LT8648S Series

42V, 15A Synchronous Step-Down Silent Switcher 2

Catalog

42V, 15A Synchronous Step-Down Silent Switcher 2

Part	Frequency - Switching [Max]	Frequency - Switching [Min]	Current - Output	Function	Package / Case	Grade	Output Type	Supplier Device Package	Topology	Mounting Type	Number of Outputs	Voltage - Output (Min/Fixed)	Output Configuration	Voltage - Input (Max) [Max]	Synchronous Rectifier	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Input (Min) [Min]	Voltage - Output (Max) [Max]	Qualification
Analog Devices LT8648SEV#TRPBF	2.2 MHz	200 kHz	15 A	Step-Down	36-TFQFN Exposed Pad	Automotive	Adjustable	36-LQFN (7x4)	Buck	Surface Mount	1	0.6 V	Positive	42 V		-40 °C	125 ¯C	2.45 V	42 V	AEC-Q100

Catalog

42V, 15A Synchronous Step-Down Silent Switcher 2

Key Features

• Silent Switcher®2 ArchitectureUltralow EMI Emissions on Any PCBEliminates PCB Layout SensitivityInternal Bypass Capacitors Reduce Radiated EMIOptional Spread Spectrum Modulation

• Ultralow EMI Emissions on Any PCB

• Eliminates PCB Layout Sensitivity

• Internal Bypass Capacitors Reduce Radiated EMI

• Optional Spread Spectrum Modulation

• High Efficiency at High FrequencyUp to 95.5% Efficiency at 1MHz, 12VINto 5VOUTUp to 93% Efficiency at 2MHz, 12VINto 5VOUT

• Up to 95.5% Efficiency at 1MHz, 12VINto 5VOUT

• Up to 93% Efficiency at 2MHz, 12VINto 5VOUT

• Low Quiescent Current Burst Mode®Operation100μA IQRegulating 12VINto 5VOUTOutput Ripple < 10mVP-P

• 100μA IQRegulating 12VINto 5VOUT

• Output Ripple < 10mVP-P

• Wide Input Voltage Range: 3V to 42V

• 15A Output Current

• External Compensation: Fast Transient Response and Current Sharing

• Fast Minimum Switch On-Time: 25ns

• Low Dropout Under All Conditions: 35mV at 1A

• Forced Continuous Mode

• Adjustable and Synchronizable: 200kHz to 2.2MHz

• Output Soft-Start and Power Good

• Safely Tolerates High Reverse Current

• Small 36-Lead 7mm × 4mm LQFN Package

• AEC-Q100 Qualified for Automotive Applications

Description

The LT8648S synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of input and boost capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by reducing layout sensitivity. This performance makes the LT8648S ideal for noise sensitive applications and environments.The fast, clean, low overshoot switching edges enable high efficiency operation even at high switching frequencies, leading to a small overall solution size. Peak current mode control with a 25ns minimum on-time allows high step down ratios even at high switching frequencies. External compensation via the VCpin allows for fast transient response at high switching frequencies. The VCpin also enables current sharing and a CLKOUT pin enables synchronizing other regulators to the LT8648S.Burst Mode operation enables low standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spread spectrum operation can further reduce EMI emissions. Soft-start and tracking functionality is accessed via the SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin.APPLICATIONSAutomotive and Industrial SuppliesGeneral Purpose Step-DownAll registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 8823345.