sc1157 Semtech Corporation, sc1157 Datasheet

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sc1157

Manufacturer Part Number
sc1157
Description
Programmable Synchronous Dc/dc Controller For Advanced Processors
Manufacturer
Semtech Corporation
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
sc1157CS
Manufacturer:
SEMTECH
Quantity:
351
Part Number:
sc1157CS.TR
Quantity:
5 900
Preliminary - August 7, 2000
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
cessor 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 V
temperature compensated voltage reference, triangle
wave oscillator, current limit comparator, frequency
shift over-current protection, and an internally compen-
sated error amplifier.
The SC1157 operates at a fixed 140KHz, providing an
optimum compromise between efficiency, external
component size, and cost.
PIN CONFIGURATION
© 2000 SEMTECH CORP.
®
ll (Klamath), in both single and multiple pro-
(16-Pin SOIC)
Top View
PROGRAMMABLE SYNCHRONOUS DC/DC
CONTROLLER FOR ADVANCED PROCESSORS
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
VOSENSE
ID
DAC,
VID3
VID2
VID1
VID0
GND
REF
REF
D/A
FEATURES
APPLICATIONS
ORDERING INFORMATION
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
(2) “NB” indicates 150 MIL body.
BLOCK DIAGRAM
SC1157CS.TR
=
=
=
=
=
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652 MITCHELL ROAD NEWBURY PARK CA 91320
DEVICE
Low cost / full featured
Synchronous operation
4 Bit V
(1% tolerance)
Designed to meet Intel VRM8.2 (Pentium
1.5% Reference
Pentium® II Core Supply
Multiple Microprocessor Supplies
Voltage Regulator Modules (VRM)
Programmable Power Supplies
High Efficiency DC/DC Conversion
VCC
+
-
ERROR
AMP
ID
CS-
OSCILLATOR
(1)
DAC programmable output
70mV
CS+
-
+
Pentium is a registered trademark of Intel Corporation
+
-
PACKAGE
CURRENT
LIMIT
SO-16NB
R
S
Q
SHUTDOWN
(2)
TEMP. RANGE (T
LEVEL SHIFT AND
HIGH SIDE DRIVE
SYNCHRONOUS
MOSFET DRIVE
SHOOT-THRU
CONTROL
0 - 125°C
SC1157
®
II)
BSTH
DH
BSTL
DL
PGND
J
)
1

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sc1157 Summary of contents

Page 1

... SC1157 features include an integrated 4-bit V temperature compensated voltage reference, triangle wave oscillator, current limit comparator, frequency shift over-current protection, and an internally compen- sated error amplifier. The SC1157 operates at a fixed 140KHz, providing an optimum compromise between efficiency, external component size, and cost. PIN CONFIGURATION Top View (16-Pin SOIC) © ...

Page 2

... LEAD ESD ; 0mV < (CS(+) - CS(-)) < 60mV CONDITIONS = 5.0 (1) ( =1mA - DH = 4.5V PGND = 4.5V PGND = 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1157 Maximum Units -0 ± -0 °C/W 130 °C °C -65 to +150 °C 300 °C 1.5 ...

Page 3

... Vcc for Low Side Driver (Boost) Vcc for High Side Driver (Boost) Logic Low shuts down the converter; High or open for normal operation. Top end of internal feedback chain Programming Input (MSB) Programming Input Programming Input Programming Input (LSB) 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1157 3 ...

Page 4

... MITCHELL ROAD NEWBURY PARK CA 91320 SC1157 MIN TYP MAX UNITS 1.287 1.300 1.313 V 1.337 1.350 1.364 1.386 1.400 1.414 1.436 1.450 1.465 1.485 1 ...

Page 5

... Preliminary - August 7, 2000 OUTLINE DRAWING SO-16 LAND PATTERN SO-16 ECN00-1243 © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1157 Jedec MS-012AC 5 ...

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