LT3668

RECOMMENDED FOR NEW DESIGNS

40V 400mA Step-Down Switching Regulator with Dual Fault Protected Tracking LDOs

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Part Details

  • Dual Low Dropout Linear Tracking Regulators
    • 200mA Outputs with Programmable Current Limits
    • 1.6V to 45V Input Range
    • Fault Protected to ±45V
  • Triple Output Supply from a Single Input Requires Only One Inductor
  • IQ = 50μA at 12VIN to 6V and 5V with No Load
  • Buck Regulator:
    • Low Ripple (<15mVP-P) Burst Mode® Operation
    • 400mA Output with Internal Power Switch
    • 4.3V to 40V Input Operation Range (60V Max)
  • Adjustable 250kHz to 2.2MHz Switching Frequency
  • Power Good Indicator
  • Available in a Thermally-Enhanced 16-Lead MSOP Package
LT3668
40V 400mA Step-Down Switching Regulator with Dual Fault Protected Tracking LDOs
No-Load Supply Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Hardware Ecosystem

Parts Product Life Cycle Description
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT3668
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
DC2243A

LT3668EMSE Demo Board | 40V Buck Plus Dual Post-Regulator LDOs

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Product Details

Demonstration circuit 2243A is a triple power supply that includes one 400mA step-down regulator and two 200mA low dropout (LDO) linear tracking regulators featuring the LT3668. The demo circuit is designed for one 6V and dual 5V outputs from a 7V to 40V input. Two LDO outputs are configured as post-regulators of the switching regulator output. The total current capability of three output channels is up to 400mA, while the two LDO regulators are capable of 200mA each.
DC2243A
LT3668EMSE Demo Board | 40V Buck Plus Dual Post-Regulator LDOs
DC2243A - Schematic

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