JAJS474F
November 2010 – May 2019
TPS54618
PRODUCTION DATA.
1
特長
2
アプリケーション
3
概要
Device Images
概略回路図
効率と出力電流との関係
4
改訂履歴
5
概要(続き)
6
Pin Configuration and Functions
Pin Functions
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Timing Requirements
7.7
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Fixed Frequency PWM Control
8.3.2
Slope Compensation and Output Current
8.3.3
Bootstrap Voltage (Boot) and Low Dropout Operation
8.3.4
Error Amplifier
8.3.5
Voltage Reference
8.3.6
Adjusting the Output Voltage
8.3.7
Enable and Adjusting Undervoltage Lockout
8.3.8
Soft-Start Pin
8.3.9
Sequencing
8.3.10
Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
8.3.11
Overcurrent Protection
8.3.12
Frequency Shift
8.3.13
Reverse Overcurrent Protection
8.3.14
Synchronize Using the RT/CLK Pin
8.3.15
Power Good (PWRGD Pin)
8.3.16
Overvoltage Transient Protection
8.3.17
Thermal Shutdown
8.4
Device Functional Modes
8.4.1
Simple Small Signal Model for Peak Current Mode Control
8.4.2
Small Signal Model for Frequency Compensation
9
Application and Implementation
9.1
Application Information
9.2
Typical Application
9.2.1
Design Requirements
9.2.2
Detailed Design Procedure
9.2.2.1
Custom Design With WEBENCH® Tools
9.2.2.2
Step One: Select the Switching Frequency
9.2.2.3
Step Two: Select the Output Inductor
9.2.2.4
Step Three: Choose the Output Capacitor
9.2.2.5
Step Four: Select the Input Capacitor
9.2.2.6
Step Five: Choose the Soft-Start Capacitor
9.2.2.7
Step Six: Select the Bootstrap Capacitor
9.2.2.8
Step Eight: Select Output Voltage and Feedback Resistors
9.2.2.8.1
Output Voltage Limitations
9.2.2.9
Step Nine: Select Loop Compensation Components
9.2.3
Application Curves
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.2
Layout Example
11.3
Power Dissipation Estimate
12
デバイスおよびドキュメントのサポート
12.1
デバイス・サポート
12.1.1
開発サポート
12.1.2
WEBENCH®ツールによるカスタム設計
12.2
ドキュメントの更新通知を受け取る方法
12.3
コミュニティ・リソース
12.4
商標
12.5
静電気放電に関する注意事項
12.6
Glossary
13
メカニカル、パッケージ、および注文情報
パッケージ・オプション
メカニカル・データ(パッケージ|ピン)
RTE|16
MPQF149D
サーマルパッド・メカニカル・データ
RTE|16
QFND290G
発注情報
jajs474f_oa
jajs474f_pm
7.7
Typical Characteristics
Figure 1.
High-Side and Low-Side ON-Resistance
vs Junction Temperature
Figure 3.
High-Side Current Limit vs Junction Temperature
Figure 5.
Switching Frequency vs RT Resistance
Low Frequency Range
Figure 7.
Transconductance vs Junction Temperature
Figure 9.
Enable Pin Voltage vs Junction Temperature
Figure 11.
EN Pin Current vs Junction Temperature
Figure 13.
Input Voltage vs Junction Temperature
Figure 15.
Shutdown Supply Current vs Input Voltage
Figure 17.
Supply Current vs Input Voltage
Figure 19.
PWRGD ON-Resistance
vs Junction Temperature
Figure 21.
Efficiency vs Load Current
Figure 23.
Efficiency vs Load Current
Figure 2.
Switching Frequency vs Junction Temperature
Figure 4.
Voltage Reference vs Junction Temperature
Figure 6.
Switching Frequency vs Vsense
Figure 8.
Transconductance (Soft-Start)
vs Junction Temperature
Figure 10.
EN Pin Current vs Junction Temperature
Figure 12.
Charge Current vs Junction Temperature
Figure 14.
Shutdown Supply Current
vs Junction Temperature
Figure 16.
Supply Current vs Junction Temperature
Figure 18.
PWRGD Threshold vs Junction Temperature
Figure 20.
SS/TR to VSENSE Offset
vs Junction Temperature
Figure 22.
Efficiency vs Load Current
Figure 24.
Efficiency vs Load Current