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PDF SC1144ABCSW Data sheet ( Hoja de datos )
| Número de pieza | SC1144ABCSW | |
| Descripción | PROGRAMMABLE/ HIGH PERFORMANCE MULTI-PHASE/ PWM CONTROLLER | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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PROGRAMMABLE, HIGH PERFORMANCE
MULTI-PHASE, PWM CONTROLLER
SC1144
Preliminary - August 24, 1999
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1144 is a high performance, multi-phase
(PWM) controller designed for high power micropro-
cessors requiring ultra fast transient response, such as
the Pentium®ll and beyond. Utilizing a novel and
unique design, the controller distributes the output load
across (up to) four converter channels by digitally
phase shifting the PWM outputs. This approach
greatly reduces the stress and heat on the output
stage components while lowering input ripple current
by as much as 80%. Accurate current sharing among
the four phases is achieved by precision design tech-
niques and trimming of critical elements.
The high speed transconductance error amplifier is
externally initialized using a soft-start capacitor allow-
ing the controller to “wake-up” without overshoot, thus
protecting the low voltage microprocessor loads. The
output drive voltage to the power MOSFETs is pro-
grammable to minimize switching losses in the drive
circuitry.
The floating feedback ground allows remote sense ca-
pability. The output voltage is digitally programmable
by means of a 5 bit DAC. A single resistor programs
the master clock frequency (8MHz max) or the con-
troller may be synchronized using an external oscilla-
tor. The number of operating phases is programmed
independently of the external clock. The parts features
under-voltage lock-out with hysteresis and over-
current protection.
PIN CONFIGURATION
FEATURES
• Allows use of small surface mount components
• Ultra fast transient recovery time
• Wide, High frequency operating range
• Selectable 2, 3, 4 phase operation
• Floating feedback ground for remote sensing
• Precision load current sharing
• Selectable internal or external clock
• Soft start, Over current protection
• 5-bit DAC programmable output
• programmable clock, 200Khz-2Mhz per phase
APPLICATIONS
• High end servers and workstations
• High current/Ultra-fast transient microprocessors
• Voltage Regulator Modules
ORDERING INFORMATION
DEVICE (1)
SC1144ABCSW
PACKAGE
SO-24
Note:
(1) Add suffix ‘TR’ for tape and reel.
TEMP. (TJ)
0 - 85°C
BLOCK DIAGRAM
Top View
(24-Pin SOIC)
The SC1144 is patent pending
© 1999 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
1
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 page  
PROGRAMMABLE, HIGH PERFORMANCE
MULTI-PHASE, PWM CONTROLLER
Preliminary - August 24, 1999
OUTPUT VOLTAGE
Unless specified: 0 = GND; 1 = High (or Floating).
TA = 25°C, VCC5V = 5V, VCC12V = 12V, 4-Phase operation.
PARAMETER
Output Voltage
VID
43210
01111
01110
01101
01100
01011
01010
01001
01000
00111
00110
00101
00100
00011
00010
00001
00000
11111
11110
11101
11100
11011
11010
11001
11000
10111
10110
10101
10100
10011
10010
10001
10000
MIN
1.287
1.336
1.386
1.435
1.485
1.534
1.584
1.633
1.683
1.732
1.782
1.831
1.881
1.930
1.980
2.029
1.980
2.079
2.178
2.277
2.376
2.475
2.574
2.673
2.772
2.871
2.970
3.069
3.168
3.267
3.366
3.465
TYP
1.300
1.350
1.400
1.450
1.500
1.550
1.600
1.650
1.700
1.750
1.800
1.850
1.900
1.950
2.000
2.050
2.000
2.100
2.200
2.300
2.400
2.500
2.600
2.700
2.800
2.900
3.000
3.100
3.200
3.300
3.400
3.500
SC1144
MAX
1.313
1.364
1.414
1.465
1.515
1.566
1.616
1.667
1.717
1.768
1.818
1.869
1.919
1.970
2.020
2.071
2.020
2.121
2.222
2.323
2.424
2.525
2.626
2.727
2.828
2.929
3.030
3.131
3.232
3.333
3.434
3.535
The SC1144 is patent pending
© 1999 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320
5 Page 
PROGRAMMABLE, HIGH PERFORMANCE
MULTI-PHASE, PWM CONTROLLER
SC1144
Preliminary - August 24, 1999
An evaluation board is available which may be ordered directly from the factory. SC1144EVB is a DC/DC con-
verter utilizing the SC1144 four-phase controller in an asynchronous appliaction. The SC1144-SYNCH-EVB uti-
lizes SC1405 high speed MOSFET drivers to drive the TOP and Synchronous MOSFETs with enhanced features.
The evaluation boards are intended as guidelines for board design, layout and to assess key performance parame-
ters, such as transient response, thermal stress management and input and output ripple considerations. The
SC1144EVB includes a SLOT1 connector for Pentium II, a DIP switch for mode/voltage selection as well as quali-
fied selection of components for the SC1144 operation. The SC1144EVB user manual contains useful applications
information. Both Evaluation boards may be ordered from our website at www.semtech.com.
OUTLINE DRAWING - SO-24
JEDEC MS-013AD
B17104B
The SC1144 is patent pending
© 1999 SEMTECH CORP.
11
652 MITCHELL ROAD NEWBURY PARK CA 91320
11 Page | ||
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| PDF Descargar | [ Datasheet SC1144ABCSW.PDF ] | |
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