LT3640

PRODUCTION

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

Data Sheet Product Selection Table
Part Models
8
1ku List Price
Starting From $4.19
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Part Details

  • High Voltage Buck Regulator:
    • 4V to 35V Operating Range
    • 1.3A Output Current
  • OVLO Protects Input 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
  • Available in Thermally Enhanced 28-Lead (4mm × 5mm) QFN and 28-Lead TSSOP Packages
LT3640
Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer
2MHz 3.3V/0.8A and 1.8V/0.8A Step Down Regulators HV Channel Efficiency, 2MHz, VOUT1 = 3.3V Product Package 1 Product Package 2 LV Channel Efficiency, 2MHz, VOUT2 = 1.8V
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 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
Digital Power System Managers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
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LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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 2

Models for the following parts are available in LTspice:

  • LT3640
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
DC1359A

LT3640EFE Demo Board | 5V ≤ VIN ≤ 35V(55V Transients), VOUT1 = 1.2V @ 1A, VOUT2 = 3.3V @ 0.8A

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Product Details

Demonstration circuit 1359 is a Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer featuring the LT3640. The board operates from inputs ranging from 5V to to 35V and withstands transients up to 55V. The outputs are 3.3V @ 0.8A and 1.2V @ 1A.
DC1359A
LT3640EFE Demo Board | 5V ≤ VIN ≤ 35V(55V Transients), VOUT1 = 1.2V @ 1A, VOUT2 = 3.3V @ 0.8A
DC1359A - Schematic

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