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LT1108 Datasheet(PDF) 4 Page - Linear Technology

Part No. LT1108
Description  Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1108 Datasheet(HTML) 4 Page - Linear Technology

 
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4
LT1108
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
GND (Pin 5): Ground.
AO (Pin 6): Auxiliary gain block (GB) output. Open collector,
can sink 100
µA.
SET (Pin 7): GB input. GB is an op amp with positive input
connected to SET pin and negative input connected to
1.245V reference.
FB/SENSE (Pin 8): On the LT1108 (adjustable) this pin
goes to the comparator input. On the LT1108-5 and
LT1108-12, this pin goes to the internal application resistor
that sets output voltage.
Oscillator Frequency
Duty Cycle
Switch-ON Time
TEMPERATURE (°C)
13
14
16
17
18
22
LT1108 • TPC07
15
19
20
21
–50
25
75
–25
0
50
100
TEMPERATURE (°C)
50
55
60
65
70
80
LT1108 • TPC08
75
–50
25
75
–25
0
50
100
Minimum/Maximum Frequency
Switch Saturation Voltage
Switch Saturation Voltage
vs ON-Time
Step-Up Mode
Step-Down Mode
PI
FU C
S
TI
ILIM (Pin 1): Connect this pin to VIN for normal use. Where
lower current limit is desired, connect a resistor between
ILIM and VIN. A 220Ω resistor will limit the switch current
to approximately 400mA.
VIN (Pin 2): Input supply voltage.
SW1 (Pin 3): Collector of power transistor. For step-up
mode connect to inductor/diode. For step-down mode
connect to VIN.
SW2 (Pin 4): Emitter of power transistor. For step-up
mode connect to ground. For step-down mode connect to
inductor/diode. This pin must never be allowed to go more
than a Schottky diode drop below ground.
TEMPERATURE (˚C)
–50
38
40
42
25
75
LT1108 • TPC09
36
34
–25
0
50
100
32
30
44
TEMPERATURE (°C)
–50
0.3
0.4
0.5
25
75
LT1108 • TPC11
0.2
0.1
0
–25
0
50
0.6
0.7
0.8
100
ISW = 650mA
TEMPERATURE (°C)
–50
0.8
1.0
1.1
1.2
1.3
1.4
1.5
–25
0
25
50
LT1108 • TPC12
75
1.6
1.7
1.8
0.9
100
ISW = 650mA
ON-TIME (
µs)
25
20
24
28
45
LT1108 • TPC10
16
12
0
30
35
40
50
18
22
26
14
10


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