SC1152 Datasheet, PDF (4/7 Pages) Semtech Corporation – PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS

April 28, 1998
APPLICATION CIRCUIT
PROGRAMMABLE SYNCHRONOUS DC/DC
SC1152
CONTROLLER FOR ADVANCED PROCESSORS
5V IN
+
R2
C3
10k
1000uF
C1
+
+
0.1uF
C2
C4
1000uF
1000uF
R5
10
Q1
Q2
L1
4 uH
D1
1N5817
R1
5mOhm
C6
C8
C10
1000uF 1000uF 1000uF
+
+
+
VCCP
+
+
+
C5
1000uF
C7
1000uF
C9
1000uF
C12
0.1uF
12V IN
OVP
VID0
VID1
VID2
VID3
VID4
C13
0.1uF
SHUTDOWN
PWRGOOD
U1
2 _VCC
CS(+) ⁶
3 _OVP
CS(-) ⁵
20 _VID0
VOSENSE ¹⁵
19 _VID1
PWRGOOD ⁴
18 _VID2
VID4 ¹⁶
17 _VID3
BSTH ¹³
14 _SHUTDOWN
DH ⁸
1 _GND
PGNDH ⁷
10 _PGNDL
DL ¹¹
9 _NC
BSTL ¹²
SC1152CS
R3 2.32k R4 1.00k
C11
0.1uF
Pentium^® ll Power Supply
Figure 1.
MATERIALS LIST
Quantity Reference Part/Description Vendor
Notes
4
C1,C11-C13 0.1µF Ceramic
Various
9
C2-C10
1000µF/6.3V
SANYO MV-GX or equiv. Low ESR
1
D1
1N5817
Various
1
L1
4µH
8 Turns 16AWG on MICROMETALS T50-52D core
2
Q1, Q2
See notes
See notes FET selection requires trade-off between efficiency
and cost. Absolute maximum R_DS(ON) = 22 mΩ
1
R1
5mΩ
IRC
OAR-1 Series
1
R2
10kΩ, 5%, 1/8W Various
1
R3
2.32kΩ, 1%, 1/8W Various
1
R4
1kΩ, 1%, 1/8W
Various
1
R5
10Ω, 5%, 1/8W Various
1
U1
SC1152CS
SEMTECH
© 1998 SEMTECH CORP.
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