LT1109 Linear Technology, LT1109 Datasheet - Page 2

• Manufacturer Part Number: LT1109
• Description: Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V/ 12V
• Manufacturer: Linear Technology

LT1109
A
(Voltages Referred to GND Pin)
Supply Voltage (V
SW Pin Voltage .......................................... – 0.4V to 50V
SHUTDOWN Pin Voltage......................................... 6.0V
Maximum Power Dissipation ............................. 300mW
PACKAGE/ORDER I FOR ATIO
2
ELECTRICAL C
SYMBOL
I
V
V
f
t
DC
V
Q
OSC
ON
IN
OUT
CESAT
BSOLUTE
GND
VIN
SW
NC
1
2
3
4
8-LEAD PLASTIC DIP
T
PARAMETER
Quiescent Current
Minimum Start-Up Voltage
at V
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
LT1109CN8
LT1109CN8-5
LT1109CN8-12
JMAX
N8 PACKAGE
ORDER PART
TOP VIEW
OUT
= 100 C,
NUMBER
Pin (Z Package)
OUT
W
JA
A
) .............................. – 0.4V to 20V
HARA TERISTICS
8
7
6
5
= 130 C/W
XI
SENSE
SHUTDOWN
NC
NC
LT1109 • PO102
W
U
C
U
W
R
CONDITIONS
Switch Off
LT1109
LT1109-5; 3V V
LT1109-12; 3V V
LT1109
LT1109-5
LT1109-12
I
LT1109-5: V
Full Load
SW
A
= 500mA
W
ORDER PART
LT1109CS8
LT1109CS8-5
LT1109CS8-12
TI
NUMBER
GND
U
SW
V
NC
IN
IN
G
= 3V; LT1109-12: V
8-LEAD PLASTIC SOIC
1
2
3
4
T
T
S
JMAX
A
IN
S8 PACKAGE
IN
U
TOP VIEW
= 25 C, V
= 100 C,
5V
12V
JA
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
IN
= 150 C/W
IN
8
7
6
5
= 3V (LT1109CN8, LT1109CS8), unless otherwise specified.
= 5V
MARKING
S8 PART
SENSE
SHUTDOWN
NC
NC
1109
10905
10912
LT1109 • PO103
11.52
1.20
4.75
MIN
100
1.6
3.3
3.0
90
45
3
12.00
TYP
1.25
5.00
320
120
4.2
0.4
0.5
25
60
50
T
8
JMAX
3-LEAD TO-92 PLASTIC
LT1109CZ-5
LT1109CZ-12
ORDER PART
V
OUT
3
= 100 C,
BOTTOM VIEW
NUMBER
Z PACKAGE
SW
2
12.55
MAX
1.30
5.25
12.5
JA
550
120
140
150
5.3
5.5
0.7
0.8
60
50
= 160 C/W
GND
1
LT1109 • POI01
UNITS
kHz
kHz
mV
mV
mV
%
A
V
V
V
V
V
V
V
s
s