LT1372/LT1377
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
C
1
FB 2
NFB 3
S/S 4
N8 PACKAGE
8-LEAD PDIP
8
7
6
5
V
SW
GND
GND S
V
IN
Supply Voltage ....................................................... 30V
Switch Voltage
LT1372/LT1377 .................................................. 35V
LT1372HV .......................................................... 42V
S/S Pin Voltage ....................................................... 30V
Feedback Pin Voltage (Transient, 10ms) ..............
±10V
Feedback Pin Current ........................................... 10mA
Negative Feedback Pin Voltage
(Transient, 10ms) .............................................
±10V
Operating Junction Temperature Range
Commercial ........................................ 0°C to 125°C*
Industrial ......................................... – 40°C to 125°C
Short Circuit ......................................... 0°C to 150°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART NUMBER
LT1372CN8
LT1372HVCN8
LT1372CS8
LT1372HVCS8
LT1372IN8
1372
1372I
LT1372HVIN8
LT1372IS8
LT1372HVIS8
LT1377CS8
LT1377IS8
1377
1377I
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
1372H
1372HI
T
JMAX
= 125°C,
θ
JA
= 100°C/ W (N8)
T
JMAX
= 125°C,
θ
JA
= 120°C/ W (S8)
Consult factory for Military grade parts.
*Units shipped prior to Date Code 9552 are rated at 100°C maximum
operating temperature.
ELECTRICAL CHARACTERISTICS
V
IN
= 5V, V
C
= 0.6V, V
FB
= V
REF
, V
SW
, S/S and NFB pins open, unless otherwise noted.
SYMBOL
V
REF
I
FB
PARAMETER
Reference Voltage
Feedback Input Current
Reference Voltage Line Regulation
V
NFB
I
NFB
Negative Feedback Reference Voltage
Negative Feedback Input Current
Negative Feedback Reference Voltage
Line Regulation
g
m
Error Amplifier Transconductance
Error Amplifier Source Current
Error Amplifier Sink Current
Error Amplifier Clamp Voltage
A
V
f
Error Amplifier Voltage Gain
V
C
Pin Threshold
Switching Frequency
Duty Cycle = 0%
2.7V
≤
V
IN
≤
25V
LT1372
0°C
≤
T
J
≤
125°C
– 40°C
≤
T
J
< 0°C (I Grade)
LT1377
0°C
≤
T
J
≤
125°C
– 40°C
≤
T
J
< 0°C (I Grade)
0.8
450
430
400
0.90
0.86
0.80
CONDITIONS
Measured at Feedback Pin
V
C
= 0.8V
V
FB
= V
REF
q
q
MIN
1.230
1.225
TYP
1.245
1.245
250
MAX
1.260
1.265
550
900
0.03
– 2.440
– 2.410
– 15
0.05
1900
2300
350
2400
2.30
0.52
1.25
550
580
580
1.10
1.16
1.16
UNITS
V
V
nA
nA
%/V
V
V
µA
%/V
µmho
µmho
µA
µA
V
V
V/ V
V
kHz
kHz
kHz
MHz
MHz
MHz
2.7V
≤
V
IN
≤
25V, V
C
= 0.8V
Measured at Negative Feedback Pin
Feedback Pin Open, V
C
= 0.8V
V
NFB
= V
NFR
2.7V
≤
V
IN
≤
25V, V
C
= 0.8V
∆I
C
=
±25µA
q
0.01
– 2.490
– 2.490
– 30
0.01
1100
700
120
1.70
0.25
1500
200
1400
1.95
0.40
500
1
500
500
1
1
– 2.540
q
– 2.570
q
q
– 45
q
V
FB
= V
REF
– 150mV, V
C
= 1.5V
V
FB
= V
REF
+ 150mV, V
C
= 1.5V
High Clamp, V
FB
= 1V
Low Clamp, V
FB
= 1.5V
q
q
q
q
2
U
W
U
U
W W
W
LINER [ LINEAR TECHNOLOGY ]
