参数资料
| 型号： | LTC3444EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CONV WCDMA 8-DFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，WCDMA 功率放大器应用 |
| 输入电压： | 2.75 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 带卷 (TR) |
LTC3444
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T A = 25 ° C.
V IN = V OUT = 3.6V unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SHDN Threshold (On)
SHDN Threshold (Off)
IC is Enabled
IC is Disabled
●
●
1.4
0.4
V
V
SHDN Input Current
V C Output Current
V SHDN = 3.6V
V C = GND
0.01
0.5
1
2
μ A
μ A
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3444E is guaranteed to meet performance specifications
from 0 ° C to 85 ° C. Specifications over the –40 ° C to 85 ° C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current measurements are performed when the outputs are not
switching.
Note 4: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125 ° C when overtemperature is active.
Continuous operation above the specified maximum operating junction
temperature may result in device degradation or failure.
TYPICAL PERFOR A CE CHARACTERISTICS
(T A = 25 ° C unless otherwise specified)
Efficiency vs V IN
Li-Ion to 1V Efficiency
Li-Ion to 3.3V Efficiency
85
V OUT = 1.0V
90
80
0.18
0.16
100
90
0.25
80
75
70
I OUT = 50mA
I OUT = 100mA
I OUT = 65mA
70
60
50
40
30
V IN = 3.6V
V IN = 3.1V
V IN = 4.4V
0.14
0.12
0.10
0.08
0.06
80
70
60
50
40
30
V IN = 3.1V
V IN = 4.4V
V IN = 3.6V
0.20
0.15
0.10
65
60
3.1
3.3
3.5
3.7
3.9
4.1
4.3
4.5
20
10
0
1
V IN = 4.4V
V IN = 3.1V
10 100
PLOSS
0.04
0.02
0
1000
20
10
0
1
V IN = 3.6V
V IN = 3.1V
10 100
PLOSS
0.05
0
1000
V IN (V)
Li-Ion to 4.2V Efficiency
3444 G03
OUTPUT CURRENT (mA)
3444 G06
Error Amp Source Current
OUTPUT CURRENT (mA)
Operating Frequency
3444 G05
100
90
80
70
V IN = 3.1V
V IN = 3.6V
0.50
0.45
0.40
0.35
19
17
15
1.8
1.7
1.6
60
0.30
13
50
40
V IN = 4.4V
0.25
0.20
11
1.5
30
0.15
9
1.4
20
10
0
1
V IN = 4.4V
V IN = 3.1V
10 100
OUTPUT CURRENT (mA)
PLOSS 0.10
0.05
0
1000
7
V C = 1V
FB = 0V
5
–55 –25
5 35 65
TEMPERATURE ( ° C)
95
125
1.3
1.2
–55
–25
0 35 65
TEMPERATURE ( ° C)
95
125
3444 G04
3444 G07
3444 G08
3444fb
3
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