LT1248 データシートの表示（PDF） - Linear Technology
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LT1248 Datasheet PDF : 12 Pages
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LT1248
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage ....................................................... 27V
GTDR Current Continuous ..................................... 0.5A
GTDR Output Energy(Per Cycle) .............................. 5µJ
IAC, RSET, PKLIM Input Current ............................. 20mA
VSENSE, EN/SYNC, OVP Input Voltage ................... VMAX
ISENSE, MOUT Input Current .................................. ± 5mA
Operating Junction Temperature Range
LT1248C ................................................ 0°C to 100°C
LT1248I ........................................... – 40°C to 125°C
Thermal Resistance (Junction-to-Ambient)
N Package .................................................. 100°C/W
S Package ................................................... 120°C/W
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
GND 1
PKLIM 2
CAOUT 3
ISENSE 4
MOUT 5
IAC 6
VAOUT 7
OVP 8
16 GTDR
15 VCC
14 CSET
13 SS
12 RSET
11 VSENSE
10 EN/SYNC
9 VREF
N PACKAGE
16-LEAD PDIP
S PACKAGE
16-LEAD NARROW PLASTIC SO
TJMAX = 125°C, θJA = 100°C/W (N)
TJMAX = 125°C, θJA = 120°C/W (S)
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1248CN
LT1248IN
LT1248CS
LT1248IS
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at TA = 25°C. Maximum operating voltage (VMAX) = 25V, VCC = 18V, RSET = 15k to GND,
CSET = 1nF to GND, IAC = 100µA, ISENSE = 0V, CAOUT = 3.5V, VAOUT = 5V, OVP = 7.5V, no load on any outputs, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Overall
Supply Current (VCC in Undervoltage Lockout)
Supply Current (Inactive)
VCC = Lockout Voltage – 0.2V
q
EN/SYNC = 0V, VCC ≤ VMAX
q
0.25 0.45
mA
0.5
1.5
mA
Supply Current, On
VCC Turn-On Threshold (Undervoltage Lockout)
VCC Turn-Off Threshold
EN/SYNC Threshold, Rising
11.5V ≤ VCC ≤ VMAX, CAOUT = 1V
q
8.5
12.0
mA
q 15.5 16.5 17.5
V
q
9.5
10.5 11.5
V
q 2.2
2.6
2.85
V
EN/SYNC Threshold Hysteresis
0.40
V
EN/SYNC Input Current
EN/SYNC = 0V
3V ≤ EN/SYNC ≤ 7V
q –5
–1
5
µA
– 50 – 25
50
µA
Voltage Amplifier
Voltage Amp Offset Voltage
Input Bias Current
Voltage Gain
VAOUT = 3.5V
VSENSE = 0V to 7V
q –8
8
mV
q
– 25 – 250
nA
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
SS Current
VAOUT = 0V
SS = 2.5V
q
5
14
30
mA
q
5
12
30
µA
Current Amplifier
Current Amp Offset Voltage
q
±1
±4
mV
ISENSE Bias Current
Current Amp Voltage Gain
q
– 25 – 250
nA
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
2
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