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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

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中文翻译

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LTC3446 数据手册

 浏览型号LTC3446的Datasheet PDF文件第1页浏览型号LTC3446的Datasheet PDF文件第2页浏览型号LTC3446的Datasheet PDF文件第3页浏览型号LTC3446的Datasheet PDF文件第5页浏览型号LTC3446的Datasheet PDF文件第6页浏览型号LTC3446的Datasheet PDF文件第7页 
LTC3446  
elecTrical characTerisTics  
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 3: Minimum operating V voltage required for the VLDO regulators  
to stay in regulation is:  
IN  
V
IN  
≥ LV  
+ 1.4V and V ≥ 2.7V  
OUT(MAX) IN  
Note 4: Dynamic supply current is higher due to the internal gate charge  
being delivered at the switching frequency.  
Note 5: The LTC3446 is tested in a feedback loop that connects the  
Note 2: The LTC3446 is tested under pulsed load conditions such that  
T ≈ T . The LTC3446E is guaranteed to meet performance specifications  
J
A
from 0°C to 85°C operating junction temperature. Specifications over  
the –40°C to 125°C operating junction temperature range are assured by  
design characterization and correlation with statistical process controls.  
The LTC3446I is guaranteed to meet performance specifications over  
the –40°C to 125°C operating junction temperature range. Note that the  
maximum ambient temperature consistent with these specifications is  
determined by specific operating conditions in conjunction with board  
layout, the rated package thermal impedance and other environmental  
BUCKFB pin to the output of the buck converter’s error amplifier (i.e., the  
I
TH  
pin).  
Note 6: Minimum operating LV voltage required for the VLDO regulators  
IN  
to stay in regulation is:  
LV ≥ L  
+ 100mV and LV ≥ 0.9V  
IN  
IN  
VOUT(MAX)  
Note 7: Operating conditions are limited by maximum junction  
temperature. The regulated output voltage specification will not apply  
for all possible combinations of input voltage and output current. When  
operating at maximum input voltage, the output current range must be  
limited. When operating at maximum output current, the input voltage  
range must be limited.  
factors. The junction temperature (T , in °C) is calculated from the ambient  
J
temperature (T , in °C) and power dissipation (P , in Watts) according to  
A
D
the formula:  
T = T + (P • θ )  
JA  
J
A
D
Note 8: PGOOD assertion indicates that the feedback voltages of all  
enabled supplies are within the specified percentage of their target values.  
where θ (in °C/W) is the package thermal impedance.  
JA  
Note 9: Dropout voltage in the DFN package is assured by design,  
characterization and statistical process control.  
Typical perForMance characTerisTics  
LDO2 Regulated Feedback  
Voltage vs Temperature  
Buck Regulated Feedback Voltage  
vs Temperature  
LDO1 Regulated Feedback  
Voltage vs Temperature  
408  
406  
404  
402  
400  
398  
396  
394  
392  
808  
806  
804  
802  
800  
798  
796  
794  
792  
408  
406  
404  
402  
400  
398  
396  
394  
392  
V
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
= 5.5V  
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  
IN  
IN  
IN  
IN  
30 50  
TEMPERATURE (°C)  
–50 –30 –10 10  
70 90 110 130  
30 50  
TEMPERATURE (°C)  
–50 –30 –10 10  
70 90 110 130  
30 50  
TEMPERATURE (°C)  
–50 –30 –10 10  
70 90 110 130  
3446 G03  
3446 G01  
3446 G02  
3446ff  
4
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