SNVSA03E
October 2014 – October 2018
LM5160
,
LM5160A
PRODUCTION DATA.
1
Features
2
Applications
3
Description
Device Images
Typical Synchronous Buck Application Circuit
Typical Fly-Buck Application Circuit
4
Revision History
5
Pin Configuration and Functions
Pin 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
Switching Characteristics
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Control Circuit
7.3.2
VCC Regulator
7.3.3
Regulation Comparator
7.3.4
Soft Start
7.3.5
Error Amplifier
7.3.6
On-Time Generator
7.3.7
Current Limit
7.3.8
N-Channel Buck Switch and Driver
7.3.9
Synchronous Rectifier
7.3.10
Enable / Undervoltage Lockout (EN/UVLO)
7.3.11
Thermal Protection
7.4
Device Functional Modes
7.4.1
Forced Pulse Width Modulation (FPWM) Mode
7.4.2
Undervoltage Detector
8
Application and Implementation
8.1
Application Information
8.1.1
Ripple Configuration
8.2
Typical Applications
8.2.1
LM5160 Synchronous Buck (10-V to 60-V Input, 5-V Output, 1.5-A Load)
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.2.1
Custom Design With WEBENCH® Tools
8.2.1.2.2
Feedback Resistor Divider - RFB1, RFB2
8.2.1.2.3
Switching Frequency - RON
8.2.1.2.4
Inductor - L
8.2.1.2.5
Output Capacitor - COUT
8.2.1.2.6
Series Ripple Resistor - RESR
8.2.1.2.7
VCC and Bootstrap Capacitors - CVCC, CBST
8.2.1.2.8
Input Capacitor - CIN
8.2.1.2.9
Soft-Start Capacitor - CSS
8.2.1.2.10
EN/UVLO Resistors - RUV1, RUV2
8.2.1.3
Application Curves
8.2.2
LM5160 Isolated Fly-Buck (18-V to 32-V Input, 12-V, 4.5-W Isolated Output)
8.2.2.1
LM5160 Fly-Buck Design Requirements
8.2.2.2
Detailed Design Procedure
8.2.2.2.1
Selection of VOUT1 and Turns Ratio
8.2.2.2.2
Secondary Rectifier Diode
8.2.2.2.3
External Ripple Circuit
8.2.2.2.4
Output Capacitor - COUT2
8.2.2.3
Application Curves
8.2.3
LM5160A Isolated Fly-Buck (18-V to 32-V Input, 12-V, 4.5-W Isolated Output)
8.3
Do's and Don'ts
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Device Support
11.1.1
Third-Party Products Disclaimer
11.1.2
Development Support
11.1.2.1
Custom Design With WEBENCH® Tools
11.2
Documentation Support
11.2.1
Related Documentation
11.3
Related Links
11.4
Receiving Notification of Documentation Updates
11.5
Community Resources
11.6
Trademarks
11.7
Electrostatic Discharge Caution
11.8
Glossary
12
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
DNT|12
MPDS488B
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snvsa03e_oa
snvsa03e_pm
11
Device and Documentation Support