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LTC3112

更新时间： 2024-11-13 11:45:59
品牌 Logo 应用领域
Linear Systems 转换器
页数 文件大小 规格书
40页 618K
描述
40V, 2A Synchronous Buck-Boost DC/DC Converter

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中文翻译

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LTC3112 数据手册

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LTC3115-1  
40V, 2A Synchronous  
Buck-Boost DC/DC  
Converter  
FEATURES  
DESCRIPTION  
TheLTC®3115-1isahighvoltagemonolithicsynchronous  
buck-boostDC/DCconverter.Itswide2.7Vto40Vinputand  
output voltage ranges make it well suited to a wide variety  
of automotive and industrial applications. A proprietary  
low noise switching algorithm optimizes efficiency with  
input voltages that are above, below or even equal to the  
output voltage and ensures seamless transitions between  
operational modes.  
n
Wide V Range: 2.7V to 40V  
IN  
n
Wide V  
Range: 2.7V to 40V  
OUT  
n
n
1A Output Current for V ≥ 3.6V, V  
= 5V  
IN  
OUT  
2A Output Current in Step-Down Operation  
for V ≥ 6V  
IN  
n
n
n
n
Programmable Frequency: 100kHz to 2MHz  
Synchronizable Up to 2MHz with an External Clock  
Up to 95% Efficiency  
30µA No-Load Quiescent Current in Burst Mode®  
Operation  
Programmable frequency PWM mode operation provides  
low noise, high efficiency operation and the ability to syn-  
chronizeswitchingtoanexternalclock.Switchingfrequen-  
ciesupto2MHzaresupportedtoallowuseofsmallvalued  
inductors for miniaturization of the application circuit. Pin  
selectable Burst Mode operation reduces standby current  
and improves light load efficiency which combined with a  
3µAshutdowncurrentmaketheLTC3115-1ideallysuitedfor  
battery-powered applications. Additional features include  
output disconnect in shutdown, short-circuit protection  
and internal soft-start. The LTC3115-1 is available in ther-  
mally enhanced 16-lead 4mm × 5mm × 0.75mm DFN and  
20-lead TSSOP packages.  
n
n
n
n
n
n
Ultralow Noise Buck-Boost PWM  
Internal Soft-Start  
3µA Supply Current in Shutdown  
Programmable Input Undervoltage Lockout  
Small 4mm × 5mm × 0.75mm DFN Package  
Thermally Enhanced 20-Lead TSSOP Package  
APPLICATIONS  
n
24V/28V Industrial Applications  
n
Automotive Power Systems  
n
Telecom, Servers and Networking Equipment  
FireWire Regulator  
Multiple Power Source Supplies  
L, LT, LTC, LTM, Burst Mode, LTspice, Linear Technology and the Linear logo are registered  
n
trademarks and No R  
is a trademark of Linear Technology Corporation. All other  
SENSE  
trademarks are the property of their respective owners. Protected by U.S. Patents including  
6404251, 6166527 and others pending.  
n
TYPICAL APPLICATION  
Efficiency vs VIN  
10µH  
95  
I
= 0.5A  
LOAD  
0.1µF  
0.1µF  
90  
85  
80  
75  
70  
BST1 SW1  
PV  
SW2 BST2  
PV  
5V  
I
= 1A  
LOAD  
2.7V TO  
40V  
1A V > 3.6V  
OUT  
IN  
IN  
2A V ≥ 6V  
IN  
4.7µF  
47µF  
V
IN  
33pF  
15k  
1M  
LTC3115-1  
3300pF  
60.4k  
BURST PWM  
OFF ON  
PWM/SYNC  
RUN  
VC  
FB  
PV  
V
249k  
CC  
CC  
RT  
GND  
PGND  
47.5k  
4.7µF  
(OPTIONAL)  
40  
31151 TA01b  
3115 TA01a  
2
10  
INPUT VOLTAGE (V)  
31151f  
1
1234567...40

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