NX2601 Datasheet, PDF (1/25 Pages) Microsemi Corporation – DUAL SYNCHRONOUS PWM CONTROLLER WITH NMOS LDO CONTROLLER & 5V BIAS REGULATOR

Evaluation board available.
NX2601
DUAL SYNCHRONOUS PWM CONTROLLER WITH NMOS LDO
CONTROLLER & 5V BIAS REGULATOR
PRELIMINARY DATA SHEET
Pb Free Product
DESCRIPTION
FEATURES
The NX2601 controller IC is a triple controller with a dual
channel synchronous Buck controller IC and an LDO con-
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Two channel PWM with out of phase operation
Individual digital soft start for two PWM output
troller designed for multiple converters such as PCIe
graphic card applications .The two synchronous PWM
controllers are 180 degree out of phase which reduces
the input ripple current, allowing to reduce the # of input
capacitors.Another main feature of the part is that it can
operate from single 12V supply while maintaining a regu-
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and LDO controller
Bus voltage operation from 2V to 25V
Hiccup Current limit by sensing Rdson of MOSFET
Adjustable frequency up to 1Mhz per channel
Adaptive deadband time
Three enable pin available allows for independent
lated 5V supply for the biasing and the internal drivers. ^{power sequencing}
Other features of NX2601 are: programmable frequency
from 200kHz to 1MHz, independent digital soft start and
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MLPQ-32L package offers small size
Pb-free and RoHS compliant
enable pins for each controller which allows for different
APPLICATIONS
power sequencing, Adaptive driver provides optimized ef- n PCI Graphic Card on board converters
ficiency while maintain sufficient deadband, Vcc n Vddq Supply in mother board applications
undervoltage lock out and current limiting using an Rds- n On board DC to DC such as
on of the external MOSFET with HICCUP feature.
12V to 3.3V, 2.5V or 1.8V
n FPGA and Set Top Box Applications
TYPICAL APPLICATION
R11 10
+5V
C17
68uF
R12
C15
5k
1uF
5
VIN1
VIN2
+3.3V
VOUT3
+2.5V/2A
C20
150uF
2N3904
M5
R18
1.5k
47pF
C16
11
R13
REG FB
VCC
1.65k
5k
C24 1uF
10 _{REG OUT}
9 _AUXVCC
8 _{LDO OUT}
R15 C18
0
C19
R16
5k
150uF
150pF
R17
2.35k
7 _{LDO FB}
OFF R2510k
ON
R26
10k
2N3904
R19
1.25k
3 _ENLDO
C25
1uF
PVCC1 ²³
BST1 ²⁴
HDRV1 ²⁵
SW1 ²⁶
OCP1 ²⁷
LDRV1 ²²
PGND1 ²¹
Fb1 ²⁹
28
Comp1
PVCC2 ¹⁸
C1
1uF
+5V
D1
C4
0.1uF
M1
R1 10.5k
M2
R5 5k _{8.2nF C5}
C22 220pF
C8
1uF
+5V
L1 1uH
C2
180uF
L2 0.78uH
R2
1.5k
C6
2.7nF
C3
100uF
R3
10.4k
R4
20.8k
VIN1
+12V
VOUT1
+1.2V@15A
C7
2 x (2R5TPD680M6,680uF,6mohm)
R20
VIN1
6.8k
1 _ENSW1
R21
1.25k
OFF R2710k
ON
R28
10k
2N3904
2 _ENSW2
BST2 ¹⁷
HDRV2 ¹⁶
D2
C11
0.1uF
SW2 ¹⁵
OCP2 ^{14 R6 6k}
C9
180uF
M3
L4 1.5uH
R7
VOUT2
+1.8V/10A
C14
3 x (4TPE150M,150uF,18mohm)
R24 62k
C21 1nF
6 _RT
30
VP
31 _VREF
GND
LDRV2 ¹⁹
PGND2 ²⁰
Fb2 ¹²
Comp2 ¹³
M4
R10 C12
5k 10nF
820
R8
8.7k
C13
3.3nF
R9
6.97k
4
C23 220pF
PATENT PENDING
Figure1 - Typical application of 2601
ORDERING INFORMATION
Device
NX2601CMTR
Temperature
0 to 70^oC
Package
MLPQ-32L
Frequency
200kHz to 1MHz
Pb-Free
Yes
Rev. 2.3
1
12/01/06