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SC1102 Datasheet(PDF) 1 Page - Semtech Corporation

Part No. SC1102
Description  Synchronous Voltage Mode Controller for Distributed Power Supply Applications
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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SC1102 Datasheet(HTML) 1 Page - Semtech Corporation

 
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POWER MANAGEMENT
1
www.semtech.com
SC1102/SC1102A
Synchronous Voltage Mode Controller
for Distributed Power Supply Applications
Features
Applications
Revision: January 5, 2006
Typical Application Circuit
Description
1.265V reference available
Synchronous operation for high efficiency (95%)
R
DS(ON) current sensing
On-chip power good and OVP functions
Small size with minimum external components
Soft Start
Enable function
14 Pin SOIC lead free package available. Fully
WEEE and RoHS compliant
Microprocessor core supply
Low cost synchronous applications
Voltage Regulator Modules (VRM)
DDR termination supplies
Networking power supplies
Sequenced power supplies
The SC1102 and SC1102A are low-cost, full featured,
synchronous voltage-mode controllers designed for use
in single ended power supply applications where efficiency
is of primary concern. Synchronous operation allows for
the elimination of heat sinks in many applications. The
SC1102s are ideal for implementing DC/DC converters
needed to power advanced microprocessors in low cost
systems, or in distributed power applications where effi-
ciency is important. Internal level-shift, high-side drive
circuitry, and preset shoot-thru control, allows the use of
inexpensive N-channel power switches.
SC1102s features include temperature compensated
voltage reference, triangle wave oscillator and current
sense comparator circuitry. Power good signaling, shut-
down, and over voltage protection are also provided.
The SC1102 operates at a fixed frequency of 200kHz
and the SC1102A at 500kHz, providing a choice for op-
timum compromise between efficiency, external compo-
nent size, and cost.
Two SC1102s can be used together to sequence power
up of telecom systems. The power good of the first
SC1102 connected to the enable of the second SC1102
makes this possible.
TTTTTypical Distribut
ypical Distribut
ypical Distribut
ypical Distribut
ypical Distributed P
ed P
ed P
ed P
ed Pooooow
w
w
w
wer Supply
er Supply
er Supply
er Supply
er Supply
Figure 1.
VCC
1
PWRGD
2
OVP
3
OCSET
4
PHASE
5
DRVH
6
PGND
7
DRVL
8
BSTL
9
BSTH
10
SENSE
11
VREF
12
SS/SHDN
13
GND
14
U1
SC1102
Q1
STP40NE
Q2
STP40NE
R5
3.9
L1
2uH
C9
180/4V
C10
180/4V
C11
180/4V
C12
180/4V
C7
680/6.3V
C6
680/6.3V
R1
1k
R3
1k
C2
0.1
C3
0.1
C1
opt.
R2
PWRGD
OVP
SHDN
VREF
+
_
+
_
Vin 5V
Vout=2.5V*
R7
127
R8
124*
NOTE:
*) Vout = 1.265 x (1+R8/R7)
+5V
D1
MBR0520
R6
2.2
C4
1.0
C5
10.0
C8
680/6.3V
R4
10
+12V
C13
180/4V
0.1


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