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SC1183CSW, SC1185, SC1185ACS

Table of contents:
Info of SC1183CSW
Info of SC1185
Info of SC1185ACS

SC1183CSW, SC1185, SC1185ACS Selling Leads, Datasheet

MFG:SEMTECH Package Cooled:SOP24 D/C:0315+

SC1183CSW, SC1185, SC1185ACS Datasheet download

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Part Number: SC1183CSW

MFG: SEMTECH

Package Cooled: SOP24

D/C: 0315+

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SC1185 General 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 converter 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 components.

The SC1185 linear sections are low dropout regulators supplying 1.5V for GTL bus and 2.5V for non-GTL I/O. The Reference voltage is made available for external linear regulators.

SC1185 Maximum Ratings

Parameter	Symbol	Maximum	Units
VCC to GND	V_IN	-0.3 to7	V
PGND to GND		± 1	V
BST to GND		-0.3 to 15	V
Operating Temperature Range	T_A	0 to +70	°C
Junction Temperature Range	T_J	0 to +125	°C
Storage Temperature Range	T_STG	-65 to +150	°C
Lead Temperature (Soldering) 10 seconds	T_L	300	°C
Thermal Impedance Junction to Ambient	_JA	80	°C/W
Thermal Impedance Junction to Case	_JC	25	°C/W

SC1185 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

SC1185 Typical Application

• Pentium® ll microprocessor supplies
• Flexible motherboards
• 1.3V to 3.5V microprocessor supplies
• Programmable triple power supplies

SC1185 Connection Diagram

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