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SC1155 Scheda tecnica(PDF) 1 Page - Semtech Corporation |
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SC1155 Scheda tecnica(HTML) 1 Page - Semtech Corporation |
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1 / 20 page  POWER MANAGEMENT 1 www.semtech.com SC1155 Programmable Synchronous DC/DC Hysteretic Controller with VRM 9.0 VID Range PRELIMINARY .eatures Applications Revision 2, June 2001 Description The SC1155 is a synchronous-buck switch-mode con- troller designed for use in single ended power supply ap- plications where efficiency is the primary concern. The controller is a hysteretic type, with a user selectable hys- teresis. The SC1155 is ideal for implementing DC/DC converters needed to power advanced microprocessors such as Pentium® llI and Athlon®, in both single and mul- tiple processor configurations. Inhibit, under-voltage lock- out and soft-start functions are included for controlled power-up. SC1155 features include an integrated 5 bit D/A con- verter, temperature compensated voltage reference, current limit comparator, over-current protection, and an adaptive deadtime circuit to prevent shoot-through of the power MOS.ET during switching transitions. Power good signaling, logic compatible shutdown, and over-volt- age protection are also provided. The integrated D/A converter provides programmability of output voltage from 1.1V to 1.85V in 25mV increments. The SC1155 high side driver can be configured as either a ground-referenced or as a floating bootstrap driver. The high and low side MOS.ET drivers have a peak cur- rent rating of 2 amps. K Server Systems and Workstations K Pentium® III Core Supplies K AMD Athlon® Core Supplies K Multiple Microprocessor Supplies K Voltage Regulator Modules K Programmable hysteresis K 5 bit DAC programmable output (1.1V-1.85V) K On-chip power good and OVP functions K Designed to meet latest Intel specifications K Up to 95% efficiency K +1% tolerance over temperature Typical Application Circuit R12 1.0 R14 1.6 L2 1.0uH R3 * R1 * R4 1k R2 1k R5 * R6 20k R7 * R8 10k C5 C10 +12V C8 0.033 R10 1k +5V R9 10k +5V C7 0.1 C1 0.1 Cin Bulk L1 0.5uH PWRGD INHIB "POWER GOOD" "INHIBIT" + _ Vin +5V/12V 1.10 to 1.825V + _ C9 1.0 Q1 .DB6035AL Q2 .DB7030BL Cout Bulk C4 0.01 R11 1k C6 0.1 Cin H. Cout H. C2 0.001 C3 0.1 *) for the values see specific application circuit somewhere else in the datasheet IOUT 1 DROOP 2 OCP 3 VHYST 4 VREFB 5 VSENSE 6 AGND 7 SOFTST 8 N/C 9 LODRV 10 LOHIB 11 DRVGND 12 LOWDR 13 DRV 14 VIN12V 15 BOOT 16 HIGHDR 17 BOOTLO 18 HISENSE 19 LOSENSE 20 IOUTLO 21 INHIBIT 22 VID4 23 VID3 24 VID2 25 VID1 26 VID0 27 PWRGD 28 U1 SC1155 |
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