LM25119 - 42V 宽输入电压双路同步降压控制器

LM25119是TI德州仪器公司的一款控制器（外部开关）产品，LM25119是42V 宽输入电压双路同步降压控制器，本站介绍了LM25119的封装应用图解、特点和优点、功能等，并给出了与LM25119相关的TI元器件型号供参考。

LM25119 - 42V 宽输入电压双路同步降压控制器 - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The LM25119 is a dual 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 switching frequency is programmable from 50kHz to 750kHz. The LM25119 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 high voltage bias regulator with automatic switch-over to external bias further improves efficiency. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line under-voltage lockout. The device is available in a power enhanced leadless LLP-32 package featuring an exposed die attach pad to aid thermal dissipation.

产品特性

Emulated peak current mode control

Wide operating range from 4.5V to 42V

Easily configurable for dual outputs or interleaved single output

Robust 3.3A peak gate drive

Switching frequency programmable to 750kHz

Optional diode emulation mode

Programmable output from 0.8V

Precision 1.5% voltage reference

Programmable current limit

Hiccup mode overload protection

Programmable soft-start

Programmable line under-voltage lockout

Automatic switch-over to external bias supply

Channel2 enable logic input

Thermal Shutdown

Leadless LLP32 (5mm x 5mm) package

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