LM5119PSQE datasheet(1/24 Pages) NSC

Part #	LM5119PSQE

Description	Wide Input Range Dual Synchronous Buck Controller

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Manufacturer	NSC [National Semiconductor (TI)]

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LM5119

September 28, 2010

Wide Input Range Dual Synchronous Buck Controller

General Description

The LM5119 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 up-

on current mode control utilizing an emulated current ramp.

Current mode control provides inherent line feed-forward, cy-

cle-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 ap-

plications. The switching frequency is programmable from

50kHz to 750kHz. The LM5119 drives external high-side and

low-side NMOS power switches with adaptive dead-time con-

trol. A user-selectable diode emulation mode enables discon-

tinuous mode operation for improved efficiency at light load

conditions. A high voltage bias regulator with automatic

switch-over to external bias further improves efficiency. Ad-

ditional features include thermal shutdown, frequency syn-

chronization, cycle-by-cycle and hiccup mode current limit

and adjustable line under-voltage lockout. The device is avail-

able in a power enhanced leadless LLP-32 package featuring

an exposed die attach pad to aid thermal dissipation.

Features

■ Emulated peak current mode control

■ Wide operating range from 5.5V to 65V

■ 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

Typical Application

30124001

301240

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