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PDF SC2647 Data sheet ( Hoja de datos )
| Número de pieza | SC2647 | |
| Descripción | Multi-Platform Multi-Phase PWM Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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POWER MANAGEMENT
Description
The SC2647 provides microprocessor core voltage
regulation solution up to 4 paralleled PWM channels. The
solution can also be configured as 2, 3, or 4-phase form.
Multi-phase buck regulator utilizes the phase-shift tim-
ing control to allow interleaved switching of the power
switches. This architecture minimizes the core voltage
ripple and the input current ripple, which leads to opti-
mized voltage regulator design for power density, tran-
sient responses, and the thermal performances.
To satisfy the highly dynamic nature of the modern
microprocessors, the SC2647 adopts peak current mode
control 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 1MHz.
One of the outstanding features of the SC2647 is its
voltage regulation accuracy. Not only it provides better
than 0.5% set point accuracy, but also the accuracy to
fully complaint with the stringent load line slope
specifications mandated by the modern microprocessors.
Lossless output current sensing ensures the regulator
output voltage is accurately positioned according to the
load current condition, and an internal temperature
compensation technology further enhances the perfor-
mance of voltage accuracy.
The patented Combi-SenseTM topology is employed by
SC2647. The MOSFET Rds(on) and the output inductor
winding resistance is used to generate the phase cur-
rent information. The SC1211VX Combi-SenseTM MOSFET
driver plus the SC2647 enables the complete solution.
The SC2647 is a multi-platform controller. It conforms
to Intel VRM/VRD10.0, VRM9.X, and AMD K-8 (OpteronTM)
VID specifications. With very minor changes of the sche-
matic and the layout, the SC2647 based solution can be
ported form one platform to another. This greatly ben-
efits the system manufactures for reductions of design
cycle and minimize the inventory management.
SC2647
Multi-Platform
Multi-Phase PWM Controller
The VID structure of the SC2647 supports VID-on-Fly ap-
plications for any platform. The cycle-by-cycle current
limit plus the intelligent over current shut down provide
the maximum versatility of the system without false
tripping under all possible changes of VID and load
conditions. The differential voltage feedback sense
eliminates the error caused by high 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 corresponding sys-
tem signal for correct start up timing and shut down
timing.
(Multiple Patents Pending)
Features
VRD/VRM10.0, 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/1211VX
Under Voltage Protection Built in
External programmable Soft-Start
Externally programmable switching frequency.
2, 3, or 4-Phase Configurations
24-Pin SOIC or TSSOP Packages
This device is fully WEEE and RoHS Compliant
Applications
Voltage Regulator VRD/VRM10.0
Voltage Regulator VRM9.X
Voltage Regulator K-8
High Current, Low Voltage Step Down DC/DC
Converters
July, 12, 2006
1 www.semtech.com
1 page  
SC2647
wwPwO.DaWtaSEhReetM4U.AcoNmAGEMENT
Pin Configurations
Top View
OS3
OS2
OS1
BGOUT
ERROUT
GSENSE
FB
DACSTEP
VCC
VID4
VID3
VID2
1 24 OS4
2 23 OUTSEN
3 22 OUT4
4 21 OUT3
5 20 OUT2
6 19 OUT1
7 18 AGND
8 17 OSCREF
9 16 PGOOD
10 15 VID5
11 14 VID0
12 13 VID1
(24-Pin SOIC/TSSOP)
Ordering Information
Part Number
SC2647SWTR (1)
Package
SOIC-24
Temp. Range (TJ)
0 to 125 OC
SC2647TSTR (1)
TSSOP-24
0 to 125 OC
SC2647TSTRT (1,3)
TSSOP-24
0 to 125 OC
SC2647EVB (2)
Evaluation Board
Note:
(1) Only available in tape and reel packaging. A reel contains 1000 devices
for the SOIC-24 and 2500 devices for the TSSOP-24 package.
(2) Specify SOIC-24 or TSSOP-24 package.
(3) Lead free product. This product is fully WEEE and RoHS compliant.
Pin Descriptions
Pin# Pin N ame
Pin Function
1
OS3
C urrent sense input.
2
OS2
C urrent sense input.C onnect to OUTSE N for 2 phase operation.
3
OS1
C urrent sense input.
4 B GOUT B G reference pin.C onnect soft start cap from this pin to A GND .
5 E RROUT E rror-amplifier output.C onnect compensation network to A GND .
6 GS ENS E Remote sense for GND .
7 FB Feedback pin.Route FB and GE NSE as differential pair to C P U.
8 D A C S TE P V ID ste p s p e e d .C o nne c t a ca p fro m this p i n to A GND to fi lte r D A C o utp ut.
9
VCC
P ower supply for chip.
10~14
V ID 4 : 0 V ID M S B to V ID L S B .
15
V ID 5
12.5mV bit for V RD 10.x. P ull it up to >2V and program the sink current to
se le ctV RM 9 o r K 8 V ID ta b le .
16 PGOOD P ower good, Open collector output.
17 OS C REF Oscillator frequency setting .C onnect a resistor to A GND .
18
AGND
C lean ground for analog signals.
19
OUT1
P WM output1.
20
OUT2
P WM output2.
21
OUT3
P WM output3.
22
OUT4
P WM output4. C onnect to V C C for 3 phase operation.
23 OUTS E N D irect output sense.
24 OS4
© 2006 Semtech Corp.
C urrent sense input. C onnect to OUTSE N for 2 or 3 phase operation.
5 www.semtech.com
5 Page 
SC2647
wwPwO.DaWtaSEhReetM4UA.coNmAGEMENT
Outline Drawing - TSSOP-24
2X E/2
N
A
PIN 1
INDICATO R
ccc C 1 2 3
2X N/2 TIPS
aaa C
S E A T IN G
PLANE
C
e/2
B
D
eD
E1 E
D IM
A
A1
A2
b
c
D
E1
E
e
L
L1
N
01
aaa
bbb
ccc
DIM ENSIONS
IN C H E S
M ILLIM ETERS
M IN NOM M AX M IN NOM M AX
- - .047 - - 1.20
.002 - .006 0.05 - 0.15
.031 - .042 0.80 - 1.05
.007 - .012 0.19 - 0.30
.003 - .007 0.09 - 0.20
.303 .307 .311 7.70 7.80 7.90
.169 .173 .177 4.30 4.40 4.50
.252 BSC
6.40 BSC
.026 BSC
0.65 BSC
.018 .024 .030 0.45 0.60 0.75
(.039)
(1 .0 )
24 24
0 -8 0 -8
.0 0 4
0.10
.0 0 4
0.10
.0 0 8
0.20
A2 A
bxN
bbb
A1
C A-B D
H
GAGE
PLANE
c
SIDE VIEW
0.25
SEE DETAIL A
L
(L1)
DETAIL A
01
NOTES:
1. C O N TR O LLIN G D IM E N S IO N S AR E IN M ILLIM ETE RS (A N G LE S IN D EG R EES ).
2. D ATU M S -A- A N D -B- TO B E D E TE RM IN E D AT D ATU M PLAN E -H -
3. D IM EN SIO N S "E 1" A N D "D " D O N O T IN C LU D E M O LD FLASH , PR O TR U SIO N S
OR GATE BURRS.
4. REFERENCE JEDEC STD MO -153, VARIATION AD.
Land Pattern - TSSOP-24
X
D IM
C
(C )
GZ
G
P
X
Y
YZ
P
NOTES:
1. T H IS L A N D P A T TE R N IS F O R R E F E R E N C E P U R P O S E S O N L Y .
C O N SU LT YO U R M A N U FAC TU R IN G G R O U P TO EN SU R E YO U R
C O M P A N Y 'S M A N U F A C TU R IN G G U ID E L IN E S A R E M E T.
Contact Information
D IM EN SIO N S
IN C H ES
M ILLIM E TE R S
(.2 2 2 )
(5.65)
.1 6 1
4 .1 0
.0 2 6
0 .6 5
.0 1 6
0 .4 0
.0 6 1
1 .5 5
.2 8 3
7 .2 0
Semtech Corporation
Power Management Products Division
200 Flynn Rd., Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
© 2006 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SC2647.PDF ] | |
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