ZHCSIJ1E June 1999 – July 2018 LM2574 , LM2574HV
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and 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
-
8 Application and Implementation
- 8.1 Application Information
- 8.2 Typical Applications
- 9 Power Supply Recommendations
- 10Layout
-
11器件和文檔支持
- 11.1
器件支持
- 11.1.1 第三方產(chǎn)品免責聲明
- 11.1.2 使用 WEBENCH® 工具創(chuàng)建定制設計
- 11.1.3
器件命名規(guī)則
- 11.1.3.1 降壓穩(wěn)壓器
- 11.1.3.2 降壓/升壓穩(wěn)壓器
- 11.1.3.3 占空比 (D)
- 11.1.3.4 環(huán)流二極管或導流二極管
- 11.1.3.5 電容器等效串聯(lián)電阻 (ESR)
- 11.1.3.6 等效串聯(lián)電感 (ESL)
- 11.1.3.7 輸出紋波電壓
- 11.1.3.8 電容器紋波電流
- 11.1.3.9 待機靜態(tài)電流 (ISTBY)
- 11.1.3.10 電感器紋波電流 (ΔiIND)
- 11.1.3.11 連續(xù)與非連續(xù)模式運行
- 11.1.3.12 電感器飽和
- 11.1.3.13 運算伏特微秒常數(shù) (E × Top)
- 11.2 文檔支持
- 11.3 接收文檔更新通知
- 11.4 社區(qū)資源
- 11.5 商標
- 11.6 靜電放電警告
- 11.7 術語表
- 11.1
器件支持
- 12機械、封裝和可訂購信息
封裝選項
機械數(shù)據(jù) (封裝 | 引腳)
散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)
訂購信息
8.1.1 Input Capacitor (CIN)
To maintain stability, the regulator input pin must be bypassed with at least a 22-μF electrolytic capacitor. The leads of the capacitor must be kept short, and located near the regulator.
If the operating temperature range includes temperatures below −25°C, the input capacitor value may need to be larger. With most electrolytic capacitors, the capacitance value decreases and the ESR increases with lower temperatures and age. Paralleling a ceramic or solid tantalum capacitor increases the regulator stability at cold temperatures. For maximum capacitor operating lifetime, the RMS ripple current rating of the capacitor must be greater than Equation 2.
where
for a buck regulator
for a buck-boost regulator