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PDF SC2643VX Data sheet ( Hoja de datos )
| Número de pieza | SC2643VX | |
| Descripción | Multi-Platform Multi-Phase PWM Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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POWER MANAGEMENT
Description
The SC2643VX provides a solution for microprocessor core
voltage regulation with up to 4 paralleled PWM channels.
The solution can also be configured as 2, 3, or 4-phase
form. This multi-phase buck regulator utilizes the phase-
shift timing control to allow interleaved switching of the
power switches. This architecture minimizes the core volt-
age ripple and the input current ripple, which leads to op-
timized voltage regulator design for power density, tran-
sient responses, and the thermal performances.
To satisfy the highly dynamic nature of the modern micro-
processors, the SC2643VX adopts peak current mode con-
trol topology which ensures wide control loop bandwidth
and fast transient responses. The current mode control
provides intrinsic phase current matching. The maximum
ripple frequency is greater than 2.8MHz.
One of the outstanding features of the SC2643VX is its
voltage regulation accuracy. Not only does it provide bet-
ter than 0.5% set point accuracy, but also the accuracy to
be fully compliant with stringent load line slope specifica-
tions mandated by the modern microprocessors. Lossless
output current sensing ensures the regulator output volt-
age is accurately positioned according to the load current
condition, and an internal temperature compensation tech-
nology further enhances the performance of voltage accu-
racy.
SC2643VX
Multi-Platform
Multi-Phase PWM Controller
load current on the ground plane. External offset is easy
to achieve for any platforms and the VID settings. The
enable function is also provided to interface with the cor-
responding system signal for correct start up timing and
shut down timing.
(Multiple Patents Pending)
Features
VRD/VRM10.X, VRM9.X, and K-8 compliant
Core Voltage Set Point Accuracy 0.5%
Combi-SenseTM Current Mode Control
Intrinsic Phase Current Matching
Fast Transient Responses
Active Droop with Temperature Compensation to
Meet Load Line Slope
Support VID-on-Fly with 5 or 6 bit VID
Enable Function for Power Sequencing
Cycle-by-Cycle Peak Current Limit
Intelligent Over Current Shut Down
Over Voltage Protection When Using Semtech
Combi-SenseTM Driver
Under Voltage Protection Built in
External programmable Soft-Start
Externally programmable switching frequency (up to
2.8MHz output voltage ripple frequency)
2, 3, or 4-Phase Configurations
The patented Combi-SenseTM topology is employed by
SC2643VX. The MOSFET Rds(on) and the output inductor
winding resistance are used to generate the phase current
information. The Combi-SenseTM MOSFET driver plus the
SC2643VX enables the complete solution.
The SC2643VX is a multi-platform controller. It conforms
to Intel VRM/VRD10.X, VRM9.X, and AMD K-8 (OpteronTM)
VID specifications. With very minor changes of the sche-
matic and the layout, the SC2643VX based solution can
be ported form one platform to another. This greatly ben-
efits system manufactures by reducing design cycle times
and streamlining inventory management.
Applications
Voltage Regulator VRD/VRM10.X
Voltage Regulator VRM9.X
Voltage Regulator K-8
High Current, Low Voltage Step Down DC/DC
Converters
The SC2643VX supports VID-on-Fly applications for any
platform. The cycle-by-cycle current limit plus the intelli-
gent over current shut down provide the maximum versa-
tility of the system without false tripping under all possible
changes of VID and load conditions. The differential volt-
age feedback sense eliminates the error caused by high
May 11, 2005
1 www.semtech.com
1 page  
SC2643VX
wwPw.ODaWtaSEhReet4MU.AcoNm AGEMENT
Electrical Characteristics (Cont.)
Unless specified: VCC = 12V, VID=1.30V (110110,VRD10) or 1.50V (101110,VRD10), FOSC = 600kHz, TA = 27oC. See Typical Application Circuit.
Parameter
Symbol
Test Conditions
Min Typ Max
Units
Oscillator Section
Oscillator Frequency
Oscillator Frequency Range
Temperature Stability
3-Phase Operation
FOSC
FOSC
ROSC = 309K
0oC < TA < 85oC
540 600 660 kHz
330 2800 kHz
±5 %
Output 4 pull up Threshold
For 3-phase operation
3.5 4 4.5 V
Droop Amplifier
Gain
Gain Accuracy(1)
GDA
5.4 V/V
±5 %
Current Limit Section
Shutdown Voltage
VID - Shut Down Threshold
550 650 750 mV
Dynamic VID Section
Sinking Current of DACSTEP
IDAC_SINK
Sourcing Current of DACSTEP
IDAC_SRC
NOTES: 1) Guaranteed by design, not tested in production.
Specifications subject to change without notice.
390 uA
340 uA
2005 Semtech Corp.
5
www.semtech.com
5 Page 
SC2643VX
wwPw.ODaWtaSEhReet4MU.AcoNm AGEMENT
Outline Drawing - TSSOP-24
N
2X E/2
A
PIN 1
INDICATOR
ccc C 1 2 3
2X N/2 TIPS
aaa C
SEATING
PLANE
C
e/2
B
D
bxN
bbb
eD
E1 E
DIMENSIONS
DIM
INCHES
MIN NOM MAX
MILLIMETERS
MIN NOM MAX
A-
- .047 -
- 1.20
A1 .002 - .006 0.05 - 0.15
A2 .031 - .042 0.80 - 1.05
b .007 - .012 0.19 - 0.30
c .003 - .007 0.09 - 0.20
D .303 .307 .311 7.70 7.80 7.90
E1 .169 .173 .177 4.30 4.40 4.50
E .252 BSC
6.40 BSC
e .026 BSC
0.65 BSC
L .018 .024 .030 0.45 0.60 0.75
L1 (.039)
(1.0)
N 24
24
01 0° - 8° 0° - 8°
aaa .004
0.10
bbb .004
0.10
ccc .008
0.20
A2 A
A1
H
C A-B D
GAGE
PLANE
c
SIDE VIEW
0.25
SEE DETAIL A
L
(L1)
DETAIL A
01
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H-
3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
4. REFERENCE JEDEC STD MO-153, VARIATION AD.
Land Pattern - TSSOP-24
X
DIMENSIONS
DIM INCHES MILLIMETERS
C (.222)
(5.65)
(C)
GZ
G .161
4.10
P .026
0.65
X .016
0.40
Y
Y .061
Z .283
1.55
7.20
P
NOTES:
1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Rd., Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
2005 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SC2643VX.PDF ] | |
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