LT1308 データシートの表示（PDF） - Linear Technology
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LT1308 Datasheet PDF : 8 Pages
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LT1308
ABSOLUTE AXI U RATI GS
VIN, SHDN, LBO Voltage ......................................... 10V
SW Voltage ............................................................. 30V
FB Voltage ....................................................... VIN + 1V
VC Voltage ................................................................ 2V
LBI Voltage ............................................ 0V ≤ VLBI ≤ 1V
Current into FB Pin .............................................. ±1mA
Junction Temperature ...........................................125°C
Operating Temperature Range
Commercial (Note 1) ......................... – 20°C to 70°C
Industrial ........................................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VC 1
FB 2
SHDN 3
GND 4
8 LBO
7 LBI
6 VIN
5 SW
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 80°C/W
ORDER PART
NUMBER
LT1308CS8
LT1308IS8
S8 PART MARKING
1308
1308I
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
Commercial Grade 0°C to 70°C. VIN = 1.1V, VSHDN = VIN, TA = 25°C, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
IQ
Quiescent Current
VFB
Feedback Voltage
IB
FB Pin Bias Current (Note 2)
Reference Line Regulation
Minimum Input Voltage
Not Switching
VSHDN = 0V
VFB = VREF
1.1V ≤ VIN ≤ 2V (25°C, 0°C)
1.1V ≤ VIN ≤ 2V (70°C)
2V ≤ VIN ≤ 6V
q
q
q 1.20
q
q
Input Voltage Range
q1
gm
Error Amp Transconductance
AV
Error Amp Voltage Gain
∆I = 5µA
25°C, 0°C
70°C
fOSC
Switching Frequency
Maximum Duty Cycle
q 500
q 80
Switch Current Limit (Note 3)
DC = 40%
DC = 80%
q 2.0
1.6
Switch VCESAT
Burst Mode Operation Switch Current Limit
Shutdown Pin Current
LBI Threshold Voltage
ISW = 2A (25°C, 0°C)
ISW = 2A (70°C)
L = 3.3µH, VOUT = 3.3V, VIN = 1.2V
VSHDN = 1.1V
VSHDN = 6V
VSHDN = 0V
q
q
q 180
LBO Output Low
LBO Leakage Current
LBI Input Bias Current (Note 4)
ISINK = 10µA
q
VLBI = 250mV, VLBO = 5V
q
VLBI = 150mV
q
TYP
MAX UNITS
80
160
µA
1
3
µA
1.22
1.24
V
27
80
nA
0.6
1.1
%/V
1.5
%/V
0.3
0.8
%/V
0.92
1
V
6
V
40
µmhos
100
V/V
80
V/V
600
700
kHz
88
95
%
2.5
A
2
A
300
350
mV
330
400
mV
200
mA
2.5
4.0
µA
13
26
µA
– 1.5
– 2.5
µA
200
220
mV
0.1
0.25
V
0.01
0.1
µA
5
30
nA
2
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