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PDF SC1146 Data sheet ( Hoja de datos )
| Número de pieza | SC1146 | |
| Descripción | VRM9.0 PROGRAMMABLE/ MULTI-PHASE/ HIGH PERFORMANCE PWM CONTROLLER | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC1146 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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VRM9.0 PROGRAMMABLE, MULTI-PHASE,
HIGH PERFORMANCE PWM CONTROLLER
SC1146
July 25, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1146 is the latest, high performance, multi-
phase (PWM) controller designed for high power mi-
croprocessors requiring ultra fast transient response.
The SC1146 is programmable for the voltage range
required by the latest Microprocessors . 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 ap-
proach greatly reduces the stress and heat on the out-
put stage components while lowering input ripple cur-
rent by as much as 80%. Accurate current sharing
among the four phases is achieved by precision design
techniques and trimming of critical elements.
The high speed transconductance error amplifier is ex-
ternally initialized using a soft-start capacitor allowing
the controller to “wake-up” without overshoot, thus pro-
tecting the low voltage microprocessor loads. The out-
put drive voltage to the power MOSFETs is pro-
grammable to minimize switching losses in the drive
circuitry.
The output voltage is digitally programmable by means
of a 5 bit DAC (new codes). A single resistor programs
the master clock frequency (8MHz max) or the clock
can be supplied by an external source where exact fre-
quency control is desired. 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
•= Dramatic reduction of input ripple current and out-
put ripple voltage
•= 5-bit programmable DAC for the latest, lower
output voltage Microprocessors
•= Wide, High frequency operating range
•= Selectable 2, 3, 4 phase operation
•= +5 Volt only operation eliminates the need for
+12V supply
•= Precision load current sharing,1%PWM match
•= Selectable internal or external clock
•= Soft start/UVLO/Over current protection
APPLICATIONS
•= High end servers and workstations
•= High current/Ultra-fast transient microprocessors
ORDERING INFORMATION
DEVICE (1)
PACKAGE
SC1146CSW.TR
SO-24
TEMP. (TJ)
0 - 85°C
Note:
(1) Only available in tape and reel packaging. A reel
contains 1000 devices.
BLOCK DIAGRAM
Top View
(24-Pin SOIC)
The SC1146 is patent pending
© 2000 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
1
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 page  
VRM9.0 PROGRAMMABLE, MULTI-PHASE,
HIGH PERFORMANCE PWM CONTROLLER
SC1146
July 25, 2000
OUTPUT VOLTAGE
Unless specified: 0 = GND; 1 = High (or Floating).
TA = 25°C, VCC5V = 5V, VCC2 = 5V, 4-Phase operation.
VID4
VID3
VID2
11
11
11
11
11
11
11
11
10
10
10
10
10
10
10
10
01
01
01
01
01
01
01
01
00
00
00
00
00
00
00
00
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
VCCCORE
(VDC)
Output Off
1.1
1.125
1.15
1.175
1.2
1.225
1.250
1.275
1.3
1.325
1.35
1.375
1.4
1.425
1.45
1.475
1.5
1.525
1.55
1.575
1.6
1.625
1.65
1.675
1.7
1.725
1.75
1.775
1.8
1.825
1.85
The SC1146 is patent pending
© 2000 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SC1146.PDF ] | |
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