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LT1108 Datasheet(PDF) 3 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) 3 Page - Linear Technology

 
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LT1108
TA = 25°C, VIN = 3V, unless otherwise noted.
ELECTRICAL C
C
HARA TERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VSAT
SWSAT Voltage, Step-Down Mode
VIN = 12V, ISW = 650mA
1.1
1.5
V
q
1.7
V
AV
Gain Block Gain
RL = 100k (Note 3)
q
400
1000
V/ V
Current Limit
220
Ω from ILIM to VIN
400
mA
Current Limit Temperature Coefficient
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
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 resistor connected between a 5V source and the A0 pin.
The q denotes 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 1.2V to 1.3V range.
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
RLIM (Ω)
10
100
1000
LT1108 • TPC03
1000
1200
1100
900
800
700
600
500
400
300
200
100
2V
≤ VIN ≤ 5V
Saturation Voltage Step-Up Mode
(SW2 Pin Grounded)
Switch ON Voltage
Step-Down Mode
(SW1 Pin Connected to VIN)
Maximum Switch Current
vs RLIM
Saturation Voltage Step-Up Mode
(SW2 Pin Grounded)
R LIM (Ω)
100
0
200
400
600
800
1000
LT1108 • TPC04
100
300
500
700
900
1000
VOUT = 5V
VIN = 24V
L = 500
µH
VIN = 12V
L = 250
µH
Supply Current vs Switch Current
Quiescent Current
TEMPERATURE (°C)
–50
95
100
105
25
75
LT1108 • TPC06
90
85
80
–25
0
50
110
115
120
100
SWITCH CURRENT (A)
0
0
0.2
0.4
0.6
0.8
1.2
0.2
0.4
0.6
0.8
LT1108 • TPC01
1.0
1.2
1.0
VIN = 2V
VIN = 5V
VIN = 3V
SWITCH CURRENT (A)
0
1.1
1.2
1.3
0.6
LT1108 • TPC02
1.0
0.9
0.2
0.4
0.8
0.8
0.7
1.4
0.5
0.1
0.3
0.7
SWITCH CURRENT (mA)
0
30
40
50
800
LTC1108 • TPC05
20
10
0
200
400
600
1000
VIN = 5V
VIN = 2V


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