SNVSBV3A July 2021 – July 2021 TPS548B27
PRODUCTION DATA
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
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
- 7.3.4 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
-
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
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
- RYL|19
Thermal pad, mechanical data (Package|Pins)
Orderable Information
8.2.3 Application Curves
Figure 8-2 Efficiency vs Output Current, Internal VCC Bias, FCCM
Figure 8-4 Efficiency vs Output Current, VCC = 3.3-V External Bias, FCCM
Figure 8-6 Switching Frequency vs Input Voltage
Figure 8-8 Output Voltage vs Output Current, Internal VCC Bias, FCCM
Figure 8-10 Output Voltage vs Output Current, VCC = 3.3-V External Bias, FCCM
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 Unload Transient
Figure 8-22 Output Voltage Ripple, FCCM, 0.5-A Load
Figure 8-24 Output Voltage Ripple, Skip, 0.01-A Load
Figure 8-26 Overtemperature Protection in FCCM
Figure 8-28 Enabled into OvercurrentFigure 8-3 Efficiency vs Output Current, Internal VCC Bias, Skip
Figure 8-5 Switching Frequency vs Output Current
Figure 8-7 Output Voltage vs Output Current, Internal VCC Bias, Skip
Figure 8-9 Output Voltage vs Output Current, VCC = 3.3-V External Bias, Skip
Figure 8-11 Output Voltage vs Input Voltage, Internal VCC Bias
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 Output Voltage Ripple, FCCM, 0-A Load
Figure 8-23 Output Voltage Ripple, FCCM, 20-A Load
Figure 8-25 Output Voltage Ripple, Skip, 1-A Load
Figure 8-27 Exiting Overtemperature Protection in FCCM
Figure 8-29 Hiccup Overcurrent