SC1109 Ver la hoja de datos (PDF) - Semtech Corporation
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SC1109 Datasheet PDF : 17 Pages
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PRELIMINARY - October 16, 2000
SYNCHRONOUS PWM CONTROLLER WITH
DUAL LOW DROPOUT REGULATOR
CONTROLLERS
SC1109
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Maximum
VCC to GND
STBY to GND
BST to GND
-0.3 to +7
-0.3 to +7
-0.3 to +15
PHASE to GND
-1 to +8
LDOSx
-0.3 to 5
Operating Temperature Range
Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 seconds
Thermal Impedance Junction to Ambient
TA
TJ
TSTG
TL
θJA
0 to +70
0 to +125
-65 to +150
300
130
Thermal Impedance Junction to Case
θJC
30
Note:
Exceeding the Absolute Maximum Ratings may cause irreversible damage to the device.
ELECTRICAL CHARACTERISTICS
Units
V
V
V
V
V
°C
°C
°C
°C
°C/W
°C/W
Unless specified: VOSENSE = VO; Vcc=4.75V to 5.25V; STBY=4.75V to 5.25V; BST = 11.4V to 12.6V; TA = 0 to 70°C
PARAMETER
SYM CONDITIONS
MIN TYP
Supply (VCC)
Supply Voltage
Supply Quiescent current
Supply Operating current
Switching Section
Output Voltage(1)
Load Regulation(1)
Line Regulation(1)
Oscillator Frequency
Oscillator Max Duty Cycle
VCC
ICCQ
VCC = 5V, SS/EN = 0V
ICC
VCC = 5V, SS/EN > 1V
VTT
LOADREG
LINEREG
fOSC
D
IO = 2A
IO = 0A to 6A
Vin=4.75V to 5.25V
4.4
5
6
8
1.188
175
90
1.200
1
±0.15
200
95
Current Limit trip (Vin-VPHASE)
Gain (AOL)(3)
Under Voltage Lock Out
VtripIlimit
GAINVTT
VOSENSE to VO
180 200
35
Threashold
VCCHIGH
4.2
Hysteresis
VCCHYST
200
Power Good
Power Good Threshold Voltage
Soft Start / Enable
SS/EN Source current(2)
SS/EN Sink current(2)
Shutdown Voltage
PGth
IsourceSS/EN VSS/EN = 0V to 3.5V
IsinkSS/EN VSS/EN = 0V to 3.5V
VSS/EN
88
10
2
600
MAX
5.25
12
20
1.212
225
220
112
UNITS
V
mA
mA
V
%
%
kHz
%
mV
dB
V
mV
%
µA
µA
mV
© 2000 SEMTECH CORP.
2
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
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