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LT3695IMSE#TRPBF

更新时间： 2024-09-15 04:33:15
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亚德诺 - ADI /
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30页 496K
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LT3695IMSE#TRPBF

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LT3695IMSE#TRPBF 数据手册

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LT3695 Series  
1A Fault Tolerant Micropower  
Step-Down Regulator  
FEATURES  
DESCRIPTION  
The LT®3695 series are adjustable frequency (250kHz to  
2.2MHz)monolithicbuckswitchingregulatorsthataccept  
input voltages up to 36V and can safely sustain transient  
voltages up to 60V. The devices include a high efficiency  
switch, aboostdiode, andthenecessaryoscillator, control  
and logic circuitry. Current mode topology is used for fast  
transient response and good loop stability. A SYNC pin  
allowstheusertosynchronizetheparttoanexternalclock,  
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 regulators tolerate adjacent pin shorts or  
an open pin without raising the output voltage above its  
programmed value.  
n
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  
diodetoprotecttheLT3695regulatorsagainstshort-circuit  
conditions. Frequency foldback and thermal shutdown  
provide additional protection.  
Power Good Flag  
Fixed Output Voltage Versions for 3.3V and 5V Available  
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 series is available in a thermally enhanced  
16-pin MSOP package.  
TYPICAL APPLICATION  
Efficiency  
100  
5V Step-Down Converter  
V
V
IN  
V
= 5V  
OUT  
5V  
OUT  
6.9V TO 36V  
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  
40.2k  
0.22μF  
10μH  
V
C
SW  
LT3695  
RT  
70  
PG  
DA  
FB  
536k  
16.2k  
470pF  
SYNC  
GND PGND  
60  
50  
V
= 12V  
IN  
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  
3695fa  
1
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