SC1186
SC1186 is Programmable Synchronous DC/DC Converter / Dual LDO Controller manufactured by SEMTECH.
Description
Features
The SC1186 bines 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 & III.
The SC1186 switching section Features an integrated 5 bit D/A converter, latched drive output for enhanced noise immunity, pulse by pulse current limiting and logic patible shutdown. The SC1186 switching section operates at a fixed frequency of 140k Hz, providing an optimum promise between size, efficiency and cost in the intended application areas. The integrated D/A converter provides programmability of output voltage from 2.0V to 3.5V in 100m V increments and 1.30V to 2.05V in 50m V increments with no external ponents.
Synchronous design, enables no heatsink solution 95% efficiency (switching section) 5 bit DAC for output programmability Designed for Intel Pentium® ll & III requirements 1.5V, 2.5V short circuit protected linear controllers 1.265V ± 1.5% Reference available
Applications
Pentium® ll & III microprocessor supplies Flexible motherboards 1.3V to 3.5V microprocessor supplies Programmable triple power supplies
The SC1186 linear sections are low dropout regulators with short circuit protection, supplying 1.5V for GTL bus and 2.5V for non-GTL I/O. The Reference voltage is made available for external linear regulators.
Typical Application Circuit
12V
+
5V
47u F
0.1u F
+ 1500u F x4
VID0 VID1 VID2 VID3 VID4 EN
0.1u F
3.3V
5 VCC 7 LDOEN 22 VID0 21 VID1 20 VID2 19 VID3 18 VID4 16 EN 1 AGND 23 LDOV 24 GATE2 4 LDOS2
CS+ CSVOSENSE BSTH DH BSTL
DL PGNDH PGNDL
REF GATE1 LDOS1
SC1186CS
9 8 0.1u F 17 15 11 14 13 10 12 6 2 3
IRLR3103N 2R2
IRLR3103N 2R2
0.1u F 1.9u H
1k 12V
8...
