LT8650S Series

Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current

Catalog

Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current

Part	Number of Outputs	Voltage - Output (Min/Fixed)	Mounting Type	Voltage - Output (Max) [Max]	Output Configuration	Topology	Grade	Supplier Device Package	Function	Voltage - Input (Min) [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Input (Max) [Max]	Output Type	Package / Case	Qualification	Frequency - Switching [Max]	Frequency - Switching [Min]	Current - Output
Analog Devices LT8650SIV#TRPBF	2	0.8 V	Surface Mount	42 V	Positive	Buck	Automotive	32-LQFN (6x4)	Step-Down	2.6 V	-40 °C	125 ¯C	42 V	Adjustable	32-TFQFN Exposed Pad 28 Leads	AEC-Q100	3 MHz	300 kHz	4 A
Analog Devices LT8650SPJV#PBF	2	0.8 V	Surface Mount	42 V	Positive	Buck		32-LQFN (6x4)	Step-Down	2.6 V	-40 °C	150 °C	42 V	Adjustable	32-TFQFN Exposed Pad		3 MHz	300 kHz	6 A
Analog Devices LT8650SHV#PBF	2	0.8 V	Surface Mount	42 V	Positive	Buck		32-LQFN (6x4)	Step-Down	2.6 V	-40 °C	150 °C	42 V	Adjustable	32-TFQFN Exposed Pad 28 Leads		3 MHz	300 kHz	4 A
Analog Devices LT8650SEV#TRPBF	2	0.8 V	Surface Mount	42 V	Positive	Buck		32-LQFN (6x4)	Step-Down	2.6 V	-40 °C	125 ¯C	42 V	Adjustable	32-TFQFN Exposed Pad 28 Leads		3 MHz	300 kHz	4 A
Analog Devices LT8650SPJV#TRPBF	2	0.8 V	Surface Mount	42 V	Positive	Buck	Automotive	32-LQFN (6x4)	Step-Down	2.6 V	-40 °C	150 °C	42 V	Adjustable	32-TFQFN Exposed Pad	AEC-Q100	3 MHz	300 kHz	6 A
Analog Devices LT8650SHV-1#PBF	2	0.8 V	Surface Mount	42 V	Positive	Buck		32-LQFN (6x4)	Step-Down	2.6 V	-40 °C	150 °C	42 V	Adjustable	32-TFQFN Exposed Pad 28 Leads		3 MHz	300 kHz	4 A

Catalog

Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current

Key Features

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

• Ultralow EMI on Any PCB

• Eliminates PCB Layout Sensitivity

• Internal Bypass Capacitors Reduce Radiated EMI

• Optional Spread Spectrum Modulation

• 4A DC from Each Channel Simultaneously

• Up to 6A on Either Channel

• Ultralow Quiescent Current Burst Mode®Operation:6.2μA IQRegulating 12VINto 5VOUT1and 3.3VOUT2Output Ripple <10mVP-P

• 6.2μA IQRegulating 12VINto 5VOUT1and 3.3VOUT2

• Output Ripple <10mVP-P

• Optional External VC Pin: Fast Transient Response and Current Sharing (Extra 50µA IQ/Channel)

• Forced Continuous Mode

• High Efficiency at High Frequency

• 94.6% Efficiency at 2A, 5VOUTfrom 12VINat 2MHz

• 93.3% Efficiency at 4A, 5VOUTfrom 12VINat 2MHz

• Fast Minimum Switch-On Time: 40ns

• Wide Input Voltage Range: 3.0V to 42V

• Adjustable and Synchronizable: 300kHz to 3MHz

• Small 4mm × 6mm 32-Pin LQFN Package

• AEC-Q100 Qualified for Automotive Applications

Description

The LT8650S is a dual step-down regulator that delivers up to 4A of continuous current from both channels and supports loads up to 6A from each channel. The LT8650S features the second generation Silent Switcher architecture to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes integration of bypass capacitors to optimize high frequency current loops and make it easy to achieve advertised EMI performance by eliminating layout sensitivity.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 40ns minimum on-time allows high step down ratios at high switching frequencies.Burst Mode operation features a 6.2μA quiescent current resulting in high efficiency at low output currents, forced continuous mode allows fixed switching frequency operation over the entire output load range, and spread spectrum operation can further reduce EMI emissions. External VC pins allow optimal loop compensation for fast transient response. The VC pins can also be used for current sharing and the CLKOUT pin enables synchronizing two LT8650S chips to generate a 4-phase, 16A supply.ApplicationsGeneral Purpose Step-DownAutomotive and Industrial Supplies