ZHCSGY9B
July 2017 – March 2018
LMS3655
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
典型应用电路
LMS3655 效率:输出电压 = 5V
4
修订历史记录
5
Device Comparison Table
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
Thermal Information (for Device Mounted on PCB)
7.6
Electrical Characteristics
7.7
System Characteristics
7.8
Timing Requirements
7.9
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.2.1
Control Scheme
8.3
Feature Description
8.3.1
RESET Flag Output
8.3.2
Enable and Start-Up
8.3.3
Soft-Start Function
8.3.4
Current Limit
8.3.5
Hiccup Mode
8.3.6
Synchronizing Input
8.3.7
Undervoltage Lockout (UVLO) and Thermal Shutdown (TSD)
8.3.8
Input Supply Current
8.4
Device Functional Modes
8.4.1
AUTO Mode
8.4.2
FPWM Mode
8.4.3
Dropout
8.4.4
Spread-Spectrum Operation
9
Application and Implementation
9.1
Application Information
9.2
Typical Applications
9.2.1
General Application
9.2.1.1
Design Requirements
9.2.1.2
Detailed Design Procedure
9.2.1.2.1
External Components Selection
9.2.1.2.1.1
Input Capacitors
9.2.1.2.1.2
Output Inductors and Capacitors
9.2.1.2.1.2.1
Inductor Selection
9.2.1.2.1.2.2
Output Capacitor Selection
9.2.1.2.2
FB for Adjustable Output
9.2.1.2.3
VCC
9.2.1.2.4
BIAS
9.2.1.2.5
CBOOT
9.2.1.2.6
Maximum Ambient Temperature
9.2.1.3
Application Curves
9.2.2
Adjustable 5-V Output
9.2.2.1
Design Requirements
9.2.2.2
Detailed Design Procedure
9.2.2.3
Application Curves
9.2.3
Adjustable 3.3-V Output
9.2.3.1
Design Requirements
9.2.3.2
Detailed Design Procedure
9.2.3.3
Application Curves
9.2.4
6-V Adjustable Output
9.2.4.1
Design Requirements
9.2.4.2
Detailed Design Procedure
9.2.4.3
Application Curves
9.3
Do's and Don't's
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.2
Layout Example
12
器件和文档支持
12.1
器件支持
12.1.1
第三方产品免责声明
12.2
文档支持
12.2.1
相关文档
12.3
接收文档更新通知
12.4
社区资源
12.5
商标
12.6
静电放电警告
12.7
Glossary
13
机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
RNL|22
MPQF443E
散热焊盘机械数据 (封装 | 引脚)
RNL|22
QFND673
订购信息
zhcsgy9b_oa
1
特性
在将 12V 转换为 5V 时具有 96% 的峰值效率
低 EMI 和开关噪声
最少的开关节点振铃
假随机扩频
400kHz (±10%) 固定开关频率
–40°C 至 +150°C 结温范围
外部频率同步
具有内部滤波器和 3ms 释放计时器的
RESET
输出
可提高效率的自动轻负载模式
引脚可选强制 PWM 模式
内置补偿、软启动、电流限制、热关断和 UVLO
25°C 时在 3.5A 负载下具有 0.35V 压降(典型值)
32µA I
Q_VIN
:在 3.3V
OUT
且无负载情况下的静态电流(典型值)
5.5A 持续负载电流
可调节输出电压(1V 至 20V)
±1.5% 基准电压容差
4mm × 5mm、0.5mm 间距 SON 封装