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TPS549A20 1.5-V to 20-V (4.5-V to 25-V Bias) Input, 15-A Synchronous Step-Down SWIFT™ Converter With PMBus™
SLUSC79A
November 2015 – December 2015
TPS549A20
PRODUCTION DATA.
CONTENTS
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TPS549A20 1.5-V to 20-V (4.5-V to 25-V Bias) Input, 15-A Synchronous Step-Down SWIFT™ Converter With PMBus™
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
Electrical Characteristics
6.5
Thermal Information
6.6
Typical Characteristics
6.7
Thermal Performance
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagrams
7.3
Feature Description
7.3.1
Powergood
7.3.2
D-CAP3 Control and Mode Selection
7.3.3
D-CAP3 Mode
7.3.4
Sample and Hold Circuitry
7.3.5
Adaptive Zero-Crossing
7.3.6
Forced Continuous-Conduction Mode
7.3.7
Current Sense and Overcurrent Protection
7.3.8
Overvoltage and Undervoltage Protection
7.3.9
Out-of-Bounds Operation (OOB)
7.3.10
UVLO Protection
7.3.11
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
Auto-Skip Eco-Mode Light-Load Operation
7.4.2
Forced Continuous-Conduction Mode
7.5
Programming
7.5.1
The PMBus General Descriptions
7.5.2
PMBus Slave Address Selection
7.5.3
PMBus Address Selection
7.5.4
Supported Formats
7.5.4.1
Direct Format: Write
7.5.4.2
Combined Format: Read
7.5.4.3
Stop-Separated Reads
7.5.5
Supported PMBus Commands
7.5.5.1
Unsupported PMBus Commands
7.5.5.2
OPERATION [01h] (R/W Byte)
7.5.5.3
ON_OFF_CONFIG [02h] (R/W Byte)
7.5.5.4
WRITE_PROTECT [10h] (R/W Byte)
7.5.6
CLEAR_FAULTS [03h] (Send Byte)
7.5.7
STORE_DEFAULT_ALL [11h] (Send Byte)
7.5.8
RESTORE_DEFAULT_ALL [12h] (Send Byte)
7.5.9
STATUS_WORD [79h] (Read Word)
7.5.10
CUSTOM_REG (MFR_SPECIFIC_00) [D0h] (R/W Byte)
7.5.11
DELAY_CONTROL (MFR_SPECIFIC_01) [D1h] (R/W Byte)
7.5.12
MODE_SOFT_START_CONFIG (MFR_SPECIFIC_02) [D2h] (R/W Byte)
7.5.13
FREQUENCY_CONFIG (MFR_SPECIFIC_03) [D3h] (R/W Byte)
7.5.14
VOUT_ADJUSTMENT (MFR_SPECIFIC_04) [D4h] (R/W Byte)
7.5.15
Output Voltage Fine Adjustment Soft Slew Rate
7.5.16
VOUT_MARGIN (MFR_SPECIFIC_05) [D5h] (R/W Byte)
7.5.17
Output Voltage Margin Adjustment Soft-Slew Rate
7.5.18
UVLO_THRESHOLD (MFR_SPECIFIC_06) [D6h]
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
Choose the Switching Frequency
8.2.2.2
Choose the Operation Mode
8.2.2.3
Choose the Inductor
8.2.2.4
Choose the Output Capacitor
8.2.2.5
Determine the Value of R1 and R2
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
Documentation Support
11.2
Trademarks
11.3
Electrostatic Discharge Caution
11.4
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
RVE|28
MPQF709
Thermal pad, mechanical data (Package|Pins)
RVE|28
QFND366A
Orderable Information
slusc79a_oa
slusc79a_pm
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