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LTC3873ETS8-5-PBF Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3873ETS8-5-PBF
Description  No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3873ETS8-5-PBF Datasheet(HTML) 1 Page - Linear Technology

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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, flyback 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 Profile (1mm) ThinSOT
TM and (0.75mm)
2mm
× 3mm DFN Package
n Telecom Power Supplies
n Automotive Power Supplies
n PoE Applications
Efficiency and Power Loss vs Load Current
High Efficiency 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
50
60
70
80
100
1000
3873 TA01b
30
20
10
0
90
100
100
1000
10
10000


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