LT8615

RECOMMENDED FOR NEW DESIGNS

42V, 3.5A Synchronous Step-down Regulator with 2.5μA Quiescent Current

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $1.65

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Part Details

Wide Input Voltage Range: 3V to 42V
Wide Output Voltage Range: 0.787V to (V_IN – 0.4V)
Ultralow Quiescent Current Burst Mode^®
Operation:
- <2.5μA IQ Regulating 12V_IN to 3.3V_OUT
- Output Ripple <10mV_P-P
Silent Switcher^® Powertrain for Ultralow EMI Emissions
High Efficiency 2MHz Synchronous Operation:
- Up to 93% Efficiency at 2MHz, 12V_IN to 5V_OUT
Fast Minimum Switch-On Time: 40ns
Very Low Dropout: 125mV at 1A

Adjustable and Synchronizable: 400kHz to 2.5MHz
Optional Spread-Spectrum Frequency Modulation
Fixed Frequency Peak Current-Mode Operation
Accurate 1V Enable Pin Threshold
Output Soft-Start and Tracking
Small 3mm × 3mm Side Wettable QFN Package
- Clearance Between High Voltage and Low Voltage Pins
- Excellent Solder Joint Reliability
AEC-Q100 Qualified for Automotive Applications
Temperature Grade 0: −40°C to +150°C, T_A

Part Models: 4
1ku List Price: Starting From $1.65

Documentation

Data Sheet 1

LT8615: 42V, 3.5A Synchronous Step-down Regulator with 2.5μA Quiescent Current Data Sheet (Rev.0) 11/12/2024

User Guide 1

EVAL-LT8615-AZ User Guide: 42V, 3.5A Synchronous Step-Down Regulator (Rev.0) 11/12/2024

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT8615RUDM#PBF	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8615RUDM#TRPBF	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8615RUDM#WPBF	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8615RUDM#WTRPBF	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Evaluation Kits

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Product Details

The evaluation board EVAL-LT8615-AZ is a 42V, 3.5A micropower synchronous step-down regulator with Silent Switcher^® powertrain featuring the LT^®8615.

The evaluation board is designed for a 5V output from a 5.5V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8615 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current when the output is regulated at 5V. Top and bottom power switches, compensation components, and other necessary circuits inside the LT8615 minimize external components and simplify design.

The SYNC pin on the evaluation board is grounded by default for low ripple burst mode operation. Moving JP1 to pulse skipping/sync position can change the operation mode to pulse skipping operation. To synchronize to an external clock, move JP1 to pulse skipping/sync and apply the external clock to the SYNC turret. Once JP1 is on the spread-spectrum position, V_CC is applied to the SYNC pin for low EMI spread spectrum operation. Figure 1on user guide shows the efficiency of the circuit.

The evaluation board has an EMI filter installed. Under spread-spectrum operation, the radiated and conducted EMI performances of the board (with EMI filter) are shown in Figure 2 and Figure 3 on user guide. The red lines in the figures are CISPR25 Class 5 peak limit. To use the EMI filter, the input should be tied to V_EMI, not V_IN. An inductor L2, which is a 0Ω jumper on the board by default now, can be added in the EMI filter to further reduce the conducted emission.

This board is suitable for a wide range of automotive, telecom, industrial, and other general-purpose applications. The LT8615 data sheet gives a complete description of the part, operation, and application information. Read the data sheet in conjunction with this user guide for the EVAL-LT8615-AZ.