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NEXSEMNEXSEM
NEXSEM
NEXSEMNEXSEM
SINGLE SUPPL Y 12V SYNCHRONOUS PWM CONTROLLER
NX2306
ADV ANCE DAT A SHEET
DESCRIPTION
The NX2306 controller IC is a compact synchronous Buck
controller IC with 8 lead SOIC8 package designed for
step down DC to DC converter applications. The NX2306
controller is optimized to convert single supply 12V bus
voltage to as low as 0.8V output voltage. Internal UVLO
keeps the regulator off until the supply voltage exceeds
9V where internal digital soft starts get initiated to ramp
up output.The NX2306 employs loss-less current limitÂing by sensing the Rdson of synchronous MOSFET folÂlowed by HICCUP feature. Other features includes: 12V
gate drive capability , Converter Shutdown by pulling
OCP pin to gnd, Adaptive dead band control and internal
compensation to reduce external components.
Vin
+12V
C4
100uF
L2 1uH
D1
FEATURES
12V Gate Driver
Bus voltage operation from 9V to 15V
Loss-Less Current limit by sensing Rdson of
Synchronous MOSFET
Fixed compensation gain
Internal 300kHz or 600kHz operation(2306A)
Internal Digital Soft S tart Function
Adaptive deadband Control
Shut Down via pulling OCP pin
APPLICATIONS
Graphic Card on board converters
Vddq Supply in mother board applications
On board DC to DC such as
12V to 3.3V, 2.5V or 1.8V
Set Top Box and LCD Display
TYPICAL APPLICA TION
C5
1uF
Cin
100uF
C3
1uF
5
Vcc
7
1
BST
Hdrv
SW
OCP
Ldrv
FB
HI=SD
4
6
NX2306
Gnd
3
Figure1 - Typical application of NX2306
C6
0.1uF
6.94k
M1
L1 1.5uH
M2
28.9k
19.3k
2
8
7
R1
M3
Co
4 x 330uF
R2
R3
ORDERING INFORMA TION
Device Temperature Package Frequency
NX2306CSTR 0 to 70oC SOIC-8L 300kHz
NX2306ACSTR 0 to 70oC SOIC-8L 600kHz
Vout
+2V 10A
Rev. 1.0
01/24/05
www.nexsem.com
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