoltage protection
Meets automotive ISO7637 transient requirements with a suitable TVS diode
Available in space saving 12-pin WSON package