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

The LTC3619 is a dual monolithic synchronous buck regulator using a constant frequency, current mode architecture.

The input supply voltage range is 2.5V to 5.5V, making it ideal for Li-Ion and USB powered applications. 100% duty cycle capability provides low dropout operation, extending the run time in battery-operated systems. Low output voltages are supported with the 0.6V feedback reference voltage. Channel 1 and channel 2 can supply 400mA and 800mA output current, respectively.

The LTC3619’s programmable average input current limit is ideal for USB applications and for point-of-load power supplies because the LTC3619’s limited input current will still allow its output to deliver high peak load currents without collapsing the input supply. When the sum of both channels’ currents exceeds the input current limit, channel 2 is current limited while channel 1 remains regulated. The operating frequency is internally set at 2.25MHz allowing the use of small surface mount inductors. Internal soft-start reduces in-rush current during start-up. The LTC3619 is available in small MSOP and 3mm × 3mm DFN packages and is also available in a low noise, high efficiency pulse skipping version, LTC3619B.

Light Load Operation
LTC3619 Low Ripple Burst Mode (< 20mVpp), Iq < 50uA
LTC3619B Pulse Skip (<5mVpp)

Applications

  • High Peak Load Current Applications
  • USB Powered Devices
  • Supercapacitor Charging
  • Radio Transmitters and Other Handheld Devices
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

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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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
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RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
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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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