Evaluation board available.
NX2415
TWO PHASE SYNCHRONOUS PWM CONTROLLER WITH
INTEGRATED FET DRIVER AND DIFFERENTIAL CURRENT SENSE
PRELIMINARY DATA SHEET
Pb Free Product
FEATURES
n Differential inductor DCR sensing eliminates the
problem with layout parasitic
n External programmable voltage droop
n Low Impedance On-board Drivers
n Hiccup current limit
n Power Good for power sequencing
n Enable Signal allows external shutdown as well as
programming the BUS voltage start up threshold
n Programmable frequency
DESCRIPTION
The NX2415 is a two-phase PWM controller with inte-
grated FET driver designed for low voltage high current
application. The two phase synchronous buck converter
offers ripple cancelation for both input and output. The
NX2415 uses differential remote sensing using either
current sense resistor or inductor DCR sensing to achieve
accurate current matching between the two channels.
Differential sensing eliminates the error caused by PCB
board trace resistance that is otherwise is present when
using a single ended voltage sensing. In addition the
NX2415 offers high drive current capability especially for
keeping the synchronous MOSFET off during SW node
transition, accurate programmable droop allowing to re-
duce number of output capacitors, accurate enable cir-
cuit provides programmable start up point for Bus volt-
age, PGOOD output, programmable switching frequency
and hiccup current limiting circuitry.
n Prebias start up
n Over voltage protection without negative spike at
output
n Pb-free and RoHS compliant
APPLICATIONS
n
Graphic card High Current Vcore Supply
n High Current +40A on board DC to DC converter
applications
TYPICAL APPLICATION
10
23
+5V
31
1uF
30
PVCC1
1uF
+5V
1uH
VCC
EN
VIN1
2 x 10uF
+12V
24
10k
BST1
HDRV1
SW1
180uF
100uF
0.22uF
2.15
25
26
M1
M2
6.49k
+12V
0.68uH
VOUT
+1.2V/50A
1.65k
29
ENBUS
op
2 x (1000uF,7mohm ESR)
620
1uF
22
21
7
2
LDRV1
PGND1
DROOP
RT
45.3k
10k
620
+5V
9
10
28
11
CS+1
CS-1
PGOOD
CSCOMP
18
17
+5V
PVCC2
VOUT
430
220nF
2.2nF
1uF
3
PGSEN
10uF
BST2
HDRV2
SW2
10k
1nF
20k
0.22uF
2.15
16
15
M3
M4
1.8nF
3.92k
5
FB
0.68uH
6.8nF
5.62k
6
VCOMP
10k
20k
19
20
620
1uF
150pF
10nF
100k
2N3906
1k
LDRV2
PGND2
4
8
1
VP
620
OCP
180k
12
13
VREF
CS+2
CS-2
10nF
1nF
14
IOUT
AGND
32
Figure1 - Typical application of NX2415
ORDERING INFORMATION
Device
NX2415CMTR
Temperature
0 to 70oC
Package
MLPQ-32L
Frequency
Pb-Free
200kHz to 1MHz
Yes
Rev.4.8
05/06/08
1