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Semtech Corporation - PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS

Numéro de référence SC1154CSW
Description PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS
Fabricant Semtech Corporation 
Logo Semtech Corporation 





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SC1154CSW fiche technique
PROGRAMMABLE SYNCHRONOUS
DC/DC HYSTERETIC CONTROLLER
FOR ADVANCED PROCESSORS
SC1154
PRELIMINARY - March 1, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1154 is a synchronous-buck switch-mode con-
troller designed for use in single ended power supply
applications where efficiency is the primary concern.
The controller is a hysteretic type, with a user se-
lectable hysteresis. The SC1154 is ideal for imple-
menting DC/DC converters needed to power advanced
microprocessors such as Pentium® ll, in both single
and multiple processor configurations. Inhibit, under-
voltage lockout and soft-start functions are included for
controlled power-up.
SC1154 features include an integrated 5 bit D/A con-
verter, temperature compensated voltage reference,
current limit comparator, over-current protection, and
an adaptive deadtime circuit to prevent shoot-through
of the power MOSFET during switching transitions.
Power good signaling, logic compatible shutdown, and
over-voltage protection are also provided. The inte-
grated D/A converter provides programmability of out-
put voltage from 2.0V to 3.5V in 100mV increments
and 1.3V to 2.05V in 50mV increments with no external
components.
The SC1154 high side driver can be configured as ei-
ther a grounded reference or as a floating bootstrap
driver. High and low side drivers have a peak current
rating of 2 amps.
FEATURES
Programmable hysteresis
5 bit DAC programmable output (1.3V-3.5V)
On-chip power good and OVP functions
Designed to meet latest Intel specifications
Up to 95% efficiency
+1% tolerance over temperature
APPLICATIONS
Server Systems and Workstations
Pentium® II Core Supply
Multiple Microprocessor Supplies
Voltage Regulator Modules
ORDERING INFORMATION
DEVICE(1) PACKAGE
SC1154CSW SO-28
TEMP. RANGE (TJ)
0 - 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
PIN CONFIGURATION
Top View
SIMPLIFIED BLOCK DIAGRAM
(28-Pin SOIC)
© 2000 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
1
652 MITCHELL ROAD NEWBURY PARK CA 91320

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