SNOSDD8
December 2022
LM7480
PRODUCTION DATA
1
Features
2
Applications
3
Description
4
Revision History
5
Device Comparison Table
6
Pin Configuration and 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
Switching Characteristics
7.7
Typical Characteristics
8
Parameter Measurement Information
9
Detailed Description
9.1
Overview
9.2
Functional Block Diagram
9.3
Feature Description
9.3.1
Charge Pump
9.3.2
Dual Gate Control (DGATE, HGATE)
9.3.2.1
Reverse Battery Protection (A, C, DGATE)
9.3.2.2
Load Disconnect Switch Control (HGATE, OUT)
9.3.3
Overvoltage Protection and Battery Voltage Sensing (VSNS, SW, OV)
9.3.4
Low Iq Shutdown and Under Voltage Lockout (EN/UVLO)
9.4
Device Functional Modes
9.5
Application Examples
9.5.1
Redundant Supply OR-ing with Inrush Current Limiting, Overvoltage Protection and ON/OFF Control
9.5.2
Ideal Diode With Unsuppressed Load Dump Protection
10
Applications and Implementation
10.1
Application Information
10.2
Typical 12-V Reverse Battery Protection Application
10.2.1
Design Requirements for 12-V Battery Protection
10.2.2
Automotive Reverse Battery Protection
10.2.3
Detailed Design Procedure
10.2.3.1
Design Considerations
10.2.3.2
Charge Pump Capacitance VCAP
10.2.3.3
Input and Output Capacitance
10.2.3.4
Hold-Up Capacitance
10.2.3.5
Overvoltage Protection and Battery Monitor
10.2.4
MOSFET Selection: Blocking MOSFET Q1
10.2.5
MOSFET Selection: Hot-Swap MOSFET Q2
10.2.6
TVS Selection
10.2.7
Application Curves
10.3
200-V Unsuppressed Load Dump Protection Application
10.3.1
Design Requirements for 200-V Unsuppressed Load Dump Protection
10.3.2
Design Procedure
10.3.2.1
Boost Converter Components (C2, C3, L1)
10.3.2.2
Input and Output Capacitance
10.3.2.3
VS Capacitance, Resistor, and Zener Clamp
10.3.2.4
Overvoltage Protection and Output Clamp
10.3.2.5
MOSFET Q1 Selection
10.3.2.6
Input TVS Selection
10.3.2.7
MOSFET Q2 Selection
10.3.3
Application Curves
10.4
Do's and Don'ts
10.5
Power Supply Recommendations
10.5.1
Transient Protection
10.5.2
TVS Selection for 12-V Battery Systems
10.5.3
TVS Selection for 24-V Battery Systems
10.6
Layout
10.6.1
Layout Guidelines
10.6.2
Layout Example
11
Device and Documentation Support
11.1
Receiving Notification of Documentation Updates
11.2
Support Resources
11.3
Trademarks
11.4
Electrostatic Discharge Caution
11.5
Glossary
12
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
DRR|12
MPSS085A
Thermal pad, mechanical data (Package|Pins)
DRR|12
PPTD366A
Orderable Information
snosdd8_oa
snosdd8_pm
10.2.7
Application Curves
Figure 10-2
Startup 12 V with EN Pulled to VIN
Figure 10-4
Reverse Input Voltage –14 V
Figure 10-6
Inrush Current with no Load at Output
Figure 10-8
Hot-Plug into 12 V
Figure 10-10
DGATE Turn ON with Enable
Figure 10-12
Turn OFF with Enable Control
Figure 10-14
Overvoltage Recovery
Figure 10-16
Turn OFF Delay - DGATE
Figure 10-18
Load Transient 100 mA to 5 A
Figure 10-3
Startup 12 V showing Charge Pump VCAP
Figure 10-5
Reverse Input Voltage –14 V for 60 s
Figure 10-7
Inrush Current with 60-Ω Load
Figure 10-9
Output Turn ON with Enable
Figure 10-11
Turn ON with VCAP ON - EN rising from 0.8 V
Figure 10-13
Overvoltage Protection
Figure 10-15
Turn ON delay - HGATE
Figure 10-17
Turn OFF Delay - HGATE
Figure 10-19
Startup 1-A Load 1 ms After Output Powers Up