LT3667

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet Product Selection Table
Part Models
12
1ku List Price
Starting From $3.07
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Part Details

  • Triple Output Supply from a Single Input Requires Only One Inductor
  • IQ = 50μA at 12VIN to 5V, 3.3V and 2.5V 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)
  • Dual Low Dropout Linear Regulators
    • 200mA Outputs with Programmable Current Limits
    • 1.6V to 45V Input Range
    • Fault Protected to ±45V
  • Adjustable 250kHz to 2.2MHz Switching Frequency
  • Synchronizable Between 300kHz and 2.2MHz
  • Programmable Undervoltage Lockout
  • Power Good Indicators
  • Available in a Thermally-Enhanced 16-Lead MSOP and 24-Lead (3mm × 5mm) QFN Packages
LT3667
40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs
No-Load Supply Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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

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Hardware Ecosystem

Parts Product Life Cycle Description
High Voltage Hot Swap Controllers 1
LTC4364
RECOMMENDED FOR NEW DESIGNS Surge Stopper with Ideal Diode
PowerPath, Ideal Diodes, and Load Switches 1
LTC4417
RECOMMENDED FOR NEW DESIGNS Prioritized PowerPath™ Controller
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT3667
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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
DC1869A

LT3667 Demo Board | Buck Plus Dual Fault-Protected LDOs, 6V ≤ VIN ≤40V, VOUT1 = 5V, VOUT2/VOUT3 = 3.3V/2.5V @ 200mA

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Product Details

Demonstration circuit 1869A is a triple power supply including one 400mA step-down regulator and two 200mA low dropout linear regulators (LDOs) featuring the LT3667. The demo circuit is designed for 5.0V, 3.3V and 2.5V outputs from a 6V 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 in this configuration, while the two LDO regulators are capable of 200mA each.


 
DC1869A
LT3667 Demo Board | Buck Plus Dual Fault-Protected LDOs, 6V ≤ VIN ≤40V, VOUT1 = 5V, VOUT2/VOUT3 = 3.3V/2.5V @ 200mA
DC1869A - Schematic

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