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NX2142ACUTR Datasheet(PDF) 1 Page - Microsemi Corporation

Part # NX2142ACUTR
Description  SINGLE CHANNEL PWM CONTROLLER WITH FEEDFORWARD AND 5V BIAS REGULATOR
PDF  18 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

NX2142ACUTR Datasheet(HTML) 1 Page - Microsemi Corporation

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NX2142/2142A
1
Rev. 1.1
10/28/07
TYPICAL APPLICATION
DESCRIPTION
The NX2142/2142A controller IC is a compact synchro-
nous Buck controller IC with 10 lead MSOP package
designed for step down DC to DC converter applica-
tions with voltage feedforward functionality.
Voltage
feedforward provides fast response, good line regula-
tion and nearly constant power stage gain under wide
voltage input range. The NX2142/2142A controller is
optimized to convert single supply up to 24V bus volt-
age to as low as 0.8V output voltage. NX2142/2142A
can function as a single supply controller with its 5V
bias regulator. Internal UVLO keeps the regulator off
until the supply voltage exceeds 7V where internal digi-
tal soft starts get initiated to ramp up output. The
NX2142/2142A employs fixed current limiting and FB
UVLO followed by hiccup feature. Other features in-
cludes: 5V gate drive capability , Converter Shutdown
by pulling COMP pin to Gnd, Adaptive dead band con-
trol.
n Bus voltage operation from 7V to 24V
n 5V bias regulator available
n Excellent dynamic response with input voltage
feed-forward and voltage mode control
n Fixed 600kHz, 1MHz switching frequency
n
Internal Digital Soft Start Function
n Fixed internal hiccup current limit
n FB UVLO followed by hiccup feature
n Shutdown by pulling COMP pin low
n Pb-free and RoHS compliant
ORDERING INFORMATION
FEATURES
SINGLE CHANNEL PWM CONTROLLER WITH FEEDFORWARD
AND 5V BIAS REGULATOR
APPLICATIONS
n Graphic Card on board converters
n Vddq Supply in mother board applications
n On board DC to DC such as
12V to 3.3V, 2.5V or 1.8V
n Set Top Box and LCD Display
ADVANCE DATA SHEET
Figure1 - Typical application of NX2142
Pb Free Product
COMP
+3.3V /3A
Vout
Gnd
Ldrv
Hdrv
SW
FB
BST
VCC
Vin
+8 to 20V
VIN
REGOUT
1
2
10
4
3
8
9
5
6
7
MMBT3904
BAT54A
1uF
0.1uF
0.1uF
27pF
20k
5.2nF
1000uF,30mohm
DO3316P-682
AO4800(half)
1k
324
AO4800(half)
25TQC33M
1uF
47uF
Device
Temperature
Package
Frequency
Pb-Free
NX2142CUTR
0 to 70o C
MSOP-10L
600kHz
Yes
NX2142ACUTR
0 to 70o C
MSOP-10L
1MHz
Yes


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