PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER WITH LOW DROPOUT
REGULATOR CONTROLLER
October 25, 1999
SC1172/3
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1172/3 combines a synchronous voltage mode
controller with a low-dropout linear regulator providing
most of the circuitry necessary to implement two DC/DC
converters for powering advanced microprocessors such
廬
as Pentium II (Klamath) or Deschutes.
The SC1172/3 switching section features an integrated 5
bit D/A converter, pulse by pulse current limiting,
integrated power good signaling, and logic compatible
shutdown. The SC1172/3 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 components.
The SC1172/3 linear section is a high performance
positive voltage regulator design for either the GTL bus
supply at 1.5V (SC1172) or an adjustable output
(SC1173).
The output of the linear regulator can provide up to 5A or
more with the appropriate external MOSFET.
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
II VRM8.1 require-
鈥?/div>
ments
1.5V or Adj. @ 1% for linear section
APPLICATIONS
鈥?/div>
Pentium
廬
ll or Deschutes microprocessor supplies
鈥?/div>
Flexible motherboards
鈥?/div>
1.3V to 3.5V microprocessor supplies
鈥?/div>
Programmable dual power supplies
ORDERING INFORMATION
Part Number
(1)
Package
Linear
Voltage
Temp.
Range (T
J
)
SC1172CSW
SC1173CSW
SO-24
SO-24
1.5V
Adj.
0擄 to 125擄C
0擄 to 125擄C
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
PIN CONFIGURATION
BLOCK DIAGRAM
VCC CS- CS+
EN
BSTH
1.25 REF
VCC
70mV
VID4
VID3
VID2
VID1
VID0
D/A &
SHUT-
DOWN
LOGIC
CURRENT LIMIT
LEVEL SHIFT
AND HIGH SIDE
MOSFET DRIVE
R
OSCILLATOR
S
Q
PGNDH
Top View
AGND
NC
NC
LDOS
VCC
OVP
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
GATE
LDOV
VID0
VID1
VID2
VID3
VID4
VOSENSE
EN
BSTH
BSTL
DL
VOSENSE
OPEN
COLLECTORS
PWRGOOD
VCC
DH
SHOOT-
THRU
CONTROL
ERROR
AMP
SYNCHRONOUS
MOSFET DRIVER
BSTL
DL
OVP
(24 Pin SOIC)
PGNDL
AGND
1.25V
REF
FET
CONTROLLER
LDOV
GATE
LDOS
Pentium is a registered trademark of Intel Corporation
1
漏 1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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