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参数资料
| 型号： | LTC1871IMS-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 1/36页 |
| 文件大小： | 523K |
| 代理商： | LTC1871IMS-1 |
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LTC1871-1
1
18711fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Wide Input Range, No RSENSE
Current Mode Boost,
Flyback and SEPIC Controller
The LTC1871-1 is a wide input range, current mode, boost,
yback 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
efciency. Higher output voltage applications are possible
with the LTC1871-1 by connecting the SENSE pin to a
resistor in the source of the power MOSFET.
The IC’s operating frequency can be set with an external
resistor over a 50kHz to 1MHz range, and can be synchro-
nized to an external clock using the MODE/SYNC pin.
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.
The LTC1871-1 is available in the 10-lead MSOP package.
Efciency of Figure 1
n High Efciency (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
n Ultra Low Pulse Skip Threshold for Wide Input
Range Applications
n Micropower Shutdown: IQ = 10μA
n Programmable Operating Frequency
(50kHz to 1MHz) with One External Resistor
n Synchronizable to an External Clock Up to 1.3 × fOSC
n User-Controlled Pulse Skip or Burst Mode Operation
n Internal 5.2V Low Dropout Voltage Regulator
n Output Overvoltage Protection
n Capable of Operating with a Sense Resistor for High
Output Voltage Applications
n Small 10-Lead MSOP Package
n Telecom Power Supplies
n Portable Electronic Equipment
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Figure 1. High Efciency 3.3V Input, 5V Output Boost Converter (Bootstrapped)
+
RUN
ITH
FB
FREQ
MODE/SYNC
SENSE
VIN
INTVCC
GATE
GND
LTC1871-1
RT
80.6k
1%
R2
37.4k
1%
R1
12.1k
1%
CVCC
4.7μF
X5R
CIN
22μF
6.3V
×2
M1
D1
L1
1μH
RC
22k
CC1
6.8nF
CC2
47pF
COUT1
150μF
6.3V
×4
VIN
3.3V
VOUT
5V
7A
(10A PEAK)
GND
18711 F01a
+
COUT2
22μF
6.3V
X5R
×2
CIN:
TAIYO YUDEN JMK325BJ226MM
COUT1: PANASONIC EEFUEOJ151R
COUT2: TAIYO YUDEN JMK325BJ226MM
D1: MBRB2515L
L1: SUMIDA CEP125-H 1R0MH
M1: FAIRCHILD FDS7760A
OUTPUT CURRENT (A)
30
EFFICIENCY
(%)
90
100
80
50
70
60
40
0.001
0.1
1
10
18711 F01b
0.01
Burst Mode
OPERATION
PULSE-SKIP
MODE
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1871IMS-1#PBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1871IMS-1#TRPBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1871IMS-7 | 制造商:Linear Technology 功能描述:DP-SWREG/Controller, No Rsense DC/DC Controller Boost, Flyback & SEPIC |
| LTC1871IMS-7#PBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1871IMS-7#TRPBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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