SC1182CSW Semtech Corporation, SC1182CSW Datasheet

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SC1182CSW

Manufacturer Part Number
SC1182CSW
Description
Manufacturer
Semtech Corporation
Datasheet

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Part Number:
SC1182CSW
Quantity:
55
Part Number:
SC1182CSW
Manufacturer:
MITSUMI
Quantity:
948
August 25, 1998
DESCRIPTION
The SC1182/3 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
Deschutes.
The SC1182/3 switching section features an integrat-
ed 5 bit D/A converter, pulse by pulse current limiting,
integrated power good signaling, and logic compatible
shutdown. The SC1182/3 switching section 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 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 SC1182/3 linear sections are low dropout regula-
tors. The SC1182 supplies 1.5V for GTL bus and 2.5V
for non-GTL I/O.
For the SC1183 both LDO’s are adjustable.
PIN CONFIGURATION
© 1998 SEMTECH CORP.
PWRGOOD
PGNDH
PGNDL
GATE1
LDOS1
LDOS2
AGND
OVP
VCC
CS+
CS-
DH
(24 Pin SOIC)
10
11
12
Top View
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
GATE2
LDOV
VID0
VID1
VID2
VID3
VID4
VOSENSE
EN
BSTH
BSTL
DL
®
II (Klamath) or
BLOCK DIAGRAM
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
REF.
CONTROLLER
2.5V/ADJ.
FET
FEATURES
APPLICATIONS
ORDERING INFORMATION
Part Number
SC1182CSW
SC1183CSW
Note:
(1) Add suffix ‘TR’ for tape and reel.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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
ments
1.5V, 2.5V or Adj. @ 1% for linear section
Pentium
Flexible motherboards
1.3V to 3.5V microprocessor supplies
Programmable triple power supplies
1.265V
LDOV
REF.
®
(1)
ll or Deschutes microprocessor supplies
Pentium is a registered trademark of Intel Corporation
Package
SO-24
SO-24
CONTROLLER
1.5V/ADJ.
FET
1.5V/2.5V 0° to 125°C
Voltage
®
Linear
Adj.
ll VRM8.1 require-
SC1182/3
0° to 125°C
Range (T
Temp.
J
1
)

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SC1182CSW Summary of contents

Page 1

... Adj for linear section APPLICATIONS Pentium Flexible motherboards 1.3V to 3.5V microprocessor supplies Programmable triple power supplies ORDERING INFORMATION Part Number SC1182CSW SC1183CSW Note: (1) Add suffix ‘TR’ for tape and reel. BLOCK DIAGRAM REF. FET 1.265V CONTROLLER REF. ...

Page 2

August 25, 1998 ABSOLUTE MAXIMUM RATINGS Parameter V to GND CC 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 ...

Page 3

August 25, 1998 PIN DESCRIPTION Pin Pin Name Pin Function 1 AGND Small Signal Analog and Digital Ground 2 GATE1 Gate Drive Output LDO1 3 LDOS1 Sense Input for LDO1 4 LDOS2 Sense Input for LDO2 5 VCC Input Voltage ...

Page 4

August 25, 1998 OUTPUT VOLTAGE Unless specified 4.75V to 5.25V; GND = PGND = 0V PARAMETER CONDITIONS Output Voltage Application circuit O © 1998 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW ...

Page 5

August 25, 1998 APPLICATION CIRCUIT © 1998 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW DROPOUT REGULATOR CONTROLLER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1182/3 5 ...

Page 6

August 25, 1998 MATERIALS LIST Qty. Reference Part/Description 4 C1,C5,C13, 0.1µF Ceramic C18 6 C2,C3,C14- 1500µF/6.3V C17 6 C9-C12, 330µF/6.3V C21, C22 1 L1 4µH 4 Q1,Q2,Q3, See notes 2.32k , 1%, 1/8W 1 ...

Page 7

August 25, 1998 95% 90% 85% 80% 3.5V Std 3.5V Sync 3.5V Sync Lo Rds 75% 70 (Amps) Typical Efficiency at Vo=3.5V 95% 90% 85% 80% 2.5V Std 2.5V Sync 2.5V Sync Lo Rds ...

Page 8

August 25, 1998 LAYOUT GUIDELINES Careful attention to layout requirements are necessary for successful implementation of the SC1182/3 PWM controller. High currents switching at 200kHz are pre- sent in the application and their effect on ground plane voltage differentials must ...

Page 9

August 25, 1998 4) The Output Capacitor(s) (Cout) should be located as close to the load as possible, fast transient load currents are supplied by Cout only, and connections between Cout and the load must be short, wide cop- per ...

Page 10

August 25, 1998 COMPONENT SELECTION SWITCHING SECTION OUTPUT CAPACITORS - Selection begins with the most critical component. Because of fast transient load current requirements in modern microprocessor core supplies, the output capacitors must supply all transient load current requirements until ...

Page 11

August 25, 1998 FET type ( ( DS(on) BUK556H 22 2.48 IRL2203 7.0 0.79 Si4410 13.5 1.53 BOTTOM FET - Bottom FET losses are almost entirely due to conduction. The body diode is forced into con- ...

Page 12

August 25, 1998 OUTLINE DRAWING © 1998 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW DROPOUT REGULATOR CONTROLLER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1182/3 JEDEC MS-013AD B17104B 12 ...

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