SLUS670C
JULY 2005 – January 2015
PRODUCTION DATA.
1
Features
2
Applications
3
Description
4
Revision History
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
Recommended Operating Conditions
6.3
Thermal Information
6.4
Electrical Characteristics
6.5
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
PWM Operation
7.3.2
Adaptive On-Time Control
7.3.3
Light Load Operation
7.3.4
Forced PWM Operation
7.3.5
5-V, 100-mA, LDO and Switchover (VREG5)
7.3.6
3.3-V, 100-mA, LDO and Switchover (VREG3)
7.3.7
2-V, 50-uA Sink - Source Reference (VREF2)
7.3.8
Low-Side Driver
7.3.9
High-Side Driver
7.3.10
Soft-Start
7.3.11
Soft-Stop
7.3.12
Powergood
7.3.13
Current Sensing and Overcurrent Protection
7.3.14
Overvoltage Protection
7.3.15
Undervoltage Protection
7.3.16
5-V Supply and UVLO Protection
7.3.17
VIN Line Sag Protection (Dynamic UVP)
7.3.18
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
Current Mode
7.4.1.1
Current Mode Operation
7.4.2
D-Cap Mode
7.4.2.1
D-Cap Mode Operation
7.5
Programming
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Trademarks
11.2
Electrostatic Discharge Caution
11.3
Glossary
12
Mechanical, Packaging, and Orderable Information
9 Power Supply Recommendations
The TPS51120 is designed to operate from input supply voltage in the range of 4.5 V to 28 V. Make sure power supply voltage in this range.