LT8640A Series

42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Catalog

42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Part	Topology	Function	Current - Output	Voltage - Output (Min/Fixed)	Voltage - Input (Max) [Max]	Package / Case	Supplier Device Package	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Configuration	Voltage - Input (Min) [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Number of Outputs	Mounting Type	Output Type	Voltage - Output (Max) [Max]	Output Type	Voltage - Output (Min/Fixed) [Min]
Analog Devices LT8640AJUDCM-3.3#TRPBF	Buck	Step-Down	5 A	3.3 V	42 V	20-WFQFN Exposed Pad 18 Leads	20-QFN (3x4)	200 kHz	3 MHz	Positive	2.9 V	150 °C	-40 °C	1	Surface Mount Wettable Flank	1.81 mOhm
Analog Devices LT8640AJUDCM#TRPBF	Buck	Step-Down	5 A		42 V	20-WFQFN Exposed Pad 18 Leads	20-QFN (3x4)	200 kHz	3 MHz	Positive	2.9 V	150 °C	-40 °C	1	Surface Mount Wettable Flank		41.58 V	Adjustable	0.97 V
Analog Devices LT8640AJUDCM-3.3#PBF	Buck	Step-Down	5 A	3.3 V	42 V	20-WFQFN Exposed Pad 18 Leads	20-QFN (3x4)	200 kHz	3 MHz	Positive	2.9 V	150 °C	-40 °C	1	Surface Mount Wettable Flank	1.81 mOhm

Catalog

42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Key Features

• Silent Switcher®ArchitectureUltralow EMI EmissionsSpread Spectrum Frequency Modulation

• Ultralow EMI Emissions

• Spread Spectrum Frequency Modulation

• High Efficiency at High FrequencyUp to 96% Efficiency at 1MHz, 12VINto 5VOUTUp to 95% Efficiency at 2MHz, 12VINto 5VOUT

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

• Up to 95% Efficiency at 2MHz, 12VINto 5VOUT

• Wide Input Voltage Range: 3.4V to 42V

• 5A Maximum Continuous, 8A Peak Transient Output

• Ultralow Quiescent Current Burst Mode®Operation2.5μA IQ Regulating 12VINto 3.3VOUTOutput Ripple < 10mVP-P

• 2.5μA IQ Regulating 12VINto 3.3VOUT

• Output Ripple < 10mVP-P

• Fast Minimum Switch On-Time: 30ns

• Low Dropout Under All Conditions: 100mV at 1A

• Available in Fixed 3.3V Output

• Forced Continuous Mode

• Safely Tolerates High Reverse Current

• Adjustable and Synchronizable: 200kHz to 3MHz

• Peak Current Mode Operation

• Output Soft-Start and Tracking

• Small 18-Lead 3mm × 4mm Side Solderable QFN with Improved Solder Joint Reliability

• AEC-Q100 Qualified for Automotive Applications

Description

The LT8640A step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at frequencies up to 3MHz. An ultralow 2.5μA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents.The LT8640A allows high VINto low VOUTconversion at high frequency with a fast minimum top switch on-time of 30ns. The SYNC/MODE pin selects between Burst Mode operation, spread spectrum mode, synchronization to an external clock, and forced continuous mode.ApplicationsAutomotive and Industrial SuppliesGeneral Purpose Step-Down