SNVS104F
June 1999 – May 2020
LM2574
,
LM2574HV
PRODUCTION DATA.
1
Features
2
Applications
3
Description
Device Images
Typical Application (Fixed Output Voltage Versions)
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 for All Output Voltage Versions
6.6
Electrical Characteristics – 3.3-V Version
6.7
Electrical Characteristics – 5-V Version
6.8
Electrical Characteristics – 12-V Version
6.9
Electrical Characteristics – 15-V Version
6.10
Electrical Characteristics – Adjustable Version
6.11
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Current Limit
7.3.2
Undervoltage Lockout
7.3.3
Delayed Start-up
7.3.4
Adjustable Output, Low-Ripple Power Supply
7.4
Device Functional Modes
7.4.1
Shutdown Mode
7.4.2
Active Mode
8
Application and Implementation
8.1
Application Information
8.1.1
Input Capacitor (CIN)
8.1.2
Inductor Selection
8.1.3
Inductor Ripple Current
8.1.4
Output Capacitor
8.1.5
Catch Diode
8.1.6
Output Voltage Ripple and Transients
8.1.7
Feedback Connection
8.1.8
ON/OFF Input
8.1.9
Additional Applications
8.1.9.1
Inverting Regulator
8.1.9.2
Negative Boost Regulator
8.2
Typical Applications
8.2.1
Fixed Output Voltage Applications
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
Inductor Selection (L1)
8.2.1.2.3
Output Capacitor Selection (COUT)
8.2.1.2.4
Catch Diode Selection (D1)
8.2.1.2.5
Input Capacitor (CIN)
8.2.2
Application Curves
8.2.3
Adjustable Output Voltage Applications
8.2.3.1
Design Requirements
8.2.3.2
Detailed Design Procedure
8.2.3.2.1
Programming Output Voltage
8.2.3.2.2
Inductor Selection (L1)
8.2.3.2.3
Output Capacitor Selection (COUT)
8.2.3.2.4
Catch Diode Selection (D1)
8.2.3.2.5
Input Capacitor (CIN)
8.2.3.3
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
10.3
Grounding
10.4
Thermal Considerations
11
Device and Documentation Support
11.1
Device Support
11.1.1
Third-Party Products Disclaimer
11.1.2
Custom Design With WEBENCH® Tools
11.1.3
Device Nomenclature
11.1.3.1
Buck Regulator
11.1.3.2
Buck-Boost Regulator
11.1.3.3
Duty Cycle (D)
11.1.3.4
Catch Diode or Current Steering Diode
11.1.3.5
Capacitor Equivalent Series Resistance (ESR)
11.1.3.6
Equivalent Series Inductance (ESL)
11.1.3.7
Output Ripple Voltage
11.1.3.8
Capacitor Ripple Current
11.1.3.9
Standby Quiescent Current (ISTBY)
11.1.3.10
Inductor Ripple Current (ΔiIND)
11.1.3.11
Continuous and Discontinuous Mode Operation
11.1.3.12
Inductor Saturation
11.1.3.13
Operating Volt Microsecond Constant (E × Top)
11.2
Documentation Support
11.2.1
Related Documentation
11.3
Receiving Notification of Documentation Updates
11.4
Support Resources
11.5
Trademarks
11.6
Electrostatic Discharge Caution
11.7
Glossary
12
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
NPA|14
MPDS386
P|8
MPDI001B
Thermal pad, mechanical data (Package|Pins)
Orderable Information
snvs104f_oa
snvs104f_pm