SC1154 데이터 시트보기 (PDF) - Semtech Corporation
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SC1154
Semtech Corporation
SC1154 Datasheet PDF : 20 Pages
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SC1154
Programmable Synchronous DC/DC
Hysteretic Controller for Advanced Processors
POWER MANAGEMENT
Description
.eatures
PRELIMINARY
The SC1154 is a synchronous-buck switch-mode
controller designed for use in single ended power supply
applications where efficiency is the primary concern. The
controller is a hysteretic type, with a user selectable
hysteresis. The SC1154 is ideal for implementing DC/
DC converters needed to power advanced
microprocessors such as Pentium® lI in both single and
multiple processor configurations. Inhibit, under-voltage
lockout and soft-start functions are included for
controlled power-up.
SC1154 features include an integrated 5 bit D/A
converter, temperature compensated voltage reference,
current limit comparator, over-current protection, and an
adaptive deadtime circuit to prevent shoot-through of
the power MOS.ET during switching transitions. Power
good signaling, logic compatible shutdown, and over-volt-
age protection are also provided. The integrated D/A
converter provides programmability of output voltage
from 1.3V to 3.5V with no external components.
K Programmable hysteresis
K 5 bit DAC programmable output (1.3V-3.5V)
K On-chip power good and OVP functions
K Designed to meet latest Intel specifications
K Up to 95% efficiency
K +1% tolerance over temperature
Applications
K Server Systems and Workstations
K Pentium® II Core Supplies
K Multiple Microprocessor Supplies
K Voltage Regulator Modules
The SC1154 high side driver can be configured as either
a ground-referenced or as a floating bootstrap driver.
The high and low side MOS.ET drivers have a peak cur-
rent rating of 2 amps.
Typical Application Circuit
+5V
R2
1k
R4
1k
R5
*
R6
20k
C2
0.001
R1
*
R9
U1
10k
SC1154CSW
R3
*
1 IOUT
PWRGD 28
2 DROOP
VID0 27
3 OCP
VID1 26
4 VHYST
VID2 25
5 VREFB
C1
0.1
6 VSENSE
VID3 24
VID25 23
7 AGND
INHIBIT 22
R10
1k
R11
1k
PWRGD
"POWER GOOD"
C6
0.1
INHIB
"INHIBIT"
C7
0.1
L1
0.5uH
+
Cin
H.
Cin
Bulk
Vin
C3
0.1
+5V
C4
0.01
8 SOFTST
9 N/C
10 LODRV
11 LOHIB
12 DRVGND
13 LOWDR
14 DRV
C5
IOUTLO 21
LOSENSE 20
C8
0.033
HISENSE 19
BOOTLO 18
HIGHDR 17
Q1
.DB6035AL
R12
1.0
BOOT
VIN12V
16
+12V
15
C9
1.0
Q2
.DB7030BL
R14
1.6
C10
L2
1.0uH
Cout
Bulk
Cout
H.
1
Revision 3, June 2001
R7
R8 *
10k
*) for the values see specific application circuit somewhere else in the datasheet
1
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