NX2307 Datasheet, PDF (1/22 Pages) Microsemi Corporation – SINGLE SUPPLY 12V SYNCHRONOUS PWM CONTROLLER

NX2307
SINGLE SUPPLY 12V SYNCHRONOUS PWM CONTROLLER
ADVANCE DATA SHEET
Pb Free Product
DESCRIPTION
FEATURES
The NX2307 controller IC is a compact synchronous Buck
controller IC with 8 lead SOIC8 package designed for
step down DC to DC converter applications. The NX2307
n
n
n
12V Gate Driver
Bus voltage operation from 7V to 15V
Fixed hiccup current limit by sensing Rdson of
controller is optimized to convert single supply 12V bus
voltage to as low as 0.8V output voltage. Internal UVLO
n
Synchronous MOSFET
Internal 300kHz
keeps the regulator off until the supply voltage exceeds ^{n Internal Digital Soft Start Function}
7V where internal digital soft starts get initiated to ramp ^{n Adaptive deadband Control}
up output. The NX2307 employs fixed current limiting ^{n Shut Down via pulling COMP pin}
followed by HICCUP feature. Other features includes: ^{n Pb-free and RoHS compliant}
12V gate drive capability , Converter Shutdown by pull-
ing COMP pin to Gnd, Adaptive dead band control.
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
TYPICAL APPLICATION
Vin
+12V
M3
HI=SD
C7
200pF
L2 1uH
C4
100uF
R6
10
C3
1uF ₅
Vcc
R4
5.36k
7 _COMP
D1 MBR0530T1
1
BST
Hdrv ²
C6
0.1uF
SW ⁸
C2
6.8nF
6 _FB
Ldrv ⁴
Gnd
3
C5
1uF
M1
IRFR3706
L1 1.5uH
R1
M2 ^1.43k
IRFR3706
C1
2.7nF
Cin
16SVP180M
16V,180uF
Vout
+1.8V 10A
Co
4SEPC560M
560uF,7mohm
R2
10k
R3
8k
Device
NX2307CSTR
Figure1 - Typical application of NX2307
ORDERING INFORMATION
Temperature
0 to 70^oC
Package
SOIC - 8L
Frequency
300kHz
Pb-Free
Yes
Rev. 3.2
1
06/22/06