SLUS907K
January 2009 – June 2019
TPS2421-1
,
TPS2421-2
PRODUCTION DATA.
1
Features
2
Applications
3
Description
Device Images
Typical Application
4
Revision History
5
Device Comparison Table
6
Pin Configuration and Functions
Pin 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
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
CT
8.3.2
FLT
8.3.3
GND
8.3.4
ISET
8.3.5
VIN
8.3.6
VOUT
8.3.7
PG
8.4
Device Functional Modes
8.4.1
Startup
8.4.2
Maximum Allowable Load to Ensure Successful Startup
8.4.2.1
Enable Pin Considerations
8.4.2.2
Fault Timer
8.4.2.3
Normal Operation
8.4.2.4
Startup into a Short
8.4.3
Shutdown Modes
8.4.3.1
Hard Overload - Fast Trip
8.4.3.2
Overcurrent Shutdown
8.5
Programming
8.5.1
Fault (ISET) and Current-Limit (ILIM) Thresholds
9
Application and Implementation
9.1
Application Information
9.2
Typical Application
9.2.1
Design Requirements
9.2.2
Detailed Design Procedure
9.2.2.1
Transient Protection
9.2.3
Application Curves
10
Power Supply Recommendations
10.1
PowerPad™
11
Layout
11.1
Layout Guidelines
11.2
Layout Example
12
Device and Documentation Support
12.1
Documentation Support
12.1.1
Related Documentation
12.2
Related Links
12.3
Receiving Notification of Documentation Updates
12.4
Community Resource
12.5
Trademarks
12.6
Electrostatic Discharge Caution
12.7
Glossary
13
Mechanical, Packaging, and Orderable Information
7.6
Typical Characteristics
Figure 1.
Fault Current vs Junction Temperature
Figure 3.
Power Limit vs Junction Temperature
Figure 5.
3-V Startup into 1-Ω Load
Figure 7.
3-V Hard Overload, Load Stepped
from 3.8 A to 7.1 A
Figure 9.
3 V, 1600 μF Added to 3.5-A Load
Figure 11.
Startup into a Short Circuit Output
Figure 2.
Fault Timer Threshold Voltage vs Junction Temperature
Figure 4.
Supply Current vs Junction Temperature
Figure 6.
3-V Firm Overload, Load Stepped
from 3.8 A to 5.5 A
Figure 8.
3-V Output Shorted While Under 3.5-A Load
Figure 10.
3-V Retry Startup into 1-Ω, 2200-μF Load