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LTC3446 PDF预览

LTC3446

更新时间: 2023-12-20 18:44:00
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
20页 283K
描述
具双 VLDO 稳压器的单片式降压型稳压器

LTC3446 数据手册

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LTC3446  
Typical perForMance characTerisTics  
Undervoltage Lockout Threshold  
vs Temperature  
Oscillator Frequency  
vs Temperature  
Maximum Peak Inductor Current  
2.50  
2.45  
2.40  
2.35  
2.30  
2.25  
2.20  
2.15  
2.10  
2.05  
2.00  
2.5  
2.4  
2.3  
2.2  
2.1  
2.0  
1.9  
1.8  
1.7  
1.6  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
2.50  
2.45  
2.40  
2.35  
2.30  
2.25  
2.20  
2.15  
2.10  
2.05  
2.00  
UVLO RISING  
UVLO FALLING  
V
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
= 5.5V  
V
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
= 5.5V  
IN  
IN  
IN  
IN  
IN  
IN  
IN  
IN  
30  
TEMPERATURE (°C)  
90  
110 130  
–50 –30 –10 10  
50 70 90 110 130  
–50 –30 –10 10  
50  
30  
70  
–50 –30 –10 10 30 50 70 90 110 130  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
3446 G05  
3446 G06  
3446 G04  
Peak Inductor Current  
vs ITH Voltage  
VLDO Current Limit  
vs LVIN Voltage  
VLDO Dropout Voltage  
vs Load Current  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
1800  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
V = 2.8V  
IN  
V
V
= 3.6V  
IN  
MODESEL  
V
= 3.6V  
= 0V  
IN  
OUT  
LV  
= 1.2V  
–45°C  
27°C  
90°C  
130°C  
= 3.6V  
1600 LV  
1400  
1200  
1000  
800  
OUT  
PULSED MEASUREMENT,  
T ≈ T ≈ 27°C  
J
A
600  
400  
200  
0
1
1.25  
1.5 1.75  
0
0.25 0.5 0.75  
2
0
50  
150  
200  
250  
300  
100  
0.00 1.00 2.00 3.00 4.00 5.00  
6.00  
I
PIN VOLTAGE (V)  
LOAD CURRENT (mA)  
LV PIN VOLTAGE (V)  
IN  
TH  
3446 G07  
3446 G09  
3446 G08  
VIN Bias Current  
vs VLDO Load Current  
LVIN No-Load Operating Current  
Enable/MODESEL Thresholds  
450  
20  
18  
16  
14  
12  
10  
8
1000  
900  
800  
700  
600  
500  
400  
300  
200  
100  
0
V
= 5V  
IN  
400  
350  
300  
250  
200  
150  
100  
50  
BOTH VLDOS ON AND  
REGULATING 0.8V  
V
= 3.6V  
IN  
LV = 1.5V  
IN  
OUT  
LV  
= 1.2V  
ONLY ONE VLDO  
ENABLED  
–45°C  
6
–45°C  
–45°C  
4
27°C  
90°C  
130°C  
27°C  
90°C  
130°C  
27°C  
90°C  
2
130°C  
0
0
0
1
3
4
5
6
2
2.5  
3
4
4.5  
5
5.5  
3.5  
0
50  
100  
150  
300  
200  
250  
LV PIN VOLTAGE (V)  
IN  
V
(V)  
VLDO OUTPUT CURRENT (mA)  
IN  
3446 G11  
3446 G12  
3446 G10  
3446ff  
5

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