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Evaluation board available.
NEXSEMNEXSEM
NX2415
NEXSEM
NEXSEMNEXSEM
TWO PHASE SYNCHRONOUS PWM CONTROLLER WITH
INTEGRA TED FET DRIVER AND DIFFERENTIAL CURRENT SENSE
PRELIMINARY DA T A SHEET
DESCRIPTION
The NX2415 is a two-phase PWM controller with integrated 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 reduce number of output capacitors, accurate enable circuit provides programmable start up point for Bus voltage, PGOOD output, programmable switching frequency
and hiccup current limiting circuitry .
Differential inductor DCR sensing eliminates the
problem with layout parasitic
External programmable voltage droop
Low Impedance On-board Drivers
Hiccup current limit
Power Good for power sequencing
Enable Signal allows external shutdown as well as
programming the BUS voltage start up threshold
Programmable frequency
APPLICATIONS
Graphic card High Current Vcore Supply
High Current +40A on board DC to DC converter
applications
TYPICAL APPLICA TION
FEATURES
+5V
+12V
+5V
VOUT
124k
390
2.2nF
1nF
77k
80k
470pF
5.11k
12k
200k
91k
10k
10
1k
330nF
10pF
1k
1.5nF
1uF
31
30
1uF
11
23
29
7
2
28
3
5
6
7
4
8
1
VCC
EN
ENBUS
DROOP
RT
PGOOD
CSCOMP
VSEN
FB
VCOMP
VP
OCP
VREF
N X 2 4 1 5
AGND
32
PVCC1
BST1
HDRV1
LDRV1
PGND1
CS+1
CS-1
PVCC2
BST2
HDRV2
LDRV2
PGND2
CS+2
CS-2
SW1
SW2
1uF
24
25
26
22
21
9
10
16
15
19
20
12
13
0.1uF
18
1uF
17
0.1uF
Figure1 - Typical application of NX2415
+5V
+12V
1uH
1uH
1k
1k
3.3uH
1uF
10pF
4.7uH
1uF
10pF
100uF
5 x 680uF
1k
100uF
1k
100uF
M1
M2
100uF
M1
M2
VIN1
+5V
VOUT
+1.3V
VIN2
+12V
Rev. 1.0
01/24/05
ORDERING INFORMA TION
Device Temperature Package Frequency
NX2415CMTR 0 to 70oC MLPQ-32L 200kHz to 1MHz
www.nexsem.com
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