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SC1185ACSW PDF даташит

Спецификация SC1185ACSW изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER/ DUAL LOW DROPOUT REGULATOR CONTROLLER».

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Номер произв SC1185ACSW
Описание PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER/ DUAL LOW DROPOUT REGULATOR CONTROLLER
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC1185ACSW Даташит, Описание, Даташиты
PRELIMINARY - January 6, 1999
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
SC1185
SC1185A
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1185 combines a synchronous voltage mode
controller with two low-dropout linear regulators
providing most of the circuitry necessary to
implement three DC/DC converters for powering
advanced microprocessors such as Pentium® II .
The SC1185 switching section features an integrated
5 bit D/A converter, pulse by pulse current limiting,
integrated power good signaling, and logic compatible
shutdown. The SC1185 switching section operates at
a fixed frequency of 140kHz, providing an optimum
compromise between size, efficiency and cost in the
intended application areas. The integrated D/A con-
verter provides programmability of output voltage
from 2.0V to 3.5V in 100mV increments and 1.30V to
2.05V in 50mV increments with no external compo-
nents.
The SC1185 linear sections are low dropout regula-
tors supplying 1.5V for GTL bus and 2.5V for non-
GTL I/O. The Reference voltage is made available for
external linear regulators.
FEATURES
Synchronous design, enables no heatsink solution
95% efficiency (switching section)
5 bit DAC for output programmability
On chip power good function
Designed for Intel Pentium® ll requirements
1.5V, 2.5V @ 1% for linear section
1.265V ± 1.5% Reference available
APPLICATIONS
Pentium® ll microprocessor supplies
Flexible motherboards
1.3V to 3.5V microprocessor supplies
Programmable triple power supplies
ORDERING INFORMATION
Part Number(1)
Package
Linear
Voltage
Temp.
Range (TJ)
SC1185CSW
SO-24 1.5V/2.5V 0° to 125°C
SC1185ACSW(2) SO-24 1.5V/2.5V 0° to 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
(2) SC1185A provides improved output tolerance. See
Output Voltage Table.
PIN CONFIGURATION
Top View
AGND
GATE1
LDOS1
LDOS2
VCC
REF
PWRGOOD
CS-
CS+
PGNDH
DH
PGNDL
1
2
3
4
5
6
7
8
9
10
11
12
24 GATE2
23 LDOV
22 VID0
21 VID1
20 VID2
19 VID3
18 VID4
17 VOSENSE
16 EN
15 BSTH
14 BSTL
13 DL
(24 Pin SOIC)
BLOCK DIAGRAM
VCC CS- CS+
VID4
VID3
VID2
VID1
VID0
VOSENSE
PWRGOOD
REF.
D/A
LDOS1
GATE1
FET
CONTROLLER
2.5V/ADJ.
1.265V
REF.
EN
FET
CONTROLLER
1.5V/ADJ.
BSTH
DH
PGNDH
BSTL
DL
PGNDL
LDOV
REF
GATE2 LDOS2 AGND
© 1999 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
1
652 MITCHELL ROAD NEWBURY PARK CA 91320









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SC1185ACSW Даташит, Описание, Даташиты
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
SC1185
SC1185A
PRELIMINARY - January 6, 1999
ABSOLUTE MAXIMUM RATINGS
Parameter
VCC to GND
PGND to GND
BST to GND
Operating Temperature Range
Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 seconds
Thermal Impedance Junction to Ambient
Thermal Impedance Junction to Case
Symbol
VIN
TA
TJ
TSTG
TL
θJA
θJC
Maximum
-0.3 to +7
±1
-0.3 to +15
0 to +70
0 to +125
-65 to +150
300
80
25
Units
V
V
V
°C
°C
°C
°C
°C/W
°C/W
ELECTRICAL CHARACTERISTICS
Unless specified: VCC = 4.75V to 5.25V; GND = PGND = 0V; VOSENSE = VO; 0mV < (CS+-CS-) < 60mV; LDOV = 11.4V to 12.6V; TA = 0 to 70°C
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Switching Section
Output Voltage
Supply Voltage
IO = 2A in Application Circuit
VCC
See Output Voltage Table
4.5 7 V
Supply Current
VCC = 5.0V
8 15 mA
Load Regulation
Line Regulation
IO = 0.8A to 15A
1
±0.15
%
%
Current Limit Voltage
60 70 85 mV
Oscillator Frequency
125 140 160 kHz
Oscillator Max Duty Cycle
90 95
%
Peak DH Sink/Source Current
BSTH-DH = 4.5V, DH-PGNDH = 3.1V 1
DH-PGNDH = 1.5V 100
A
mA
Peak DL Sink/Source Current
BSTL-DL = 4.5V, DL-PGNDL = 3.1V 1
DL-PGNDL = 1.5V 100
A
mA
Gain (AOL)
VID Source Current
VID Leakage
Power good threshold voltage
Dead time
Linear Sections
Quiescent current
Output Voltage LDO1
Output Voltage LDO2
Reference Voltage
Gain (AOL)
Load Regulation
Line Regulation
Output Impedance
Gate Pulldown Impedance
VOSENSE Impedance
VOSENSE to VO
VIDx 2.4V
VIDx = 5V
35
1 10
10
88 112
40 100
dB
µA
µA
%
ns
LDOV = 12V
Iref 100µA
LDOS (1,2) to GATE (1,2)
IO = 0 to 8A
VGATE = 6.5V
GATE(1,2)-AGND;VCC=LDOV=0V
5
2.469 2.500 2.531
1.481 1.500 1.519
1.246 1.265 1.284
90
0.3
0.3
1 1.5
80 300 750
10
mA
V
V
V
dB
%
%
k
k
k
2
© 1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320









No Preview Available !

SC1185ACSW Даташит, Описание, Даташиты
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
SC1185
SC1185A
PRELIMINARY - January 6, 1999
PIN DESCRIPTION
Pin Pin Name
1 AGND
2 GATE1
3 LDOS1
4 LDOS2
5 VCC
6 REF
7 PWRGOOD(1)
8 CS-
9 CS+
10 PGNDH
11 DH
12 PGNDL
13 DL
14 BSTL
15 BSTH
16 EN(1)
17 VOSENSE
18 VID4(1)
19 VID3(1)
20 VID2(1)
21 VID1(1)
22 VID0(1)
23 LDOV
24 GATE2
Pin Function
Small Signal Analog and Digital Ground
Gate Drive Output LDO1
Sense Input for LDO1
Sense Input for LDO2
Input Voltage
Buffered Reference Voltage output
Open collector logic output, high if VO
within 10% of setpoint
Current Sense Input (negative)
Current Sense Input (positive)
Power Ground for High Side Switch
High Side Driver Output
Power Ground for Low Side Switch
Low Side Driver Output
Supply for Low Side Driver
Supply for High Side Driver
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
Programming Input (LSB)
+12V for LDO section
Gate Drive Output LDO2
Top View
AGND
GATE1
LDOS1
LDOS2
VCC
REF
PWRGOOD
CS-
CS+
PGNDH
DH
PGNDL
1
2
3
4
5
6
7
8
9
10
11
12
24 GATE2
23 LDOV
22 VID0
21 VID1
20 VID2
19 VID3
18 VID4
17 VOSENSE
16 EN
15 BSTH
14 BSTL
13 DL
(24 Pin SOIC)
Note:
(1) All logic level inputs and outputs are open
collector TTL compatible.
© 1999 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA 91320










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Semtech Corporation

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