Datasheet TPS54332 (Texas Instruments)
| 制造商 | Texas Instruments |
| 描述 | 3.5-A, 28-V, 1-MHz, Step-Down DC-DC Converter With Eco-Mode |
| 页数 / 页 | 34 / 1 — TPS54332. TPS54332 3.5-A, 28-V, 1-MHz, Step-Down DC-DC Converter With … |
| 修订版 | C |
| 文件格式/大小 | PDF / 1.5 Mb |
| 文件语言 | 英语 |
TPS54332. TPS54332 3.5-A, 28-V, 1-MHz, Step-Down DC-DC Converter With Eco-Mode™. 1 Features. 3 Description
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TPS54332
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TPS54332
SLVS875C – JANUARY 2009 – REVISED NOVEMBER 2014
TPS54332 3.5-A, 28-V, 1-MHz, Step-Down DC-DC Converter With Eco-Mode™ 1 Features 3 Description
The TPS54332 is a 28-V, 3.5-A non-synchronous • 3.5-V to 28-V Input Voltage Range 1 buck converter that integrates a low-RDS(on) high-side • Adjustable Output Voltage Down to 0.8 V MOSFET. To increase efficiency at light loads, a • Integrated 80-mΩ High-Side MOSFET Supports pulse-skipping Eco-Mode feature is automatically up to 3.5-A Continuous Output Current activated. Furthermore, the 1-μA shutdown supply current allows the device to be used in battery- • High Efficiency at Light Loads With a Pulse- powered applications. Current mode control with Skipping Eco-Mode™ internal slope compensation simplifies the external • Fixed 1-MHz Switching Frequency compensation calculations and reduces component • Typical 1-μA Shutdown Quiescent Current count while allowing the use of ceramic output capacitors. A resistor divider programs the hysteresis • Adjustable Slow-Start Limits Inrush Currents of the input undervoltage lockout. An overvoltage • Programmable UVLO Threshold transient protection circuit limits voltage overshoots • Overvoltage Transient Protection during start-up and transient conditions. A cycle-by- • Cycle-by-Cycle Current Limit, Frequency Foldback cycle current limit scheme, frequency foldback and and Thermal Shutdown Protection thermal shutdown protect the device and the load in the event of an overload condition. The TPS54332 is • Available in Thermally Enhanced 8-Pin SOIC available in an 8-pin SOIC PowerPAD™ package. PowerPAD™ Package • Supported by WEBENCH™ Tool
Device Information(1)
(http://www.ti.com/lsds/ti/analog/webench/overvie
PART NUMBER PACKAGE BODY SIZE (NOM)
w.page) TPS54332 SO PowerPAD (8) 4.90 mm × 3.90 mm (1) For all available packages, see the orderable addendum at
2 Applications
the end of the datasheet. • Consumer Applications such as Set-Top Boxes, CPE Equipment, LCD Displays, Peripherals, and Battery Chargers • Industrial and Car Audio Power Supplies • 5-V, 12-V and 24-V Distributed Power Systems
Simplified Schematic Efficiency
100 Ren1 V = 2.5 V O EN VIN VIN 95 Ren2 V = 5 V C I I 90 V = 12 V TPS54332 I C 85 BOOT BOOT LO 80 PH VOUT 75 SS V = 15 V
Efficiency-%
I D1 C R COMP O O1 70 C C 1 65 SS C2 VSENSE R 60 3 0 0.5 1 1.5 2 2.5 3 3.5 GND RO2
I - Output Current - A O
1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 Handling Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 Electrical Characteristics 6.6 Switching Characteristics 6.7 Typical Characteristics: Characterization Curves 6.8 Typical Characteristics: Supplemental Application Curves 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Fixed Frequency PWM Control 7.3.2 Voltage Reference (Vref) 7.3.3 Bootstrap Voltage (BOOT) 7.3.4 Enable and Adjustable Input Undervoltage Lockout (VIN UVLO) 7.3.5 Programmable Slow-Start Using SS Pin 7.3.6 Error Amplifier 7.3.7 Slope Compensation 7.3.8 Current Mode Compensation Design 7.3.9 Overcurrent Protection and Frequency Shift 7.3.10 Overvoltage Transient Protection 7.3.11 Thermal Shutdown 7.4 Device Functional Modes 7.4.1 Operation With VIN < 3.5 V 7.4.2 Operation With EN Control 7.4.3 Eco-Mode 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 Switching Frequency 8.2.2.2 Output Voltage Set Point 8.2.2.3 Input Capacitors 8.2.2.4 Output Filter Components 8.2.2.5 Inductor Selection 8.2.2.6 Capacitor Selection 8.2.2.7 Compensation Components 8.2.2.8 Bootstrap Capacitor 8.2.2.9 Catch Diode 8.2.2.10 Output Voltage Limitations 8.2.2.11 Power Dissipation Estimate 8.2.3 Application Curves 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.2 Layout Example 10.3 Estimated Circuit Area 10.4 Electromagnetic Interference (EMI) Considerations 11 Device and Documentation Support 11.1 Device Support 11.1.1 Development Support 11.2 Trademarks 11.3 Electrostatic Discharge Caution 11.4 Glossary 12 Mechanical, Packaging, and Orderable Information
TPS54332
SLVS875C – JANUARY 2009 – REVISED NOVEMBER 2014
TPS54332 3.5-A, 28-V, 1-MHz, Step-Down DC-DC Converter With Eco-Mode™ 1 Features 3 Description
The TPS54332 is a 28-V, 3.5-A non-synchronous • 3.5-V to 28-V Input Voltage Range 1 buck converter that integrates a low-RDS(on) high-side • Adjustable Output Voltage Down to 0.8 V MOSFET. To increase efficiency at light loads, a • Integrated 80-mΩ High-Side MOSFET Supports pulse-skipping Eco-Mode feature is automatically up to 3.5-A Continuous Output Current activated. Furthermore, the 1-μA shutdown supply current allows the device to be used in battery- • High Efficiency at Light Loads With a Pulse- powered applications. Current mode control with Skipping Eco-Mode™ internal slope compensation simplifies the external • Fixed 1-MHz Switching Frequency compensation calculations and reduces component • Typical 1-μA Shutdown Quiescent Current count while allowing the use of ceramic output capacitors. A resistor divider programs the hysteresis • Adjustable Slow-Start Limits Inrush Currents of the input undervoltage lockout. An overvoltage • Programmable UVLO Threshold transient protection circuit limits voltage overshoots • Overvoltage Transient Protection during start-up and transient conditions. A cycle-by- • Cycle-by-Cycle Current Limit, Frequency Foldback cycle current limit scheme, frequency foldback and and Thermal Shutdown Protection thermal shutdown protect the device and the load in the event of an overload condition. The TPS54332 is • Available in Thermally Enhanced 8-Pin SOIC available in an 8-pin SOIC PowerPAD™ package. PowerPAD™ Package • Supported by WEBENCH™ Tool
Device Information(1)
(http://www.ti.com/lsds/ti/analog/webench/overvie
PART NUMBER PACKAGE BODY SIZE (NOM)
w.page) TPS54332 SO PowerPAD (8) 4.90 mm × 3.90 mm (1) For all available packages, see the orderable addendum at
2 Applications
the end of the datasheet. • Consumer Applications such as Set-Top Boxes, CPE Equipment, LCD Displays, Peripherals, and Battery Chargers • Industrial and Car Audio Power Supplies • 5-V, 12-V and 24-V Distributed Power Systems
Simplified Schematic Efficiency
100 Ren1 V = 2.5 V O EN VIN VIN 95 Ren2 V = 5 V C I I 90 V = 12 V TPS54332 I C 85 BOOT BOOT LO 80 PH VOUT 75 SS V = 15 V
Efficiency-%
I D1 C R COMP O O1 70 C C 1 65 SS C2 VSENSE R 60 3 0 0.5 1 1.5 2 2.5 3 3.5 GND RO2
I - Output Current - A O
1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 Handling Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 Electrical Characteristics 6.6 Switching Characteristics 6.7 Typical Characteristics: Characterization Curves 6.8 Typical Characteristics: Supplemental Application Curves 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Fixed Frequency PWM Control 7.3.2 Voltage Reference (Vref) 7.3.3 Bootstrap Voltage (BOOT) 7.3.4 Enable and Adjustable Input Undervoltage Lockout (VIN UVLO) 7.3.5 Programmable Slow-Start Using SS Pin 7.3.6 Error Amplifier 7.3.7 Slope Compensation 7.3.8 Current Mode Compensation Design 7.3.9 Overcurrent Protection and Frequency Shift 7.3.10 Overvoltage Transient Protection 7.3.11 Thermal Shutdown 7.4 Device Functional Modes 7.4.1 Operation With VIN < 3.5 V 7.4.2 Operation With EN Control 7.4.3 Eco-Mode 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 Switching Frequency 8.2.2.2 Output Voltage Set Point 8.2.2.3 Input Capacitors 8.2.2.4 Output Filter Components 8.2.2.5 Inductor Selection 8.2.2.6 Capacitor Selection 8.2.2.7 Compensation Components 8.2.2.8 Bootstrap Capacitor 8.2.2.9 Catch Diode 8.2.2.10 Output Voltage Limitations 8.2.2.11 Power Dissipation Estimate 8.2.3 Application Curves 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.2 Layout Example 10.3 Estimated Circuit Area 10.4 Electromagnetic Interference (EMI) Considerations 11 Device and Documentation Support 11.1 Device Support 11.1.1 Development Support 11.2 Trademarks 11.3 Electrostatic Discharge Caution 11.4 Glossary 12 Mechanical, Packaging, and Orderable Information