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LTC3873-5

Linear Technology
Part Number LTC3873-5
Manufacturer Linear Technology
Description Boost/Flyback/SEPIC DC/DC Controller
Published Jun 8, 2009
Detailed Description LTC3873-5 No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller FEATURES n VIN and VOUT Limi...
Datasheet PDF File LTC3873-5 PDF File

LTC3873-5
LTC3873-5


Overview
LTC3873-5 No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller FEATURES 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) ThinSOTTM and (0.
75mm) 2mm × 3mm DFN Package APPLICATIONS n Telecom Power Supplies n Automotive Power Supplies n PoE Applications DESCRIPTION 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 normal 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.
PARAMETER VCC UV+ VCC UV– LTC3873 8.
4V 4V LTC3873-5 4.
1V 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.
TYPICAL APPLICATION High Efficiency 5V Input, 12V Output Boost Converter 4.
7nF 11.
8k 47pF 12k 1nF RUN/SS ITH VCC LTC3873-5 IPRG GND SW VFB NGATE 108k 10μH 10μF 22μF VIN 5V VOUT 12V 2A 38735 TA01a EFFICIENCY (%) Efficiency and Power Loss vs Load Current 100 90 80 70 60 50 40 30 20 10 0 10 10000 1000 100 100 IOUT (mA) 10 1000 3873 TA01b POWER...


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