LT1111
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
Reference Line Regulation
A
V
I
LIM
Gain Block Gain
Current Limit
Current Limit Temperature Coefficient
Switch OFF Leakage Current
Maximum Excursion Below GND
V
IN
= 3V, Military or Commercial Version
CONDITIONS
5V
≤
V
IN
≤
30V
2V
≤
V
IN
≤
5V
R
L
= 100k (Note 3)
220Ω from I
LIM
to V
IN
q
q
q
MIN
TYP
0.02
0.20
MAX
0.075
0.400
UNITS
%/V
%/V
V/V
mA
%/
°C
1000
6000
400
– 0.3
1
– 400
10
– 350
Measured at SW1 Pin, V
SW1
= 12V
I
SW1
≤
10µA, Switch OFF
µA
mV
V
IN
= 3V, – 55°C
≤
T
A
≤
125°C unless otherwise noted.
SYMBOL
I
Q
f
OSC
DC
t
ON
PARAMETER
Quiescent Current
Oscillator Frequency
Duty Cycle: Step-Up Mode
Step-Down Mode
Switch ON Time: Step-Up Mode
Step-Down Mode
Reference Line Regulation
V
SAT
SW Saturation Voltage, Step-Up Mode
SW Saturation Voltage, Step-Down Mode
Full Load
I
LIM
Tied to V
IN
V
OUT
= 5V, V
IN
= 12V
2V
≤
V
IN
≤
5V, 25°C
≤
T
A
≤
125°C
2.4V
≤
V
IN
≤
5V, T
A
= – 55°C
0°C
≤
T
A
≤
125°C, I
SW
= 500mA,
T
A
= – 55°C, I
SW
= 400mA
V
IN
= 12V,
I
SW
= 500mA
0°C
≤
T
A
≤
125°C
T
A
= – 55°C
CONDITIONS
Switch OFF
q
q
q
q
q
q
MIN
45
40
20
5
3
LT1111M
TYP
300
72
50
7
0.2
0.5
MAX
500
100
62
55
11
9
0.4
0.8
0.65
1.5
2.0
UNITS
µA
kHz
%
%
µs
µs
%/V
%/V
V
V
V
V
IN
= 3V, 0°C
≤
T
A
≤
70°C unless otherwise noted.
SYMBOL
I
Q
f
OSC
DC
t
ON
PARAMETER
Quiescent Current
Oscillator Frequency
Duty Cycle: Step-Up Mode
Step-Down Mode
Switch ON Time: Step-Up Mode
Step-Down Mode
Reference Line Regulation
V
SAT
SW Saturation Voltage, Step-Up Mode
SW Saturation Voltage, Step-Down Mode
Full Load
I
LIM
Tied to V
IN
V
OUT
= 5V, V
IN
= 12V
2V
≤
V
IN
≤
5V
V
IN
= 3V, I
SW
= 650mA
V
IN
= 12V, I
SW
= 650mA
CONDITIONS
Switch OFF
q
q
q
q
q
q
q
q
q
MIN
300
54
43
24
5.0
3.3
LT1111C
TYP
72
50
34
7
5
0.2
0.5
1.1
MAX
450
95
59
50
9.0
7.8
0.7
0.65
1.50
UNITS
µA
kH
%
%
µs
µs
%/V
V
V
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 1.20V to 1.30V 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 A0 pin.
3
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