ZHCSM29A September 2023 – June 2024 LM70840-Q1 , LM70860-Q1 , LM70880-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 說明（續）
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Input Voltage Range (VIN)
- 7.3.2 High-Voltage Bias Supply Regulator (VCC, BIAS, VDDA)
- 7.3.3 Enable (EN)
- 7.3.4 Power-Good Monitor (PG)
- 7.3.5 Switching Frequency (RT)
- 7.3.6 Dual Random Spread Spectrum (DRSS)
- 7.3.7 Soft Start
- 7.3.8 Output Voltage Setpoint (FB)
- 7.3.9 Minimum Controllable On-Time
- 7.3.10 Error Amplifier and PWM Comparator (FB, EXTCOMP)
- 7.3.11 Slope Compensation
- 7.3.12 Shunt Current Sensing
- 7.3.13 Hiccup Mode Current Limiting
- 7.3.14 Device Configuration (CONFIG)
- 7.3.15 Single-Output Dual-phase Operation
- 7.3.16 Pulse Frequency Modulation (PFM) / Synchronization
- 7.3.17 Thermal Shutdown (TSD)
- 7.4 Device Functional Modes
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1
Design 1 – High Efficiency, Wide Input, 400-kHz Synchronous
Buck Regulator
- 8.2.1.1 Design Requirements
- 8.2.1.2
Detailed Design Procedure
- 8.2.1.2.1 Custom Design With WEBENCH? Tools
- 8.2.1.2.2 Custom Design With Excel Quickstart Tool
- 8.2.1.2.3 Buck Inductor
- 8.2.1.2.4 Current-Sense Resistance
- 8.2.1.2.5 Output Capacitors
- 8.2.1.2.6 Input Capacitors
- 8.2.1.2.7 Frequency Set Resistor
- 8.2.1.2.8 Feedback Resistors
- 8.2.1.2.9 Compensation Components
- 8.2.1.3 Application Curves
- 8.2.2 Design 2 – High Efficiency 48V to 12V 400kHz Synchronous Buck Regulator
- 8.2.1
Design 1 – High Efficiency, Wide Input, 400-kHz Synchronous
Buck Regulator
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
3 說明
LM708x0-Q1 是低 IQ、寬 VIN 同步降壓轉換器系列，專為 4.5V 至 80V 輸入電壓范圍設計，在提供高達 8A 輸出電流的同時具有 3.3V/5V/12V 固定輸出電壓或可調輸出電壓。
LM708x0-Q1 使用峰值電流模式控制架構，可實現簡單環路補償、快速瞬態響應和出色的負載和線路調節性能。一對 LM708x0-Q1 轉換器可設置為以交錯模式（并聯輸出）運行，可實現精確的電流共享，適用于需要高達 16A 輸出電流的應用。
LM708x0-Q1 具有獨特的雙隨機展頻 (DRSS) 功能，能夠將低頻三角調制與高頻逐周期隨機調制相結合，在廣泛的頻帶上提高 EMI 性能。
(1) 有關更多信息，請參閱Mechanical, Packaging, and Orderable Information。
(2) 封裝尺寸（長 × 寬）為標稱值，并包括引腳（如適用）。
典型應用電路
典型效率，VOUT = 12V，fSW = 400kHz