SNVSB35C
May 2018 – November 2024
PRODUCTION DATA
1
1
Features
2
Applications
3
Description
4
Pin Configuration and Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Electrical Characteristics Per Buck
5.6
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Soft Start
6.3.2
Power Good
6.3.3
Precision Enable
6.4
Device Functional Modes
6.4.1
Output Overvoltage Protection
6.4.2
Undervoltage Lockout
6.4.3
Current Limit
6.4.4
Thermal Shutdown
7
Application and Implementation
7.1
Application Information
7.1.1
Programming Output Voltage
7.1.2
VINC Filtering Components
7.1.3
Using Precision Enable and Power Good
7.1.4
Overcurrent Protection for HTSSOP-20 Package
7.1.5
Current Limit and Short-Circuit Protection for WQFN-16 Package
7.2
Typical Applications
7.2.1
2.2-MHz, 0.8-V Typical High-Efficiency Application Circuit
7.2.1.1
Design Requirements
7.2.1.2
Detailed Design Procedure
7.2.1.2.1
Custom Design With WEBENCH® Tools
7.2.1.2.2
Inductor Selection
7.2.1.2.3
Input Capacitor Selection
7.2.1.2.4
Output Capacitor
7.2.1.2.5
Calculating Efficiency and Junction Temperature
7.2.1.3
Application Curves
7.2.2
2.2-MHz, 1.8-V Typical High-Efficiency Application Circuit
7.2.2.1
Design Requirements
7.2.2.2
Detailed Design Procedure
7.2.2.3
Application Curves
7.2.3
LM26420-Q12.2-MHz, 2.5-V Typical High-Efficiency Application Circuit
7.2.3.1
Design Requirements
7.2.3.2
Detailed Design Procedure
7.2.3.3
Application Curves
7.3
Power Supply Recommendations
7.3.1
Power Supply Recommendations - HTSSOP-20 Package
7.3.2
Power Supply Recommendations - WQFN-16 Package
7.4
Layout
7.4.1
Layout Guidelines
7.4.2
Layout Example
7.4.3
Thermal Considerations
7.4.3.1
Method 1: Silicon Junction Temperature Determination
7.4.3.2
Thermal Shutdown Temperature Determination
8
Device and Documentation Support
8.1
Device Support
8.1.1
Third-Party Products Disclaimer
8.1.2
Custom Design With WEBENCH® Tools
8.2
Documentation Support
8.2.1
Related Documentation
8.3
Receiving Notification of Documentation Updates
8.4
Support Resources
8.5
Trademarks
8.6
Electrostatic Discharge Caution
8.7
Glossary
9
Revision History
10
Mechanical, Packaging, and Orderable Information
1
Features
Qualified for automotive applications
AEC Q100-qualified with the following results:
Device temperature grade 0 (Q0): –40°C to +150°C ambient operating temperature
Device temperature grade 1 (Q1): –40°C to +125°C ambient operating temperature
Functional Safety-Capable
Documentation available to aid functional safety system design
Compliant with CISPR25 class 5 conducted emissions
Input voltage range of 3V to 5.5V
Output voltage range of 0.8V to 4.5V
2A output current per regulator
Fixed 2.2MHz switching frequency
0.8V, 1.5% Internal voltage reference
Internal soft start
Independent power good and precision enable for each output
Current mode, PWM operation
Thermal shutdown
Overvoltage protection
Start-up into prebiased output loads
Regulators are 180° out of phase
Create a custom design using the LM26420-Q1 with the
WEBENCH®
Power Designer