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LM5118 Wide Voltage Range Buck-Boost Controller
SNVS566J
April 2008 – June 2017
LM5118
PRODUCTION DATA.
CONTENTS
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LM5118 Wide Voltage Range Buck-Boost Controller
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
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
UVLO
7.3.2
Oscillator and Sync Capability
7.3.3
Error Amplifier and PWM Comparator
7.3.4
Ramp Generator
7.3.5
Current Limit
7.3.6
Maximum Duty Cycle
7.3.7
Soft Start
7.3.8
HO Output
7.3.9
Thermal Protection
7.4
Device Functional Modes
7.4.1
Buck Mode Operation: VIN > VOUT
7.4.2
Buck-Boost Mode Operation: VIN ≊ VOUT
7.4.3
High Voltage Start-Up Regulator
7.4.4
Enable
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
Custom Design With WEBENCH® Tools
8.2.2.2
R7 = RT
8.2.2.3
Inductor Selection, L1
8.2.2.4
R13 = RSENSE
8.2.2.5
C15 = CRAMP
8.2.2.6
Inductor Current Limit Calculation
8.2.2.7
C9 - C12 = Output Capacitors
8.2.2.8
D1
8.2.2.9
D4
8.2.2.10
C1 - C5 = Input Capacitor
8.2.2.11
C20
8.2.2.12
C8
8.2.2.13
C16 = CSS
8.2.2.14
R8, R9
8.2.2.15
R1, R3, C21
8.2.2.16
R2
8.2.2.17
Snubber
8.2.2.18
Error Amplifier Configuration
8.2.2.18.1
R4, C18, C17
8.2.3
Application Curves
9
Power Supply Recommendations
9.1
Thermal Considerations
9.2
Bias Power Dissipation Reduction
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
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
Trademarks
11.3
Electrostatic Discharge Caution
11.4
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
PWP|20
MHTS001H
Thermal pad, mechanical data (Package|Pins)
PWP|20
PPTD289A
Orderable Information
snvs566j_oa
snvs566j_pm
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