2
LT1248
A
G
A
U
A
R
BSOLUTE    XI
TI   S
(Note 1)
Supply Voltage ....................................................... 27V
GTDR Current Continuous ..................................... 0.5A
GTDR Output Energy(Per Cycle).............................. 5礘
I
AC
, R
SET
, PK
LIM
Input Current............................. 20mA
V
SENSE
, EN/SYNC, OVP Input Voltage................... V
MAX
I
SENSE
, M
OUT
Input Current.................................. ?mA
Operating Junction Temperature Range
LT1248C................................................0癈 to 100癈
LT1248I ........................................... 40癈 to 125癈
Thermal Resistance (Junction-to-Ambient)
N Package .................................................. 100癈/W
S Package................................................... 120癈/W
Storage Temperature Range ..................65癈 to 150癈
Lead Temperature (Soldering, 10 sec)................. 300癈
U
U
PACKAGE/ORDER I FOR  ATIO
ELECTRICAL C
C
HARA TERISTICS
ORDER PART
NUMBER
The q denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25?/SPAN>C. Maximum operating voltage (V
MAX
) = 25V, V
CC
= 18V, R
SET
= 15k to GND,
C
SET
= 1nF to GND, I
AC
= 100?/SPAN>A, I
SENSE
= 0V, CA
OUT
= 3.5V, VA
OUT
= 5V, OVP = 7.5V, no load on any outputs, unless otherwise noted.
LT1248CN
LT1248IN
LT1248CS
LT1248IS
T
JMAX
= 125癈, ?/DIV>
JA
= 100癈/W (N)
T
JMAX
= 125癈, ?/DIV>
JA
= 120癈/W (S)
Consult factory for Military grade parts.
1
2
3
4
5
6
7
8
TOP VIEW
N PACKAGE
16-LEAD PDIP
S PACKAGE
16-LEAD NARROW PLASTIC SO
16
15
14
13
12
11
10
9
GND
PK
LIM
CA
OUT
I
SENSE
M
OUT
I
AC
VA
OUT
OVP
GTDR
V
CC
C
SET
SS
R
SET
V
SENSE
EN/SYNC
V
REF
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Overall
Supply Current (V
CC
in Undervoltage Lockout)
V
CC
= Lockout Voltage 0.2V
q
0.25
0.45
mA
Supply Current (Inactive)
EN/SYNC = 0V, V
CC
d V
MAX
q
0.5
1.5
mA
Supply Current, On
11.5V d V
CC
d V
MAX
, CA
OUT
= 1V
q
8.5
12.0
mA
V
CC
Turn-On Threshold (Undervoltage Lockout)
q
15.5
16.5
17.5
V
V
CC
Turn-Off Threshold
q
9.5
10.5
11.5
V
EN/SYNC Threshold, Rising
q
2.2
2.6
2.85
V
EN/SYNC Threshold Hysteresis
0.40
V
EN/SYNC Input Current
EN/SYNC = 0V
q
5
1
5
礎(chǔ)
3V d EN/SYNC d 7V
50
25
50
礎(chǔ)
Voltage Amplifier
Voltage Amp Offset Voltage
VA
OUT
= 3.5V
q
8
8
mV
Input Bias Current
V
SENSE
= 0V to 7V
q
25
250
nA
Voltage Gain
70
100
dB
Voltage Amp Unity-Gain Bandwidth
3
MHz
Voltage Amp Output High (Internally Clamped)
q
11.3
13.3
V
Voltage Amp Output Low
q
1.1
2
V
Voltage Amp Short-Circuit Current
VA
OUT
= 0V
q
5
14
30
mA
SS Current
SS = 2.5V
q
5
12
30
礎(chǔ)
Current Amplifier
Current Amp Offset Voltage
q
?
?
mV
I
SENSE
Bias Current
q
25
250
nA
Current Amp Voltage Gain
80
110
dB
Current Amp Unity-Gain Bandwidth
3
MHz
Current Amp Output High
q
7.2
8.5
V
Current Amp Output Low
q
1.1
2
V
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