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NX2154

Description
300kHz SYNCHRONOUS PWM CONTROLLER
File Size530KB,17 Pages
ManufacturerMicrosemi
Websitehttps://www.microsemi.com
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NX2154 Overview

300kHz SYNCHRONOUS PWM CONTROLLER

Evaluation board available.
NX2154/2154A
300kHz SYNCHRONOUS PWM CONTROLLER
PRELIMINARY DATA SHEET
Pb Free Product
DESCRIPTION
The NX2154/2154A controller IC is a synchronous Buck
controller IC designed for step down DC to DC con-
verter applications. It is optimized to convert bus volt-
ages from 2V to 40V to outputs as low as 0.8V voltage.
The NX2154/2154A operates at fixed 300kHz. The
NX2154/2154A employs fixed loss-less current limiting
by sensing the Rdson of synchronous MOSFET followed
by hiccup feature.NX2154A has higher current limit
threshold than NX2154. Feedback under voltage also
triggers hiccup.
Other features of the device are: 5V gate drive, Adaptive
deadband control, Internal digital soft start, Vcc
undervoltage lock out and shutdown capability via the
comp pin.
FEATURES
n
n
n
n
n
n
Bus voltage operation from 2V to 40V
Fixed 300kHz voltage mode controller
Internal Digital Soft Start Function
Prebias Startup
Less than 50 nS adaptive deadband
Current limit triggers hiccup by sensing Rdson of
Synchronous MOSFET
n
No negative spike at Vout during startup and
shutdown
n
Pb-free and RoHS compliant
APPLICATIONS
n
n
n
n
n
Graphic Card on board converters
Memory Vddq Supply in mother board applications
On board DC to DC such as
5V to 3.3V, 2.5V or 1.8V
Hard Disk Drive
Set Top Box
TYPICAL APPLICATION
Vin
+5V
MBR0530T1
1uF
50ME180WX
Vin
+33V
1uF
5
1
Vcc
7
BST
0.1uF
2
M1A STM6920
15uH
HI=SD
M3
12nF
82pF
13.3k
6
NX2154
Comp
Hdrv
SW
Ldrv
8
M1B
Vout
+5V,3A
6ME1000WG(1000uF,30mohm)
Fb
Gnd
3
4
1k
191
Figure1 - Typical application of 2154
ORDERING INFORMATION
Device
NX2154CSTR
NX2154ACSTR
Rev.1.2
02/26/07
Temperature
0 to 70
o
C
0 to 70
o
C
Package
SOIC-8L
SOIC-8L
Frequency
300kHz
300kHz
OCP Threshold
360mV
540mV
Pb-Free
Yes
Yes
1

NX2154 Related Products

NX2154 NX2154ACSTR NX2154A NX2154CSTR
Description 300kHz SYNCHRONOUS PWM CONTROLLER 300kHz SYNCHRONOUS PWM CONTROLLER 300kHz SYNCHRONOUS PWM CONTROLLER 300kHz SYNCHRONOUS PWM CONTROLLER
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