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LT3695

更新时间： 2024-09-09 05:43:35
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
28页 299K
描述
1A Fault Tolerant Micropower Step-Down Regulator

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中文翻译

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LT3695 数据手册

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LT3695  
1A Fault Tolerant Micropower  
Step-Down Regulator  
FEATURES  
DESCRIPTION  
TheLT®3695isanadjustablefrequency(250kHzto2.2MHz)  
monolithicbuckswitchingregulatorthatacceptsinputvolt-  
ages up to 36V and can safely sustain transient voltages  
up to 60V. The device includes a high efficiency switch, a  
boostdiode,andthenecessaryoscillator,controlandlogic  
circuitry. Current mode topology is used for fast transient  
response and good loop stability. A SYNC pin allows the  
user to synchronize the part to an external clock, and to  
choose between low ripple Burst Mode operation and  
standard PWM operation.  
n
Wide Input Range:  
Operation from 3.6V to 36V  
Overvoltage Lockout Protects Circuits Through  
60V Transients  
n
FMEA Fault Tolerant:  
Output Stays at or Below Regulation Voltage  
During Adjacent Pin Short or When a Pin Is Left  
Floating  
n
1A Output Current  
Low Ripple (< 15mV ) Burst Mode® Operation  
n
P-P  
IN  
I = 75μA for 12V to 3.3V with No Load  
Q
OUT  
The LT3695 tolerates adjacent pin shorts or an open pin  
without raising the output voltage above its programmed  
value.  
n
n
n
n
n
n
Adjustable Switching Frequency: 250kHz to 2.2MHz  
Short-Circuit Protected  
Synchronizable Between 300kHz and 2.2MHz  
Output Voltage: 0.8V to 20V  
Low ripple Burst Mode operation maintains high effi-  
ciency at low output currents while keeping output ripple  
below 15mV in a typical application. Shutdown reduces  
input supply current to less than 1μA while a resistor and  
capacitor on the RUN/SS pin provide a controlled output  
voltage ramp (soft-start). Protection circuitry senses the  
current in the power switch and external Schottky catch  
diode to protect the LT3695 against short-circuit condi-  
tions. Frequency foldback and thermal shutdown provide  
additional protection.  
Power Good Flag  
Small Thermally Enhanced 16-Pin MSOP Package  
APPLICATIONS  
n
Automotive Battery Regulation  
n
Automotive Entertainment Systems  
n
Distributed Supply Regulation  
Industrial Supplies  
n
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of  
Linear Technology Corporation. All other trademarks are the property of their respective owners.  
The LT3695 is available in a thermally enhanced 16-Pin  
MSOP package.  
TYPICAL APPLICATION  
Efficiency  
100  
5V Step-Down Converter  
V
V
IN  
V
= 5V  
OUT  
OUT  
6.9V TO 36V  
5V  
90  
80  
TRANSIENT TO 60V  
0.9A, V > 6.9V  
1A, V > 12V  
IN  
IN  
V
BD  
BOOST  
IN  
RUN/SS  
V
OUT  
= 3.3V  
2.2μF  
ON OFF  
0.22μF  
10μH  
V
C
SW  
LT3695  
RT  
70  
PG  
DA  
FB  
536k  
16.2k  
40.2k  
SYNC  
60  
50  
V
= 12V  
IN  
GND PGND  
470pF 100k  
102k  
10μF  
L = 10µH  
f = 800kHz  
3695 TA01a  
f = 800kHz  
0
0.2  
0.4  
0.6  
0.8  
1
LOAD CURRENT (A)  
3695 TA01b  
3695f  
1
1234567...28

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