SC1155 Datasheet | SEMTECH

DESCRIPTION The SC1155 is a synchronous-buck switch-mode controller designed for use in single ended power supply applications where efficiency is the primary concern. The controller is a hysteretic type, with a user selectable hysteresis. The SC1155 is ideal for implementing DC/DC converters needed to power advanced microprocessors such as Pentium® ll I and Athlon®, in both single and multiple processor configurations. Inhibit, under-voltage lockout and soft-start functions are included for controlled power-up. SC1155 Features include an integrated 5 bit D/A converter, temperature pensated voltage reference, current limit parator, over-current protection, and an adaptive deadtime circuit to prevent shoot-through of the power MOSFET during switching transitions. Power good signaling, logic patible shutdown, and over-voltage protection are also provided. The integrated D/A converter provides programmability of output voltage from 1.1V to 1.85V in 25m V increments. The SC1155 high side driver can be configured as either a grounded reference or as a floating bootstrap driver. The high and low side MOSFET drivers have a peak current rating of 2 amps. Features - = Programmable hysteresis - = 5 bit DAC programmable output (1.1V-1.85V) - = On-chip power good and OVP functions - = Designed to meet latest Intel specifications - = Up to 95% efficiency - = +1% voltage tolerance over temperature APPLICATIONS - = Server Systems and Workstations - = Intel Pentium® III Core Supplies - = AMD Athlon® Core Supplies - = Multiple Microprocessor Supplies - = Voltage Regulator Modules ORDERING INFORMATION DEVICE (1) PACKAGE SO-28 TEMP. RANGE (TJ) 0 - 125°C SC1155CSW.TR SC1155EVB Evaluation Board TYPICAL APPLICATION CIRCUIT Note: (1) Only available in tape and reel packaging. A reel contains 1000 devices. U1 SC1155CSW 1 R1 2k R3 2.7k 2 3 R2 1k C2 0.01 R4 1k C3 0.01 R5 100 C4 0.01 R6 20k C6 0.1 4 5 6 7 C5 0.001 8 C7 0.1 C8 0.01 +5V 9 10 11 12 13 14 IOUT DROOP OCP VHYST VREFB VSENSE AGND...