LT3641

PRODUCTION

Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer

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Part Models
10
1ku List Price
Starting From $4.37
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Part Details

  • High Voltage Buck Regulator:
    • 4V to 42V Operating Range
    • 1.3A Output Current
  • Input Transient Protection to 55V
  • Low Voltage Synchronous Buck Regulator:
    • 2.5V to 5.5V Input Voltage Range
    • 1.1A Output Current
  • Synchronizable, Adjustable 350kHz to 2.5MHz Switching Frequency
  • Programmable Power-On Reset Timer
  • Programmable Window Mode Watchdog Timer
  • Typical Quiescent Current: 290μA
  • Short-Circuit Robust
  • Programmable Soft-Start
  • Low Shutdown Current: IQ < 1μA
  • Thermal Shutdown
  • Available in Thermally Enhanced 28-Lead (4mm × 5mm) QFN and 28-Lead TSSOP Packages
LT3641
Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer
2MHz 5V/0.8A and 3.3V/0.5A Step Down Regulators HV Channel Efficiency, 2MHz, VOUT1 = 5V Product Package 1 Product Package 2 LV Channel Efficiency, 2MHz, VOUT2 = 3.3V
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Software Resources

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Hardware Ecosystem

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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT3641
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Evaluation Kits

eval board
schematic 1
DC1727A

LT3641EFE Demo Board | Power-On Reset and Watchdog Timer, 7V ≤ VIN ≤ 42V (55V Transients), VOUT1 = 5V @ 1A, VOUT2 = 1.8V @ 0.8A

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Product Details

Demonstration circuit 1727A is a dual monolithic buck regulator with power-on reset and watchdog timer featuring the LT3641. The board operates from inputs up to 42V and withstands transients up to 55V. The outputs are 5V, 1A and 1.8V, 0.8A. At light loads, both regulators operate in low ripple Burst Mode® to maintain high efficiency and low output ripple. The power-on reset and watchdog timer periods are independently adjustable using external capacitors.
DC1727A
LT3641EFE Demo Board | Power-On Reset and Watchdog Timer, 7V ≤ VIN ≤ 42V (55V Transients), VOUT1 = 5V @ 1A, VOUT2 = 1.8V @ 0.8A
DC1727A - Schematic

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