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LT1110 Datasheet(PDF) 5 Page - Linear Technology

Part No. LT1110
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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LT1110 Datasheet(HTML) 5 Page - Linear Technology

 
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LT1110
5
I
DAGRA
BLOCK
LT1110
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
Set Pin Bias Current
FB Pin Bias Current
Reference Voltage
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
220mV reference.
FB/SENSE (Pin 8): On the LT1110 (adjustable) this pin
goes to the comparator input. On the LT1110-5 and
LT1110-12, this pin goes to the internal application resistor
that sets output voltage.
PI
FU C
S
TI
TEMPERATURE (
°C)
–50
LT1110 • TPC13
160
140
120
100
60
–25
20
0
40
80
0
25
50
75
100
TEMPERATURE (
°C)
–50
–25
0
25
LT1110 • TPC15
50
75
100
226
224
222
220
218
216
214
212
TEMPERATURE (
°C)
–50
120
100
90
70
40
–25
10
0
30
60
0
25
50
75
100
20
50
80
110
LT1110 • TPC14
LT1110 • BD01
IN
V
GND
SET
AO
GAIN BLOCK/ERROR AMP
220mV
REFERENCE
A1
A2
DRIVER
+
FB
SW1
SW2
LIM
I
OSCILLATOR
COMPARATOR
Q1


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