Page 1
Evaluation board available.
NEXSEMNEXSEM
NEXSEM
NEXSEMNEXSEM
2-4 PHASE SELECT ABLE VRD10.X CONTROLLER
DESCRIPTION
The NX2511 is a multiphase PWM controller with the
ability to operate in 2,3 or 4 phase control operation.
This device with external FET drivers such as NX3202 ,
NX3203 or NX3212 is designed to provide a high performance high current multiphase converter that meets
the VRD10.0 specification.The NX251 1 uses differential
remote sensing using either current sense resistor or
inductor DCR sensing to achieve accurate current matching between the three channels. Differential sensing eliminates the error caused by PCB board trace resistance
that is otherwise present when using a single ended voltage sensing. In addition the NX2511 offers complete
VRD10 signal interface using 6 bit DAC with on the fly
DAC change, 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 .
NX2511
PRELIMINARY DA T A SHEET
FEATURES
VRM9/VRM10 compatible 6 bit VID
Programmable output voltage droop control.
Programmable UVLO for both BUS voltage and
external drivers.
Over Volt age Protection (OVP).
Hiccup Current current Limit (OCP).
Power Good signal for Power Sequencing.
Differential Inductor voltage current sensing
2 to 4 Phase selectable interleaved PWM stages.
Internal Soft start operation
Programmable switching frequency from 100kHz to
600kHz per phase.
Fast Transient Response using High Bandwidth
Amplifier.
APPLICATIONS
Desktop mother board VRD10.X
Low voltage high current applications
TYPICAL APPLICA TION
PHASE1
+5V
+12V
+5V
CS2
1k
1uF
4
5
6
8
7
9
ENDRV
ENBUS
DROOP
RT
OVP
PGOOD
OFS
CS2COMP
CS3COMP
CS4COMP
VP
VCOMP
FB
DIFF
VID0
VID1
VID2
VID3
VID4
VID12.5
48
EN
5.11k
12k
39
47
200k
12
91k
37
10k
40
150pF
1k
1.5nF
80k
1.5nF
2.2nF
67k
10pF
16
19
CS3
22
CS4
2.2nF
323
45
44
43
42
41
46
AGND
N X 2 5 1 1
1,36
VCC
10
2,35
PWM1
PWM2
PWM3
PWM4
VSEN
RGND
1uF
STRT
CS+1
CS-1
CS+2
CS-2
CS+3
CS-3
CS+4
CS-4
1uF
34
33
14
15
32
17
18
31
20
21
30
23
24
10
11
EN
IN1
HDRV
SW
LDRV
PGND
PHASE2
PHASE3
PHASE4
BST
VCC
D1
C4
0.1uF
1uH
2200uF
M1
1.5uH
M2
1k
1uF
10pF
Figure1 - T ypical application of 251 1
ORDERING INFORMA TION
Device Temperature Package Frequency
NX2511CMTR 0 to 70oC MLPQ-48 L 200kHz to 1MHz
470uF
1k
+12V
VOUT
12mF
Rev. 1.0
01/24/05
www.nexsem.com
1
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