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LT1107 Datasheet(PDF) 5 Page - Linear Technology

Part No. LT1107
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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LT1107 Datasheet(HTML) 5 Page - Linear Technology

 
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5
LT1107
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.
GND (Pin 5): Ground.
AO (Pin 6): Auxiliary Gain Block (GB) Output. Open collector,
can sink 300
µA.
SET (Pin 7): GB Input. GB is an op amp with positive input
connected to SET pin and negative input connected to
1.25V reference.
FB/SENSE (Pin 8): On the LT1107 (adjustable), this pin
goes to the comparator input. On the LT1107-5 and
LT1107-12, this pin goes to the internal application resistor
that sets output voltage.
PI
FU C
S
TI
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
Minimum/Maximum Frequency
Minimum/Maximum Frequency
Duty Cycle
vs ON Time, Step-Down Mode
vs ON Time, Step-Up Mode
Step-Down Mode
TEMPERATURE (°C)
–55
–15
25
45
125
1107 G13
–35
5
65
85 105
70
65
60
55
50
45
40
35
TEMPERATURE (°C)
–55
–15
25
45
125
1107 G16
–35
5
65
85 105
5.3
5.2
5.1
5.0
4.9
4.8
4.7
TEMPERATURE (°C)
–55
–15
25
45
125
1107 G17
–35
5
65
85 105
12.20
12.15
12.10
12.05
12.00
11.95
11.90
11.85
11.80
LT1107-5
LT1107-12
LT1107
Output Voltage
Output Voltage
Feedback Voltage
TEMPERATURE (°C)
–55
–15
25
45
125
1107 G18
–35
5
65
85 105
1.30
1.29
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.20
ON TIME (
µs)
4
100
90
80
70
60
50
40
30
5
9
11
1107 G11
8
13 14
6
7
10
12
–55
°C ≤ TA ≤ 125°C
0
°C ≤ TA ≤ 70°C
ON TIME (
µs)
6
100
90
80
70
60
50
40
30
7
11
13
1107 G12
10
15 16
8
9
12
14
–55
°C ≤ TA ≤ 125°C
0
°C ≤ TA ≤ 70°C
TA = 25°C


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