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LTC3803-5 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3803-5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC3803-5 38035f FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT ■ VIN and VOUT Limited Only by External Components ■ 4.8V Undervoltage Lockout Threshold ■ Operating Junction Temperature from –40°C to 150°C ■ Adjustable Slope Compensation ■ Internal Soft-Start ■ Constant Frequency 200kHz Operation ■ ±1.5% Reference Accuracy ■ Current Mode Operation for Excellent Line and Load Transient Response ■ No Minimum Load Requirement ■ Low Quiescent Current: 240µA ■ Low Profile (1mm) SOT-23 Package ■ 42V and 12V Automotive Power Supplies ■ Telecom Power Supplies ■ Auxiliary/Housekeeping Power Supplies ■ Power Over Ethernet ThinSOT is a trademark of Linear Technology Corporation. Dual Output Wide Input Range Converter The LTC ®3803-5 is a constant frequency current mode flyback controller optimized for driving 4.5V and 6V-rated N-channel MOSFETs in high input voltage applications. The LTC3803-5 operates from inputs as low as 5V. Con- stant 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 LTC3803-5 provides ±1.5% output voltage accuracy and consumes only 240µA of quiescent current. Ground- referenced current sensing allows LTC3803-5-based con- verters to accept input supplies beyond the LTC3803-5’s absolute maximum VCC. For simplicity, the LTC3803-5 can be powered from a high VIN through a resistor, due to its internal 8V shunt regulator. An internal undervoltage lockout shuts down the IC when the input voltage falls below 3.2V, guaranteeing at least 3.2V of gate drive to the external MOSFET. The LTC3803-5 is available in a low profile (1mm) 6-lead SOT-23 (ThinSOT TM) package. Efficiency and Power Loss vs Output Power , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ITH/RUN GND VFB LTC3803-5 NGATE VCC SENSE 10MQ100N B3100 1µF 100V 3x 13V/0.3A 20mA MIN LOAD 6.5V/1.2A 38035 TA01 0.012Ω 0.1µF 22k 7.5k 57.6k 8.06k 4.7k 10nF 1µF 100V 1µF 100V PHM25NQ10T ALL CAPACITORS ARE X7R, TDK VIN 6V TO 50V MMBTA42 22µF 10V 47µF 10V PDZ9.1B VPH5-0155 OUTPUT POWER (W) 02 90 85 80 75 70 65 60 3.0 2.5 2.0 1.5 1.0 0.5 0 4 68 10 38035 TA01b 12 VIN = 8V VIN = 12V VIN = 12V VIN = 24V VIN = 48V |
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