LT8614 Series

42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Catalog

42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Part	Mounting Type	Supplier Device Package	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Type	Voltage - Output (Min/Fixed)	Output Configuration	Topology	Function	Voltage - Input (Max) [Max]	Voltage - Output (Max) [Max]	Number of Outputs	Voltage - Input (Min) [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Current - Output	Package / Case
Analog Devices LT8614IUDC#PBF	Surface Mount	20-QFN (3x4)	200 kHz	3 MHz	Adjustable	3.3 V	Positive	Buck	Step-Down	42 V	30 V	1	3.4 V	-40 °C	125 ¯C	4 A	18 Leads 20-WFQFN Exposed Pad
Analog Devices LT8614MPUDC#PBF	Surface Mount	20-QFN (3x4)	200 kHz	3 MHz	Adjustable	3.3 V	Positive	Buck	Step-Down	42 V	30 V	1	3.4 V	-55 °C	150 °C	4 A	18 Leads 20-WFQFN Exposed Pad
Analog Devices LT8614EUDC#PBF	Surface Mount	20-QFN (3x4)	200 kHz	3 MHz	Adjustable	3.3 V	Positive	Buck	Step-Down	42 V	30 V	1	3.4 V	-40 °C	125 ¯C	4 A	18 Leads 20-WFQFN Exposed Pad

Catalog

42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Key Features

• Silent Switcher®ArchitectureUltralow EMI Emissions

• Ultralow EMI Emissions

• High Efficiency at High FrequencyUp to 96% Efficiency at 1MHz, 12VINto 5VOUTUp to 94% Efficiency at 2MHz, 12VINto 5VOUT

• Up to 96% Efficiency at 1MHz, 12VINto 5VOUT

• Up to 94% Efficiency at 2MHz, 12VINto 5VOUT

• Wide Input Voltage Range: 3.4V to 42V

• Ultralow Quiescent Current Burst Mode®Operation:2.5μA IQRegulating 12VINto 3.3VOUTOutput Ripple < 10mVP-P

• 2.5μA IQRegulating 12VINto 3.3VOUT

• Output Ripple < 10mVP-P

• Fast Minimum Switch On-Time: 30ns

• Low Dropout Under All Conditions: 125mV at 1A

• Safely Tolerates Inductor Saturation in Overload

• Adjustable and Synchronizable: 200kHz to 3MHz

• Peak Current Mode Operation

• Accurate 1V Enable Pin Threshold

• Internal Compensation

• Output Soft-Start and Tracking

• Small 18-Lead 3mm × 4mm QFN

• AEC-Q100 Qualified for Automotive Applications

Description

The LT8614 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-Pat any load, from zero to full current.The LT8614 allows high VINto low VOUTconversion at high frequency with a fast minimum top switch on-time of 30ns. Operation is safe in overload even with a saturated inductor.Essential features are included and easy to use: An open-drain PG pin signals when the output is in regulation. The SYNC pin allows clock synchronization and choice of Burst Mode operation or pulse-skipping mode. 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.ApplicationsAutomotive and Industrial SuppliesGeneral Purpose Step-DownGSM Power Supplies