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LT1173 Datasheet(PDF) 3 Page - Linear Technology

Part # LT1173
Description  Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1173 Datasheet(HTML) 3 Page - Linear Technology

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LT1173
3
VSAT
SWSAT Voltage, Step-Down Mode
VIN = 12V, ISW = 650mA
1.1
1.5
V
q
1.7
V
AV
Gain Block Gain
RL = 100kΩ (Note 3)
q
400
1000
V/V
Current Limit
220
Ω to ILIM to VIN
400
mA
Current Limit Temperature Coeff.
q
– 0.3
%/
°C
Switch OFF Leakage Current
Measured at SW1 Pin
1
10
µA
VSW2
Maximum Excursion Below GND
ISW1 ≤ 10µA, Switch Off
– 400
– 350
mV
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Note 2: The output voltage waveform will exhibit a sawtooth shape due to
the comparator hysteresis. The output voltage on the fixed output versions
will always be within the specified range.
Note 3: 100k
Ω resistor connected between a 5V source and the AO pin.
The q denotes the specifications which apply over the full operating
temperature range.
Note 1: This specification guarantees that both the high and low trip points
of the comparator fall within the 1.20V to 1.30V range.
ELECTRICAL C
C
HARA TERISTICS T
A = 25°C, VIN = 3V, unless otherwise noted.
Maximum Switch Current vs
Set Pin Bias Current vs
Feedback Pin Bias Current vs
RLIM Step-Down Mode
Temperature
Temperature
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
I
(A)
0
0
0.2
0.4
0.6
1.0
1.2
0.2
0.4
0.6
0.8
LT1173 • TPC01
0.8
1.0
1.2
SWITCH
V = 5.0V
IN
V = 3.0V
IN
V = 2.0V
IN
I
(A)
0
0.7
0.8
0.9
1.1
1.3
1.4
0.1
0.2
0.3
0.4
LT1173 • TPC02
1.2
0.5
0.6
SWITCH
0.7
0.8
1.0
Switch ON Voltage
Saturation Voltage Step-Up Mode
Step-Down Mode
Maximum Switch Current vs
(SW2 Pin Grounded)
(SW1 Pin Connected to VIN)RLIM Step-Up Mode
TEMPERATURE (°C)
–50
10
15
20
–25
0
25
50
LT1173 •TPC04
75
100
125
V
= 3V
IN
5
TEMPERATURE (°C)
–50
14
16
18
–25
0
25
50
LT1173 •TPC05
75
100
125
V
= 3V
IN
12
10
8
R
( )
100
0
400
800
1000
LT1173 • TPC09
900
700
600
500
300
200
LIM
1000
VOUT = 5V
100
VIN = 24V
L = 500
µH
VIN = 12V
L = 250
µH
R
( )
10
100
400
800
1200
100
LT1173 • TPC03
1000
900
700
600
500
300
200
LIM
1000
1100
2V
≤ V
IN ≤ 5V


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