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SC1154CSW PDF даташит

Спецификация SC1154CSW изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS».

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Номер произв SC1154CSW
Описание PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC1154CSW Даташит, Описание, Даташиты
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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SC1154CSW Даташит, Описание, Даташиты
PROGRAMMABLE SYNCHRONOUS
DC/DC HYSTERETIC CONTROLLER
FOR ADVANCED PROCESSORS
PRELIMINARY - March 1, 2000
ABSOLUTE MAXIMUM RATINGS
Parameter
VIN12V
BOOT to DRVGND
BOOT to BOOTLO
Digital Inputs
AGND to DRVGND
LOHIB to AGND
LOSENSE to AGND
IOUTLO to AGND
HISENSE to AGND
VSENSE to AGND
Continuous Power Dissipation, TA = 25°C
Continuous Power Dissipation, TC = 25°C
Operating Junction Temperature
Lead Temperature (Soldering) 10 seconds
Storage Temperature
Symbol
VINMAX
PD
PD
TJ
TL
TSTG
Maximum
14
25
15
-0.3 to +7.3
+0.5V
14
14
14
14
5
1.2
6.25
0 to +125
300
-65 to 150
SC1154
Units
V
V
V
V
V
V
V
V
V
V
W
W
°C
°C
°C
© 2000 SEMTECH CORP.
2
652 MITCHELL ROAD NEWBURY PARK CA 91320









No Preview Available !

SC1154CSW Даташит, Описание, Даташиты
PROGRAMMABLE SYNCHRONOUS
DC/DC HYSTERETIC CONTROLLER
FOR ADVANCED PROCESSORS
SC1154
PRELIMINARY - March 1, 2000
PIN DESCRIPTION
Pin Pin Name Pin Function
1 IOUT Current Out. The output voltage on this pin is proportional to the load current as measured
across the high side MOSFET, and is approximately equal to 2 x RDS(ON) x ILOAD.
2 DROOP Droop Voltage. This pin is used to set the amount of output voltage set-point droop as a
function of load current. The voltage is set by a resistor divider between IOUT and AGND.
3 OCP Over Current Protection. This pin is used to set the trip point for over current protection by a
resistor divider between IOUT and AGND.
4 VHYST Hysteresis Set Pin. This pin is used to set the amount of hysteresis required by a resistor
divider between VREFB and AGND.
5 VREFB Buffered Reference Voltage (from VID circuitry).
6 VSENSE Output Voltage Sense.
7 AGND Small Signal Analog and Digital Ground.
8 SOFTST Soft Start. Connecting a capacitor from this pin to AGND sets the time delay.
9 NC Not connected
10 LODRV Low Drive Control. Connecting this pin to +5V enables normal operation. When LOHIB is
grounded, this pin can be used to control LOWDR.
11 LOHIB Low Side Inhibit. This pin is used to eliminate shoot-thru current.
12 DRVGND Power Ground.
13 LOWDR Low Side Driver Output.
14 DRV Drive Regulator for the MOSFET Drivers.
15 VIN12V 12V Supply.
16 BOOT Bootstrap. This pin is used to generate a floating drive for the high side FET driver.
17 HIGHDR High Side Driver Output.
18 BOOTLO Bootstrap Low. In desktop applications, this pin connects to DRVGND.
19 HISENSE High Current Sense. Connected to the drain of the high side FET, or the input side of a current
sense resistor between the input and the high side FET.
20 LOSENSE Low Current Sense. Connected to the source of the high side FET, or the FET side of a current
sense resistor between the input and the high side FET.
21 IOUTLO This is the sampling capacitors bottom leg. Voltage on this pin is voltage on the LOSENSE pin
when the high side FET is on.
22 INHIBIT Inhibit. If this pin is grounded, the MOSFET drivers are disabled. Usually connected to +5V
through a pull-up resistor.
23 VID4(1) Programming Input (MSB).
24 VID3(1) Programming Input.
25 VID2(1) Programming Input.
26 VID1(1) Programming Input.
27 VID0(1) Programming Input (LSB).
28 PWRGD(1) Power Good. This open collector logic output is high if the output voltage is within 5% of the set
point.
3
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320










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Номер в каталогеОписаниеПроизводители
SC1154CSWPROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORSSemtech Corporation
Semtech Corporation

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