ZHCSLO5B December 2020 – December 2021 LM25149
PRODUCTION DATA
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 Revision History
- 5 說明（續(xù)）
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Input Voltage Range (VIN)
- 8.3.2 High-Voltage Bias Supply Regulator (VCC, VCCX, VDDA)
- 8.3.3 Precision Enable (EN)
- 8.3.4 Power-Good Monitor (PG)
- 8.3.5 Switching Frequency (RT)
- 8.3.6 Active EMI Filter
- 8.3.7 Dual Random Spread Spectrum (DRSS)
- 8.3.8 Soft Start
- 8.3.9 Output Voltage Setpoint (FB)
- 8.3.10 Minimum Controllable On Time
- 8.3.11 Error Amplifier and PWM Comparator (FB, EXTCOMP)
- 8.3.12 Slope Compensation
- 8.3.13 Inductor Current Sense (ISNS+, VOUT)
- 8.3.14 Hiccup Mode Current Limiting
- 8.3.15 High-Side and Low-Side Gate Drivers (HO, LO)
- 8.3.16 Output Configurations (CNFG)
- 8.3.17 Single-Output Dual-Phase Operation
- 8.4 Device Functional Modes
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Applications
- 9.2.1
Design 1 – High Efficiency 2.1-MHz Synchronous
Buck Regulator
- 9.2.1.1 Design Requirements
- 9.2.1.2
Detailed Design Procedure
- 9.2.1.2.1 Custom Design With WEBENCH? Tools
- 9.2.1.2.2 Custom Design With Excel Quickstart Tool
- 9.2.1.2.3 Buck Inductor
- 9.2.1.2.4 Current-Sense Resistance
- 9.2.1.2.5 Output Capacitors
- 9.2.1.2.6 Input Capacitors
- 9.2.1.2.7 Frequency Set Resistor
- 9.2.1.2.8 Feedback Resistors
- 9.2.1.2.9 Compensation Components
- 9.2.1.2.10 Active EMI Components
- 9.2.1.3 Application Curves
- 9.2.2 Design 2 – High Efficiency 440-kHz Synchronous Buck Regulator
- 9.2.3 Design 3 – Dual-Phase 400-kHz 20-A Synchronous Buck Regulator
- 9.2.1
Design 1 – High Efficiency 2.1-MHz Synchronous
Buck Regulator
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RGY|24
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RGY|24
訂購(gòu)信息
3 說明
LM25149 是一款 42V 超低 IQ 同步降壓直流/直流控制器，適合高電流單輸出應(yīng)用。該控制器使用峰值電流模式控制架構(gòu)，可實(shí)現(xiàn)簡(jiǎn)單環(huán)路補(bǔ)償、快速瞬態(tài)響應(yīng)和出色的負(fù)載和線路調(diào)節(jié)性能。LM25149 可設(shè)置為以交錯(cuò)雙相模式運(yùn)行，實(shí)現(xiàn)精確的電流共享，適合高電流應(yīng)用。它可在低至 3.5V 的 VIN 和接近 100% 的占空比（如果需要）下運(yùn)行。
LM25149 有兩個(gè)獨(dú)特的 EMI 降低特性：有源 EMI 濾波器和雙隨機(jī)展頻 (DRSS)。有源 EMI 濾波器可檢測(cè)直流輸入總線上的任何噪聲或紋波電壓，并注入異相消除信號(hào)以減少干擾。DRSS 將低頻三角調(diào)制與高頻隨機(jī)調(diào)制相結(jié)合，可分別在低頻和高頻頻帶上降低 EMI。此項(xiàng)混合技術(shù)符合業(yè)界通用的 EMC 測(cè)試中指定的多種分辨率帶寬 (RBW) 設(shè)置。
器件信息
| 器件型號(hào) | 封裝(1) | 封裝尺寸（標(biāo)稱值） |
|---|---|---|
| LM25149 | VQFN (24) | 3.5mm × 5.5mm |
(1) 如需了解所有可用封裝，請(qǐng)參閱數(shù)據(jù)表末尾的可訂購(gòu)產(chǎn)品附錄
典型應(yīng)用原理圖
CISPR 25 EMI 性能 150kHz 至 30MHz