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LTC3606BEDD

更新时间： 2022-12-19 06:58:26
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
20页 314K
描述
800mA Synchronous Step-Down DC/DC with Average Input Current Limit

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LTC3606BEDD 数据手册

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LTC3606B  
800mA Synchronous  
Step-Down DC/DC with  
Average Input Current Limit  
FEATURES  
DESCRIPTION  
The LTC®3606B is an 800mA monolithic synchronous  
buck regulator using a constant frequency current mode  
architecture.  
n
Programmable Average Input Current Limit:  
±±5 Accuracꢀ  
n
Step-Down Output: 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  
cyclecapabilityprovideslowdropoutoperation,extending  
the run time in battery-operated systems. Low output  
voltages are supported with the 0.6V feedback reference  
voltage. The LTC3606B can supply 800mA output current.  
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  
n
Low Dropout Operation: 1005 Dutꢀ Cꢀcle  
n
Internal Soft-Start  
n
The LTC3606B’s programmable average input current  
limit is ideal for USB applications and for point-of-load  
power supplies because the LTC3606B’s limited input  
current will still allow its output to deliver high peak load  
currentswithoutcollapsingtheinputsupply.Theoperating  
frequency is internally set at 2.25MHz allowing the use of  
smallsurfacemountinductors. Internalsoft-startreduces  
in-rushcurrentduringstart-up. TheLTC3606Bisavailable  
in an 8-Lead 3mm × 3mm DFN package.  
Current Mode Operation for Excellent Line and Load  
Transient Response  
2% Output Voltage Accuracy  
n
n
Short-Circuit Protected  
Shutdown Current ≤ 1μA  
Available in Small Thermally Enhanced 8-Lead  
3mm × 3mm DFN Package  
n
n
APPLICATIONS  
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.  
n
High Peak Load Current Applications  
n
USB Powered Devices  
n
Supercapacitor Charging  
Radio Transmitters and Other Handheld Devices  
n
TYPICAL APPLICATION  
Monolithic Buck Regulator with Input Current Limit  
1.5ꢀH  
GSM Pulse Load  
V
OUT  
V
3.4V  
V
OUT  
IN  
V
SW  
3.4V AT  
800mA  
IN  
TO 5.5V  
200mV/DIV  
LTC3606B  
499k  
RUN  
C
V
IN  
IN  
+
2.2mF  
10ꢀF  
AC-COUPLED  
1V/DIV  
PGOOD  
RLIM  
s2  
1210k  
SuperCap  
V
FB  
PGOOD  
I
OUT  
GND  
255k  
500mA/DIV  
116k  
1000pF  
3606B TA01  
I
IN  
500mA/DIV  
I
= 475mA  
3606B TA01b  
LIM  
1ms/DIV  
V
LOAD  
= 5V, 500mA COMPLIANT  
IN  
I
= 0A to 2.2A  
3606bfa  
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