LTC3619

PRODUCTION

400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit

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Overview

  • Programmable Average Input Current Limit: ±5% Accuracy
  • Dual Step-Down Outputs: Up to 96% Efficiency
  • Low Ripple (<25mVP-P) Burst Mode® Operation: IQ = 50μA
  • Input Voltage Range: 2.5V to 5.5V
  • Output Voltage Range: 0.6V to 5V
  • 2.25MHz Constant-Frequency Operation
  • Power Good Output Voltage Monitor for Each Channel
  • Low Dropout Operation: 100% Duty Cycle
  • Independent Internal Soft-Start for Each Channel
  • Current Mode Operation for Excellent Line and Load Transient Response
  • ±2% Output Voltage Accuracy
  • Short-Circuit Protected
  • Shutdown Current ≤ 1μA
  • Available in Small Thermally Enhanced 10-Lead MSE and 3mm × 3mm DFN Packages
LTC3619
400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit
Dual Monolithic Buck Regulator in 10-Lead 3mm × 3mm DFN GSM Pulse Load Product Package 1 Product Package 2
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Documentation

Data Sheet 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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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Supervisory Circuits & Reset ICs 1
LTC2934
PRODUCTION Ultra-Low Power Adjustable Supervisor with Power-Fail Output
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3619
  • LTC3619B
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
DC1489A-A

LTC3619EDD Demo Board | 5V Input, VOUT1 = 3.3V @ 400mA, VOUT2 = 3.4V @ 500mA (2A Pulsed)

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Product Details

Demonstration circuit 1489A is a synchronous buck dual regulator with adjustable input current limit featuring the LTC3619EDD(Burst mode operation)/LTC3619BEDD(pulse-skip mode) and is ideally suited for pulsed load applications where the input current needs to be limited. The -A board is for the LTC3619 while the -B board is for the LTC3619B. It is configured for 500mA maximum input current limit. The outputs are configured for a 3.3V/400mA continuous current output and a 3.4V output that can handle pulsed load currents up to 2A, with duty cycles up to 15%. The input voltage range is 5V ±10%. The fixed input current limited can be adjusted by replacing one resistor.
DC1489A-A
LTC3619EDD Demo Board | 5V Input, VOUT1 = 3.3V @ 400mA, VOUT2 = 3.4V @ 500mA (2A Pulsed)
DC1489A-A - Schematic

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