SC1101CS Semtech Corporation, SC1101CS Datasheet

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SC1101CS

Manufacturer Part Number
SC1101CS
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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SC1101CS Summary of contents

Page 1

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 ...

Page 2

POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied ...

Page 3

POWER MANAGEMENT Pin Configuration Top View VCC CS(-) 7 3 CS(+) 6 PGND Lead Plastic SOIC) Pin Descriptions ...

Page 4

POWER MANAGEMENT Applications Information Layout Guidelines Careful attention to layout requirements are necessary for successful implementation of the SC1101 PWM controller. High currents switching at 200kHz are present in the application and their effect on ground plane volt- age differentials ...

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

POWER MANAGEMENT Typical Characteristics Error Amplifier, Gain and Phase 40 PIN Descriptions Gain 10 Phase -10 100.0E+0 1.0E+3 10.0E+3 100.0E+3 Frequency (Hz) Line Regulation V = 2.5V 10A O O ...

Page 7

... AND 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. ...

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