SNVSBC5A
December 2020 – December 2022
TPS548B28
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 Mode
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
8.3
Power Supply Recommendations
8.4
Layout
8.4.1
Layout Guidelines
8.4.2
Layout Example
8.4.2.1
Thermal Performance On TI EVM
9
Device and Documentation Support
9.1
Documentation Support
9.1.1
Related Documentation
9.2
Receiving Notification of Documentation Updates
9.3
Support Resources
9.4
Trademarks
9.5
Electrostatic Discharge Caution
9.6
Glossary
10
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
RWW|21
MPQF511B
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snvsbc5a_oa
snvsbc5a_pm
8.2.3
Application Curves
Figure 8-2
Efficiency vs Output Current, Internal VCC Bias
Figure 8-4
Efficiency vs Output Current, VCC = 3.3V External VCC Bias
Figure 8-6
Switching Frequency vs Input Voltage
Figure 8-8
Output Voltage vs Output Current
Figure 8-10
Output Voltage vs Output Current, VCC = 3.3-V External Bias
Figure 8-12
Output Voltage vs Input Voltage VCC = 3.3-V External Bias
Figure 8-14
Enable Start-Up, Prebias
Figure 8-16
Enable Power Up, Skip
Figure 8-18
Enable Power Up into Pre-bias, Skip
Figure 8-20
Load Transient
Figure 8-22
Output Voltage Ripple
Figure 8-24
Output Voltage Ripple
Figure 8-26
Output Voltage Ripple, Skip
Figure 8-28
Exiting Overtemperature Protection in FCCM
Figure 8-30
Hiccup Overcurrent
Figure 8-3
Efficiency vs Output Current, Internal VCC Bias
Figure 8-5
Switching Frequency vs Output Current
Figure 8-7
Output Voltage vs Output Current
Figure 8-9
Output Voltage vs Output Current, VCC = 3.3-V External Bias
Figure 8-11
Output Voltage vs Input Voltage VCC = Int
Figure 8-13
ICC Current vs External VCC Voltage
Figure 8-15
Prebias Power-Down
Figure 8-17
Enable Power Down, Skip
Figure 8-19
Enable Power Down with Pre-bias, Skip
Figure 8-21
Unload Transient
Figure 8-23
Output Voltage Ripple
Figure 8-25
Output Voltage Ripple, Skip
Figure 8-27
Over Temperature Protection in FCCM
Figure 8-29
Enabled into Overcurrent