JAJSBH8G
June 2010 – February 2018
TPS65251
PRODUCTION DATA.
1
特長
2
アプリケーション
3
概要
Device Images
代表的なアプリケーションの回路図
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
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Adjustable Switching Frequency
8.3.2
Synchronization
8.3.3
Out-of-Phase Operation
8.3.4
Delayed Start-Up
8.3.5
Soft-Start Time
8.3.6
Adjusting the Output Voltage
8.3.7
Input Capacitor
8.3.8
Bootstrap Capacitor
8.3.9
Error Amplifier
8.3.10
Loop Compensation
8.3.11
Slope Compensation
8.3.12
Powergood
8.3.13
Current Limit Protection
8.3.14
Overvoltage Transient Protection
8.3.15
Thermal Shutdown
8.4
Device Functional Modes
8.4.1
Low-Power Mode Operation
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
Loop Compensation Circuit
9.2.2.2
Selecting the Switching Frequency
9.2.2.3
Output Inductor Selection
9.2.2.4
Output Capacitor
9.2.2.5
Input Capacitor
9.2.2.6
Soft-Start Capacitor
9.2.2.7
Bootstrap Capacitor Selection
9.2.2.8
Adjustable Current Limiting Resistor Selection
9.2.2.9
Output Voltage and Feedback Resistors Selection
9.2.2.10
Compensation
9.2.2.11
3.3-V and 6.5-V LDO Regulators
9.2.3
Application Curves
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.2
Layout Example
11.3
Power Dissipation
12
デバイスおよびドキュメントのサポート
12.1
ドキュメントの更新通知を受け取る方法
12.2
コミュニティ・リソース
12.3
商標
12.4
静電気放電に関する注意事項
12.5
Glossary
13
メカニカル、パッケージ、および注文情報
9.2.3
Application Curves
Figure 23.
BUCK1 Start-Up
L
O
= 4.7 µH, C
O
= 22 µF, V
OUT
= 3.3 V, 2 A
Figure 25.
BUCK1 Transient Load Response
L
O
= 4.7 µH, C
O
= 22 µF, V
OUT
= 3.3 V, ∆I = 1 A to 1.5 A, 100 mV/div
Figure 27.
BUCK2 Start-Up
L
O
= 4.7 µH, C
O
= 22 µF, V
OUT
= 2.5 V, 1.5 A
Figure 29.
BUCK2 Transient Load Response
L
O
= 4.7 µH, C
O
= 22 µF, V
OUT
= 2.5 V, ∆I = 1 A to 1.5 A
Figure 31.
BUCK3 Start-Up
V
OUT
= 7.5 V, 0.7 A
Figure 33.
BUCK3 Transient Load Response
L
O
= 4.7 µH, C
O
= 22 µF, V
OUT
= 7.5 V, ∆I = 1 A to 1.5 A
Figure 24.
BUCK1 Ripple
V
OUT
= 3.3 V, 1.5 A, f
SW
= 800 kHz, 20 mV/div
Figure 26.
BUCK1 Transient Supply Response
L
O
= 4.7 µH, C
O
= 22 µF, V
OUT
= 3.3 V, ∆V
IN
= 8 V to 16.5 V, 20 mV/div
Figure 28.
BUCK2 Ripple
V
OUT
= 2.5 V, 1.5 A, f
SW
= 800 kHz, 10 mV/div
Figure 30.
BUCK2 Transient Supply Response
L
O
= 4.7 µH, C
O
= 22 µF, V
OUT
= 2.5 V, ∆V
IN
= 9 V to 8 V
Figure 32.
BUCK3 Ripple
V
OUT
= 7.5 V, 0.5 A, f
SW
= 800 kHz 10 mV/div
Figure 34.
BUCK3 Transient Supply Response
V
OUT
= 2.5 V, ∆V
IN
= 9 V to 8 V