SC1157
SC1157 is PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS manufactured by SEMTECH.
DESCRIPTION
The SC1157 is a low-cost, full featured, synchronous voltage-mode controller designed for use in single ended power supply applications where efficiency is of primary concern. Synchronous operation allows for the elimination of heat sinks in many applications. The SC1157 is ideal for implementing DC/DC converters needed to power advanced microprocessors such as Pentium® ll (Klamath), in both single and multiple processor configurations. Internal level-shift, high-side drive circuitry, and preset shoot-thru control, allows for use of inexpensive n-channel power switches. SC1157 Features include an integrated 4-bit VID DAC, temperature pensated voltage reference, triangle wave oscillator, current limit parator, frequency shift over-current protection, and an internally pensated error amplifier. The SC1157 operates at a fixed 140KHz, providing an optimum promise between efficiency, external ponent size, and cost.
Features
- = Low cost / full featured
- = Synchronous operation
- = 4 Bit VID DAC programmable output
- = Designed to meet Intel VRM8.2 (Pentium® II)
- = 1.5% Reference APPLICATIONS
- = Pentium® II Core Supply
- = Multiple Microprocessor Supplies
- = Voltage Regulator Modules (VRM)
- = Programmable Power Supplies
- = High Efficiency DC/DC Conversion ORDERING INFORMATION
DEVICE
(1)
(1% tolerance)
PACKAGE
(2)
TEMP. RANGE (TJ) 0
- 125°C
SC1157CS.TR
SO-16NB
Note: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (2) “NB” indicates 150 MIL body.
PIN CONFIGURATION BLOCK DIAGRAM
Top View
VCC CSCS+ SHUTDOWN
CURRENT LIMIT
BSTH
70m V
+ LEVEL SHIFT AND HIGH SIDE...
