SLVSE78D
March 2020 – July 2021
TPS548A29
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
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Internal VCC LDO And Using External Bias On VCC Pin
7.3.2
Enable
7.3.3
Output Voltage Setting
7.3.3.1
Remote Sense
7.3.4
Internal Fixed Soft Start and External Adjustable Soft Start
7.3.5
External REFIN For Output Voltage Tracking
7.3.6
Frequency and Operation Mode Selection
7.3.7
D-CAP3 Control
7.3.8
Low-side FET Zero-Crossing
7.3.9
Current Sense and Positive Overcurrent Protection
7.3.10
Low-side FET Negative Current Limit
7.3.11
Power Good
7.3.12
Overvoltage and Undervoltage Protection
7.3.13
Out-Of-Bounds (OOB) Operation
7.3.14
Output Voltage Discharge
7.3.15
UVLO Protection
7.3.16
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
Auto-Skip Eco-mode Light Load Operation
7.4.2
Forced Continuous-Conduction Mode
7.4.3
Powering The Device From A 12-V Bus
7.4.4
Powering The Device From A 3.3-V Bus
7.4.5
Powering The Device From A Split-rail Configuration
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Output Voltage Setting Point
8.2.2.2
Choose the Switching Frequency and the Operation Mode
8.2.2.3
Choose the Inductor
8.2.2.4
Set the Current Limit (TRIP)
8.2.2.5
Choose the Output Capacitor
8.2.2.6
Choose the Input Capacitors (CIN)
8.2.2.7
Soft Start Capacitor (SS/REFIN Pin)
8.2.2.8
EN Pin Resistor Divider
8.2.2.9
VCC Bypass Capacitor
8.2.2.10
BOOT Capacitor
8.2.2.11
PGOOD Pullup Resistor
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
10.2.1
Thermal Performance On TI EVM
11
Device and Documentation Support
11.1
Documentation Support
11.1.1
Related Documentation
11.2
Receiving Notification of Documentation Updates
11.3
Support Resources
11.4
Trademarks
11.5
Electrostatic Discharge Caution
11.6
Glossary
12
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
RWW|21
MPQF511B
Thermal pad, mechanical data (Package|Pins)
Orderable Information
slvse78d_oa
slvse78d_pm
8.2.3
Application Curves
Figure 8-2
Efficiency vs Output Current, VCC = 5.0V External VCC Bias
Figure 8-4
Switching Frequency vs Output Current
Figure 8-6
Switching Frequency vs Output Voltage
Figure 8-8
Output Voltage vs Output Current
Figure 8-10
Output Voltage vs Output Current, VCC = 5.0V External Bias
Figure 8-12
Output Voltage vs Input Voltage VCC = 5.0V External Bias
Figure 8-14
Enable Start-Up, Full Load
Figure 8-16
Enable to Power Up Iout = 0.1 A
Figure 8-18
Enable Start-Up, Prebias
Figure 8-20
Enable Power Up, Skip
Figure 8-22
Enable Power Up into Pre-bias, Skip
Figure 8-24
FCCM Mode Load Transient
Figure 8-26
Output Voltage Ripple
Figure 8-28
Output Voltage Ripple
Figure 8-30
Output Voltage Ripple, Skip
Figure 8-32
Overcurrent Protection
Figure 8-34
Frequency Response, 15-A Load
Figure 8-3
Efficiency vs Output Current, VCC = 5.0V External VCC Bias
Figure 8-5
Switching Frequency vs Input Voltage
Figure 8-7
Output Voltage vs Output Current
Figure 8-9
Output Voltage vs Output Current, VCC = 5.0V External Bias
Figure 8-11
Output Voltage vs Input Voltage VCC = Int
Figure 8-13
ICC Current vs External VCC Voltage
Figure 8-15
Enable Power Down Full Load
Figure 8-17
Enable Power Down Iout = 0 A
Figure 8-19
Prebias Power Up
Figure 8-21
Enable Power Down, Skip
Figure 8-23
Enable Power Down with Pre-bias, Skip
Figure 8-25
Unload Transient
Figure 8-27
Output Voltage Ripple
Figure 8-29
Output Voltage Ripple
Figure 8-31
Output Voltage Ripple, Skip
Figure 8-33
Enabled into Overcurrent