LT1308A/LT1308B
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
I
Q
Quiescent Current
The
●
denotes specifications which apply over the full operating temperature
range, otherwise specifications are T
A
= 25°C. Commercial Grade 0°C to 70°C. V
IN
= 1.1V, V
SHDN
= V
IN
, unless otherwise noted.
CONDITIONS
Not Switching, LT1308A
Switching, LT1308B
V
SHDN
= 0V (LT1308A/LT1308B)
●
MIN
TYP
140
2.5
0.01
MAX
240
4
1
1.24
80
0.4
0.2
1
UNITS
μA
mA
μA
V
nA
%/V
%/V
V
μmhos
V/V
V
FB
I
B
Feedback Voltage
FB Pin Bias Current
Reference Line Regulation
Minimum Input Voltage
(Note 3)
1.1V
≤
V
IN
≤
2V
2V
≤
V
IN
≤
10V
ΔI
= 5μA
V
IN
= 1.2V
Duty Cyle = 30% (Note 4)
I
SW
= 2A (25°C, 0°C), V
IN
= 1.5V
I
SW
= 2A (70°C), V
IN
= 1.5V
V
IN
= 2.5V, Circuit of Figure 1
V
SHDN
= 1.1V
V
SHDN
= 6V
V
SHDN
= 0V
1.20
1.22
27
0.03
0.01
0.92
60
100
●
●
g
m
A
V
f
OSC
Error Amp Transconductance
Error Amp Voltage Gain
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
Switch V
CESAT
Burst Mode Operation Switch Current Limit
(LT1308A)
Shutdown Pin Current
●
●
500
82
2
600
90
3
290
330
400
700
4.5
350
400
kHz
%
A
mV
mV
mA
●
●
●
●
2
20
0.01
196
194
200
200
0.1
0.01
33
3000
5
35
0.1
204
206
0.25
0.1
100
10
μA
μA
μA
mV
mV
V
μA
nA
V/V
μA
LBI Threshold Voltage
LBO Output Low
LBO Leakage Current
LBI Input Bias Current (Note 5)
Low-Battery Detector Gain
Switch Leakage Current
V
SW
= 5V
●
I
SINK
= 50μA
V
LBI
= 250mV, V
LBO
= 5V
V
LBI
= 150mV
●
●
0.01
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
Industrial Grade – 40°C to 85°C. V
IN
= 1.2V, V
SHDN
= V
IN
, unless otherwise noted.
SYMBOL PARAMETER
I
Q
Quiescent Current
CONDITIONS
Not Switching, LT1308A
Switching, LT1308B
V
SHDN
= 0V (LT1308A/LT1308B)
(Note 3)
1.1V
≤
V
IN
≤
2V
2V
≤
V
IN
≤
10V
ΔI
= 5μA
●
●
●
●
●
●
●
MIN
TYP
140
2.5
0.01
MAX
240
4
1
1.25
80
0.4
0.2
1
UNITS
μA
mA
μA
V
nA
%/V
%/V
V
μmhos
V/V
V
FB
I
B
Feedback Voltage
FB Pin Bias Current
Reference Line Regulation
Minimum Input Voltage
1.19
1.22
27
0.05
0.01
0.92
60
100
g
m
A
V
Error Amp Transconductance
Error Amp Voltage Gain
1308abfa
3
LINER [ LINEAR TECHNOLOGY ]
