Microchip NX9548 Handleiding

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4.5 V to 24A Adaptive Constant On V, 8

Time (COT) Synchronous Buck Regulator

Features

Adaptive COT Control

Adjustable, Constant Switching Frequency

up to 1 MHz

Extremely Low--MOSFETs RDSON N

Bus Voltage 4.5 V to 24 V



Selectable Diode Emulation Mode (PSM

Mode)

 Current Limit, UVLO, OVP

Gate Resistor Provision for EMI Reduction

-40°C to +85°C Ambient Temperature

-40°C to +150°C Junction Temperature

RoHS Compliant

5×5 mm Very Thin Profile QFN (VQFN)

Package

Applications

Ultramobile/Notebook PCs

Tablets/Slates

-Handheld Portable Instruments

ADSL Modem

Description

The NX9548 is a synchronous buck switching regulator

with 21 mΩ internal N-

channel MOSFETs, primarily

intended for portable (mobile) applications. The

NX9548 operates from 4.5V to 24V, and the output

voltage range is from 0.75V, with output currents V to 5

as high as 8

A. It can be selected to operate in

synchronous mode, or non-

synchronous (diode

emulation or PSM) mode at light loads, to improve

efficiency.

Adaptive constant on time (COT) control provides

extremely fast transient response to line and load steps,

while at the same time providing near-constant

switching

frequency over a wide input voltage range.

The frequency is also externally adjustable.

The NX9548 features overcurrent protection (OCP),

feedback under-

voltage lockout (FB UVLO), and

overvoltage protection (OVP). It also includes an

integrated bootstrapSchottky diode, and provides low -

voltage (5 -V) gate

drive capability. In addition it

provides a Power Good indicator and has adaptive dead

time.

NX9548

July 2015 Rev. 1.2 www.microsemi.com1

© 2015 Microsemi Corporation

Product specificaties