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LTC3619BEMSE-PBF PDF预览

LTC3619BEMSE-PBF

更新时间： 2024-09-24 11:49:27
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
20页 486K
描述
400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit

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LTC3619BEMSE-PBF 数据手册

 浏览型号LTC3619BEMSE-PBF的Datasheet PDF文件第2页浏览型号LTC3619BEMSE-PBF的Datasheet PDF文件第3页浏览型号LTC3619BEMSE-PBF的Datasheet PDF文件第4页浏览型号LTC3619BEMSE-PBF的Datasheet PDF文件第5页浏览型号LTC3619BEMSE-PBF的Datasheet PDF文件第6页浏览型号LTC3619BEMSE-PBF的Datasheet PDF文件第7页 
LTC3619B  
400mA/800mA Synchronous  
Step-Down DC/DC with  
Average Input Current Limit  
FeaTures  
DescripTion  
The LTC®3619B is a dual monolithic synchronous buck  
regulator using a constant frequency current mode ar-  
chitecture.  
n
Programmable Average Input Current Limit:  
±±5 Accuracꢀ  
n
Dual Step-Down Outputs: Up to 965 Efficiencꢀ  
n
Low Noise Pulse-Skipping Operation at Light Loads  
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.  
n
Input Voltage Range: 2.±V to ±.±V  
n
Output Voltage Range: 0.6V to ±V  
n
2.2±MHz Constant-Frequencꢀ Operation  
n
Power Good Output Voltage Monitor for Each Channel  
n
Low Dropout Operation: 1005 Dutꢀ Cꢀcle  
n
Independent Internal Soft-Start for Each Channel  
n
Current Mode Operation for Excellent Line and Load  
TheLTC3619B’sprogrammableaverageinputcurrentlimit  
is ideal for USB applications and for point-of-load power  
supplies because the LTC3619B’s limited input current  
will still allow its output to deliver high peak load currents  
without collapsing the input supply. When the sum of  
both channels’ currents exceeds the input current limit,  
channel 2 is current limited while channel 1 remains regu-  
lated. The operating frequency is internally set at 2.25MHz  
allowingtheuseofsmallsurfacemountinductors.Internal  
soft-start reduces in-rush current during start-up. The  
LTC3619B is available in small MSOP and 3mm × 3mm  
DFN packages. The LTC3619B is also available in a low  
quiescent current, high efficiency Burst Mode® version,  
LTC3619.  
Transient Response  
2% Output Voltage Accuracy  
n
n
Short-Circuit Protected  
Shutdown Current ≤ 1μA  
Available in Small Thermally Enhanced 10-Lead MS  
and 3mm × 3mm DFN Packages  
n
n
applicaTions  
n
High Peak Load Current Applications  
n
USB Powered Devices  
n
Supercapacitor Charging  
Radio Transmitters and Other Handheld Devices  
n
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.  
Typical applicaTion  
GSM Pulse Load  
Dual Monolithic Buck Regulator in 10-Lead 3mm × 3mm DFN  
V
IN  
3.4V TO 5.5V  
V
OUT  
10µF  
200mV/DIV  
RUN2  
V
RUN1  
IN  
V
PGOOD2 PGOOD1  
IN  
AC-COUPLED  
1V/DIV  
LTC3619B  
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
FB2  
V
FB1  
+
I
IN  
511k  
2.2mF  
s2  
SuperCap  
RLIM GND  
255k  
10µF  
255k  
500mA/DIV  
3619B TA01b  
1ms/DIV  
3619B TA01  
V
I
= 5V, 500mA COMPLIANT  
LOAD  
IN  
= 0A to 2.2A, CHANNEL 1 UNLOADED  
116k  
1000pF  
I
= 475mA  
LIM  
3619bfa  
ꢀ
1234567...20

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