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LT8641JUDC DataSheet

LT8641JUDC DataSheet

Part No.
Part Marking
–40°C to 150°C
18-Lead (3mm × 4mm) Plastic QFN
File Size
2336 KB
26 Pages
Linear Technology
Upload Time
2022-06-01 16:25:50
Update Time
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LT8641JUDC Features

■ Silent Switcher® Architecture
 □ Ultralow EMI Emissions
 □ Spread Spectrum Frequency Modulation 
■ High Efficiency at High Frequency
 □ Up to 95% Efficiency at 1MHz, 12VIN to 5VOUT
 □ Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT
■ Wide Input Voltage Range: 3V to 65V 
■ 3.5A Maximum Continuous Output,5A Peak Transient Output
■ Ultralow Quiescent Current Burst Mode® Operation
 □ 2.5μA IQ Regulating 12VIN to 3.3VOUT 
 □ Output Ripple < 10mVP-P
■ Fast Minimum Switch On-Time: 35ns
■ Low Dropout Under All Conditions: 130mV at 1A 
■ Safely Tolerates Inductor Saturation in Overload
■ Adjustable and Synchronizable: 200kHz to 3MHz 
■ Peak Current Mode Operation
■ Output Soft-Start and Tracking
■ Small 18-Lead 3mm × 4mm QFN
■ AEC-Q100 Qualified for Automotive Applications

LT8641JUDC Applications

■ Automotive and Industrial Supplies
■ General Purpose Step-Down
■ GSM Power Supplies

LT8641JUDC Description

The LT8641JUDC step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultralow 2.5µA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents. Transient response remains excellent and output voltage ripple is below 10mVP-P at any load, from zero to full current.

The LT8641JUDC allows high VIN to low VOUT conversion at high frequency with a fast minimum top switch ontime of 35ns. Operation is safe in overload even with a saturated inductor.

Essential features are included and easy to use: An opendrain PG pin signals when the output is in regulation. The SYNC/MODE pin selects between Burst Mode, pulseskipping, or spread spectrum mode, and also allows synchronization to an external clock.  Soft-start and tracking functionality is accessed via the TR/SS pin. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin programs switch frequency.

Related LT8641JUDC Datasheet

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