Datasheet TPS54332 (Texas Instruments) - 6

TPS54332
SLVS875C – JANUARY 2009 – REVISED NOVEMBER 2014
www.ti.com 6.5 Electrical Characteristics
TJ = –40°C to 150°C, VIN = 3.5 V to 28 V (unless otherwise noted)
DESCRIPTION TEST CONDITIONS MIN TYP MAX UNIT SUPPLY VOLTAGE (VIN PIN)
Internal undervoltage lockout threshold Rising and Falling 3.5 V Shutdown supply current EN = 0 V, VIN = 12 V, –40°C to 85°C 1 4 μA Operating – non switching supply current VSENSE = 0.85 V 82 120 μA
ENABLE AND UVLO (EN PIN)
Enable threshold Rising and Falling 1.25 1.35 V Input current Enable threshold – 50 mV -1 μA Input current Enable threshold + 50 mV -4 μA
VOLTAGE REFERENCE
Voltage reference 0.772 0.8 0.828 V
HIGH-SIDE MOSFET
BOOT-PH = 3 V, VIN = 3.5 V 115 200 On resistance mΩ BOOT-PH = 6 V, VIN = 12 V 80 150
ERROR AMPLIFIER
Error amplifier transconductance (gm) –2 μA < ICOMP < 2 μA, V(COMP) = 1 V 92 μmhos Error amplifier DC gain(1) VSENSE = 0.8 V 800 V/V Error amplifier unity gain bandwidth(1) 5 pF capacitance from COMP to GND pins 2.7 MHz Error amplifier source/sink current V(COMP) = 1.0 V, 100-mV overdrive ±7 μA Switch current to COMP transconductance VIN = 12 V 12 A/V
PULSE-SKIPPING ECO-MODE
Pulse-skipping Eco-Mode switch current threshold 160 mA
CURRENT LIMIT
Current limit threshold VIN = 12 V 4.2 6.5 A
THERMAL SHUTDOWN
Thermal Shutdown 165 °C
SLOW-START (SS PIN)
Charge current V(SS) = 0.4 V 2 μA SS to VSENSE matching V(SS) = 0.4 V 10 mV (1) Specified by design
6.6 Switching Characteristics PARAMETERS TEST CONDITIONS MIN TYP MAX UNIT
TPS54332 Switching Frequency VIN = 12 V, 25°C 800 1000 1200 kHz Minimum controllable on time VIN = 12 V, 25°C 110 135 ns Maximum controllable duty ratio(1) BOOT-PH = 6 V 90% 93% (1) Specified by design 6 Submit Documentation Feedback Copyright © 2009–2014, Texas Instruments Incorporated Product Folder Links: TPS54332 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