LT1074/LT1076
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. T
j
= 25°C, V
IN
= 25V, unless otherwise noted.
PARAMETER
Switch “On” Voltage (Note 2)
CONDITIONS
LT1074
I
SW
= 1A, T
j
≥
0°C
I
SW
= 1A, T
j
< 0°C
I
SW
= 5A, T
j
≥
0°C
I
SW
= 5A, T
j
< 0°C
I
SW
= 0.5A
I
SW
= 2A
V
IN
≤
25V, V
SW
= 0
V
IN
= V
MAX,
V
SW
= 0 (Note 8)
V
IN
= 25V, V
SW
= 0
V
IN
= V
MAX,
V
SW
= 0 (Note 8)
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
MIN
TYP
MAX
1.85
2.1
2.3
2.5
1.2
1.7
UNITS
V
V
V
V
V
V
µA
µA
µA
µA
mA
mA
µA
V
V
A
A
A
A
A
A
%
kHz
kHz
kHz
kHz
%/V
V/V
µmho
µA
mA
µA
V
%
%
%/V
V
mV/°C
V
LT1076
Switch “Off” Leakage
LT1074
LT1076
Supply Current (Note 3)
5
10
300
500
150
250
V
FB
= 2.5V, V
IN
≤
40V
40V < V
IN
< 60V
V
SHUT
= 0.1V (Device Shutdown) (Note 9)
Normal Mode
Startup Mode (Note 4)
LT1074
I
LIM
Open
R
LIM
= 10k (Note 6)
R
LIM
= 7k (Note 6)
I
LIM
Open
R
LIM
= 10k (Note 6)
R
LIM
= 7k (Note 6)
8.5
9
140
7.3
3.5
5.5
6.5
4.5
3
2.6
1.8
1.2
90
100
11
12
300
8
4.8
8.5
Minimum Supply Voltage
Switch Current Limit (Note 5)
LT1076
q
2
3.2
Maximum Duty Cycle
Switching Frequency
T
j
≤
125°C
T
j
> 125°C
V
FB
= 0V through 2kΩ (Note 5)
Switching Frequency Line Regulation
Error Amplifier Voltage Gain (Note 7)
Error Amplifier Transconductance
Error Amplifier Source and Sink Current
Feedback Pin Bias Current
Reference Voltage
Reference Voltage Tolerance
Source (V
FB
= 2V)
Sink (V
FB
= 2.5V)
V
FB
= V
REF
V
C
= 2V
V
REF
(Nominal) = 2.21V
All Conditions of Input Voltage, Output
Voltage, Temperature and Load Current
8V
≤
V
IN
≤
V
MAX
(Note 8)
Over Temperature
Multiplier Reference Voltage
Shutdown Pin Current
Shutdown Thresholds
Thermal Resistance Junction to Case
V
SH
= 5V
V
SH
≤
V
THRESHOLD
(≅2.5V)
Switch Duty Cycle = 0
Fully Shut Down
LT1074
LT1076
8V
≤
V
IN
≤
V
MAX
(Note 8)
1V
≤
V
C
≤
4V
q
q
q
q
85
90
85
85
110
120
125
0.1
8000
225
1.6
2
2.265
±1.5
±2.5
0.02
20
0.03
2000
3700
100
0.7
q
q
q
q
q
5000
140
1
0.5
2.21
±0.5
±1
0.005
1.5
–4
24
2.155
Reference Voltage Line Regulation
V
C
Voltage at 0% Duty Cycle
q
q
q
q
5
2.2
0.1
10
2.45
0.3
20
50
2.7
0.5
2.5
4.0
µA
µA
V
V
°C/W
°C/W
3
LINER [ LINEAR TECHNOLOGY ]
