LM25117数据手册集成电路（IC）的DC-DC开关控制器规格书PDF

描述 Description

The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

特性 Features

• Emulated peak current mode control
• Wide operating range from 4.5V to 42V
• Robust 3.3A peak gate drives
• Adaptive dead-time output driver control
• Free-run or synchronizable clock up to 750kHz
• Optional diode emulation mode
• Programmable output from 0.8V
• Precision 1.5% voltage reference
• Analog current monitor
• Programmable current limit
• Hiccup mode over current protection
• Programmable soft-start and tracking
• Programmable line under-voltage lockout
• Programmable switch-over to external bias supply
• Thermal shutdown
Packages
• TSSOP-20EP (Thermally enhanced)
• LLP-24 (4mmx4mm)