LT8642-1 Series

18V, 10A Synchronous Step-Down Silent Switcher

Catalog

18V, 10A Synchronous Step-Down Silent Switcher

Part	Voltage - Output (Max) [Max]	Function	Voltage - Output (Min/Fixed)	Voltage - Input (Min) [Min]	Topology	Output Configuration	Current - Output	Package / Case	Mounting Type	Voltage - Input (Max) [Max]	Synchronous Rectifier	Number of Outputs	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Type
Analog Devices LT8642EV-1#TRPBF	18 V	Step-Down	0.6 V	2.5 V	Buck	Positive	10 A	20-TFQFN Exposed Pad	Surface Mount	18 V		1	-40 °C	125 ¯C	20-LQFN (3x4)	200 kHz	3 MHz	Adjustable

Catalog

18V, 10A Synchronous Step-Down Silent Switcher

Key Features

• Silent Switcher®ArchitectureUltralow EMI EmissionsOptional Spread Spectrum Modulation

• Ultralow EMI Emissions

• Optional Spread Spectrum Modulation

• High Efficiency at High FrequencyUp to 96% Efficiency at 1MHz, 12VINto 3.3VOUTUp to 95% Efficiency at 2MHz, 12VINto 3.3VOUT

• Up to 96% Efficiency at 1MHz, 12VINto 3.3VOUT

• Up to 95% Efficiency at 2MHz, 12VINto 3.3VOUT

• Wide Input Voltage Range: 2.8V to 18V

• 10A Output Current

• External Compensation: Fast Transient Response and Current Sharing

• Low Quiescent Current Burst Mode® Operation240μA IQRegulating 12VINto 1.2VOUTOutput Ripple: <10mVP-P

• 240μA IQRegulating 12VINto 1.2VOUT

• Output Ripple: <10mVP-P

• Fast Minimum Switch On-Time: 20ns

• Low Dropout Under All Conditions: 50mV at 1A

• Forced Continuous Mode

• Adjustable and Synchronizable: 200kHz to 3MHz

• Output Soft-Start and Power Good

• Small 20-Lead 3mm × 4mm LQFN Package

Description

The LT8642-1 synchronous step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This performance makes the LT8642-1 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 20ns 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 LT8642-1.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.APPLICATIONSServer Power ApplicationsAutomotive and Industrial SuppliesGeneral Purpose Step-DownINTERNAL CAPACITORSPACKAGELT8642SVIN, BST, INTVCC4mm × 4mm LQFNLT8642-1None3mm × 4mm LQFN