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LTC1871IMS#PBF-1

更新时间： 2024-02-23 13:27:42
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
36页 354K
描述
IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10, LEAD FREE, PLASTIC, MSOP-10, Switching Regulator or Controller

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LTC1871IMS#PBF-1 技术参数

是否无铅： 不含铅生命周期：Active
零件包装代码：MSOP包装说明：LEAD FREE, PLASTIC, MSOP-10
针数：10Reach Compliance Code：unknown
风险等级：5.08Base Number Matches：1

LTC1871IMS#PBF-1 数据手册

 浏览型号LTC1871IMS#PBF-1的Datasheet PDF文件第2页浏览型号LTC1871IMS#PBF-1的Datasheet PDF文件第3页浏览型号LTC1871IMS#PBF-1的Datasheet PDF文件第4页浏览型号LTC1871IMS#PBF-1的Datasheet PDF文件第5页浏览型号LTC1871IMS#PBF-1的Datasheet PDF文件第6页浏览型号LTC1871IMS#PBF-1的Datasheet PDF文件第7页 
LTC1871-1  
TM  
SENSE  
Wide Input Range, No R  
Current Mode Boost,  
Flyback and SEPIC Controller  
U
FEATURES  
DESCRIPTIO  
The LTC®1871-1 is a wide input range, current mode,  
boost, flyback or SEPIC controller that drives an N-  
channel power MOSFET and requires very few external  
components. It eliminates the need for a current sense  
resistor by utilizing the power MOSFET’s on-resistance,  
thereby maximizing efficiency. Higher output voltage  
applicationsarepossiblewiththeLTC1871-1byconnect-  
ing the SENSE pin to a resistor in the source of the power  
MOSFET.  
■
High Efficiency (No Sense Resistor Required)  
■
Wide Input Voltage Range: 2.5V to 36V  
■
Current Mode Control Provides Excellent  
Transient Response  
■
High Maximum Duty Cycle (92% Typ)  
■
±2% RUN Pin Threshold with 100mV Hysteresis  
■
±1% Internal Voltage Reference  
■
Ultra Low Pulse Skip Threshold for Wide Input  
Range Applications  
■
Micropower Shutdown: IQ = 10μA  
The IC’s operating frequency can be set with an external  
resistorovera50kHzto1MHzrange, andcanbesynchro-  
nized to an external clock using the MODE/SYNC pin.  
■
Programmable Operating Frequency  
(50kHz to 1MHz) with One External Resistor  
■
Synchronizable to an External Clock Up to 1.3 × fOSC  
User-Controlled Pulse Skip or Burst Mode® Operation  
The LTC1871-1 differs from the LTC1871 by having a  
lower pulse skip threshold, making it ideal for applica-  
tions requiring constant frequency operation at light  
loads. The lower pulse skip threshold also helps maintain  
constant frequency operation in applications with a wide  
input voltage range. For applications requiring primary-  
to-secondary side isolation, please refer to the LTC1871  
datasheet.  
■
■
Internal 5.2V Low Dropout Voltage Regulator  
Output Overvoltage Protection  
Capable of Operating with a Sense Resistor for High  
Output Voltage Applications  
Small 10-Lead MSOP Package  
■
■
■
U
APPLICATIO S  
TheLTC1871-1isavailableinthe10-leadMSOPpackage.  
■
Telecom Power Supplies  
Portable Electronic Equipment  
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology  
■
Corporation. No R  
is a trademark of Linear Technology Corporation. All other  
SENSE  
trademarks are the property of their respective owners.  
U
TYPICAL APPLICATIO  
V
IN  
3.3V  
Efficiency of Figure 1  
L1  
1μH  
100  
90  
80  
70  
60  
50  
40  
30  
D1  
RUN  
SENSE  
V
OUT  
5V  
Burst Mode  
OPERATION  
I
TH  
V
IN  
7A  
C
R
OUT1  
C
+
(10A PEAK)  
LTC1871-1  
INTV  
150μF  
6.3V  
×4  
22k  
FB  
PULSE-SKIP  
MODE  
CC  
C
6.8nF  
C1  
R1  
12.1k  
1%  
C
OUT2  
FREQ  
GATE  
GND  
M1  
22μF  
6.3V  
X5R  
×2  
C
IN  
C
VCC  
+
R2  
37.4k  
1%  
R
T
80.6k  
1%  
MODE/SYNC  
22μF  
6.3V  
×2  
C
C2  
47pF  
4.7μF  
X5R  
GND  
1871 F01a  
C
C
C
:
TAIYO YUDEN JMK325BJ226MM  
: PANASONIC EEFUEOJ151R  
D1: MBRB2515L  
IN  
L1: SUMIDA CEP125-H 1R0MH  
M1: FAIRCHILD FDS7760A  
OUT1  
OUT2  
0.001  
0.01  
0.1  
1
10  
: TAIYO YUDEN JMK325BJ226MM  
OUTPUT CURRENT (A)  
1871 F01b  
Figure 1. High Efficiency 3.3V Input, 5V Output Boost Converter (Bootstrapped)  
18711fa  
1
1234567...36

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