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Buck Converter. SC194A Datasheet

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Buck Converter. SC194A Datasheet






SC194A Converter. Datasheet pdf. Equivalent




SC194A Converter. Datasheet pdf. Equivalent





Part

SC194A

Description

1A Synchronous Buck Converter

Manufacture

Semtech

Datasheet
Download SC194A Datasheet


Semtech SC194A

SC194A; SC194A 1A Synchronous Buck Converter wit h Integrated www.DataSheet4U.com Power Devices POWER MANAGEMENT Description Th e SC194A is a synchronous step-down con verter with integrated power devices. T he SC194A is designed for single-cell L i-Ion battery applications, but can als o be used in fixed 3.3V or 5V applicat ions. The switching frequency is nomina lly set to 1MHz, all.


Semtech SC194A

owing the use of small inductors and cap acitors. The 1.3A maximum current ratin g of the internal MOSFET switches allow s a DC output current of 1A. The SC194A has a flexible clocking methodology t hat allows it to be synchronized to an external oscillator or controlled by th e internal oscillator. The device can o perate in either forced PWM mode or in PSAVE mode. If PSAVE.


Semtech SC194A

mode is enabled the part will automatic ally enter PFM at light loads to mainta in maximum efficiency across the full load range. For noise sensitive applica tions, PSAVE mode can be disabled by sy nchronizing to an external oscillator, or pulling the SYNC/PWM pin high. Shutd own turns off all the control circuitry to achieve a typical shutdown current of 0.1μA. Features .



Part

SC194A

Description

1A Synchronous Buck Converter

Manufacture

Semtech

Datasheet
Download SC194A Datasheet




 SC194A
POWER MANAGEMENT
Description
The SC194A is a synchronous step-down converter with
integrated power devices. The SC194A is designed for
single-cell Li-Ion battery applications, but can also be used
in xed 3.3V or 5V applications. The switching frequency is
nominally set to 1MHz, allowing the use of small inductors
and capacitors. The 1.3A maximum current rating of the
internal MOSFET switches allows a DC output current of
1A.
The SC194A has a exible clocking methodology that
allows it to be synchronized to an external oscillator or
controlled by the internal oscillator. The device can
operate in either forced PWM mode or in PSAVE mode. If
PSAVE mode is enabled the part will automatically enter
PFM at light loads to maintain maximum efciency across
the full load range.
For noise sensitive applications, PSAVE mode can be
disabled by synchronizing to an external oscillator, or
pulling the SYNC/PWM pin high. Shutdown turns off all
the control circuitry to achieve a typical shutdown current
of 0.1μA.
SC194A
1A Synchronous Buck Converter
with Integrated Power Deviceswww.DataSheet4U.com
Features
‹ Up to 93% efciency
‹ Output current - 1A
‹ Input range - 2.7V to 5.5V
‹ Quiescent current - 17μA
‹ Four selectable output voltages
‹ Dynamic voltage positioning capability
‹ Fixed 1MHz frequency or 750kHz to 1.25MHz
synchronized operation
‹ PSAVE operation to maximize efciency at light loads
‹ Minimal external components
‹ Fast transient response
‹ 100% duty cycle in dropout
‹ Soft-start
‹ Over-temperature and short-circuit protection
‹ Space-saving lead-free package - MLP-10, 3 x 3mm
Applications
‹ Cell phones
‹ Wireless communication chipset power
‹ Personal media player
‹ Notebook and sub-notebook computers
‹ PDAs and mobile communicators
‹ WLAN peripherals
Typical Application Circuit
VIN
2.7V to 5.5V
CIN
10μF
SC194A
VIN LX
EN
SYNC/PWM
VOUT
VID0
VID1
PGND
MODE
GND
L1
4.7μH
COUT
VOUT
1.8V
1A
10μF
July 05, 2006
1 www.semtech.com





 SC194A
SC194A
POWER MANAGEMENT
www.DPatRaSEheLeItM4U.IcNomARY
Absolute Maximum Ratings
Exceeding the specications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specied in the
Electrical Characteristics section is not recommended.
Parameter
Symbol
Maximum
Units
Input Supply Voltage
Logic Inputs
(SYNC/PWM, EN, MODE, VID0, VID1)
VIN -0.3 to 7
VN -0.3 to VIN+0.3, 7V Max
Output Voltage
VOUT
-0.3 to VIN+0.3, 7V Max
LX Voltage
VLX -1 to VIN +1, 7V Max
Thermal Impedance Junction to Ambient(1)
θJA
40
VOUT Short-Circuit to GND
tSC Continuous
Operating Ambient Temperature Range
TA
-40 to +85
Storage Temperature
TS -60 to +160
Junction Temperature
TJC -40 to +150
Peak IR Reow Temperature
TLEAD
260
ESD Protection Level (2)
VESD
2
Note:
1) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
2) Tested according to JEDEC standard JESD22-A114-B.
V
V
V
V
°C/W
s
°C
°C
°C
°C
kV
Electrical Characteristics
Unless otherwise noted: VIN = 3.6V, EN = VIN, SYNC/PWM = VIN, MODE = VIN , TA = -40 to 85°C. Typical values are at TA = 25°C.
Parameter
Symbol
Conditions
Min Typ
Input Voltage Range
VOUT Accuracy
VOUT Temperature Accuracy
Line Regulation
Load Regulation (PWM)
PSAVE Regulation
P-Channel On Resistance
N-Channel On Resistance
Start-Up Time
P-Channel Current Limit
VIN
VOUT
VOUT(T)
VOUT LINE
VOUT LOAD
VOUT PSAVE
RDSP
RDSN
TSTART
ILIM(P)
IOUT = 0.5A, TA = 25°C
IOUT = 0.5A, TA = -40 to 85°C
VIN = 2.7V to 5.5V, VOUT = 1.8V,
IOUT = 0.5A, TA = -40 to 85°C
IOUT = 0A to 1A, TA = -40 to 85°C
SYNC/PWM =GND, COUT=22 μF
ILX = 100mA
ILX = 100mA
2.7
±0.3
±0.4
±0.3
+1.3
-0.3
0.275
0.165
1.33 1.9
© 2006 Semtech Corp.
2
Max Units
5.5 V
±1 %
±0.7 %
±0.65
%
±0.65
+1.6
-0.6
5
2.47
%
%
Ω
Ω
ms
A
www.semtech.com





 SC194A
SC194A
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Parameter
Quiescent Current
Shutdown Current
LX Leakage Current PMOS
LX Leakage Current NMOS
Oscillator Frequency
SYNC Frequency (upper)
SYNC Frequency (lower)
UVLO Threshold (upper)
UVLO Hysteresis
Thermal Shutdown
Thermal Shutdown Hysteresis
Logic Input High
Logic Input Low
Logic Input Current High
Logic Input Current Low
Symbol
IQ
ISD
ILXP
ILXN
fOSC
fSYNCU
fSYNCL
VUVL
VUVLHYS
TSD
TSD-HYS
VIH
VIL
IIH
IIL
Conditions
SYNC/PWM = GND, IOUT = 0A,
VOUT = 1.04 x VOUT(Programmed)
EN = GND, LX = OPEN
LX = GND, EN = GND
LX = 3.6V, EN = GND
EN, SYNC/PWM, VID0, VID1, MODE
EN, SYNC/PWM, VID0, VID1, MODE
EN, SYNC/PWM, VID0, VID1, MODE
EN, SYNC/PWM, VID0, VID1, MODE
Min
-2
0.85
1.25
2.38
1.6
-2
-2
www.DPatRaSEheLeItM4U.IcNomARY
Typ Max Units
17 28 μA
0.1 1
μA
0.1 2
μA
0.1 μA
1.0 1.15 MHz
MHz
750 kHz
2.52 2.65
V
50 mV
145 °C
10 °C
V
0.6 V
0.1 2
μA
0.1 2
μA
© 2006 Semtech Corp.
3
www.semtech.com



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