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LT8697EUDD

更新时间： 2022-03-20 15:38:14
品牌 Logo 应用领域
LINEAR_DIMENSIONS /
页数 文件大小 规格书
28页 481K
描述
USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation

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LT8697EUDD 数据手册

 浏览型号LT8697EUDD的Datasheet PDF文件第2页浏览型号LT8697EUDD的Datasheet PDF文件第3页浏览型号LT8697EUDD的Datasheet PDF文件第4页浏览型号LT8697EUDD的Datasheet PDF文件第5页浏览型号LT8697EUDD的Datasheet PDF文件第6页浏览型号LT8697EUDD的Datasheet PDF文件第7页 
Electrical Specifications Subject to Change  
LT8697  
USB 5V 2.5A Output,  
42V Input Synchronous Buck with  
Cable Drop Compensation  
FeaTures  
DescripTion  
The LT®8697 is a compact, high efficiency, high speed  
n
Wide Input Range: 5V to 42V  
n
Low Dropout Under All Conditions: 450mV at 2.1A  
Accurate 5V Output: 1.ꢀ3 Over ꢁull ꢂemperature  
Range  
Programmable Cable Drop Compensation  
Programmable Output Current Limit  
Output Current Monitor  
Dual Input ꢁeedback Permits Regulation on Output  
of USB Switch  
ꢁorced Continuous Mode for ꢁast Load Step  
Response  
High Efficiency Synchronous Operation at 2MHz:  
synchronous monolithic step-down switching regulator  
designed to power 5V USB applications. A precise output  
voltage and programmable cable drop compensation  
maintain accurate 5V regulation at the USB socket at the  
end of a long cable. Forced continuous operation allows  
the LT8697 to sink current, further enhancing accurate  
5V regulation during load transients.  
n
n
n
n
n
Accurate and programmable output current limit, a power  
good indicator pin and an output current monitor pin  
improve system reliability and safety, allow the user to  
implement latch-off or auto-retry functionality and can  
eliminate the need for a USB switch IC. Dual feedback al-  
lows regulation on the output of a USB switch and limits  
cable drop compensation to a maximum of 5.8V output,  
protecting USB devices during fault conditions. Thermal  
shutdownprovidesadditionalprotectionbylimitingpower  
dissipation in the IC during an overtemperature fault.  
The LT8697 is available in a small 24-lead 3mm × 5mm  
package with an exposed pad for low thermal resistance.  
n
n
93% Efficiency at 2.1A, 5V  
95% Efficiency at 0.9A, 5V  
Fast Minimum Switch-On Time: 70ns  
Adjustable Output from 5.0V to 5.25V  
Adjustable and Synchronizable: 300kHz to 2.2MHz  
Small Thermally Enhanced 3mm × 5mm 24-Lead  
QFN Package  
from 12V  
from 12V  
OUT  
OUT  
IN  
IN  
n
n
n
n
applicaTions  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective owners.  
n
Automotive and Industrial USB  
Precision 5V Supply  
n
Typical applicaTion  
2MHz 5V Step-Down Converter with Cable Drop Compensation  
ꢂransient Response ꢂhrough ꢀ Meters  
AWG 20 ꢂwisted-Pair Cable  
V
IN  
5.50  
5.25  
5.00  
4.75  
4.50  
4.25  
5
4
3
2
1
0
6V TO 42V  
0.1µF  
3.3µH  
3 METERS AWG 20  
TWISTED PAIR CABLE  
V
OUT  
4.7µF  
V
IN  
BST  
0.018Ω  
0.1Ω  
V
OUT  
EN/UV  
SW  
PG  
SYS  
LT8697  
47µF  
×2  
1nF  
V
LOAD  
INTV  
CC  
10k  
+
1µF  
ICTRL  
SYNC  
TR/SS  
RT  
ISP  
ISN  
V
LOAD  
5V, 2.4A  
I
LOAD  
50mA/µs  
USB5V  
RCBL  
–
10nF  
GND  
PGND  
18.2k  
16.5k  
0.1Ω  
100µs/DIV  
8697 TA01b  
8697 TA01a  
8697p  
1
For more information www.linear.com/LT8697  
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