LM25116 - 42V 宽输入电压同步降压控制器

LM25116是TI德州仪器公司的一款控制器（外部开关）产品，LM25116是42V 宽输入电压同步降压控制器，本站介绍了LM25116的封装应用图解、特点和优点、功能等，并给出了与LM25116相关的TI元器件型号供参考。

LM25116 - 42V 宽输入电压同步降压控制器 - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The LM25116 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. The operating frequency is programmable from 50 kHz to 1 MHz. The LM25116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current. Additional features include a high voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle by cycle current limit and adjustable line under-voltage lockout. The device is available in a power enhanced HTSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.

产品特性

Emulated peak current mode
Wide operating range up to 42V
Low IQ shutdown (< 10 µA)
Drives standard or logic level MOSFETs
Robust 3.5A peak gate drive
Free-run or synchronous operation to 1 MHz
Optional diode emulation mode
Programmable output from 1.215V to 36V
Precision 1.5% voltage reference
Programmable current limit
Programmable soft-start
Programmable line under-voltage lockout
Automatic switch to external bias supply
HTSSOP-20 exposed pad
Thermal shutdown

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