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LTC3803-5

Features: 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...

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SeekIC No. : 004402354 Detail

LTC3803-5: Features: 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 Co...

LTC3803-5 Data Sheet

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Part Number:
LTC3803-5
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/21

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Product Details

Description



Features:

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


Application

42V and 12V Automotive Power Supplies
Telecom Power Supplies
Auxiliary/Housekeeping Power Supplies
Power Over Ethernet


Pinout

Connection Diagram


Specifications

VCC to GND (Current Fed) .................... 25mA into VCC*
NGATE Voltage ....................................... 0.3V to VCC
VFB, ITH/RUN Voltages ...........................0.3V to 3.5V
SENSE Voltage ........................................ 0.3V to 1V
NGATE Peak Output Current (<10µs) ...................... 1A
Operating Junction Temperature Range (Note 2)
LTC3803E-5 ....................................... 40°C to 85°C
LTC3803H-5 (Note 3) ....................... 40°C to 150°C
Storage Temperature Range .............65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C


Description

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. 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 LTC3803-5 provides ±1.5% output voltage accuracy and consumes only 240µA of quiescent current. Groundreferenced current sensing allows LTC3803-5-based converters 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 device is available in a low profile (1mm) 6-lead SOT-23 (ThinSOTTM) package.




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