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LM43603-Q1 3.5-V to 36-V, 3-A Synchronous Step-Down Voltage Converter
SNVSA82C
April 2015 – October 2017
LM43603-Q1
PRODUCTION DATA.
CONTENTS
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LM43603-Q1 3.5-V to 36-V, 3-A Synchronous Step-Down Voltage Converter
1
Features
2
Applications
3
Description
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
Timing Requirements
6.7
Switching Characteristics
6.8
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Fixed Frequency Peak Current Mode Controlled Step-Down Regulator
7.3.2
Light Load Operation
7.3.3
Adjustable Output Voltage
7.3.4
Enable (EN)
7.3.5
VCC, UVLO, and BIAS
7.3.6
Soft-Start and Voltage Tracking (SS/TRK)
7.3.7
Switching Frequency (RT) and Synchronization (SYNC)
7.3.8
Minimum ON Time, Minimum OFF Time and Frequency Foldback at Dropout Conditions
7.3.9
Internal Compensation and CFF
7.3.10
Bootstrap Voltage (BOOT)
7.3.11
Power Good (PGOOD)
7.3.12
Overcurrent and Short-Circuit Protection
7.3.13
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
Shutdown Mode
7.4.2
Stand-by Mode
7.4.3
Active Mode
7.4.4
CCM Mode
7.4.5
Light Load Operation
7.4.6
Self-Bias Mode
8
Applications and Implementation
8.1
Application Information
8.2
Typical Applications
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Custom Design With WEBENCH® Tools
8.2.2.2
Output Voltage Setpoint
8.2.2.3
Switching Frequency
8.2.2.4
Input Capacitors
8.2.2.5
Inductor Selection
8.2.2.6
Output Capacitor Selection
8.2.2.7
Feed-Forward Capacitor
8.2.2.8
Bootstrap Capacitors
8.2.2.9
VCC Capacitor
8.2.2.10
BIAS Capacitors
8.2.2.11
Soft-Start Capacitors
8.2.2.12
Undervoltage Lockout Setpoint
8.2.2.13
PGOOD
8.2.3
Application Performance Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.1.1
Compact Layout for EMI Reduction
10.1.2
Ground Plane and Thermal Considerations
10.1.3
Feedback Resistors
10.2
Layout Example
11
Device and Documentation Support
11.1
Device Support
11.1.1
Third-Party Products Disclaimer
11.2
Development Support
11.2.1
Custom Design With WEBENCH® Tools
11.3
Receiving Notification of Documentation Updates
11.4
Community Resources
11.5
Electrostatic Discharge Caution
11.6
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
PWP|16
MPDS371A
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snvsa82c_oa
snvsa82c_pm
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