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Semtech Corporation - Programmable Synchronous DC/DC Converter

Numéro de référence SC1173
Description Programmable Synchronous DC/DC Converter
Fabricant Semtech Corporation 
Logo Semtech Corporation 





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SC1173 fiche technique
POWER MANAGEMENT
Description
SC1172 & SC1173
Programmable Synchronous DC/DC
Converter with LDO Controller
Features
The SC1172/3 combines a synchronous voltage mode con-
troller with a low-dropout linear regulator providing most
of the circuitry necessary to implement two DC/DC con-
verters for powering advanced microprocessors such as
Pentium® II .
The SC1172/3 switching section features an integrated 5
bit D/A converter, pulse by pulse current limiting, inte-
grated power good signaling, and logic compatible shut-
down. The SC1172/3 switching section operates at a fixed
frequency of 200kHz, providing an optimum compromise
between size, efficiency and cost in the intended applica-
tion areas. The integrated D/A converter provides pro-
grammability 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 low dropout regulator.
The SC1172 supplies 1.5V for GTL bus , the SC1173 fea-
tures an adjustable LDO voltage.
u Synchronous design, enables no heatsink solution.
u 95% efficiency (switching section).
u 5 bit DAC for output programmability.
u On chip power good function.
u Designed for Intel Pentium® ll VRM8.1 requirements.
u 1.5V or Adjustable @ 1% for linear section.
Applications
u Pentium® ll microprocessor supplies
u Flexible motherboards
u 1.3V to 3.5V microprocessor supplies
u Programmable triple power supplies
Typical Application Circuit
12V
5V
+
1500uF
x2
PWRGOOD
VID0
VID1
VID2
VID3
VID4
EN
3.3V
10
0.1uF
U4
5 VCC
7 PWRGOOD
CS+ 9
CS- 8 0.1uF
22 VID0
VOSENSE 17
IRLR3103N
21 VID1
20 VID2
BSTH
DH
15
11
2R2
19 VID3
BSTL 14
IRLR3103N
18 VID4
16 EN
DL
PGNDH
13
10
2R2
1 AGND
PGNDL 12
23 LDOV
OVP 6
24 GATE
NC 2
4 LDOS
NC 3
SC1172/3CSW
0.1uF
+
4.7uF
1.9uH
OVP
1.00k
2.32k
5mOhm
VCC_CORE
+
1500uF
x4
0.1uF
330uF
+
IRLR024N
+
330uF
1.5V
Revision 1, January 2001
1
www.semtech.com

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