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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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SC1144ABCSW bảng dữ liệu(PDF) 1 Page - Semtech Corporation |
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SC1144ABCSW bảng dữ liệu(HTML) 1 Page - Semtech Corporation |
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1 / 11 page  PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, PWM CONTROLLER SC1144 © 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 Preliminary - August 24, 1999 1 The SC1144 is patent pending Pentium is a registered trademark of Intel Corporation BLOCK DIAGRAM 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 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DEVICE (1) PACKAGE TEMP. (T J) SC1144ABCSW SO-24 0 - 85°C ORDERING INFORMATION Note: (1) Add suffix ‘TR’ for tape and reel. 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. (24-Pin SOIC) Top View |
Số phần tương tự - SC1144ABCSW |
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Mô tả tương tự - SC1144ABCSW |
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