LTC3619B
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LTC3619B

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

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 8
1ku List Price Starting From $2.72
Features
  • Programmable Average Input Current Limit: ±5% Accuracy
  • Dual Step-Down Outputs: Up to 96% Efficiency
  • Low Noise Pulse-Skipping Operation at Light Loads
  • 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 MS and 3mm × 3mm DFN Packages
Additional Details
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The LTC3619B 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 LTC3619B’s programmable average input current limit is ideal for USB applications and for point-of-load power supplies because the LTC3619B’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 LTC3619B is available in small MSOP and 3mm × 3mm DFN packages. The LTC3619B is also available in a low quiescent current, high efficiency Burst Mode® version, LTC3619.

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

Applications

  • High Peak Load Current Applications
  • USB Powered Devices
  • Supercapacitor Charging
  • Radio Transmitters and Other Handheld Devices
Part Models 8
1ku List Price Starting From $2.72

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3619BEDD#PBF
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LTC3619BEDD#TRPBF
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LTC3619BEMSE#PBF
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LTC3619BEMSE#TRPBF
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LTC3619BIDD#PBF
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LTC3619BIDD#TRPBF
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LTC3619BIMSE#PBF
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LTC3619BIMSE#TRPBF
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Product Lifecycle

PCN

Jun 5, 2024

- 24_0003

Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

LTC3619BEMSE#PBF

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LTC3619BEMSE#TRPBF

PRODUCTION

LTC3619BIMSE#PBF

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LTC3619BIMSE#TRPBF

PRODUCTION

Feb 4, 2020

- 20_0130

Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3619BEMSE#PBF

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LTC3619BEMSE#TRPBF

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LTC3619BIMSE#PBF

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LTC3619BIMSE#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jun 5, 2024

- 24_0003

arrow down

Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

LTC3619BEMSE#PBF

PRODUCTION

LTC3619BEMSE#TRPBF

PRODUCTION

LTC3619BIMSE#PBF

PRODUCTION

LTC3619BIMSE#TRPBF

PRODUCTION

Feb 4, 2020

- 20_0130

arrow down

Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3619BEMSE#PBF

PRODUCTION

LTC3619BEMSE#TRPBF

PRODUCTION

LTC3619BIMSE#PBF

PRODUCTION

LTC3619BIMSE#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC1489A-B

LTC3619BEDD Demo Board | 5V Input, VOUT1 = 3.3V @ 400mA, VOUT2 = 3.4V @ 500mA (2A Pulsed)

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DC1489A-B

LTC3619BEDD Demo Board | 5V Input, VOUT1 = 3.3V @ 400mA, VOUT2 = 3.4V @ 500mA (2A Pulsed)

LTC3619BEDD Demo Board | 5V Input, VOUT1 = 3.3V @ 400mA, VOUT2 = 3.4V @ 500mA (2A Pulsed)

Product Detail

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.

Tools & Simulations

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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