LT11
11
ELECTRICAL CHARACTERISTICS
SYMBOL
I
FB
I
SET
V
OL
PARAMETER
Feedback Pin Bias Current
Set Pin Bias Current
Gain Block Output Low
Reference Line Regulation
A
V
I
LIM
Gain Block Gain
Current Limit
Current Limit Temperature Coefficient
Switch OFF Leakage Current
Maximum Excursion Below GND
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.V
IN
= 3V, Military or Commercial Version
CONDITIONS
LT1111, V
FB
= 0V
V
SET
= V
REF
I
SINK
= 300µA, V
SET
= 1.00V
5V
≤
V
IN
≤
30V
2V
≤
V
IN
≤
5V
R
L
= 100k (Note 4)
220Ω from I
LIM
to V
IN
q
q
q
q
q
q
MIN
TYP
70
70
0.15
0.02
0.20
MAX
120
300
0.4
0.075
0.400
UNITS
nA
nA
V
%/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
The
q
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
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
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
This specification guarantees that both the high and low trip points
of the comparator fall within the 1.20V to 1.30V range.
Note 3:
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 4:
100k resistor connected between a 5V source and the A0 pin.
1111fd
3
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