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LTC3803

Linear Technology
Part Number LTC3803
Manufacturer Linear Technology
Description Flyback DC/DC Controller
Published Jun 8, 2009
Detailed Description LTC3803 Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT FEATURES n VIN and VOUT Limited Only by Ext...
Datasheet PDF File LTC3803 PDF File

LTC3803
LTC3803

Overview
LTC3803 Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT FEATURES n VIN and VOUT Limited Only by External Components n Adjustable Slope Compensation n Internal Soft-Start n Constant Frequency 200kHz Operation n ±1.
5% Reference Accuracy n Current Mode Operation for Excellent Line and Load Transient Response n No Minimum Load Requirement n Low Quiescent Current: 240μA n Low Profile (1mm) SOT-23 Package APPLICATIONS n Telecom Power Supplies n 42V and 12V Automotive Power Supplies n Auxiliary/Housekeeping Power Supplies n Power Over Ethernet L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT and No RSENSE are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
DESCRIPTION The LTC®3803 is a constant frequency current mode flyback controller optimized for driving N-channel MOSFETs in high input voltage applications.
Constant frequency operation is maintained down to very light loads, resulting in less low frequency noise generation over a wide range of load currents.
Slope compensation can be programmed with an external resistor.
The LTC3803 provides ±1.
5% output voltage accuracy and consumes only 240μA of quiescent current.
Ground-referenced current sensing allows LTC3803-based converters to accept input supplies beyond the LTC3803’s absolute maximum VCC.
A micropower hysteretic start-up feature allows efficient operation at high input voltages.
For simplicity, the LTC3803 can also be powered from a high VIN through a resistor, due to its internal shunt regulator.
An internal undervoltage lockout shuts down the LTC3803 when the input voltage is too low to provide sufficient gate drive to the external MOSFET.
The LTC3803 is available in a low profile (1mm) 6-lead SOT-23 (ThinSOT™) package.
TYPICAL APPLICATION 5V Output Nonisolated Telecom Housekeeping Power Supply 10μF 10V X5R 56k 0.
0022μF VIN 36V TO 72V 10k UPS840 T1 4.
7μF • 100V X5R • VC...


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