SC1153CSW.TR

Manufacturer Part NumberSC1153CSW.TR
DescriptionPROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS
ManufacturerSemtech Corporation
SC1153CSW.TR datasheet
 
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PRELIMINARY - October 3, 2000
DESCRIPTION
The SC1153 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
SC1153 is ideal for implementing DC/DC converters
needed to power advanced microprocessors, such as
®
Pentium
lll, in both single and multiple processor con-
figurations. Internal level-shift, high-side drive circuitry,
and preset shoot-thru control, allows for use of inex-
pensive n-channel power switches.
SC1153 features include an integrated 5-bit VID DAC,
temperature compensated voltage reference, triangle
wave oscillator, current limit comparator, frequency
shift over-current protection, and an accessible, inter-
nally compensated error amplifier. Power good signal-
ing, logic compatible shutdown, and over voltage pro-
tection are also provided.
The SC1153 operates at a fixed 200KHz, providing an
optimum compromise between efficiency, external
component size, and cost.
PIN CONFIGURATION
Top View
(20-Pin SOIC)
© 2000 SEMTECH CORP.
PROGRAMMABLE SYNCHRONOUS DC/DC
CONTROLLER FOR ADVANCED PROCESSORS
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
FEATURES
=
Low cost / full featured
=
Synchronous operation
=
5 Bit VID programmable output
=
On-chip power good and OVP functions
=
Designed to meet Intel VRM 8.4 (Pentium
=
1.3V to 3.5V Range, 1% tolerance
APPLICATIONS
=
®
Pentium
IlI Core Supply
=
Multiple Microprocessor Supplies
=
Voltage Regulator Modules (VRM)
=
Programmable Power Supplies
=
High Efficiency DC/DC Conversion
ORDERING INFORMATION
(1)
DEVICE
SC1153CSW.TR
Note:
(1) Only available in tape and reel packaging. A reel
contains 1000 devices.
BLOCK DIAGRAM
VCC CS-
CS+
CURRENT LIMIT
1.25V REF
70mV
VID4
VID3
D/A
VID2
OSCILLATOR
VID1
VID0
200kHz
VOSENSE
OPEN COLLECTORS
PWRGOOD
VCC
ERROR
AMP
OVP
GND
Pentium is a registered trademark of Intel Corporation
652 MITCHELL ROAD NEWBURY PARK CA 91320
SC1153
®
IlI)
PACKAGE
TEMP. RANGE (T
)
J
SO-20
0 - 125°C
SHUTDOWN
BSTH
UPPER FET
LEVEL SHIFT
DH
AND DRIVE
R
PGNDH
Q
S
SHOOT-THRU
CONTROL
BSTL
SYNCHRONOUS
DL
FET DRIVE
PGNDL
1

SC1153CSW.TR Summary of contents

  • Page 1

    ... IlI Core Supply = Multiple Microprocessor Supplies = Voltage Regulator Modules (VRM) = Programmable Power Supplies = High Efficiency DC/DC Conversion ORDERING INFORMATION (1) DEVICE SC1153CSW.TR Note: (1) Only available in tape and reel packaging. A reel contains 1000 devices. BLOCK DIAGRAM VCC CS- CS+ CURRENT LIMIT 1.25V REF 70mV VID4 VID3 ...

  • Page 2

    PRELIMINARY - October 3, 2000 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Maximum V to GND PGND to GND BST to GND Thermal Resistance Junction to Case JC Thermal Resistance Junction to Ambient JA Operating T A Temperature Range ...

  • Page 3

    PRELIMINARY - October 3, 2000 PIN DESCRIPTION Pin # Pin Name 1 GND 2 VCC 3 OVP (1) 4 PWRGOOD 5 CS(-) 6 CS(+) 7 PGNDH PGNDL BSTL 13 BSTH (1) 14 ...

  • Page 4

    PRELIMINARY - October 3, 2000 APPLICATION CIRCUIT 10k 1000uF 0.1uF 1000uF 1000uF R5 10 12V IN OVP VID0 20 VID1 19 VID2 18 VID3 17 VID4 14 10 C13 0.1uF ...

  • Page 5

    PRELIMINARY - October 3, 2000 OUTPUT VOLTAGE TABLE Unless specified 5.00V; GND = PGND = 0V PARAMETER Output Voltage Application Circuit O (Figure 1) © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS ...

  • Page 6

    PRELIMINARY - October 3, 2000 CHARACTERISTIC CURVES SC1153 Efficiency in Application Circuit (Figure 1). 100% 95% 90% 85% 80% 75% 70 SC1153 Regulation in Application Circuit (Figure 1 -10 -15 -20 - ...

  • Page 7

    PRELIMINARY - October 3, 2000 OUTLINE DRAWING SO-20 THEORY OF OPERATION The voltage at the VOSENSE pin is applied, through the internal precision resistor feedback chain, to the inverting input of the error amplifier. The non-inverting input of the error ...