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LTC3619 PDF预览

LTC3619

更新时间： 2023-12-20 18:44:41
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
22页 499K
描述
具平均输入电流限制的 400mA / 800mA 同步降压型 DC/DC 稳压器

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中文翻译

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LTC3619 数据手册

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LTC3619  
400mA/800mA Synchronous  
Step-Down DC/DC with  
Average Input Current Limit  
DescripTion  
FeaTures  
The LTC®3619 is a dual monolithic synchronous buck  
regulator using a constant frequency, current mode  
architecture.  
n
Programmable Average Input Current Limit:  
±±5 Accuracꢀ  
n
Dual Step-Down Outputs: Up to 965 Efficiencꢀ  
Low Ripple (<2±mV ) Burst Mode® Operation:  
I = ±0µA  
Q
n
P-P  
The input supply voltage range is 2.5V to 5.5V, making it  
ideal for Li-Ion and USB powered applications. 100% duty  
cycle capability provides low dropout operation, extend-  
ing the run time in battery-operated systems. Low output  
voltages are supported with the 0.6V feedback reference  
voltage. Channel 1 and channel 2 can supply 400mA and  
800mA output current, respectively.  
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n
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Input Voltage Range: 2.±V to ±.±V  
Output Voltage Range: 0.6V to ±V  
2.2±MHz Constant-Frequencꢀ Operation  
Power Good Output Voltage Monitor for Each Channel  
Low Dropout Operation: 1005 Dutꢀ Cꢀcle  
Independent Internal Soft-Start for Each Channel  
Current Mode Operation for Excellent Line and Load  
Transient Response  
The LTC3619’s programmable average input current limit  
is ideal for USB applications and for point-of-load power  
supplies because the LTC3619’s limited input current will  
still allow its output to deliver high peak load currents  
withoutcollapsingtheinputsupply. Whenthesumofboth  
channels’currentsexceedstheinputcurrentlimit,channel2  
is current limited while channel 1 remains regulated. The  
operating frequency is internally set at 2.25MHz allowing  
theuseofsmallsurfacemountinductors.Internalsoft-start  
reduces in-rush current during start-up. The LTC3619 is  
available in small MSOP and 3mm × 3mm DFN packages  
and is also available in a low noise, high efficiency pulse-  
skipping version, LTC3619B.  
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2% Output Voltage Accuracy  
Short-Circuit Protected  
Shutdown Current ≤ 1μA  
Available in Small Thermally Enhanced 10-Lead MSE  
and 3mm × 3mm DFN Packages  
applicaTions  
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High Peak Load Current Applications  
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USB Powered Devices  
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Supercapacitor Charging  
Radio Transmitters and Other Handheld Devices  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S.Patents, including 5481178, 6127815,  
6304066, 6498466, 6580258, 6611131.  
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Typical applicaTion  
Dual Monolithic Buck Regulator in 10-Lead 3mm × 3mm DFN  
GSM Pulse Load  
V
IN  
V
3.4V TO 5.5V  
OUT2  
200mV/DIV  
10µF  
RUN2  
V
RUN1  
IN  
V
IN  
PGOOD2 PGOOD1  
1V/DIV  
AC-COUPLED  
LTC3619  
1.5µH  
3.3µH  
22pF  
V
V
OUT1  
1.8V AT  
400mA  
OUT2  
SW2  
SW1  
3.4V AT  
800mA  
I
OUT  
500mA/DIV  
1190k  
V
V
FB1  
FB2  
+
I
IN  
511k  
2.2mF  
×2  
SuperCap  
RLIM GND  
255k  
10µF  
255k  
500mA/DIV  
3619 TA01b  
3619 TA01a  
1ms/DIV  
1000pF  
116k  
V
LOAD  
= 5V, 500mA COMPLIANT,  
= 0A TO 2.2A, CHANNEL 1 UNLOADED  
IN  
I
I
= 475mA  
LIM  
3619fa  
1
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中文翻译

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与LTC3619相关器件

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 		400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit
LTC3619B ADI

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 		具平均输入电流限制的 400mA / 800mA 同步降压型 DC/DC 稳压器
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LTC3619BEMSE-TRPBF Linear

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 		400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit
LTC3619BIDD-PBF Linear

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 		400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit
LTC3619BIDD-TRPBF Linear

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 		400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit
LTC3619BIMSE-PBF Linear

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 		400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit
LTC3619BIMSE-TRPBF Linear

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 		400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit

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