LT8604/LT8604C Series

High Efficiency 42V/120mA Synchronous Bucks

Catalog

High Efficiency 42V/120mA Synchronous Bucks

Part	Voltage - Output (Max) [Max]	Frequency - Switching [Max]	Frequency - Switching [Min]	Current - Output	Output Type	Voltage - Output (Min/Fixed)	Voltage - Input (Max) [Max]	Topology	Package / Case	Voltage - Input (Min) [Min]	Supplier Device Package	Operating Temperature [Min]	Operating Temperature [Max]	Output Configuration	Synchronous Rectifier	Function	Number of Outputs	Mounting Type
Analog Devices LT8604CAV#TRMPBF	42 V	2.2 MHz	200 kHz	120 mA	Adjustable	0.778 V	42 V	Buck	12-VFQFN Exposed Pad	2.9 V	12-LQFN (2x2)	-40 °C	125 ¯C	Positive		Step-Down	1	Surface Mount

Catalog

High Efficiency 42V/120mA Synchronous Bucks

Key Features

• High Efficiency 2MHz Synchronous Operation> 90% Efficiency at 50mA, 12VINto 5VOUTPin Selectable Forced Continuous or Burst Mode®Operation (LT8604C Only)

• > 90% Efficiency at 50mA, 12VINto 5VOUT

• Pin Selectable Forced Continuous or Burst Mode®Operation (LT8604C Only)

• Ultralow Quiescent Current Burst Mode Operation< 2.5μA IQRegulating 24VINto 3.3VOUTOutput Ripple < 10mVP-P

• < 2.5μA IQRegulating 24VINto 3.3VOUT

• Output Ripple < 10mVP-P

• Wide Input Voltage Range: 3.2V to 42V

• Fast Minimum Switch-On Time: 35ns

• Adjustable (All) and Synchronizable (LT8604C Only) Switching Frequency: 200kHz to 2.2MHz

• Accurate 1V Enable Pin Threshold (All) with Adjustable Hysteresis (LT8604C Only)

• Internal Compensation

• Output Soft-Start and Tracking

• Small 12-Lead 2mm × 2mm LQFN (LT8604C) and Small 10-Lead 3mm × 2mm Side-Wettable DFN Package

• AEC-Q100 Qualified for Automotive Applications (LT8604)

Description

The LT8604/LT8604C is a compact, high speed synchronous monolithic step-down switching regulator that delivers up to 120mA to the output with high efficiency at a constant frequency, even up to 2.2MHz. It accepts a wide input voltage range up to 42V and consumes only 2.5μA of quiescent current when operating in Burst Mode. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components.The LT8604C includes BST and INTVCCceramic capacitors for a more compact solution while having SYNC/MODE and HYST pins. The SYNC/MODE pin selects the regulator’s operation between forced continuous mode, for predictive interference in sampling systems, Burst Mode, for increased efficiency at light loads or spread spectrum for Low EMI. It also allows synchronization to an external clock to further increase signal to noise ratio in high-resolution acquisition systems.A PG flag signals when VOUTis within ±7.5% of the programmed output voltage and when in fault conditions. Thermal shutdown provides additional protection.ApplicationsIndustrial SensorsIndustrial Internet of Things4mA to 20mA Current LoopsFlow MetersAutomotive Housekeeping Supplies