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SC1157

Features: •Low cost / full featured•Synchronous operation•4 Bit VID DAC programmable output (1% tolerance)•Designed to meet Intel VRM8.2 (Pentium® II)•1.5% ReferenceApplication•Pentium® II Core Supply•Multiple Microprocessor Supplies•Voltage ...

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SeekIC No. : 004485429 Detail

SC1157: Features: •Low cost / full featured•Synchronous operation•4 Bit VID DAC programmable output (1% tolerance)•Designed to meet Intel VRM8.2 (Pentium® II)•1.5% Referenc...

SC1157 Data Sheet

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Part Number:
SC1157
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2025/12/26

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Product Details

Description



Features:

•Low cost / full featured
•Synchronous operation
•4 Bit VID DAC programmable output (1% tolerance)
•Designed to meet Intel VRM8.2 (Pentium® II)
•1.5% Reference




Application

•Pentium® II Core Supply
•Multiple Microprocessor Supplies
•Voltage Regulator Modules (VRM)
•Programmable Power Supplies
•High Efficiency DC/DC Conversion




Pinout

Connection Diagram


Specifications

Parameter Symbol Maximum Units
VCC to GND VIN -0.3 to 7 V
PGND to GND   ± 1 V
BST to GND   -0.3 to 15 V
Thermal Resistance Junction to Case JC 30 °C/W
Thermal Resistance Junction to Ambient JA 130 °C/W
Operating Temperature Range TA 0 to +70 °C
Storage Temperature Range TSTG -65 to +150 °C
Lead Temperature (Soldering) 10 seconds TL 300 °C
ESD Rating (Human Body Model) ESD 1.5 kv



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 compensated voltage reference, triangle wave oscillator, current limit comparator, frequency shift over-current protection, and an internally compensated error amplifier.

The SC1157 operates at a fixed 140KHz, providing an optimum compromise between efficiency, external component size, and cost.




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