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参数资料
| 型号： | LT1108CS8-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST INV 5V .4A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压），反相 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2 V ~ 30 V |
| 频率 - 开关： | 19kHz |
| 电流 - 输出： | 400mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1108
ELECTRICAL C HARA C TERISTICS
T A = 25 ° C, V IN = 3V, unless otherwise noted.
SYMBOL
V SAT
PARAMETER
SW SAT Voltage, Step-Down Mode
CONDITIONS
V IN = 12V, I SW = 650mA
MIN
TYP
1.1
MAX
1.5
UNITS
V
q
1.7
V
A V
Gain Block Gain
R L = 100k (Note 3)
q
400
1000
V/ V
Current Limit
Current Limit Temperature Coefficient
220 ? from I LIM to V IN
q
400
– 0.3
mA
%/ ° C
Switch OFF Leakage Current
Measured at SW1 Pin
1
10
μ A
V SW2
Maximum Excursion Below GND
I SW1 ≤ 10 μ A, Switch OFF
– 400
– 350
mV
The q denotes specifications which apply over the full operating
temperature range.
Note 1: This specification guarantees that both the high and low trip points
of the comparator fall within the 1.2V to 1.3V range.
Note 2: The output voltage waveform will exhibit a sawtooth shape due to
the comparator hysteresis. The output voltage on the fixed output versions
will always be within the specified range.
Note 3: 100k resistor connected between a 5V source and the A0 pin.
TYPICAL PERFOR A CE C HARA C TERISTICS
Switch ON Voltage
Saturation Voltage Step-Up Mode
(SW2 Pin Grounded)
Step-Down Mode
(SW1 Pin Connected to V IN )
Maximum Switch Current
vs R LIM
1.2
1.0
1.4
1.3
1200
1100
1000
2V ≤ V IN ≤ 5V
0.8
0.6
0.4
0.2
V IN = 3V
V IN = 2V
V IN = 5V
1.2
1.1
1.0
0.9
0.8
900
800
700
600
500
400
300
200
0
0
0.2
0.4 0.6 0.8
SWITCH CURRENT (A)
1.0
1.2
0.7
0
0.1 0.2 0.3 0.4 0.5 0.6
SWITCH CURRENT (A)
0.7 0.8
100
10
100
R LIM ( ? )
1000
LT1108 ? TPC01
Saturation Voltage Step-Up Mode
(SW2 Pin Grounded)
LT1108 ? TPC02
Supply Current vs Switch Current
Quiescent Current
LT1108 ? TPC03
1000
900
800
V OUT = 5V
50
40
120
115
700
600
V IN = 24V
L = 500 μ H
30
110
105
500
400
V IN = 12V
L = 250 μ H
20
V IN = 5V
100
95
300
200
100
10
V IN = 2V
90
85
0
100
R LIM ( ? )
1000
0
0
200
400 600 800
SWITCH CURRENT (mA)
1000
80
–50
–25
0 25 50
TEMPERATURE (°C)
75
100
LT1108 ? TPC04
LTC1108 ? TPC05
LT1108 ? TPC06
3
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