LT1373
W W U W
U W
U
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
Supply Voltage ....................................................... 30V
Switch Voltage
ORDER PART
TOP VIEW
NUMBER
V
1
2
3
4
V
SW
8
7
6
5
LT1373 ............................................................... 35V
LT1373HV .......................................................... 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
C
LT1373CN8
LT1373IN8
FB
NFB
S/S
GND
LT1373HVCN8
LT1373CS8
LT1373HVIN8
LT1373IS8
GND S
V
IN
LT1373HVCS8
LT1373HVIS8
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART MARKING
TJMAX = 125°C, θJA = 100°C/ W (N8)
TJMAX = 125°C, θJA = 120°C/ W (S8)
1373
1373H
1373I 1373HI
Consult factory for Military grade parts.
*Units shipped prior to Date Code 9552 are rated at 100°C maximum
operating temperature.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S and NFB pins open, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Reference Voltage
Measured at Feedback Pin
V = 0.8V
C
1.230
1.225
1.245
1.245
1.260
1.265
V
V
REF
●
I
Feedback Input Current
V
= V
REF
50
150
275
nA
nA
FB
FB
●
●
Reference Voltage Line Regulation
Negative Feedback Reference Voltage
2.7V ≤ V ≤ 25V, V = 0.8V
0.01
0.03
%/V
IN
C
V
Measured at Negative Feedback Pin
Feedback Pin Open, V = 0.8V
–2.51
–2.55
–2.45
–2.45
–2.39
–2.35
V
V
NFB
●
●
●
C
I
Negative Feedback Input Current
V
= V
–12
–7
–2
µA
NFB
NFB
NFR
Negative Feedback Reference Voltage
Line Regulation
2.7V ≤ V ≤ 25V, V = 0.8V
0.01
0.05
%/V
IN
C
g
Error Amplifier Transconductance
∆I = ±5µA
250
150
375
500
600
µmho
µmho
m
C
●
●
●
Error Amplifier Source Current
Error Amplifier Sink Current
Error Amplifier Clamp Voltage
V
V
= V
– 150mV, V = 1.5V
25
50
90
µA
µA
FB
FB
REF
C
= V + 150mV, V = 1.5V
850
1500
REF
C
High Clamp, V = 1V
Low Clamp, V = 1.5V
1.70
0.25
1.95
0.40
2.30
0.52
V
V
FB
FB
A
f
Error Amplifier Voltage Gain
250
1
V/V
V
V
V Pin Threshold
C
Duty Cycle = 0%
0.8
1.25
Switching Frequency
2.7V ≤ V ≤ 25V
225
210
200
250
250
275
290
290
kHz
kHz
kHz
IN
0°C ≤ T ≤ 125°C
●
●
J
–40°C ≤ T ≤ 0°C (I Grade)
J
Maximum Switch Duty Cycle
90
95
%
Switch Current Limit Blanking Time
340
500
ns
2
Linear [ Linear ]
