SC1154 Datasheet, PDF (1/18 Pages) Semtech Corporation – PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS

PROGRAMMABLE SYNCHRONOUS
DC/DC HYSTERETIC CONTROLLER
FOR ADVANCED PROCESSORS
SC1154
PRELIMINARY - March 1, 2000
TEL:[phone] FAX:[phone] 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 (T_J)
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
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