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Номер произв SC1152
Описание PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS
Производители Semtech Corporation
логотип Semtech Corporation логотип 



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SC1152 Даташит, Описание, Даташиты
PROGRAMMABLE SYNCHRONOUS DC/DC
SC1152
CONTROLLER FOR ADVANCED PROCESSORS
April 28, 1998
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1152 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
SC1152 is ideal for implementing DC/DC converters
needed to power advanced microprocessors such as
Pentium® ll (Klamath), in both single and multiple pro-
cessor configurations. Internal level-shift, high-side
drive circuitry, and preset shoot-thru control, allows for
use of inexpensive n-channel power switches.
SC1152 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 SC1152 operates at a fixed 200KHz, providing an
optimum compromise between efficiency, external
component size, and cost.
FEATURES
Low cost / full featured
Synchronous operation
5 Bit VID DAC programmable output
On-chip power good and OVP functions
Designed to meet Intel VRM8.1 (Pentium® II)
APPLICATIONS
Pentium® II (Klamath) Core Supply
Multiple Microprocessor Supplies
Voltage Regulator Modules (VRM)
Programmable Power Supplies
High Efficiency DC/DC Conversion
ORDERING INFORMATION
DEVICE(1)
SC1152CS
PACKAGE
SO-20
TEMP. RANGE (TJ)
0 - 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
PIN CONFIGURATION
BLOCK DIAGRAM
Top View
(20-Pin SOIC)
VID4
VID3
VID2
VID1
VID0
VCC
CS(-) CS(+)
1.25V REF
D/A AND
SHUT-
DOWN
LOGIC
CURRENT LIMIT
VCC
70mV +
-
DECODED SHUTDOWN SIGNAL
OSCILLATOR
200 kHz
R
Q
S
VOSENSE
OPEN COLLECTORS
+
-
PWRGOOD
+
-
VCC
+
-
OVP
+
-
ERROR
AMP
-
+
GND
GND
SHUTDOWN
UPPER FET
LEVEL SHIFT
AND DRIVE
SHOOT-THRU
CONTROL
SYNCHRONOUS
FET
DRIVE
BSTH
DH
PGNDH
BSTL
DL
PGNDL
© 1998 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
1
652 MITCHELL ROAD NEWBURY PARK CA 91320









No Preview Available !

SC1152 Даташит, Описание, Даташиты
PROGRAMMABLE SYNCHRONOUS DC/DC
SC1152
CONTROLLER FOR ADVANCED PROCESSORS
April 28, 1998
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Maximum
VCC to GND
PGND to GND
VIN -0.3 to 7
±1
BST to GND
-0.3 to 15
Thermal Resistance
Junction to Case
θJC
30
Thermal Resistance
Junction to Ambient
θJA
90
Operating
Temperature Range
TA
0 to 70
Storage
Temperature Range
TSTG
-65 to +150
Lead Temperature
(Soldering) 10 sec
TLEAD
300
Units
V
V
V
°C/W
°C/W
°C
°C
°C
ELECTRICAL CHARACTERISTICS
Unless specified: VCC = 4.75V to 5.25V; GND = PGND = 0V; FB = VO; 0mV < (CS(+) - CS(-)) < 60mV; TJ = 25oC
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Output Voltage
IO = 2A(1)
See Table 1.
Supply Voltage
VCC
4.2 7 V
Supply Current
Load Regulation
Line Regulation
VCC = 5.0
IO = 0.3A to 15A(1)
All VID codes(1)
5 mA
1%
0.5 %
Gain (AOL)
Current Limit Voltage
VOSENSE to VO
35 dB
60 70 80 mV
Oscillator Frequency
180 200 220 kHz
Oscillator Max Duty Cycle
90 95
%
DH Sink/Source Current
DL Sink/Source Current
OVP Threshold Voltage
BSTH - DH = 4.5V, DH - PGNDH = 2V
BSTL - DL = 4.5V, DL - PGNDL = 2V
1
1
120
A
A
%
OVP Source Current
Power Good Threshold
Voltage
VOVP = 3V
10 mA
90 110 %
Dead Time
50 100
ns
NOTE:
(1) Specification refers to application circuit (Figure 1.).
© 1998 SEMTECH CORP.
2
652 MITCHELL ROAD NEWBURY PARK CA 91320









No Preview Available !

SC1152 Даташит, Описание, Даташиты
PROGRAMMABLE SYNCHRONOUS DC/DC
SC1152
CONTROLLER FOR ADVANCED PROCESSORS
April 28, 1998
PIN DESCRIPTION
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin Name
GND
VCC
OVP
PWRGOOD(1)
CS(-)
CS(+)
PGNDH
DH
NC
PGNDL
DL
BSTL
BSTH
SHUTDOWN(1)
VOSENSE
VID4(1)
VID3(1)
VID2(1)
VID1(1)
VID0(1)
Pin Function
Small Signal Analog and Digital Ground
Chip Supply Voltage
High Signal Out if VO > Setpoint + 20%
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
Not Connected
Power Ground for Low Side Switch
Low Side Driver Output
Vcc for Low Side Driver (Boost)
Vcc for High Side Driver (Boost)
Logic Low shuts down the converter
Top end of internal feedback chain
Programming Input (MSB)
Programming Input
Programming Input
Programming Input
Programming Input (LSB)
NOTE:
(1) All logic level inputs and outputs are open collector TTL compatible.
PIN CONFIGURATION
© 1998 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA 91320










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