Evaluation board available.
NX2114/2114A
300kHz & 600kHz SYNCHRONOUS PWM CONTROLLER
PRELIMINARY DATA SHEET
Pb Free Product
DESCRIPTION
The NX2114 controller IC is a synchronous Buck con-
troller IC designed for step down DC to DC converter
applications. Synchronous control operation replaces
the traditional catch diode with an Nch MOSFET result-
ing in improved converter efficiency. Although the NX2114
controller is optimized to convert single 5V bus voltages
to supplies as low as 0.8V output voltage, however us-
ing a few external components it can also be used for
other input supplies such as 12V input (See NX2113
data sheet for more optimized solution). The NX2114
operates at 300kHz while 2114A is set at 600kHz
operation which together with less than 50 nS of dead
band provides an efficient and cost effective solution.
Other features of the device are:
Internal digital soft start; Vcc undervoltage lock out; Out-
put undervoltage protection with digital filter and shut-
down capability via the enable pin.
Vin
+5V
C4
47uF,70mohm
R5
10
C8
47uF,70mohm
C6
1uF
5
1
D1 MBR0530T1
C5
1uF
M1
L1 1.5uH
Cin
220uF,12mohm
FEATURES
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n
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Synchronous Controller in 8 Pin Package
Bus voltage operation from 2V to 25V
Single 5V Supply Operation
Short protection with feedback UVLO
Internal 300kHz for 2114 and 600kHz for 2114A
Internal Digital Soft Start Function
Shut Down via pulling comp pin low
Pb-free and RoHS compliant
APPLICATIONS
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n
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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
L2 1uH
Vcc
7
OFF R6 10k
ON
2N3904
R7
10k
C1
47pF
C2
1.5nF
R4
22.1k
6
BST
C7
0.1uF
2
NX2114
Comp
Hdrv
SW
Ldrv
8
Fb
Gnd
3
4
M2
Co
2 x (220uF,15mohm)
Vout
+1.6V,6A
R2
10.2k
R1 10.2k
R3
1.5k
C3
2.2nF
Figure1 - Typical application of 2114
ORDERING INFORMATION
Device
NX2114CSTR
NX2114ACSTR
Temperature
0 to 70
o
C
0 to 70
o
C
Package
SOIC-8L
SOIC-8L
Frequency
300kHz
600kHz
Pb-Free
Yes
Yes
Rev. 4.0
06/20/06
1
MICROSEMI [ MICROSEMI CORPORATION ]
