JAJSOR7
September 2024
LM704A0-Q1
PRODUCTION DATA
1
1
特長
2
アプリケーション
3
概要
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
5.6
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Input Voltage Range (VIN)
6.3.2
High-Voltage Bias Supply Regulator (VCC, BIAS, VDDA)
6.3.3
Enable (EN)
6.3.4
Power-Good Monitor (PG)
6.3.5
Switching Frequency (RT)
6.3.6
Dual Random Spread Spectrum (DRSS)
6.3.7
Soft Start
6.3.8
Output Voltage Setpoint (FB)
6.3.9
Minimum Controllable On-Time
6.3.10
Error Amplifier and PWM Comparator (FB, EXTCOMP)
6.3.11
Slope Compensation
6.3.12
Shunt Current Sensing
6.3.13
Hiccup Mode Current Limiting
6.3.14
Device Configuration (CONFIG)
6.3.15
Single-Output Dual-Phase Operation
6.3.16
Pulse Frequency Modulation (PFM) / Synchronization
6.3.17
Thermal Shutdown (TSD)
6.4
Device Functional Modes
6.4.1
Shutdown Mode
6.4.2
Standby Mode
6.4.3
Active Mode
6.4.4
Sleep Mode
7
Application and Implementation
7.1
Application Information
7.1.1
Power Train Components
7.1.1.1
Buck Inductor
7.1.1.2
Output Capacitors
7.1.1.3
Input Capacitors
7.1.1.4
EMI Filter
7.1.2
Error Amplifier and Compensation
7.1.3
Maximum Ambient Temperature
7.1.3.1
Derating Curves
7.2
Typical Applications
7.2.1
Design 1 – High Efficiency, Wide Input, 400kHz Synchronous Buck Regulator
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
Custom Design With Excel Quickstart Tool
7.2.1.2.3
Buck Inductor
7.2.1.2.4
Current-Sense Resistance
7.2.1.2.5
Output Capacitors
7.2.1.2.6
Input Capacitors
7.2.1.2.7
Frequency Set Resistor
7.2.1.2.8
Feedback Resistors
7.2.1.2.9
Compensation Components
7.2.1.3
Application Curves
7.2.2
Design 2 – High Efficiency 24V to 3.3V 400kHz Synchronous Buck Regulator
7.2.2.1
Design Requirements
7.2.2.2
Detailed Design Procedure
7.2.2.3
Application Curves
7.3
Power Supply Recommendations
7.4
Layout
7.4.1
Layout Guidelines
7.4.1.1
Thermal Design and Layout
7.4.2
Layout Example
8
Device and Documentation Support
8.1
Device Support
8.1.1
Development Support
8.1.1.1
Custom Design With WEBENCH® Tools
8.2
Documentation Support
8.2.1
Related Documentation
8.2.1.1
PCB Layout Resources
8.2.1.2
Thermal Design Resources
8.3
ドキュメントの更新通知を受け取る方法
8.4
サポート・リソース
8.5
Trademarks
8.6
静電気放電に関する注意事項
8.7
用語集
9
Revision History
10
Mechanical, Packaging, and Orderable Information
10.1
Tape and Reel Information
8.2.1
Related Documentation
For related documentation see the following:
Application notes:
Texas Instruments,
Improve High-current DC/DC Regulator Performance for Free with Optimized Power Stage Layout
Texas Instruments,
AN-2162 Simple Success with Conducted EMI from DC-DC Converters
Texas Instruments,
Maintaining Output Voltage Regulation During Automotive Cold-Crank with LM5140-Q1 Dual Synchronous Buck Controller
Analog design journal:
Texas Instruments,
Reduce Buck Converter EMI and Voltage Stress by Minimizing Inductive Parasitics
White papers:
Texas Instruments,
An Overview of Conducted EMI Specifications for Power Supplies
Texas Instruments,
An Overview of Radiated EMI Specifications for Power Supplies
Texas Instruments,
Valuing Wide V
IN
, Low EMI Synchronous Buck Circuits for Cost-driven, Demanding Applications