VOLTAGE MODE PWM CONTROLLER
SC1101
February 29, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1101 is a versatile, low-cost, voltage-mode
PWM controller designed for use in single ended DC/
DC power supply applications. A simple, fixed-voltage
buck regulator can be implemented using the SC1101
with a minimum of external components. Internal level
shift and drive circuitry eliminates the need for an ex-
pensive p-channel, high-side switch. The small device
footprint allows for compact circuit design.
SC1101 features include a temperature compensated
voltage reference, triangle wave oscillator, current limit
comparator, frequency shift over-current protection,
and an internally compensated error amplifier. Pulse by
pulse current limiting is implemented by sensing the
differential voltage across an external resistor, or an
appropriately sized PC board trace.
The SC1101 operates at a fixed frequency of 200kHz,
providing an optimum compromise between efficiency,
external component size, and cost.
FEATURES
鈥?/div>
Low cost / small size
鈥?/div>
Switch mode efficiency (90%)
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1% reference voltage accuracy
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Over current protection
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500mA output drive
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SO-8 package
APPLICATIONS
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Pentium廬 P55 Core Supply
鈥?/div>
Low Cost Microprocessor Supplies
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Peripheral Card Supplies
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Industrial Power Supplies
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High Density DC/DC Conversion
ORDERING INFORMATION
DEVICE
(1)
PACKAGE
SO-8
TEMP RANGE (T
J
)
0擄 to 125擄C
SC1101CS
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
PIN CONFIGURATION
BLOCK DIAGRAM
Top View
Vcc
Cs(-)
Cs(+)
GND
1
2
3
4
8
7
6
5
GND
FB
BST
DH
(8 LEAD PLASTIC SOIC)
Pentium is a registered trademark of Intel Corporation
1
漏 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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