LT1109 Ver la hoja de datos (PDF) - Linear Technology
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LT1109 Datasheet PDF : 8 Pages
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LT110 9
ABSOLUTE AXI U RATI GS
(Voltages Referred to GND Pin)
Supply Voltage (VOUT) .............................. – 0.4V to 20V
SW Pin Voltage .......................................... – 0.4V to 50V
SHUTDOWN Pin Voltage......................................... 6.0V
Maximum Power Dissipation ............................. 300mW
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
Switch Current ........................................................ 1.2A
PACKAGE/ORDER I FOR ATIO
VIN 1
NC 2
SW 3
GND 4
TOP VIEW
8 SENSE
7 SHUTDOWN
6 NC
5 NC
N8 PACKAGE
8-LEAD PLASTIC DIP
LT1109 • PO102
TJMAX = 100°C, θJA = 130°C/W
ORDER PART
NUMBER
LT1109CN8
LT1109CN8-5
LT1109CN8-12
VIN 1
NC 2
SW 3
GND 4
TOP VIEW
8 SENSE
7 SHUTDOWN
6 NC
5 NC
S8 PACKAGE
8-LEAD PLASTIC SOIC
LT1109 • PO103
TJMAX = 100°C, θJA = 150°C/W
ORDER PART
NUMBER
S8 PART
MARKING
LT1109CS8
LT1109CS8-5
LT1109CS8-12
1109
10905
10912
BOTTOM VIEW
321
VOUT SW GND
Z PACKAGE
3-LEAD TO-92 PLASTIC LT1109 • POI01
TJMAX = 100°C, θJA = 160°C/W
ORDER PART
NUMBER
LT1109CZ-5
LT1109CZ-12
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 3V (LT1109CN8, LT1109CS8), unless otherwise specified.
SYMBOL
IQ
VIN
VOUT
fOSC
tON
DC
VCESAT
PARAMETER
Quiescent Current
Minimum Start-Up Voltage
at VOUT Pin (Z Package)
Input Voltage (N8, S8 Package)
Comparative Trip Point Voltage
Output Voltage
Comparator Hysteresis
Output Voltage Ripple
Oscillator Frequency
Switch ON Time
Duty Cycle
Switch Saturation Voltage
CONDITIONS
Switch Off
q
q
LT1109
q
LT1109-5; 3V ≤ VIN ≤ 5V
q
LT1109-12; 3V ≤ VIN ≤ 12V
q
LT1109
q
LT1109-5
q
LT1109-12
q
q
q
Full Load
q
ISW = 500mA
LT1109-5: VIN = 3V; LT1109-12: VIN = 5V q
MIN
1.6
3
1.20
4.75
11.52
100
90
3.3
3.0
45
TYP
320
1.25
5.00
12.00
8
25
60
120
4.2
50
0.4
0.5
MAX
550
1.30
5.25
12.55
12.5
50
120
140
150
5.3
5.5
60
0.7
0.8
UNITS
µA
V
V
V
V
V
mV
mV
mV
kHz
kHz
µs
µs
%
V
V
2
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