LT3663

PRODUCTION

1.2A Step-Down Switching Regulator with Output Current Limit

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Overview

  • Wide Input Range:
    • Operation from 7.5V to 36V
    • Overvoltage Lockout Protects Circuit through 60V Transients
  • Programmable Output Current Limit (0.4A to 1.2A)
  • 3.3V and 5V Fixed Output Voltage Options
  • Integrated Boost Diode
  • Fixed Frequency, Peak Current Mode Control
    • LT3663 fSW = 1.5MHz
    • LT3663-X fSW = 1MHZ
  • Low Switch VCESAT: 275mV at 1A
  • Internally Compensated
  • Thermal Protection
  • Thermally Enhanced 8-Pin 2mm × 3mm DFN and
LT3663
1.2A Step-Down Switching Regulator with Output Current Limit
5V Step-Down Converter Efficiency Product Package 1 Product Package 2 Product Package 3 Product Package 4
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Documentation

Data Sheet 1

User Guide 2

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Hot Swap Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Temperature Sensors 1
LTC2991
RECOMMENDED FOR NEW DESIGNS Octal I2C Voltage, Current, and Temperature Monitor
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Tools & Simulations

LTspice 3

Models for the following parts are available in LTspice:

  • LT3663
  • LT3663-3.3
  • LT3663-5
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC1570A-A

LT3663EDCB-3.3 Demo Board | Adj Current Limit, 7.5V ≤ VIN ≤ 36/60V, Vout = 3.3V @ 0.6A to 1.2A

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Product Details

Demonstration Circuit 1570 is a 1.0MHz current mode step-down switching regulator with programmable output current limit. The current limit accurately controls the system power dissipation and reduces the size of the power path components. The demo board operates with a 7.5V to 36V (60 transients) input voltage range and provides a 3.3V output. The current limit can be set to 0.6A, 0.AV, 1A or 1.2A using jumpers J2 and J3.



eval board
schematic 2
DC1570A-B

LT3663EDCB-5 Demo Board | Adj Current Limit, 7.5V ≤ VIN ≤ 36/60V, VOUT = 5V @ 0.6A to 1.2A

Buy Now View Details

Product Details

Demonstration Circuit 1570 is a 1.0MHz current mode step-down switching regulator with programmable output current limit. The current limit accurately controls the system power dissipation and reduces the size of the power path components. The demo board operates with a 7.5V to 36V (60 transients) input voltage range and provides a 5V output. The current limit can be set to 0.6A, 0.8A, 1A or 1.2A using jumpers J2 and J3.


 


eval board
schematic 3
DC1419A

LT3663EDCB Demo Board | Adjustable Current Limit, 7.5V ≤ VIN ≤ 36/60V, VOUT = 3.3V or 5V @ 0.6A to 1.2A

Buy Now View Details

Product Details

Demonstration Circuit 1419 is a 1.5MHz current mode step-down switching regulator with programmable output current limit featuring the LT3663. The current limit accurately controls the system power dissipation and reduces the size of the power path components. The demo board operates with a 7.5V to 36V (60 transients) input voltage range. The output can be set to 3.3V or 5V using jumper J4, and the current limit can be set to 0.6V, 0.8V, 1V or 1.2V using jumpers J2 and J3.
DC1570A-A
LT3663EDCB-3.3 Demo Board | Adj Current Limit, 7.5V ≤ VIN ≤ 36/60V, Vout = 3.3V @ 0.6A to 1.2A
DC1570A-A - Schematic
DC1570A-B
LT3663EDCB-5 Demo Board | Adj Current Limit, 7.5V ≤ VIN ≤ 36/60V, VOUT = 5V @ 0.6A to 1.2A
DC1570A-A - Schematic
DC1419A
LT3663EDCB Demo Board | Adjustable Current Limit, 7.5V ≤ VIN ≤ 36/60V, VOUT = 3.3V or 5V @ 0.6A to 1.2A
DC1419A - Schematic

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