LT1268 查看數據表（PDF） - Linear Technology
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LT1268 Datasheet PDF : 4 Pages
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LT1268B/LT1268
ABSOLUTE AXI U RATI GS
Supply Voltage ....................................................... 30V
Switch Output Voltage ............................................ 60V
Feedback Pin Voltage (Transient, 1ms) ................ ±15V
Operating Junction Temperature Range
Operating ............................................... 0°C to 125°C
Short-Circuit ......................................... 0°C to 140°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER I FOR ATIO
FRONT VIEW
5
VIN
4
VSW
3
GND
2
FB
1
VC
Q PACKAGE
5-LEAD DD
TJMAX = 125°C, θJC = 2°C/ W, θJA = See Notes 5 and 6
FRONT VIEW
5
VIN
4
VSW
3
GND
2
FB
1
VC
T PACKAGE
5-LEAD TO-220
TJMAX = 125°C, θJC = 2°C/W, θJA = 50°C/W
Consult factory for Industrial and Military parts
ORDER PART
NUMBER
LT1268CQ
LT1268BCQ
ORDER PART
NUMBER
LT1268CT
LT1268BCT
ELECTRICAL CHARACTERISTICS VIN = 15V, VC = 0.5V, VFB = VREF, switch pin open, unless otherwise noted.
SYMBOL
VREF
IB
gm
AV
IQ
BV
VSAT
ILIM
PARAMETER
Reference Voltage Measured at
Feedback Pin (Note 4)
Reference Voltage
CONDITIONS
LT1268B
LT1268
Feedback Input Current
VFB = VREF
Error Amplifier Transconductance
∆IC = ±25µA
Error Amplifier Source or Sink Current VC = 1.5V
Error Amplifier Clamp Voltage
Reference Voltage Line Regulation
Error Amplifier Voltage Gain
Minimum Input Voltage
Supply Current
Control Pin Threshold
Hi Clamp, VFB = 1V
Lo Clamp, VFB = 1.5V
3V ≤ VIN ≤ VMAX, VC = 0.8V
0.9V ≤ VC ≤ 1.4V
3V ≤ VIN ≤ VMAX, VC = 0.6V
Duty Cycle = 0
Output Switch Breakdown Voltage
Output Switch-ON Resistance
(Note 1, 3)
Control Voltage to Switch
Current Transconductance
Switch Current Limit (Note 3, 6)
3V ≤ VIN ≤ VMAX, ISW = 1.5mA
TJ ≤ 100°C
TJ ≤ 125°C
Duty Cycle = 50%, TJ ≤ 100°C
Duty Cycle = 65%, TJ ≤ 100°C
MIN TYP MAX
1.235 1.244 1.253
q
1.224 1.244 1.264
1.224 1.244 1.264
q
1.214 1.244 1.274
350 750
q
1100
3000 4400 6000
q
2400
7000
150 200 350
q
120
400
1.80
2.30
0.25 0.38 0.52
q
0.03
500 800
q
2.8
3.0
7
10
0.7
0.9 1.08
q
0.5
1.25
q
60
75
0.12 0.18
0.22
12
q
7.50
15
q
6.50
14
UNITS
V
V
V
V
nA
nA
µmho
µmho
µA
µA
V
V
%/ V
V/ V
V
mA
V
V
V
Ω
Ω
A/V
A
A
2
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