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LTC1871HMS

更新时间： 2024-01-29 14:33:00
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
36页 527K
描述
Current Mode Boost Flyback and SEPIC Controller

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LTC1871HMS 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Active包装说明：TSSOP,
针数：10Reach Compliance Code：compliant
风险等级：5.67模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：36 V最小输入电压：2.5 V
标称输入电压：5 VJESD-30 代码：S-PDSO-G10
JESD-609代码：e3长度：3 mm
功能数量：1端子数量：10
封装主体材料：PLASTIC/EPOXY封装代码：TSSOP
封装形状：SQUARE封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：NOT SPECIFIED座面最大高度：1.1 mm
表面贴装：YES切换器配置：BOOST
技术：CMOS端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：0.5 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：3 mmBase Number Matches：1

LTC1871HMS 数据手册

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LTC1871  
Wide Input Range, No R  
™
SENSE  
Current Mode Boost,  
Flyback and SEPIC Controller  
DESCRIPTION  
The LTC®1871 is a wide input range, current mode, boost,  
flybackorSEPICcontrollerthatdrivesanN-channelpower  
MOSFET and requires very few external components. In-  
tendedforlowtomediumpowerapplications,iteliminates  
theneedforacurrentsenseresistorbyutilizingthepower  
MOSFET’s on-resistance, thereby maximizing efficiency.  
FEATURES  
n
High Efficiency (No Sense Resistor Required)  
n
Wide Input Voltage Range: 2.5V to 36V  
n
Current Mode Control Provides Excellent  
Transient Response  
n
High Maximum Duty Cycle (92% Typ)  
n
2% RUN Pin Threshold with 100mV Hysteresis  
n
1% Internal Voltage Reference  
The IC’s operating frequency can be set with an external  
resistor over a 50kHz to 1MHz range, and can be syn-  
chronized 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  
quiescentcurrentof10μAmaketheLTC1871ideallysuited  
for battery-operated systems.  
n
Micropower Shutdown: I = 10μA  
Q
n
Programmable Operating Frequency  
(50kHz to 1MHz) with One External Resistor  
Synchronizable to an External Clock Up to 1.3 × f  
n
n
n
n
n
OSC  
User-Controlled Pulse Skip or Burst Mode® Operation  
Internal 5.2V Low Dropout Voltage Regulator  
Output Overvoltage Protection  
For applications requiring constant frequency opera-  
tion, Burst Mode operation can be defeated using the  
MODE/SYNC pin. Higher output voltage boost, SEPIC  
and flyback applications are possible with the LTC1871  
by connecting the SENSE pin to a resistor in the source  
of the power MOSFET.  
Capable of Operating with a Sense Resistor for  
High Output Voltage Applications  
Small 10-Lead MSOP Package  
n
APPLICATIONS  
n
Telecom Power Supplies  
Portable Electronic Equipment  
The LTC1871 is available in the 10-lead MSOP package.  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
n
No R  
is a trademark of Linear Technology Corporation. All other trademarks are the  
SENSE  
property of their respective owners.  
TYPICAL APPLICATION  
V
IN  
3.3V  
Efficiency of Figure 1  
L1  
100  
90  
80  
70  
60  
50  
40  
30  
1μH  
D1  
RUN  
SENSE  
Burst Mode  
OPERATION  
V
OUT  
5V  
I
V
IN  
TH  
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
4.7μF  
X5R  
VCC  
+
R2  
37.4k  
1%  
R
T
80.6k  
1%  
MODE/SYNC  
22μF  
6.3V  
×2  
C
C2  
47pF  
GND  
1871 F01a  
C
C
C
:
TAIYO YUDEN JMK325BJ226MM  
: PANASONIC EEFUEOJ151R  
: TAIYO YUDEN JMK325BJ226MM  
D1: MBRB2515L  
IN  
0.001  
0.01  
0.1  
1
10  
L1: SUMIDA CEP125-H 1R0MH  
M1: FAIRCHILD FDS7760A  
OUT1  
OUT2  
OUTPUT CURRENT (A)  
1871 F01b  
Figure 1. High Efficiency 3.3V Input, 5V Output Boost Converter (Bootstrapped)  
1871fe  
1
1234567...36

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