SC1544 Datasheet | SEMTECH

Description Semtech’s SC1544, SC243x and SC1112A or SC1114 provide all the voltages necessary for an ACPI system. The SC1544 offers five independant supplies: a 5V dual supply for USB, a 3.3V dual supply for PCI, a 3.3V or 2.5V dual supply for memory, a 1.5V or 3.3V supply for AGP and a 1.8V supply. The AGP supply is programmble using the system TYPEDET signal. An on-board internal charge pump eliminates the need for P-channel MOS.ETs and enables function from a single 5V supply (system 5VSB). All dual outputs are over current protected. The SC1544 differs from the SC1547 in three important ways: 1) the device initially starts up in S5, and not G0 like the SC1547; 2) the gate drives for the 1.8V and AGP outputs are always high in normal operation; 3) no OCP on the 1.8V and AGP outputs. ACPI Controller for Advanced Motherboards PRELIMINARY .eatures K plete programmable supply for instantly available K Supports 2.5V memory or 3.3V memory (-2.5 or -3.3 K 5V dual and 3.3V dual supplies are programmable to K Integrated AGP voltage supply with “TYPEDET” signal K K K K K for 3.3V or 1.5V operation Integrated LDO for 1.8V supply Integrated charge pump removes the need for PMOS .ETs, enables single supply operation Over current protection on all dual outputs Inherent soft-start capability TSSOP-24 package be active or inactive in S5 option in part number) PC systems Applications K Instantly available motherboards Typical Application Circuit 5V GND 3.3V GND 5VSB GND 5V DUAL GND 3.3V DUAL GND 3.3V DUAL MEM GND AGP GND 1.8V GND C8 100u F/6.3V C7 100u F/6.3V Q8 IRLR3103 C6 100u F/6.3V Q7 IRLR3103 C5 100u F/6.3V Q5 IRLR3103 Q6 IRLR3103 C4 100u F/6.3V Q3 IRLR3103 C3 100u F/6.3V C2 100u F/6.3V C1 100u F/6.3V Q1 IRLR3103 Q2 IRLR3103 Q4 IRLR3103 U1 1 2 3 4 5 G5 3.3VDM G6 G7 AGP TYPEDET PWR_OK EN /S3 /S5 USB PCI SC1544-3.3 G8 1.8V G4 3.3VD GND G2/3 G1 5VD 5VSB FC +CAP -CAP 24 23 22 21 20 19 18 17 16 15 14 13 C9 0.01u F C10 0.1u F C11 1u F TYPEDET PWR_OK EN /SLP_S3 /SLP_S5 USB...