SC192 Semtech Corporation, SC192 Datasheet

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SC192

Manufacturer Part Number
SC192
Description
Manufacturer
Semtech Corporation
Datasheet

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The SC192 is a synchronous step-down converter with
integrated power devices designed for battery operated
systems. The internal power switches reduce system
size and cost. In addition, an efficiency of 95% can be
achieved for significant line and load ranges. The SC192
is designed for single-cell Li-Ion battery applications, but
also performs well in fixed 3.3V or 5V input circuits.
The SC192 has a flexible clocking scheme. It can be
synchronized to an external oscillator, fixed to the inter-
nal oscillator, or allowed to modulate the frequency dur-
ing light loads (PSAVE) for maximum battery life, by the
method called pulse frequency modulation (PFM). Shut-
down places the switches in a high impedance state and
turns off all control circuitry to achieve a typical quies-
cent current of 0.1μA.
Line and load regulation is to +/-0.5% of the output volt-
age. The internal MOSFET switches provide >1A peak
current to provide a DC output of at least 700mA.
Grounding the ILIM pin reduces the current limit by half.
The SC192 can achieve 100% duty cycle for excellent
low dropout performance and comes in a tiny MLPD-10,
3 x 3 package having a maximum height of 1mm.
Revision 8, March 26, 2007
POWER MANAGEMENT
Description
Typical Application Circuit
Vin = 2.7V to 7V
C3
C1
2
1
8
6
3
ILIM
GND
EN
BP
VIN
SC192
SYNC/PWM
PGND
COMP
ADJ
LX
1
10
9
5
7
4
Features
Applications
2.7V to 7V Input Range
Output Adjustable from 0.75V to Vin
Fixed Frequency or PSAVE for Maximum
Efficiency Over Wide Load Current Range
700mA Guaranteed Output Current
No Schottky Diode Required
35μA Quiescent Current
100% Duty Cycle in Dropout
95% Efficiency
Fast Transient Response
Over Temperature Protection
Space-saving Micro Lead-Frame Package
Cell Phones
Cordless Phones
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
1 Li-Ion or 3 NiMH/NiCd Powered Devices
MLPD-10 3x3
R8
with Integrated Power Devices
Synchronous Buck Converter
L1
C4
C5
R1
R2
Vout = 0.75V to Vin
www.semtech.com
SC192
C6

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SC192 Summary of contents

Page 1

... The SC192 is designed for single-cell Li-Ion battery applications, but also performs well in fixed 3. input circuits. The SC192 has a flexible clocking scheme. It can be synchronized to an external oscillator, fixed to the inter- nal oscillator, or allowed to modulate the frequency dur- ing light loads (PSAVE) for maximum battery life, by the method called pulse frequency modulation (PFM) ...

Page 2

... www.semtech.com SC192 ° ° C ° ...

Page 3

... www.semtech.com SC192 μ μ μ A μ ...

Page 4

... www.semtech.com SC192 ...

Page 5

... POWER MANAGEMENT Block Diagram BP ILIM and slope SYNC/ generation ADJ EN © 2007 Semtech Corp. - Plimit amp + Control logic - PW M comp + - Error amp + 750mV SC192 VIN + Current amp - Nlimit comp - www.semtech.com ...

Page 6

... POWER MANAGEMENT Description Description The SC192 step-down, pulse-width-modulated (PWM), DC-DC converter has an adjustable output range from 0.75V to the input voltage. The device has an internal synchronous rectifier and does not require a schottky diode on the LX pin. At moderate to heavy loads, the converter operates in the PWM mode with a fixed frequency of 750kHz. At light ...

Page 7

... TP8 ILIM TP4 VIN PGND 10uH 3 8 GND COMP SY NC 47pF 5 6 ADJ ILIM SC192 R3 100k 7 SC192 TP7 100k SW1 DIP TP5 VOUT R1 442k TP6 309k 0.1uF 22uF SYNC R4 100k www.semtech.com 1. ...

Page 8

... POWER MANAGEMENT Evaluation Board Gerber Plots TOP COPPER TOP SILKSCREEN © 2007 Semtech Corp. BOTTOM COPPER BOTTOM SILKSCREEN 8 SC192 PRELIMINARY www.semtech.com ...

Page 9

... Applications Information Selecting Components When selecting components for the an SC192 application the main factors are typically performance, size and cost. For higher performance the designer will select higher values of input and output capacitors to reduce ripple current and voltage. However, for an application that can tolerate higher ripple, less expensive and smaller compo- nents can be utilized. The schematics below show two possibilities. The first shows the use of 10μ ...

Page 10

... PWM, Cout = 20uF, Lout = 10uH PWM, Cout = 10uF, Lout = 10uH 10 SC192 PRELIMINARY ...

Page 11

... The most conservative approach would be to select an inductor with a saturation current slightly above the maximum current capability of the SC192 which is 1.56A peak current for ILIM = Vin or 780mA for ILIM = GND. A more accurate design of the inductor would be to rate ...

Page 12

... Ouput Current (mA) Efficiency at Vin = 200 400 600 Load Current (mA) Efficiency at Vin = 3. 200 400 600 Load Current (mA) Line Regulation At Iout = 300mA 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 Input Voltage (Volts) www.semtech.com SC192 2.5V 600 1.8V ...

Page 13

... Vin = 2.7 V 750 Vin = 3.6V 745 Vin = 5.5V 740 735 730 725 720 715 710 80 100 120 140 2 Vin = 3.6V 85 125 SC192 SC192 Load Regulation Limits 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 Load Reg Max Load Reg Typ 0.1 Load Reg Min 0.0 0 0.2 0.4 0.6 0.8 Peak Inductor Current (Amps) Oscillator Frequency vs V Over Temperature IN 2 ...

Page 14

... Top Marking 192 yyww yy = two-digit year of manufacture ww = two-digit week of manufacture © 2007 Semtech Corp SEATING PLANE bxN bbb SC192 PRELIMINARY DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX - - A .031 .039 0.80 1. .000 .002 0.00 ...

Page 15

... Contact Information © 2007 Semtech Corp. DIMENSIONS DIM INCHES (.112 .075 H .055 .087 P .020 X .012 Y Y .037 Z .150 Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 Visit us at: www.semtech.com 15 SC192 MILLIMETERS (2.85) 1.90 1.40 2.20 0.50 0.30 0.95 3.80 www.semtech.com ...

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