LT8608S

Name: LT8608S
Brand: Analog Devices
Price: 3.60 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

42V, 1.5A Synchronous Step-Down Regulator with 3μA Quiescent Current

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $3.60

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Overview

Silent Switcher^® 2 Architecture
- Ultralow EMI/EMC Emissions on Any PCB
- Eliminates PCB Layout Sensitivity
- Internal Bypass Capacitors Reduce Radiated EMI
- Optional Spread Spectrum Modulation
Wide Input Voltage Range: 3.0V to 42V
Ultralow Quiescent Current Burst Mode^® Operation:
- <3μA I_Q Regulating 12V_IN to 3.3V_OUT
- Output Ripple <10mV_P-P

High Efficiency 2MHz Synchronous Operation:
- >90% Efficiency at 0.75A, 5V_OUT from 12V_IN
1.5A Continuous Output Current
Fast Minimum Switch-On Time: 35ns
Adjustable and Synchronizable: 200kHz to 2.2MHz
Allows Use of Small Inductors
Low Dropout
Peak Current Mode Operation
Internal Compensation
Output Soft-Start and Tracking
Small 12-Lead LQFN Package

Part Models: 4
1ku List Price: Starting From $3.60

Documentation

Data Sheet 1

LT8608S: 42V, 1.5A Synchronous Step-Down Regulator with 3μA Quiescent Current Data Sheet (Rev.0) 05/26/2022

User Guide 1

DC2711A - Demo Manual (Rev.0) 10/07/2022

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
LT8608SEV#TRMPBF	LGA	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8608SEV#TRPBF	LGA	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8608SIV#TRMPBF	LGA	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8608SIV#TRPBF	LGA	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

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

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT8608
LT8608S

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT8608

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LT8608S | 42V, 1.5A Synchronous Step-Down Regulator

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Product Details

Demonstration circuit 2711A is a 42V, 1.5A synchronous step-down regulator featuring the LT8608S. The demo board is designed for 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 LT8608S is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator with the second-generation Silent Switcher^® structure that minimizes EMI and reduces PCB layout sensitivity. LT8608S consumes only 3μA of quiescent current when output is regulated at 5V. Top and bottom power switches, compensation components and other necessary circuits are inside of the LT8608S to minimize external components and simplify design.

The SYNC pin on the demo board is grounded by default for low ripple Burst Mode^® operation. Move JP1 to PULSE SKIPPING position can change the operation mode to pulse-skipping operation. Once JP1 is on SPREAD SPECTRUM position, V_CC is applied to the SYNC pin for low EMI spread spectrum operation. To synchronous to an external clock, move JP1 to SYNC and apply the external clock to the SYNC turret. Figure 1 in the demo manual shows the efficiency of the circuit.

The demo board has an EMI filter installed. The radiated EMI performances of the board (with EMI filter) are shown in Figure 2 and Figure 3 in the demo manual. The red lines in Figure 2 and Figure 3 are CISPR25 Class 5 peak limit. To use the EMI filter, the input should be tied to VEMI, not VIN. An inductor L2, which is shorted on the board by default now, can be added in the EMI filter to further reduce the conducted emission.

The LT8608S data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with the demo manual for DC2711A.