lm25119psqx National Semiconductor Corporation, lm25119psqx Datasheet

lm25119psqx

Manufacturer Part Number

lm25119psqx

Description

Lm25119 Wide Input Range Dual Synchronous Buck Controller

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM25119PSQX.pdf (24 pages)

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Wide Input Range Dual Synchronous Buck Controller

General Description

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 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 LM25119 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.

Typical Application

301262

LM25119

Features

■

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

September 28, 2010

www.national.com

30126201

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