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参数资料
| 型号： | LTC3873ITS8-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK TSOT23-8 |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 240kHz |
| 占空比： | 84% |
| 电源电压： | 4 V ~ 75 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 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： | SOT-23-8 薄型，TSOT-23-8 |
| 包装： | 带卷 (TR) |
LTC3873-5
No R SENSE TM Constant
Frequency Current Mode
Boost/Flyback/SEPIC
DC/DC Controller
FEATURES
DESCRIPTION
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V IN and V OUT Limited Only by External Components
Internal or Programmable External Soft-Start
Constant Frequency 200kHz Operation
Adjustable Current Limit
Current Sense Resistor Optional
±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load
Transient Response
4.1V Undervoltage Threshold for Logic Level
MOSFET Applications
Low Quiescent Current: 300μA
Low Pro?le (1mm) ThinSOT TM and (0.75mm)
2mm × 3mm DFN Package
The LTC ? 3873-5 is a constant frequency current mode
controller for boost, ?yback or SEPIC DC/DC converters
designed to drive an N-channel MOSFET for high input
and output voltage converter applications.
The LTC3873-5 provides ±1.5% output voltage accuracy
and consumes only 300μA quiescent current during nor-
mal operation and only 50μA during micropower start-up.
Using a 9.3V internal shunt regulator, the LTC3873-5 can
be powered from a high input voltage through a resistor
or it can be powered directly from a low impedance DC
voltage of 9V or less. Soft-start can be programmed using
an external capacitor.
APPLICATIONS
The LTC3873-5 is available in 8-lead ThinSOT and 2mm
× 3mm DFN packages.
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Telecom Power Supplies
Automotive Power Supplies
PoE Applications
PARAMETER LTC3873 LTC3873-5
V CC UV + 8.4V 4.1V
V CC UV – 4V 2.9V
L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No R SENSE and ThinSOT are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
High Ef?ciency 5V Input, 12V Output Boost Converter
Ef?ciency and Power Loss vs Load Current
100
10000
1nF
90
4.7nF
11.8k
47pF
I TH
RUN/SS
LTC3873-5
V CC
10μH
10μF
V IN
5V
80
70
60
1000
IPRG
V OUT
50
12k
GND
V FB
SW
NGATE
22μF
12V
2A
40
30
100
108k
38735 TA01a
20
10
0
10
10
100
1000
I OUT (mA)
3873 TA01b
38735fb
1
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