PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
October 25, 1999
SC1164/5
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1164/5 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
廬
microprocessors such as Pentium II.
The SC1164/5 switching section features an integrated
5 bit D/A converter, pulse by pulse current limiting,
integrated power good signaling, and logic compatible
shutdown. The SC1164/5 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 SC1164/5 linear sections are low dropout regula-
tors. The SC1164 supplies 1.5V for GTL bus and 2.5V
for non-GTL I/O.
For the SC1165 both LDO鈥檚 are adjustable.
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 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 triple power supplies
ORDERING INFORMATION
Part Number
(1)
Package
Linear
Voltage
Temp.
Range (T
J
)
SC1164CSW
SC1165CSW
SO-24
SO-24
1.5V/2.5V 0擄 to 125擄C
Adj.
0擄 to 125擄C
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
PIN CONFIGURATION
BLOCK DIAGRAM
REF.
Top View
AGND
GATE1
LDOS1
LDOS2
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
GATE2
LDOV
VID0
VID1
VID2
VID3
VID4
VOSENSE
EN
BSTH
BSTL
DL
FET
CONTROLLER
2.5V/ADJ.
1.265V
REF.
FET
CONTROLLER
1.5V/ADJ.
(24 Pin SOIC)
LDOV
Pentium is a registered trademark of Intel Corporation
1
漏 1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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