SBVS343A
March 2019 – September 2019
TPS7A78
PRODUCTION DATA.
1
Features
2
Applications
3
Description
Device Images
Typical Schematic Half-Bridge Configuration
Typical Schematic Full-Bridge Configuration
4
Revision History
5
Pin Configuration and Functions
Pin 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
Timing Requirements
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Active Bridge Control
7.3.2
Full-Bridge (FB) and Half-Bridge (HB) Configurations
7.3.3
4:1 Switched-Capacitor Voltage Reduction
7.3.4
Undervoltage Lockout Circuits (VUVLO_SCIN) and (VUVLO_LDO_IN)
7.3.5
Dropout Voltage Regulation
7.3.6
Current Limit
7.3.7
Programmable Power-Fail Detection
7.3.8
Power-Good (PG) Detection
7.3.9
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
Normal Operation
7.4.2
Dropout Mode
7.4.3
Disabled Mode
8
Application and Implementation
8.1
Application Information
8.1.1
Recommended Capacitor Types
8.1.2
Input and Output Capacitors Requirements
8.1.3
Startup Behavior
8.1.4
Load Transient
8.1.5
Standby Power and Output Efficiency
8.1.6
Reverse Current
8.1.7
Switched-Capacitor Stage Output Impedance
8.1.8
Power Dissipation (PD)
8.1.9
Estimating Junction Temperature
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Calculating the Cap-Drop Capacitor CS
8.2.2.1.1
CS Calculations for the Typical Design
8.2.2.2
Calculating the Surge Resistor RS
8.2.2.2.1
RS Calculations for the Typical Design
8.2.2.3
Checking for the Device Maximum ISHUNT Current
8.2.2.3.1
ISHUNT Calculations for the Typical Design
8.2.2.4
Calculating the Bulk Capacitor CSCIN
8.2.2.4.1
CSCIN Calculations for the Typical Design
8.2.2.5
Calculating the PFD Pin Resistor Dividers for a Power-Fail Detection
8.2.2.5.1
PFD Pin Resistor Divider Calculations for the Typical Design
8.2.2.6
Summary of the Typical Application Design Components
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Device Support
11.1.1
Development Support
11.1.1.1
Evaluation Module
11.1.1.2
SIMPLIS Model
11.1.2
Device Nomenclature
11.2
Documentation Support
11.2.1
Related Documentation
11.3
Receiving Notification of Documentation Updates
11.4
Community Resources
11.5
Trademarks
11.6
Electrostatic Discharge Caution
11.7
Glossary
12
Mechanical, Packaging, and Orderable Information
7.3
Feature Description