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参数资料
| 型号： | LTC3873ITS8-5#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封装： | 1 MM HEIGHT, LEAD FREE, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件页数： | 1/16页 |
| 文件大小： | 170K |
| 代理商： | LTC3873ITS8-5#PBF |
LTC3873-5
1
38735fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
No RSENSETM Constant
Frequency Current Mode
Boost/Flyback/SEPIC
DC/DC Controller
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.
The LTC3873-5 is available in 8-lead ThinSOT and 2mm
× 3mm DFN packages.
n VIN and VOUT Limited Only by External Components
n Internal or Programmable External Soft-Start
n Constant Frequency 200kHz Operation
n Adjustable Current Limit
n Current Sense Resistor Optional
n ±1.5% Voltage Reference Accuracy
n Current Mode Operation for Excellent Line and Load
Transient Response
n 4.1V Undervoltage Threshold for Logic Level
MOSFET Applications
n Low Quiescent Current: 300μA
n Low Prole (1mm) ThinSOT
TM and (0.75mm)
2mm
× 3mm DFN Package
n Telecom Power Supplies
n Automotive Power Supplies
n PoE Applications
Efciency and Power Loss vs Load Current
High Efciency 5V Input, 12V Output Boost Converter
PARAMETER
LTC3873
LTC3873-5
VCC UV+
8.4V
4.1V
VCC UV–
4V
2.9V
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No RSENSE and ThinSOT are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
ITH
IPRG
GND
VFB
VCC
SW
NGATE
LTC3873-5
38735 TA01a
RUN/SS
11.8k
12k
108k
10μF
22μF
4.7nF
47pF
10μH
VIN
5V
VOUT
12V
2A
1nF
IOUT (mA)
10
40
EFFICIENCY
(%)
POWER
LOSS
(mW)
50
60
70
80
100
1000
3873 TA01b
30
20
10
0
90
100
1000
10
10000
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