SYNCHRONOUS DC/DC CONTROLLER FOR
DISTRIBUTED POWER SUPPLY APPLICATIONS
September 5, 2000
SC1102
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1102 is a low-cost, full featured, synchronous
voltage-mode controller 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
SC1102 is ideal for implementing DC/DC converters
needed to power advanced microprocessors in low
cost systems, or in distributed power applications
where efficiency is important. Internal level-shift, high-
side drive circuitry, and preset shoot-thru control, al-
lows the use of inexpensive N-channel power switches.
SC1102 features include temperature compensated
voltage reference, triangle wave oscillator and current
sense comparator circuitry. Power good signaling,
shutdown, and over voltage protection are also pro-
vided.
The SC1102 operates at a fixed 200kHz, providing an
optimum compromise between efficiency, external
component size, and cost.
FEATURES
鈥?/div>
1.265V Reference available
鈥?/div>
Synchronous operation
鈥?/div>
Over current fault monitor
鈥?/div>
On-chip power good and OVP functions
鈥?/div>
Small size with minimum external components
鈥?/div>
Soft Start
鈥?/div>
R
DS(ON)
Current sensing
APPLICATIONS
鈥?/div>
Microprocessor core supply
鈥?/div>
Low cost synchronous applications
鈥?/div>
Voltage Regulator Modules (VRM)
ORDERING INFORMATION
DEVICE
(1)
PACKAGE
SO-14
TEMP. RANGE (T
J
)
0 - 125擄C
SC1102CSTR
SC1102EVB
Evaluation Board
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
APPLICATION CIRCUIT
Typical Distributed Power Supply
+5V
+
R1
1k
R2
C1
0.1
R4
10
C2
0.1
1
PWRGD
2
R3
1k
OVP
PWRGD
SS/SHDN
13
VCC
U1
SC1102
GND
14
C3
0.1
SHDN
C5
10.0
C6
680/6.3V
C7
680/6.3V
C8
680/6.3V
Vin 5V
_
3
OVP
VREF
12
VREF
R8
124*
4
OCSET
SENSE
11
R7
127
5
D1
MBR0520
PHASE
BSTH
10
C4
1.0
+12V
Q1
STP40NE
R5
3.9
R6
2.2
Q2
STP40NE
C9
180/4V
C10
180/4V
C11
180/4V
C12
180/4V
C13
180/4V
L1
2uH
6
DRVH
BSTL
9
+
7
PGND
DRVL
8
Vout=2.5V*
_
NOTE:
*) Vout = 1.265 x (1+R8/R7)
Figure 1.
1
漏 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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