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LTC2927ITS8-PBF

更新时间： 2024-09-24 05:43:51
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
16页 255K
描述
Single Power Supply Tracking Controller

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中文翻译

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LTC2927ITS8-PBF 数据手册

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LTC2927  
Single Power Supply  
Tracking Controller  
U
DESCRIPTIO  
FEATURES  
The LTC®2927 provides a simple solution to power supply  
tracking and sequencing requirements. By selecting a few  
resistors, the supply can be configured to ramp-up and  
ramp-down with differing ramp rates, voltage offsets, or  
time delays relative to other supplies or a master signal.  
n
Flexible Power Supply Tracking  
n
Tracks Both Up and Down  
n
Power Supply Sequencing  
n
Supply Stability is Not Affected  
n
Low Pin Count  
n
Controls Single Supply without Series FETs  
By forcing current into a feedback node of an independent  
supply, the LTC2927 causes the output to track a ramp  
signalwithoutinsertinganypasselementlosses. Because  
the current is controlled in an open-loop manner, the  
LTC2927 does not affect the transient response or stabil-  
ity of the supply. The compact solution at point of load  
minimizes the trace length of the DC/DC circuit sensitive  
FB node. Furthermore, it presents a high impedance when  
power-up is complete, effectively removing it from the  
DC/DC circuit.  
n
Adjustable Ramp Rate  
Supply Shutdown Output  
n
n
Available in 8-Lead ThinSOT™ and 8-Lead  
(3mm × 2mm) DFN Packages  
U
APPLICATIO S  
n
V
and V Supply Tracking  
CORE  
I/O  
n
n
n
Microprocessor, DSP and FPGA Supplies  
Multiple Supply Systems  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Patents Pending.  
Point-of-Load Supplies  
U
TYPICAL APPLICATIO  
EARLY V  
IN  
Track-Up and Track-Down Waveforms  
3.3V  
138k  
0.1μF  
0.1μF  
V
CC  
ON  
RAMP  
V
IN  
RAMP  
(3.3V)  
100k  
LTC2927  
2.5V  
1.8V  
SDO  
FB  
RUN/SS IN  
DC/DC  
FB = 1.235V  
1V/DIV  
RAMPBUF  
TRACK  
OUT  
1.8V  
16.5k  
13k  
16.5k  
GND  
35.7k  
2927 TA01b  
10ms/DIV  
EARLY V  
IN  
3.3V  
0.1μF  
V
CC  
RAMP  
(3.3V)  
ON  
RAMP  
SDO  
FB  
V
IN  
LTC2927  
2.5V  
1.8V  
1V/DIV  
RUN/SS IN  
DC/DC  
FB = 0.8V  
RAMPBUF  
OUT  
2.5V  
887k  
412k  
TRACK  
887k  
GND  
412k  
2927 TA01c  
10ms/DIV  
2927 TA01a  
2927fb  
1
1234567...16

中文翻译

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