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Buck Converter. SC192 Datasheet

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Buck Converter. SC192 Datasheet






SC192 Converter. Datasheet pdf. Equivalent




SC192 Converter. Datasheet pdf. Equivalent





Part

SC192

Description

Synchronous Buck Converter

Manufacture

Semtech

Datasheet
Download SC192 Datasheet


Semtech SC192

SC192; Synchronous Buck Converter with Integrat ed www.DataSheet4U.com Power Devices PO WER MANAGEMENT Description 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 c ost. In addition, an efficiency of 95% can be achieved for significant line an d load ranges. The.


Semtech SC192

SC192 is designed for single-cell Li-Io n battery applications, but also perfor ms well in fixed 3.3V or 5V input circu its. SC192 Features ‹ 2.7V to 7V Inp ut Range ‹ Output Adjustable from 0.75 V to Vin ‹ Fixed Frequency or PSAVE fo r Maximum Efficiency Over Wide Load Cur rent Range 700mA Guaranteed Output Curr ent No Schottky Diode Required 35μA Qu iescent Current 100% D.


Semtech SC192

uty Cycle in Dropout 95% Efficiency Fast Transient Response Over Temperature Pr otection Space-saving Micro Lead-Frame Package MLPD-10 3x3 ‹ ‹ ‹ ‹ The SC 192 has a flexible clocking scheme. It can be ‹ synchronized to an external o scillator, fixed to the inter- ‹ nal o scillator, or allowed to modulate the f requency dur- ‹ ing light loads (PSAVE ) for maximum battery lif.



Part

SC192

Description

Synchronous Buck Converter

Manufacture

Semtech

Datasheet
Download SC192 Datasheet




 SC192
POWER MANAGEMENT
Description
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.
SC192
Synchronous Buck Converter
with Integrated Power Deviceswww.DataSheet4U.com
Features
‹ 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
MLPD-10 3x3
Applications
‹ Cell Phones
‹ Cordless Phones
‹ Notebook and Subnotebook Computers
‹ PDAs and Mobile Communicators
‹ 1 Li-Ion or 3 NiMH/NiCd Powered Devices
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.
Typical Application Circuit
Vin = 2.7V to 7V
C1
C3
1
VIN
8
EN
6
ILIM
SC192
9
LX
ADJ 5
L1
2
BP
3
GND
10
PGND
7
SYNC/PWM
4
COMP
R8
C4
Vout = 0.75V to Vin
C5 R1
C6
R2
Revision 8, March 26, 2007
1
www.semtech.com





 SC192
SC192
POWER MANAGEMENT
www.DPatRaSEheLeItM4U.IcNomARY
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.
Parameter
Symbol
Maximum
Units
VIN input
SYNC/PWM Input
EN Input
PGND to GND
LX Voltage
ILIM Voltage
ADJ Voltage
COMP Voltage
BP Voltage
Thermal Impedance Junction to Ambient
Output Short Circuit to GND
LX Current
Peak IR Reflow Temperature
SC192IMLTR (Soldering) 10s - 30s
SC192IMLTRT (Soldering) 20s - 40s
VIN
VSYNC
VEN
VPGDN
VLX
VILIM
VADJ
VCOMP
VBP
θJA
tSC
ILX
TLEAD
-0-0.3.3toto7.75
-0-0.3.3toto7.75
-0-0.3.3toto7.75
-0.3 to 0.3
-1 to VIN +1
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
VIN - 0.3 to VIN + 0.3
*57
Continuous
+1.6
240
260
V
V
V
V
V
V
V
V
V
°C/W
s
A
°C
Storage Temperature
TS
* Tied to PCB with 1 square inch, 2 ounce copper.
Note: This device is ESD sensitive. Use of ESD handling precautions is required.
-65 to +160
°C
Electrical Characteristics
Unless otherwise noted: VIN = 3.6V, SYNC/PWM = VIN, ILIM = VIN, EN = VIN, TA =-40 to 85°C. Typical values are at TA = +25°C.
Parameter
Symbol
Conditions
Min Typ
Input Voltage Range
ADJ Regulation Voltage
ADJ Input Current
Output Voltage Adjust Range
Line Regulation
Load Regulation(1)
VIN
VADJ
IADJ
VOUT
REG
LINE
REGLOAD
ADJ = 0.75V
Peak Inductor Current =
0 to 700mA
2.7
0.731
-50
VADJ
-0.5
0
0.75
0
P-Channel On Resistance
N-Channel On Resistance
RDSP
RDSN
ILX = 200mA
ILX = 200mA
0.3
0.4
Max Units
57.5 V
0.769 V
50 nA
VIN
+0.5
V
%
0.6 %
Ω
Ω
© 2007 Semtech Corp.
2
www.semtech.com





 SC192
SC192
POWER MANAGEMENT
www.DataSheet4U.com
Electrical Characteristics Cont.
Unless otherwise noted: VIN = 3.6V, SYNC/PWM = VIN, ILIM = VIN, EN = VIN, TA =-40 to 85°C. Typical values are at TA = +25°C.
Parameter
Symbol
Conditions
Min Typ
Max
Units
P-Channel Current Limit
N-Channel Current Limit
ILIM(P)
ILIM(N)
ILIM = GND
ILIM = VIN
SYNC/PWM = GND, PSAVE Mode
420
840
45
-320
600
1200
105
-420
780
1560
165
-520
mA
mA
mA
mA
Quiescent current
Shutdown Current
LX leakage Current PMOS
LX leakage Current NMOS
Oscillator Frequency
SYNC Frequency Range
Duty Cycle Range
IQ SYNC/PWM = GND, PSAVE Mode
35 50 μA
ISD EN = 0, LX = Open, TA = 25°C
1 μA
ILXP VIN = 5.5V, LX = 0V, EN = 0V
1 μA
ILXN
VIN = 5.5V, LX = 5.5V, EN = 0V
-20
μA
fOSC 650 750 830 kHz
fSYNC 500 1000 kHz
D
SYNC/PWM = GND, PSAVE Mode
20
100 %
UVLO Threshold
UVLO Hysteresis
Thermal Shutdown
VUVL
VUVLHYS
2.35
2.5 2.65
V
50 mV
160 °C
Logic Input High
VIH
EN, SYNC/PWM, ILIM
2
V
Logic Input Low
VIL EN, SYNC/PWM, ILIM
0.8 V
Logic Input Current High
IIH
EN, SYNC/PWM, ILIM
-2
2 μA
Logic Input Current Low
IIL
EN, SYNC/PWM, ILIM
-2
2 μA
Notes:
(1) Load regulation limits are specified from 0 to 700mA. This specification is calculated based on parameters measured individually and is not a
tested parameter. See the load regulation limit graph on page 13 for more detailed view of performance.
© 2007 Semtech Corp.
3
www.semtech.com



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