SC1101 Ver la hoja de datos (PDF) - Semtech Corporation
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SC1101 Datasheet PDF : 7 Pages
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SC1101
Asynchronous Voltage
Mode PWM Controller
POWER MANAGEMENT
Description
The SC1101 is a versatile, low-cost, voltage-mode PWM
controller designed for low output voltage 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 expensive
p-channel, high-side switch. The small device footprint
allows for compact circuit design.
Features
Low cost / small size
Switch mode efficiency up to 95%
1% reference voltage accuracy
Over current protection
500mA output drive
SO-8 package
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.
Applications
Pentium® P55 Core Supply
Low Cost Microprocessor Supplies
Peripheral Card Supplies
Industrial Power Supplies
High Density DC/DC Conversion
The SC1101 operates at a fixed frequency of 200kHz,
providing an optimum compromise between efficiency,
external component size, and cost.
Typical Application Circuit
+5V
Q1
IRLR3103
L1
R5
4uH
0.05
GND
C1
1.0
C2
C3
150/6.3V 150/6.3V
D2
MBRD1035L
+12V
R1
10
C4
0.1
R2
R3
1k
1k
U1
SC1101
C6
R4
1 VCC
GND 8
0.01
2.2
C5
0.001
2 CS(-)
3 CS(+)
4 PGND
FB 7
BST 6
C7
DH 5
0.1
* NOTE:
R6 = R7 x (Vout/1.25 - 1) rounded to nearest 1%value
Vout = 2V @ 10A
+
C8
C9
C10
C11
330/2.5V 330/2.5V 330/2.5V 1.0
R6
76.8 *see note
R7
127
GND
Revision: May 25, 2005
1
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