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參數資料
| 型號： | SC1146CSW |
| 廠商： | Semtech Corporation |
| 英文描述： | VRM9.0 PROGRAMMABLE, MULTI-PHASE, HIGH PERFORMANCE PWM CONTROLLER |
| 中文描述： | VRM9.0可編程多相位，高性能的PWM控制器 |
| 文件頁數： | 1/10頁 |
| 文件大小： | 148K |
| 代理商： | SC1146CSW |
VRM9.0 PROGRAMMABLE, MULTI-PHASE,
HIGH PERFORMANCE PWM CONTROLLER
SC1146
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
July 25, 2000
1
The SC1146 is patent pending
Pentium is a registered trademark of Intel Corporation
BLOCK DIAGRAM
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
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DEVICE
(1)
PACKAGE
TEMP. (T
J)
SC1146CSW.TR
SO-24
0 - 85°C
ORDERING INFORMATION
Note:
(1) Only available in tape and reel packaging. A reel
contains 1000 devices.
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
Top View
(24-Pin SOIC)
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| SC1146CSW.TR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:VRM9.0 PROGRAMMABLE, MULTI-PHASE, HIGH PERFORMANCE PWM CONTROLLER |
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