Datasheet SC1150 Datasheet (SEMTECH)

© 1998 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA

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查询SC1150供应商

PROGRAMMABLE DC/DC
CONTROLLER

March 11, 1998

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DESCRIPTION

The SC1150 voltage mode controller contains most of
the circuitry necessary to implement a DC/DC converter
for powering the Intel Pentium® Pro microprocessor,
both in single and multiple processor configurations.

The SC1150 features an integrated D/A converter,
pulse by pulse current limiting, integrated power good
signaling, logic compatible shutdown and on-board over
voltage protection (OVP).

The SC1150 operates at a fixed frequency of 200kHz,
providing an optimum compromise between size, effi­ciency and cost in the intended application areas.

The integrated D/A converter provides programmability
of output voltage from 2.0V to 3.5V in 100mV incre­ments with no external components. Both the range
and the increment value may be changed by adding ex­ternal components.

The SC1150 provides an OVP output which can be
used to trigger a crowbar circuit for true over voltage
protection.

SC1150

FEATURES

• 85% efficiency

• 4 bit DAC for output programmability

• On chip power good and OVP functions

• Meets Intel Pentium

APPLICATIONS

• Pentium

• Pentium

®

Pro Processor supplies

®

Pro Processor VRM modules

• 2.0V to 3.5V microprocessor supplies

• Programmable power supplies

ORDERING INFORMATION

DEVICE

SC1150CS SO-16 0 - 125°C
Note:

(1) Add suffix ‘TR’ for tape and reel.

(1)

PACKAGE TEMP RANGE (TJ)

®

Pro VRM8.0 specifications

BLOCK DIAGRAM

CSm

VCC

1.25V REF

VID3
VID2

D/A

VID1
VID0

VOSENSE

PWRGOOD

VCC

OVP

1.00V to

1.75V

VCC

+

-

+

-

+

-

OSCILLATOR

GND FB

CSp

CURRENT LIMIT

-

70mV

+

+

-

ERROR
AMP

PIN CONFIGURATION

GND
VCC
OVP

PWRGOOD

CSm

CSp

1
2
3
4
5
6
7
8

ABSOLUTE MAXIMUM RATINGS

Parameter Symbol Maximum Units

BST

LEVEL SHIFT

R

Q

S

-

+

AND DRIVE

DH

PGND

B16997B

16

VID0

15

VID1

14

VID2

13

VID3

12

FB

11

VOSENSE

10

SHUTDOWNPGND

9

BSTDH

VCC to GND V

IN

-0.3 to 7 V
PGND to GND ± 1 V
BST to GND -0.3 to 15 V
Operating

Temperature Range
Storage

Temperature Range
Lead Temperature

(Soldering) 10 sec

T

T

T

A

STG

LEAD

0 to 70 °C

-65 to +150 °C

300 °C

Pentium is a registered trademark of Intel Corporation

1

© 1998 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA

March 11, 1998

ELECTRICAL CHARACTERISTICS

PROGRAMMABLE DC/DC
CONTROLLER

SC1150

Unless specified: VCC = 4.75V to 5.25V; GND = PGND = 0V; V

PARAMETER CONDITIONS VID

= VO; 0mV < (CSp-CSm) < 60mV; TA = 25oC

OSENSE

MIN TYP MAX UNITS

3210

Output Voltage

(2)

IO = 2A in Application circuit 16935E 1111 1.980 2.000 2.020 V

1110 2.079 2.100 2.121
1101 2.178 2.200 2.222
1100 2.277 2.300 2.323
1011 2.376 2.400 2.424
1010 2.475 2.500 2.525
1001 2.574 2.600 2.626
1000 2.673 2.700 2.727
0111 2.772 2.800 2.828
0110 2.871 2.900 2.929
0101 2.970 3.000 3.030
0100 3.069 3.100 3.131
0011 3.168 3.200 3.232
0010 3.267 3.300 3.333
0001 3.366 3.400 3.434
0000 3.465 3.500 3.535

Load Regulation IO = 0.3A to 13A

(1)

xxxx 1 %
Line Regulation xxxx 0.5 %
UV Lockout xxxx 4.2 V
Current Limit Voltage xxxx 60 70 80 mV
Oscillator Frequency xxxx 180 200 220 kHz
Oscillator Max Duty

xxxx 90 95 %
Cycle

DH Sink/Source Current BST - DH = 4.5V, DH - PGND = 2V xxxx 1 A
Output Voltage Tempco xxxx 65 ppm/oC

NOTES:

(1) Low output currents, below the continuous conduction threshold will cause an increase in output voltage
beyond the load regulation limit. For Application circuit 16935E see the regulation curve on sheet 5.
(2) All VID codes not specifically listed here are invalid and cause shutdown exactly as if the shutdown pin had
been asserted. xxxx refers to any valid VID code.

2

© 1998 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA

March 11, 1998

PIN DESCRIPTION

Pin # Pin Name Pin Function

GND

1
2
3
4

5
6
7
8

9
10
11
12
13
14
15
16

V

CC

(1)

OVP
PWRGOOD

CSm
CSp
PGND
DH
BST
SHUTDOWN
VOSENSE
FB

(1)

VID3

(1)

VID2

(1)

VID1

(1)

VID0

(1)

(1)

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
High side Driver Output
Vcc for high side Driver
Logic low shuts down the converter
Top end of internal feedback chain
Voltage Feedback Input
Programming Input (MSB)
Programming Input
Programming Input
Programming Input (LSB)

PROGRAMMABLE DC/DC
CONTROLLER

GND

VCC
OVP

PWRGOOD

CSm

CSp

SC1150

1
2
3
4
5
6
7
8

16

VID0

15

VID1

14

VID2

13

VID3

12

FB

11

VOSENSE

10

SHUTDOWNPGND

9

BSTDH

NOTE:

(1) All logic level inputs and outputs are open collector TTL compatible

3

© 1998 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA

March 11, 1998

APPLICATION CIRCUIT

5V IN

PROGRAMMABLE DC/DC
CONTROLLER

R1

Q1

BUK556

4uH

L1

5mOhm

C6
1000uF

C8
1000uF

C10
1000uF

SC1150

VCCP

0.1uF

+

C5
1000uF

REF 16935E

+

C1

C2

1000uF

1000uF

+

C3

+

C4

1000uF

12V IN

OVP
VID0
VID1
VID2
VID3
SHUTDOWN

PWRGD

CSp

CSm

BST

PGND

PSR16C30CT

6
5
11
4
12

FB

9
8

DH

7

D1

R3

2.32k
C11

0.1uF

R4

1.00k

R2

+

10k

R5
10

2

3
16
15
14
13
10

1

U1

VCC
OVP
VID0
VID1
VID2
VID3
SHUTDOWN
GND

SC1150CS

C13

0.1uF

VOSENSE

PWRGOOD

+

C7
1000uF

+

+

C9
1000uF

+

C12

0.1uF

MATERIALS LIST

Quantity Reference Part/Description Vendor Notes
4 C1,C11-C13 0.1µF Ceramic Various
9 C2-C10 1000µF/6.3V SANYO MV-GX or equiv. Low ESR
1 D1 PSR16C30CT PHOTRON
1 L1 4µH 8 Turns 16AWG on MICROMETALS T50-52D core
1 Q1 BUK556 PHILIPS
1 R1
1 R2
1 R3
1 R4
1 R5

5mΩ
10kΩ, 5%, 1/8W

2.32kΩ, 1%, 1/8W
1kΩ, 1%, 1/8W
10Ω, 5%, 1/8W

IRC OAR-1 Series
Various
Various
Various
Various

1 U1 SC1150CS SEMTECH

Logic level FET, ≤22mΩ, 30V

4

© 1998 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA

March 11, 1998

CHARACTERISTIC CURVES

PROGRAMMABLE DC/DC
CONTROLLER

SC1150

SC1150 Efficiency in Application circuit 16935E

100.0%

95.0%

90.0%

85.0%

Efficiency

80.0%

75.0%

70.0%

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0

Output Current (Amps)

3.50V Set

3.00V Set

2.40V Set

2.00V Set

Application circuit 16935E Transient Response, 3.1V, 0.3A to 10A

Vo at Io=300mA steady state

Application circuit 16935E Ripple, 3.1V, 10A out

SC1150 Regulation in Application circuit 16935E

0.050

0.040

0.030

0.020

Vo at Io=10A steady state

Steady state voltage
levels are superimposed
for reference.

0.010

0.000

-0.010

Voltage change (V) normalized at Io=2A

-0.020

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0

Output Current (Amps)

5

© 1998 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA

March 11, 1998

OUTLINE DRAWING SO-16

PROGRAMMABLE DC/DC
CONTROLLER

SC1150

LAND PATTERN SO-16

6