LT8648SP

RECOMMENDED FOR NEW DESIGNS

42V, 15A Synchronous Step-Down Silent Switcher 2 with Exposed Back Package

Data Sheet (Rev. E) Product Selection Table

Part Models: 2
1ku List Price: Starting From $7.92

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Overview

Silent Switcher^®2 Architecture
- Ultralow EMI Emissions on Any PCB
- Eliminates PCB Layout Sensitivity
- Internal Bypass Capacitors Reduce Radiated EMI
- Optional Spread Spectrum Modulation
High Efficiency at High Frequency
- Up to 95.5% Efficiency at 1MHz, 12V_IN to 5V_OUT
- Up to 93% Efficiency at 2MHz, 12V_IN to 5V_OUT
Wide Input Voltage Range: 3V to 42V
15A Output Current
Low Quiescent Current Burst Mode^® Operation
- 100μA I_Q Regulating 12V_IN to 5V_OUT
- Output Ripple < 10mV_P-P

External Compensation: Fast Transient Response and Current Sharing
Fast Minimum Switch On-Time: 25ns
Low Dropout Under All Conditions: 35mV at 1A
Forced Continuous Mode
Adjustable and Synchronizable: 200kHz to 2.2MHz
Output Soft-Start and Power Good
Safely Tolerates High Reverse Current
36-Lead 7mm × 4mm LQFN Package (LT8648S) and Exposed Back Package (LT8648SP)
AEC-Q100 Qualified for Automotive Applications

The LT^®8648S/LT8648SP synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of input and boost capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by reducing layout sensitivity. This performance makes the LT8648S/ LT8648SP ideal for noise sensitive applications and environments.

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 25ns minimum on-time allows high step down ratios even at high switching frequencies. External compensation via the VC pin allows for fast transient response at high switching frequencies. The VC pin also enables current sharing and a CLKOUT pin enables synchronizing other regulators to the LT8648S/ LT8648SP.

Burst Mode operation enables low 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.

The LT8648SP package features an exposed back for heat sink attachment, which can be used to significantly improve thermal performance.

APPLICATIONS

Automotive and Industrial Supplies
General Purpose Step-Down

All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 8823345.

Part Models: 2
1ku List Price: Starting From $7.92

Documentation

Data Sheet 1

LT8648S: 42V, 15A Synchronous Step-Down Silent Switcher 2 Data Sheet (Rev.E) 02/04/2025

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
LT8648SPJV#WPBF	36-Lead LQFN (7mm × 4mm × 0.95mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8648SPJV#WTRPBF	36-Lead LQFN (7mm × 4mm × 0.95mm)	Material Declaration Reliablity Data 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:

LT8648S

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT8648S

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.

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