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Buck Converter. SC194B Datasheet

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Buck Converter. SC194B Datasheet






SC194B Converter. Datasheet pdf. Equivalent




SC194B Converter. Datasheet pdf. Equivalent





Part

SC194B

Description

Selectable 3.6V/3.3V/3.0V/2.5V 1A Synchronous Buck Converter



Feature


Selectable 3.6V/3.3V/3.0V/2.5V www.DataS heet4U.com 1A Synchronous Buck Converte r POWER MANAGEMENT Description The SC19 4B is a synchronous step-down converter with integrated power devices. Four se lectable output voltages suitable for p ortable device interface, memory functi on blocks, and 5V to 3.3V voltage conve rsion are available. Automatic selectio n of Power Save Mo.
Manufacture

Semtech

Datasheet
Download SC194B Datasheet


Semtech SC194B

SC194B; de (PSAVE) is supported which enhances e fficiency. A 100% duty cycle mode allo ws operation for input voltages close t o the required output voltage. The need for external components is minimized b y providing internal feedback compensat ion, and allowing selection of the requ ired output voltage by hard wiring VID code inputs. The maximum current rating of the internal MOS.


Semtech SC194B

FET switches allows a DC output current of 1A. The switching frequency is nomin ally set to 1MHz, allowing the use of s mall inductors and capacitors. A flexi ble clocking scheme is used that allows synchronization to an external oscilla tor or control by the internal oscillat or. The device can operate in either fo rced PWM mode or in PSAVE mode. If PSAV E mode is enabled th.


Semtech SC194B

e part will automatically enter PSAVE at light loads to maintain maximum effic iency across the full load range. For n oise sensitive applications, PSAVE mode can be disabled by synchronizing to an external oscillator, or pulling the SY NC/ PWM pin high. Shutdown turns off al l the control circuitry to achieve a ty pical shutdown current of 0.1μA. SC19 4B Features ‹ ‹ ‹ ‹ .

Part

SC194B

Description

Selectable 3.6V/3.3V/3.0V/2.5V 1A Synchronous Buck Converter



Feature


Selectable 3.6V/3.3V/3.0V/2.5V www.DataS heet4U.com 1A Synchronous Buck Converte r POWER MANAGEMENT Description The SC19 4B is a synchronous step-down converter with integrated power devices. Four se lectable output voltages suitable for p ortable device interface, memory functi on blocks, and 5V to 3.3V voltage conve rsion are available. Automatic selectio n of Power Save Mo.
Manufacture

Semtech

Datasheet
Download SC194B Datasheet




 SC194B
POWER MANAGEMENT
Description
The SC194B is a synchronous step-down converter with
integrated power devices. Four selectable output voltages
suitable for portable device interface, memory function
blocks, and 5V to 3.3V voltage conversion are available.
Automatic selection of Power Save Mode (PSAVE) is
supported which enhances efciency. A 100% duty cycle
mode allows operation for input voltages close to the
required output voltage.
The need for external components is minimized by
providing internal feedback compensation, and allowing
selection of the required output voltage by hard wiring VID
code inputs. The maximum current rating of the internal
MOSFET switches allows a DC output current of 1A.
SC194B
Selectable 3.6V/3.3V/3.0V/2.5V
1A Synchronous Bwuwwc.DkataCShoeent4vU.ceormter
Features
‹ Up to 95% efciency
‹ PSAVE operation to maximize efciency
‹ Output current — 1A
‹ Input range — 2.7V to 5.5V
‹ Four selectable output voltages
‹ Quiescent current — 17μA in PSAVE
‹ Dynamic voltage positioning capability
‹ Fixed 1MHz frequency or 750kHz to 1.25MHz syn-
chronized operation
‹ Current mode operation for excellent line and load
transient response
‹ 100% duty cycle in dropout
‹ Soft-start
‹ Over-temperature and short-circuit protection
‹ Lead-free package — 3mm x 3mm MLPD
The switching frequency is nominally set to 1MHz, allowing
the use of small inductors and capacitors. A exible
clocking scheme is used that allows synchronization to an
external oscillator or control 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 PSAVE 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.
Applications
‹ PDA
‹ Pocket PC and Smart Phones
‹ USB Powered Modems
‹ CPUs and DSPs
‹ PC Cards and Notebooks
‹ xDSL Applications
‹ Standard 5-V to 3.3-V Conversion
Typical Application Circuit
VIN
3.6V to 5.5V
CIN
10μF
SC194B
VIN LX
EN
SYNC/PWM
VOUT
VID0
VID1
PGND
MODE
GND
L1
4.7μH
VOUT
3.3V
1A
COUT
22μF
August 24, 2006
1 www.semtech.com




 SC194B
SC194B
POWER MANAGEMENT
www.DataSheet4U.com
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
VN
-0.3 to 7
-0.3 to VIN +0.3, 7V Max
V
V
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
TP
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.
Electrical Characteristics
V
V
°C/W
s
°C
°C
°C
°C
kV
Unless otherwise noted: VIN = 5V ,VOUT = 3.3V, EN = VIN, SYNC/PWM = VIN, MODE = VIN , TA = -40 to 85°C. Typical values are at TA =25°C.
Parameter
Symbol
Conditions
Min Typ Max Units
Input Voltage Range
VOUT Accuracy
VOUT Temperature Accuracy
Line Regulation
Load Regulation (PWM)
PSAVE Regulation
VIN
VOUT
VOUT(T)
VOUT LINE
VOUT LOAD
VOUT PSAVE
VIN > VOUT + dropout
IOUT = 0.5A, TA = 25°C
VOUT = 2.5/3.0/3.3/3.6V
IOUT = 0.5A, TA=-40°C to 85°C
VIN = 2.7V to 5.5V, VOUT = 2.5V,
IOUT = 0.5A, TA=-40°C to 85°C
IOUT = 0A to 1A
SYNC/PWM = GND, COUT=22μF
2.7 5.5 V
±1 %
±0.3 ±0.7
%
±0.4 ±0.65 %
±0.3 ±0.65
+1.3 +1.6
-0.3 -0.6
%
%
P-Channel On Resistance
N-Channel On Resistance
Start-Up Time
P-Channel Current Limit
RDSP
RDSN
TSTART
ILIM(P)
ILX = 100mA, VIN=3.6V
ILX = 100mA, VIN=3.6V
VIN = 2.7V to 5.5V
0.275
0.165
5
1.33 1.9 2.47
Ω
Ω
ms
A
© 2006 Semtech Corp.
2
www.semtech.com




 SC194B
SC194B
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 V ,OUT(Programmed) VIN= 3.6V
EN = GND, LX = OPEN, VIN= 3.6V
VIN = 3.6V, LX = GND, EN = GND
VIN = 3.6V, LX = 3.6V, EN = GND
VIN= 3.6V
VIN= 3.6V
VIN= 3.6V
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.DataSheet4U.com
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
100 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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