SNOSDF6 October 2023 LM74930-Q1
PRODUCTION DATA
- 1
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Charge Pump
- 7.3.2 Dual Gate Control (DGATE, HGATE)
- 7.3.3 Overcurrent Protection (CS+, CS-, ILIM, IMON, TMR)
- 7.3.4 Overcurrent Protection with Circuit Breaker (ILIM, TMR)
- 7.3.5 Overcurrent Protection With Latch-Off
- 7.3.6 Short-Circuit Protection (ISCP)
- 7.3.7 Analog Current Monitor Output (IMON)
- 7.3.8 Overvoltage and Undervoltage Protection (OV, UVLO, OVCLAMP)
- 7.3.9 Disabling Reverse Current Blocking Functionality (MODE)
- 7.3.10 Device Functional Modes
-
8 Applications and Implementation
- 8.1 Application Information
- 8.2
Typical Application: 200-V Unsuppressed Load Dump Protection Application
- 8.2.1 Design Requirements for 200-V Unsuppressed Load Dump Protection
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 VS Capacitance, Resistor R1 and Zener Clamp (DZ)
- 8.2.2.2 Charge Pump Capacitance VCAP
- 8.2.2.3 Input and Output Capacitance
- 8.2.2.4 Overvoltage and Undervoltage Protection Component Selection
- 8.2.2.5 Selection of Scaling Resistor (RSET) and Short-Circuit Protection Setting Resistor (RSCP)
- 8.2.2.6 Overcurrent Limit (ILIM), Circuit Breaker Timer (TMR), and Current Monitoring Output (IMON) Selection
- 8.2.2.7 Selection of Current Sense Resistor, RSNS
- 8.2.2.8 Hold-Up Capacitance
- 8.2.2.9 MOSFET Q1 Selection
- 8.2.2.10 MOSFET Q2 Selection
- 8.2.2.11 Input TVS Selection
- 8.2.3 Application Curves
- 8.3 Best Design Practices
- 8.4 Power Supply Recommendations
- 8.5 Layout
- 9 Device and Documentation Support
- 10Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
- RGE|24
Thermal pad, mechanical data (Package|Pins)
- RGE|24
Orderable Information
6.7 Typical Characteristics
Figure 6-1 Operating Quiescent Current vs Supply Voltage
A.
Figure 6-3 Charge Pump Current vs Supply Voltage at CAP – VS ≥ 6 V
A.
Figure 6-5 DGATE Drive Voltage vs Supply Voltage
A.
Figure 6-7 ANODE Leakage Current vs Reverse ANODE Voltage
A.
Figure 6-9 OV Threshold vs Temperature
Figure 6-11 ISCP to CS– Threshold vs Temperature (HV SCP Comparator)
Figure 6-13 ISCP Bias Current vs Temperature
Figure 6-15 VS POR Threshold vs Temperature
Figure 6-17 DGATE Turn-On Delay During Forward Conduction
Figure 6-19 HGATE Turn-OFF Delay During Output Short Circuit Condition
Figure 6-2 Shutdown Current vs Supply Voltage
A.
Figure 6-4 Charge Pump V-I Characteristics at VS ≥ 12 V
A.
Figure 6-6 HGATE Drive Voltage vs Supply Voltage
A.
Figure 6-8 UVLO Threshold vs Temperature
A.
Figure 6-10 Charge Pump UVLO Threshold vs Temperature
Figure 6-12 ISCP to CS– Threshold vs Temperature (LV SCP Comparator)
A.
Figure 6-14 VA POR Threshold vs Temperature
Figure 6-16 DGATE Turn OFF Delay
Figure 6-18 HGATE Turn-OFF Delay During Input Overvoltage Condition
Figure 6-20 Current Monitor Output vs Sense Voltage (RIMON = 5 kΩ, RSET = 50 Ω)