LTC3619B

PRODUCTION

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

Data Sheet Product Selection Table

Part Models: 8
1ku List Price: Starting From $2.72

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Part Details

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

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), I_Q < 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

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3619BEDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3619BEDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3619BEMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3619BEMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3619BIDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3619BIDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3619BIMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3619BIMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3619BEMSE#PBF	PRODUCTION
LTC3619BEMSE#TRPBF	PRODUCTION
LTC3619BIMSE#PBF	PRODUCTION
LTC3619BIMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
LTC3619BEMSE#PBF	PRODUCTION
LTC3619BEMSE#TRPBF	PRODUCTION
LTC3619BIMSE#PBF	PRODUCTION
LTC3619BIMSE#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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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
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Single-Supply Monitors 1
LTC2934	PRODUCTION	Ultra-Low Power Adjustable Supervisor with Power-Fail Output

Tools & Simulations

LTspice 1

LTC3619B Demo Circuit - Step-Down DC/DC with Average Input Current Limit (4.5-5.5V to 3.3V@0.4A & 3.4V@2A Pulsed Load)

Models for the following parts are available in LTspice:

LTC3619
LTC3619B

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

LTC3619BEDD 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.

Resources

DC1489A - Demo Manual
10/23/2009

DC1489A - Design Files
10/23/2009

DC1489A - Schematic
10/23/2009

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