LT3668
Info : RECOMMENDED FOR NEW DESIGNS
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LT3668

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 6
1ku List Price Starting From $3.07
Features
  • 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
Additional Details
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The LT3668 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear tracking regulators (LDOs).This provides a complete and robust power solution for applications that require the power supply of a sensor to tightly track the power supply of a measurement ASIC.

Each tracking LDO supplies 200mA of output current with a typical dropout voltage of 340mV, and each LDO has an accurate resistor programmable current limit.

Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection.

The buck regulator includes a high efficiency switch, a boost diode, and the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application.

The LT3668 is available in a thermally-enhanced 16-lead MSOP package with exposed pad for low thermal resistance.

Applications

  • Fault-Protected Sensor Supply
  • Automotive and Industrial Supplies
  • Power for Portable Instrumentation
Part Models 6
1ku List Price Starting From $3.07

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3668EMSE#PBF
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Product Lifecycle

PCN

Feb 4, 2020

- 20_0132

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LT3668EMSE#PBF

PRODUCTION

LT3668EMSE#TRPBF

PRODUCTION

LT3668HMSE#PBF

PRODUCTION

LT3668HMSE#TRPBF

PRODUCTION

LT3668IMSE#PBF

PRODUCTION

LT3668IMSE#TRPBF

PRODUCTION

Filter by Model

reset

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Part Models

Product Lifecycle

PCN

Feb 4, 2020

- 20_0132

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Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LT3668EMSE#PBF

PRODUCTION

LT3668EMSE#TRPBF

PRODUCTION

LT3668HMSE#PBF

PRODUCTION

LT3668HMSE#TRPBF

PRODUCTION

LT3668IMSE#PBF

PRODUCTION

LT3668IMSE#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2243A

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

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DC2243A

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

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

Product Detail

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.

Tools & Simulations

Tools & Simulations 1

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.

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