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SC1185ACSW Scheda tecnica(PDF) 1 Page - Semtech Corporation |
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SC1185ACSW Scheda tecnica(HTML) 1 Page - Semtech Corporation |
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1 / 12 page  PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW DROPOUT REGULATOR CONTROLLER © 1999 SEMTECH CORP. PRELIMINARY - January 6, 1999 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1185 SC1185A 1 DESCRIPTION The SC1185 combines a synchronous voltage mode controller with two low-dropout linear regulators providing most of the circuitry necessary to implement three DC/DC converters for powering advanced microprocessors such as Pentium ® II . The SC1185 switching section features an integrated 5 bit D/A converter, pulse by pulse current limiting, integrated power good signaling, and logic compatible shutdown. The SC1185 switching section operates at a fixed frequency of 140kHz, providing an optimum compromise between size, efficiency and cost in the intended application areas. The integrated D/A con- verter provides programmability of output voltage from 2.0V to 3.5V in 100mV increments and 1.30V to 2.05V in 50mV increments with no external compo- nents. The SC1185 linear sections are low dropout regula- tors supplying 1.5V for GTL bus and 2.5V for non- GTL I/O. The Reference voltage is made available for external linear regulators. Pentium is a registered trademark of Intel Corporation TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com BLOCK DIAGRAM 2.5V/ADJ. 1.5V/ADJ. 1.265V FET CONTROLLER REF. FET CONTROLLER REF. VCC CS- CS+ EN BSTH DH PGNDH BSTL DL PGNDL LDOV GATE2 LDOS2 AGND REF VID4 VID3 VID2 VID1 VID0 VOSENSE PWRGOOD LDOS1 GATE1 D/A PIN CONFIGURATION AGND GATE1 LDOS1 LDOS2 VCC REF PWRGOOD CS- CS+ PGNDH DH PGNDL 1 2 3 LDOV 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VOSENSE EN BSTH BSTL DL VID0 VID1 VID2 VID3 VID4 GATE2 Top View (24 Pin SOIC) FEATURES • Synchronous design, enables no heatsink solution • 95% efficiency (switching section) • 5 bit DAC for output programmability • On chip power good function • Designed for Intel Pentium® ll requirements • 1.5V, 2.5V @ 1% for linear section • 1.265V ± 1.5% Reference available APPLICATIONS • Pentium® ll microprocessor supplies • Flexible motherboards • 1.3V to 3.5V microprocessor supplies • Programmable triple power supplies ORDERING INFORMATION Part Number (1) Package Linear Voltage Temp. Range (T J) SC1185CSW SO-24 1.5V/2.5V 0° to 125°C SC1185ACSW (2) SO-24 1.5V/2.5V 0° to 125°C Note: (1) Add suffix ‘TR’ for tape and reel. (2) SC1185A provides improved output tolerance. See Output Voltage Table. |
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