SC1151 查看數據表（PDF） - Semtech Corporation
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SC1151 Datasheet PDF : 7 Pages
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SC1151
Programmable DC/DC Controller
for Advanced Microprocessors
POWER MANAGEMENT
Description
Features
The SC1151 voltage mode controller contains most of
the circuitry necessary to implement a DC/DC converter
for powering advanced microprocessors such as
Klamath, both in single and multiple processor
configurations.
u 85% efficiency
u 5 bit DAC for output programmability
u On chip power good and OVP functions
u Designed for Intel Klamath VRM8.1 requirements
The SC1151 features an integrated 5 bit D/A converter,
pulse by pulse current limiting, integrated power good
signaling, logic compatible shutdown and on-board over
voltage protection (OVP).
The SC1151 operates at a fixed frequency of 200kHz,
providing an optimum compromise between size,
efficiency and cost in the intended application areas.
Applications
u Klamath microprocessor supplies
u Klamath VRM modules
u 1.8V to 3.5V microprocessor supplies
u Programmable power supplies
The integrated D/A converter provides programmability
of output voltage from 2.0V to 3.5V in 100mV
increments and 1.80V to 2.05V in 50mV increments with
no external components.
The SC1151 provides an OVP output which can be used
to trigger a crowbar circuit for true over voltage protec-
tion.
Typical Application Circuit
5V IN
+
C3
1000uF
R2
C1
+
+ 10k
0.1uF
C2
C4
1000uF
1000uF
12V IN
OVP
VID0
VID1
VID2
VID3
VID4
SHUTDOWN
PWRGD
Q1
IRL3302S
L1
4uH
R5
10
D1
PSR16C30CT
R1
5mOhm
C6
1000uF
C8
1000uF
C10
1000uF
+
+
+
VCCP
+
+
+
C5
1000uF
C7
1000uF
C9
1000uF
C12
0.1uF
U1
2 VCC
3 OVP
16 VID0
15 VID1
14 VID2
13 VID3
10 EN
1 GND
CS+ 6
CS- 5
VOSENSE 11
PWRGOOD 4
VID4 12
BST 9
DH 8
PGND 7
SC1151CS
R3 2.32k
C11
0.1uF
R4
1.00k
REF 16935F
C13
0.1uF
Revision 04/2001
1
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