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LT1107 Datasheet(PDF) 3 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) 3 Page - Linear Technology

 
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LT1107
ELECTRICAL C
C
HARA TERISTICS
VIN = 3V, military or commercial version, TA = 25°C, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
AV
Gain Block Gain
RL = 100k (Note 3)
q
1000
6000
V/V
Current Limit
220
Ω to ILIM to VIN
400
mA
Current Limit Temperature Coefficient
q
– 0.3
%/
°C
Switch OFF Leakage Current
Measured at SW1 Pin, VSW1 = 12V
1
10
µA
VSW2
Maximum Excursion Below GND
ISW1 ≤ 10µA, Switch OFF
– 400
– 350
mV
VIN = 3V, – 55°C ≤ TA ≤ 125°C, unless otherwise noted.
LT1107C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Quiescent Current
Switch OFF
q
450
µA
fOSC
Oscillator Frequency
q
50
63
88
kHz
DC
Duty Cycle
Step-Up Mode
q
62
69
78
%
Step-Down Mode, VIN = 12V
q
50
60
70
%
tON
Switch ON Time
Step-Up Mode
q
8
11
13.5
µs
Step-Down Mode, VIN = 12V
q
6
9
12.0
µs
Reference Line Regulation
2V
≤ VIN ≤ 5V
q
0.2
0.7
%/V
VSAT
Switch Saturation Voltage, Step-Up Mode
VIN = 3V, ISW = 650mA
q
0.5
0.65
V
Switch Saturation Voltage, Step-Down Mode
VIN = 12V, ISW = 650mA
q
1.1
1.5
V
LT1107M
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Quiescent Current
Switch OFF
q
500
µA
fOSC
Oscillator Frequency
q
40
63
95
kHz
DC
Duty Cycle
Step-Up Mode
q
56
69
81
%
Step-Down Mode, VIN = 12V
q
45
60
73
%
tON
Switch ON Time
Step-Up Mode
q
711
15
µs
Step-Down Mode, VIN = 12V
q
59
13
µs
Reference Line Regulation
2V
≤ VIN ≤ 5V, 0°C ≤ TA ≤ 125°C
0.2
0.4
%/V
2.4V
≤ VIN ≤ 5V, TA = –55°C
0.8
%/V
VSAT
Switch Saturation Voltage, Step-Up Mode
0
°C ≤ TA ≤ 125°C, ISW = 500mA
0.5
0.65
V
TA = – 55°C, ISW = 400mA
0.5
0.65
V
Switch Saturation Voltage, Step-Down Mode
VIN = 12V, ISW = 500mA
0
°C ≤ TA ≤ 125°C
1.5
V
TA = – 55°C
2.0
V
VIN = 3V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.
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.
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 AO pin.


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