PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
PRELIMINARY - January 6, 1999
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
廬
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
鈥?/div>
Synchronous design, enables no heatsink solution
鈥?/div>
95% efficiency (switching section)
鈥?/div>
5 bit DAC for output programmability
鈥?/div>
On chip power good function
鈥?/div>
Designed for Intel Pentium
廬
ll requirements
鈥?/div>
1.5V, 2.5V @ 1% for linear section
鈥?/div>
1.265V 鹵 1.5% Reference available
APPLICATIONS
鈥?/div>
Pentium
廬
ll microprocessor supplies
鈥?/div>
Flexible motherboards
鈥?/div>
1.3V to 3.5V microprocessor supplies
鈥?/div>
Programmable triple power supplies
ORDERING INFORMATION
Part Number
(1)
Package
Linear
Voltage
Temp.
Range (T
J
)
SC1185CSW
SC1185ACSW
(2)
SO-24
SO-24
1.5V/2.5V 0擄 to 125擄C
1.5V/2.5V 0擄 to 125擄C
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
(2) SC1185A provides improved output tolerance. See
Output Voltage Table.
PIN CONFIGURATION
BLOCK DIAGRAM
VCC
CS-
CS+
EN
BSTH
Top View
VID4
REF.
DH
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
23
22
21
20
19
18
17
16
15
14
13
GATE2
LDOV
VID0
VID1
VID2
VID3
VID4
VOSENSE
EN
BSTH
BSTL
DL
VID3
VID2
VID1
VID0
D/A
PGNDH
VOSENSE
PWRGOOD
BSTL
DL
(24 Pin SOIC)
LDOS1
FET
CONTROLLER
2.5V/ADJ.
1.265V
REF.
FET
CONTROLLER
1.5V/ADJ.
GATE1
PGNDL
LDOV
REF
GATE2
LDOS2
AGND
Pentium is a registered trademark of Intel Corporation
1
漏 1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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