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
6.6
Typical Characteristics
Figure 6-1
Efficiency vs Output Current, Skip-mode, Internal VCC LDO
Figure 6-3
Safe Operating Area, V
OUT
= 1.0 V
Figure 6-5
Safe Operating Area, V
OUT
= 5 V
Figure 6-7
I
Q(VIN)
vs Junction Temperature
V
IN
= 12 V
I
VCC
= 2 mA
Figure 6-9
VCC LDO vs Junction Temperature
V
IN
= 12 V
Figure 6-11
Switching Frequency vs Junction Temperature
V
IN
= 12 V
Figure 6-13
R
DSON(HS)
vs Junction Temperature
Figure 6-2
Efficiency vs Output Current, FCCM, Internal VCC LDO
Figure 6-4
Safe Operating Area, V
OUT
= 1.0 V
Figure 6-6
Safe Operating Area, V
OUT
= 5 V
V
IN
= 12 V
V
EN
= 0 V
Internal VCC LDO
Figure 6-8
I
SD(VIN)
vs Junction Temperature
V
IN
= 12 V
Figure 6-10
V
INTREF
vs Junction Temperature
V
IN
= 12 V
Figure 6-12
I
SS(source)
vs Junction Temperature
V
IN
= 12 V
Figure 6-14
R
DSON(LS)
vs Junction Temperature