DatasheetsPDF.com

Buck Converter. SC198 Datasheet

DatasheetsPDF.com

Buck Converter. SC198 Datasheet






SC198 Converter. Datasheet pdf. Equivalent




SC198 Converter. Datasheet pdf. Equivalent





Part

SC198

Description

Dual DC-DC Buck Converter



Feature


Dual DC-DC Buck Converter with High Curr ent Capability www.DataSheet4U.com POWE R MANAGEMENT Description The SC198 is a high-efficiency, dual synchronous buc k converter designed for use in low pow er applications. Each converter is capa ble of supplying up to 600mA of average current at one of eight programmable o utput voltages commonly used as micropr ocessor supply volta.
Manufacture

Semtech

Datasheet
Download SC198 Datasheet


Semtech SC198

SC198; ges. The SC198 uses a single control log ic block for the two converters, but th eir controls can be set independently. The SC198 employs a flexible clocking scheme that allows the user to use the fixed internal 1MHz oscillator or sync hronize the clock to an external source . The device also has an optional power -save mode that optimizes efficiency f or light loads. The SC19.


Semtech SC198

8 provides output voltage flexibility w hile conserving board space by using co ntrol pins to select the output voltage instead of external resistor voltage d ivider circuits. This eliminates at lea st four parts from the traditional dual buck converter bill of materials. SC1 98 Features Dual buck converters with independent control High efficiency - over 90% peak 8 progra.


Semtech SC198

mmable output voltages Input voltage ran ge between 2.7V to 5.5V Fixed-frequency operation - 1MHz Optional SYNC clock i nput Optional power-save under light-lo ad conditions Shutdown current <1μA So ft-start to limit in-rush current 4mm x 4mm MLPQ package Applications Mobile phones Cordless phones MP3 players Digi tal cameras PDAs Single li-ion cell or (3) NiMH/NiCd cell .

Part

SC198

Description

Dual DC-DC Buck Converter



Feature


Dual DC-DC Buck Converter with High Curr ent Capability www.DataSheet4U.com POWE R MANAGEMENT Description The SC198 is a high-efficiency, dual synchronous buc k converter designed for use in low pow er applications. Each converter is capa ble of supplying up to 600mA of average current at one of eight programmable o utput voltages commonly used as micropr ocessor supply volta.
Manufacture

Semtech

Datasheet
Download SC198 Datasheet




 SC198
POWER MANAGEMENT
Description
The SC198 is a high-efciency, dual synchronous buck
converter designed for use in low power applications. Each
converter is capable of supplying up to 600mA of average
current at one of eight programmable output voltages
commonly used as microprocessor supply voltages.
The SC198 uses a single control logic block for the two
converters, but their controls can be set independently.
The SC198 employs a exible clocking scheme that
allows the user to use the xed internal 1MHz oscillator or
synchronize the clock to an external source. The device
also has an optional power-save mode that optimizes
efciency for light loads.
SC198
Dual DC-DC Buck Converter
with High Curwrwewn.DtataCShaeept4aU.cboimlity
Features
Dual buck converters with independent control
High efciency - over 90% peak
8 programmable output voltages
Input voltage range between 2.7V to 5.5V
Fixed-frequency operation - 1MHz
Optional SYNC clock input
Optional power-save under light-load conditions
Shutdown current <1μA
Soft-start to limit in-rush current
4mm x 4mm MLPQ package
The SC198 provides output voltage exibility while
conserving board space by using control pins to select
the output voltage instead of external resistor voltage
divider circuits. This eliminates at least four parts from
the traditional dual buck converter bill of materials.
Applications
Mobile phones
Cordless phones
MP3 players
Digital cameras
PDAs
Single li-ion cell or (3) NiMH/NiCd cell devices
Digital multimedia broadcast (DMB) devices
Portable gaming systems
Typical Application Circuit
1 VINA SC198
2 4.7μH
18 VINR
15 VINB
10μF 20 ENA
LXA
VOUTA
GNDA
4
3
5 CTLA0
6 CTLA1
7 CTLA2
4.7μH
LXB 14
16 ENB
VOUTB 12
11 CTLB0
GNDB 13
10 CTLB1
9 CTLB2
GNDR 8
17 SYNC
VOUTA
10μF
VOUTB
10μF
March 28, 2007
www.semtech.com
1




 SC198
SC198
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
VIN
VIN
-0.3 to 7
V
EN, SYNC Input
VEN V, SYNC
-0.3 to VIN +0.3
V
LXA and LXB Voltages
VLXA, VLXB
-1 to VIN +1
V
VOUT
VOUT
-0.3 to VIN +0.3
V
CTLA0, CTLA1, CTLA2, CTLB0, CTLB1 & CTLB2 Voltages
-0.3 to VIN +0.3
V
Output Short Circuit to GND
tSC
Indenite
s
LXA and LXB Currents
ILXA and ILXB
1.2
A
Thermal Impedance (Junction to Ambient)(1)
θJA 40 ºC/W
Operating Ambient Temperature
TA
-40 to +85
ºC
Maximum Junction Temperature
Storage Temperature
Reow Solder Temperature
TJ
TS
TPKG
150
-65 to +150
260
ºC
ºC
°C
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 as per JESD51 standards.
(2) Tested according to JEDEC standard JESD22-A114-B.
kV
Electrical Characteristics
Unless otherwise noted: VIN = 3.6V, SYNC = VIN, L = 4.7μH, C = 10μF, TA = -40°C to +85°C. Typical values are at TA = 25°C.
Parameter
Symbol
Conditions
Min Typ Max
Units
Input Voltage Range
VOUT Accuracy(1)
Line Regulation
Load Regulation
Minimum Duty Cycle
LXA, LXB Current Limit
Quiescent Current
Shutdown Current
LXA and LXB
Leakage Current
VIN
VOUT
VLINEREG
VLOADREG
DCMIN
ILIM
IQ
ISD
ILXA, ILXB
IOUT = 10mA to 600mA
VIN = 2.7 to 5.5V, VOUT = 1.8V, IOUT = 300mA
IOUT = 10mA to 600mA
IOUT = 0mA, SYNC = 0, ENA, ENB = VIN
ENA, ENB = 0, LXA, LXB = Open
VIN = 5.5V, LX = 0V, PMOS
VIN = 5.5V, LX = VIN, NMOS
2.7 5.5 V
-3 3 %
0.2 %/V
0.0008 %/mA
18 %
0.9 A
50 μA
0.1 1
μA
0.1 1
μA
-2 0.1
μA
© 2007 Semtech Corp.
2
www.semtech.com




 SC198
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Parameter
Symbol
Conditions
P-Channel On Resistance
N-Channel On Resistance
Start-Up Time
Oscillator Frequency
SYNC Frequency (upper)
SYNC Frequency (lower)
Thermal Shutdown
Thermal Shutdown
Hysteresis
RDSP
RDSN
tSTART
fOSC
fSYNCU
fSYNCL
THI
THYSR
ILXA, ILXB = 100mA
ILXA, ILXB = 100mA
UVLO Threshold
VUVL
Decreasing VIN
UVLO Hysteresis
VUVLHYS
Logic Input High(2)
VIH
Logic Input Low(2)
VIL
Notes:
(1) See Output Voltage Options table in the Application Information section.
(2) For ENA, ENB, SYNC, CTLA0, CTLA1, CTLA2, CTLB0, CTLB1, CTLB2.
SC198
www.DataSheet4U.com
Min Typ
0.35
0.25
0.85 1.1
1.25
145
10
2.4 2.5
50
1.6
Max
5
1.25
0.75
Units
Ω
Ω
ms
MHz
MHz
MHz
°C
°C
2.6 V
mV
V
0.6 V
© 2007 Semtech Corp.
3
www.semtech.com






Recommended third-party SC198 Datasheet






@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)