LT1375/LT1376
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. T
J
= 25°C, V
IN
= 15V, V
C
= 1.5V, boost open, switch open,
unless otherwise noted.
PARAMETER
Reference Voltage (Adjustable)
All Conditions
Sense Voltage (Fixed 5V)
All Conditions
Sense Pin Resistance
Reference Voltage Line Regulation
Feedback Input Bias Current
Error Amplifier Voltage Gain
Error Amplifier Transconductance
V
C
Pin to Switch Current Transconductance
Error Amplifier Source Current
Error Amplifier Sink Current
V
C
Pin Switching Threshold
V
C
Pin High Clamp
Switch Current Limit
V
BOOST
= V
IN
+ 5V
Switch On Resistance (Note 6)
Maximum Switch Duty Cycle
V
SHDN
= 1V, V
FB
= 2.1V or V
SENSE
= 4.4V
V
SHDN
= 1V, V
FB
= 2.7V or V
SENSE
= 5.6V
Duty Cycle = 0
V
SHDN
= 1V
V
C
Open, V
FB
= 2.1V or V
SENSE
= 4.4V,
DC
≤
50%
DC = 80%
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
2.39
2.36
4.94
4.90
7
TYP
2.42
5.0
10
0.01
0.01
MAX
2.45
2.48
5.06
5.10
14
0.03
0.03
1.5
2700
3000
320
UNITS
V
V
V
V
kΩ
%/ V
%/V
µA
µMho
µMho
A/ V
µA
mA
V
V
5V
≤
V
IN
≤
25V
5V
≤
V
IN
≤
30V (LT1375HV/LT1376HV)
q
0.5
200
400
2000
2
150
225
2
0.9
2.1
1.50
1.35
2
0.3
90
86
85
460
440
440
93
93
93
500
1500
1100
V
SHDN
= 1V (Notes 2, 8)
V
SHDN
= 1V,
∆I
(V
C
) =
±10µA
(Note 8)
q
3
3
0.4
0.5
A
A
Ω
Ω
%
%
%
I
SW
= 1.5A, V
BOOST
= V
IN
+ 5V
V
FB
= 2.1V or V
SENSE
= 4.4V
– 40°C
≤
T
J
≤
125°C
T
J
= 150°C
– 25°C
≤
T
J
≤
125°C
T
J
≤
– 25°C
q
q
q
q
Switch Frequency
V
C
Set to Give 50% Duty Cycle
540
560
570
0.15
0.15
1.3
5.5
3.5
22
35
1.4
4.0
50
75
75
100
2.46
kHz
kHz
kHz
%/ V
%/V
V
V
V
mA
mA
mA
mA
µA
µA
µA
µA
V
Switch Frequency Line Regulation
Frequency Shifting Threshold on FB Pin
Minimum Input Voltage (Note 3)
Minimum Boost Voltage (Note 4)
Boost Current (Note 5)
Input Supply Current (Note 6)
Output Supply Current (Note 6)
Shutdown Supply Current
5V
≤
V
IN
≤
25V
5V
≤
V
IN
≤
30V (LT1375HV/LT1376HV)
∆f
= 10kHz
I
SW
≤
1.5A
V
BOOST
= V
IN
+ 5V
V
BIAS
= 5V
V
BIAS
= 5V
V
SHDN
= 0V, V
IN
≤
25V, V
SW
= 0V, V
C
Open
I
SW
= 500mA
I
SW
= 1.5A
0.05
0.05
0.8
1.0
5.0
3
12
25
0.9
3.2
15
q
q
q
q
q
q
V
SHDN
= 0V, V
IN
≤
30V, V
SW
= 0V, V
C
Open
(LT1375HV/LT1376HV)
q
20
q
Lockout Threshold
V
C
Open
2.3
2.38
3
LINER [ LINEAR TECHNOLOGY ]
