LM25119Q - 汽车类宽输入范围双路同步降压控制器

LM25119Q是TI德州仪器公司的一款控制器（外部开关）产品，LM25119Q是汽车类宽输入范围双路同步降压控制器，本站介绍了LM25119Q的封装应用图解、特点和优点、功能等，并给出了与LM25119Q相关的TI元器件型号供参考。

LM25119Q - 汽车类宽输入范围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 50 kHz to 750 kHz. 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 WQFN-32 package featuring an exposed die attach pad to aid thermal dissipation.

产品特性

LM25119Q is an Automotive Grade product that is AEC-Q100 grade 1 qualified (–40°C to 125°C operating junction temperature).
Emulated peak current mode control
Wide operating range from 4.5 V to 42 V
Easily configurable for dual outputs or interleaved single output
Robust 3.3 A peak gate drive
Switching frequency programmable to 750 kHz
Optional diode emulation mode
Programmable output from 0.8 V
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

Leadless WQFN-32 (5 mm × 5 mm) package

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