SC1101 Semtech Corporation, SC1101 Datasheet

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SC1101

Manufacturer Part Number
SC1101
Description
Manufacturer
Semtech Corporation
Datasheet

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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.
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.
POWER MANAGEMENT
Revision: May 25, 2005
Description
Typical Application Circuit
+12V
+5V
GND
C4
0.1
* NOTE:
R1
10
R6 = R7 x (Vout/1.25 - 1) rounded to nearest 1%value
R2
1k
C1
1.0
C5
0.001
R3
1k
150/6.3V
C2
1
2
3
4
VCC
CS(-)
CS(+)
PGND
150/6.3V
C3
SC1101
U1
IRLR3103
Q1
GND
BST
DH
FB
8
7
6
5
C6
0.01
C7
0.1
MBRD1035L
D2
L1
4uH
1
Features
R4
2.2
Applications
Low cost / small size
Switch mode efficiency up to 95%
1% reference voltage accuracy
Over current protection
500mA output drive
SO-8 package
Pentium® P55 Core Supply
Low Cost Microprocessor Supplies
Peripheral Card Supplies
Industrial Power Supplies
High Density DC/DC Conversion
R5
0.05
C8
330/2.5V
Asynchronous Voltage
Mode PWM Controller
C9
330/2.5V
C10
330/2.5V
C11
1.0
Vout = 2V @ 10A
www.semtech.com
R6
76.8 *see note
R7
127
+
GND

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SC1101 Summary of contents

Page 1

... Pulse by pulse current limiting is implemented by sensing the differential voltage across an external resistor 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. Typical Application Circuit ...

Page 2

... < SC1101 ± ° ° ° ° ...

Page 3

... SC1101 ( ) ° ...

Page 4

... Capacitor(s) and the Cin, Q1, D1 loop. Under no circum- stances should GND be returned to a ground inside the Cin, Q1, D1 loop. 6) Vcc for the SC1101 should be supplied from the 5V supply through a 10 resistor, the Vcc pin should be decoupled directly to GND by a 0.1µF ceramic capacitor, trace lengths should be as short as possible ...

Page 5

... POWER MANAGEMENT Applications Information (Cont.) Layout diagram for the SC1101 Ra/Rb) O REF 10 SC1101CS 0.001uF Heavy lines indicate high current paths. Application Circuit 5V to 2.0V @ 10A (Bootstrapped) + 1.0 150/6.3V 150/6.3V GND VCC 2 CS(-) C4 C5 0.001 0.1 3 CS(+) ...

Page 6

... Input Voltage, (V) Output Ripple Voltage 3.3V 10A 2005 Semtech Corp. Load Regulation 180 1.0% 0.8% 0.6% 135 0.4% 0.2% 90 0.0% -0.2% 45 -0.4% -0.6% 0 -0.8% -1.0% -45 0 1.0E+6 10.0E+6 Efficiency 100% 95% 90% 85% 80% 75% 70% 65% 60% 5.250 5.500 0 6 SC1101 Output Current, ( Output Current, (A) www.semtech.com 3.3V 2.5V 1.8V 3.3V 2.5V 1.8V ...

Page 7

... TO BE DETERMINED AT DATUM PLANE -A- -B- DIMENSIONS DIM INCHES (.205 .118 .050 X .024 Y .087 Y Z .291 Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 7 SC1101 DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX - - .053 .069 1.35 1. .004 .010 0.10 0. .049 ...

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