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參數(shù)資料
| 型號： | LT1082IQ#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.8 A SWITCHING REGULATOR, 75 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封裝： | PLASTIC, D2PAK-5 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 179K |
| 代理商： | LT1082IQ#TR |
3
LT1082
sn1082 1082fas
ELECTRICAL C
C
HARA TERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IQ
Supply Current
3V
≤ VIN ≤ VMAX, VC = 0.6V
4.5
7.0
mA
Control Pin Threshold
Duty Cycle = 0
0.7
0.9
1.1
V
q
0.5
1.25
V
Normal/Flyback Threshold
0.58
0.67
0.8
V
on Feedback Pin
f
Switching Frequency
50
60
70
kHz
q
45
75
kHz
800
A ≥ IFB ≥ 450A
12
kHz
BV
Output Switch Breakdown Voltage
3V
≤ VIN ≤ VMAX, ISW = 1.5mA
q
100
115
V
Control Voltage to Switch
1.5
A/V
Current Transconductance
VFB
Flyback Reference Voltage
IFB = 60A
17
18.6
20.5
V
q
16
21.5
V
Change in Flyback Reference Voltage
60
A ≤ IFB ≤ 200A
3.5
4.6
6.5
V
Flyback Reference Voltage Line Regulation
IFB = 60A, 3V ≤ VIN ≤ VMAX
0.01
0.03
%/V
Flyback Amplifier Transconductance (gm)
IC = ±10A
150
300
500
mho
Flyback Amplifier Source
VC = 0.6V Source
q
15
32
70
A
and Sink Current
IFB = 60A Sink
q
30
50
90
A
VSAT
Output Switch “On” Resistance (Note 2)
ISW = 0.7A (LT1082C), ISW = 0.5A (LT1082M)
q
0.8
1.2
ILIM
Switch Current Limit
Duty Cycle = 20%
q
1.07
2.6
A
(LT1082C)
Duty Cycle
≤ 50%
q
1.0
2.6
A
Duty Cycle = 80% (Note 3)
q
0.8
2.4
A
Switch Current Limit
Duty Cycle = 20%
q
0.85
2.8
A
(LT1082I)
Duty Cycle
≤ 50%
q
0.8
2.8
A
Duty Cycle = 80% (Note 3)
q
0.65
2.6
A
Switch Current Limit
Duty Cycle = 20%
q
0.75
3.0
A
(LT1082M)
Duty Cycle
≤ 50%
q
0.7
3.0
A
Duty Cycle = 80% (Note 3)
q
0.6
2.8
A
IIN
Supply Current Increase
35
45
mA/A
ISW
During Switch-On Time
DCMAX
Maximum Switch Duty Cycle
85
92
97
%
Flyback Sense Delay Time
1.5
s
Shutdown Mode Supply Current
3V
≤ VIN ≤ VMAX, VC = 0.05V
120
350
A
Shutdown Mode
3V
≤ VIN ≤ VMAX
70
150
250
mV
Threshold Voltage
q
50
300
mV
Note 1: Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2: Measured with VC in hi clamp, VFB = 0.8V.
Note 3: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current decreases linearly.
The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VC = 0.5V, VFB = VREF, output pin open, unless otherwise
specified.
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