Datasheet TPS62902 (Texas Instruments)

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TPS62902
SLVSFM1 – MARCH 2021
TPS62902, 3-V to 17-V, High Efficiency and Low IQ Buck Converter in 1.5-mm × 2-mm QFN Package 1 Features
• Motor drives systems • Power delivery • High efficiency for wide duty cycle and load range • PC and notebooks – IQ: 4 µA typical – Selectable switching frequency of 2.5 MHz and
3 Description
1.0 MHz The TPS62902 is a highly-efficient, small, and flexible – RDS(ON): 62-mΩ high side, 22-mΩ low side synchronous step-down DC-DC converter that is easy – Automatic efficiency enhancement (AEE) to use. A selectable switching frequency of 2.5 MHz • Small 1.5-mm × 2.0-mm VQFN package with 0.5- or 1.0 MHz allows the use of small inductors and mm pitch provides fast transient response. The device supports • Up to 2-A continuous output current high VOUT accuracy of ± 1% with DCS-Control topology. The wide input voltage range of 3-V to 17-V • ±0.9% feedback voltage accuracy across temp supports a variety of nominal inputs, like 12-V supply (-40°C to 150°C) rails, single-cell or multi-cell Li-Ion, and 5-V or 3.3-V • Configurable ouput voltage options: rails. – VFB external divider: 0.6 V to 5.5 V – V The TPS62902 can automatically enter power save SET internal divider: 16 options between 0.4 V and 5.5 V mode (if auto PFM/PWM is selected) at light loads to maintain high efficiency. Additionally, to provide high • DCS-Control™ topology with 100% mode efficiency at very small loads, the device has a low • Highly flexible and easy to use typical quiescent current of 4 µA. AEE, if enabled, – Optimized pinout for single-layer routing provides high efficiency across VIN, VOUT, and – Precise enable input load current. The device includes a S-CONF/MODE – Forced PWM or auto power save mode input to set the internal/external divider, switching – Power good output frequency, output voltage discharge, and automatic – Selectable active output discharge power save mode or forced PWM operation. – Adjustable soft start and tracking The device is available in small 9-pin VQFN package • No external bootstrap capacitor required measuring 1.50 mm × 2.00 mm with 0.5-mm pitch. • Create a custom design using the TPS62902 using
Device Information
the WEBENCH® Power Designer
PART NUMBER PACKAGE(1) BODY SIZE (NOM) 2 Applications
TPS62902 VQFN-HR 1.50 mm × 2.00 mm • Factory automation and control (1) For all available packages, see the orderable addendum at • Building automation the end of the data sheet. • Data center and enterprise computing VIN VOUT 100 TPS6290x 1µH 3V t 17V 0.6V t 5.5V 90 VIN SW 80 22 10 …F …F 70 EN VOS (%) 60 FB/ 50 SS/TR VSET iency fic 40 Ef VIN=3V MODE/ PG 30 VIN=5V S-CONF VIN=8V 20 GND VIN=10V 10 VIN=12V VIN=15V 0 1E-5 0.0001 0.001 0.01 0.1 0.2 0.5 1 2
Simplified Schematic
IOUT (A)
Efficiency Versus Output Current (1.2-VO at 2.5 MHz-1 μH, Auto PFM/PWM)
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 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 Mode Selection and Device Configuration MODE/S-CONF 7.3.2 Adjustable VO Operation (External Voltage Divider) 7.3.3 Setable VO Operation (VSET and Internal Voltage Divider) 7.3.4 Soft Start / Tracking (SS/TR) 7.3.5 Smart Enable with Precise Threshold 7.3.6 Power Good (PG) 7.3.7 Undervoltage Lockout (UVLO) 7.3.8 Current Limit And Short Circuit Protection 7.3.9 Thermal Shutdown 7.4 Device Functional Modes 7.4.1 Pulse Width Modulation (PWM) Operation 7.4.2 AEE (Automatic Efficiency Enhancement) 7.4.3 Power Save Mode Operation (Auto PFM/PWM) 7.4.4 100% Duty-Cycle Operation 7.4.5 Output Discharge Function 7.4.6 Starting into a Pre-Biased Load 8 Application and Implementation 8.1 Application Information 8.2 Typical Application with Adjustable Output Voltage 8.2.1 Design Requirements 8.2.2 Detailed Design Procedure 8.2.2.1 Custom Design With WEBENCH® Tools 8.2.2.2 Programming the Output Voltage 8.2.2.3 External Component Selection 8.2.2.4 Inductor Selection 8.2.2.5 Capacitor Selection 8.2.2.5.1 Output Capacitor 8.2.2.5.2 Input Capacitor 8.2.2.5.3 Soft-Start Capacitor 8.2.2.6 Tracking Function 8.2.2.7 Output Filter and Loop Stability 8.2.3 Application Curves 8.2.4 Typical Application with Setable VO using VSET 8.2.4.1 Design Requirements 8.2.4.2 Detailed Design Procedure 8.2.4.3 Application Curves 8.3 System Examples 8.3.1 LED Power Supply 8.3.2 Powering Multiple Loads 8.3.3 Voltage Tracking 8.3.4 Precise Soft-Start Timing 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.2 Layout Example 10.2.1 Thermal Considerations 11 Device and Documentation Support 11.1 Device Support 11.1.1 Development Support 11.1.1.1 Custom Design With WEBENCH® Tools 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