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LTC1871EMS

更新时间： 2024-01-11 08:06:16
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
36页 411K
描述
Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller

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LTC1871EMS 数据手册

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LTC1871  
TM  
SENSE  
Wide Input Range, No R  
Current Mode Boost, Flyback and SEPIC Controller  
U
FEATURES  
DESCRIPTIO  
■
High Efficiency (No Sense Resistor Required)  
Wide Input Voltage Range: 2.5V to 36V  
Current Mode Control Provides Excellent  
Transient Response  
TheLTC®1871isawideinputrange, currentmode, boost,  
flyback and SEPIC controller that drives an N-channel  
power MOSFET and requires very few external compo-  
nents. Intended for low to medium power applications, it  
eliminates the need for a current sense resistor by utiliz-  
ingthepowerMOSFET’son-resistance,therebymaximiz-  
ing efficiency.  
■
■
■
■
■
■
■
High Maximum Duty Cycle (92% Typ)  
±2% RUN Pin Threshold with 100mV Hysteresis  
±1% Internal Voltage Reference  
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.  
Burst Mode operation at light loads, a low minimum  
operating supply voltage of 2.5V and a low shutdown  
quiescent current of 10µA make the LTC1871 ideally  
suited for battery-operated systems.  
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  
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  
■
■
■
■
■
For applications requiring constant frequency operation,  
Burst Mode operation can be defeated using the MODE/  
SYNC pin. Higher output voltage boost, SEPIC and fly-  
back applications are possible with the LTC1871 by  
connectingtheSENSEpintoaresistorinthesourceofthe  
power MOSFET.  
■
U
APPLICATIO S  
■
Telecom Power Supplies  
Portable Electronic Equipment  
■
The LTC1871 is available in the 10-lead MSOP package.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
No RSENSE is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
V
IN  
3.3V  
Efficiency of Figure 1  
L1  
1µH  
100  
90  
80  
70  
60  
50  
40  
30  
D1  
RUN  
SENSE  
Burst Mode  
OPERATION  
V
OUT  
5V  
I
TH  
V
IN  
7A  
C
R
OUT1  
C
+
(10A PEAK)  
LTC1871  
INTV  
150µF  
6.3V  
×4  
22k  
PULSE-SKIP  
MODE  
FB  
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  
L1: SUMIDA CEP125-H 1R0MH  
M1: FAIRCHILD FDS7760A  
IN  
0.001  
0.01  
0.1  
1
10  
OUT1  
OUT2  
OUTPUT CURRENT (A)  
: TAIYO YUDEN JMK325BJ226MM  
1871 F01b  
Figure 1. High Efficiency 3.3V Input, 5V Output Boost Converter (Bootstrapped)  
1
1234567...36

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