LT8637 Series

42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Catalog

42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Part	Voltage - Output (Max) [Max]	Supplier Device Package	Package / Case	Voltage - Output (Min/Fixed) [Min]	Voltage - Input (Max) [Max]	Number of Outputs	Current - Output	Output Type	Voltage - Input (Min) [Min]	Output Configuration	Frequency - Switching [Min]	Frequency - Switching [Max]	Topology	Mounting Type	Function	Operating Temperature [Min]	Operating Temperature [Max]	Qualification	Grade
Analog Devices LT8637EV#PBF	42 V	20-LQFN (4x3)	20-TFQFN Exposed Pad	0.97 V	42 V	1	5 A	Adjustable	3.4 V	Positive	200 kHz	3 MHz	Buck	Surface Mount	Step-Down	-40 °C	125 ¯C
Analog Devices LT8637EV#WPBF	42 V	20-LQFN (4x3)	20-TFQFN Exposed Pad	0.97 V	42 V	1	5 A	Adjustable	3.4 V	Positive	200 kHz	3 MHz	Buck	Surface Mount	Step-Down	-40 °C	125 ¯C	AEC-Q100	Automotive
Analog Devices LT8637JV#PBF	42 V	20-LQFN (4x3)	20-TFQFN Exposed Pad	0.97 V	42 V	1	5 A	Adjustable	3.4 V	Positive	200 kHz	3 MHz	Buck	Surface Mount	Step-Down	-40 °C	150 °C

Catalog

42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

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 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, 7A Peak Transient Output

• Ultralow Quiescent Current Burst Mode®Operation2.5µA 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: 100mV at 1A

• Forced Continuous Mode

• Adjustable and Synchronizable: 200kHz to 3MHz

• Output Soft-Start and Power Good

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

• AEC-Q100 Qualified for Automotive Applications

Description

TheLT8636/LT8637 synchronous step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. Peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies.The LT8636’s ultralow 2.5µA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents. The LT8637 has external compensation to enable current sharing and fast transient response at high switching frequencies. A CLKOUT pin enables synchronizing other regulators to the LT8636/LT8637.Burst Mode operation enables ultralow 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 TR/SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin.APPLICATIONSAutomotive and Industrial SuppliesGeneral Purpose Step-Down