LT8638-2

RECOMMENDED FOR NEW DESIGNS

42V, 10A/12A Peak Synchronous Step-Down Silent Switcher

Data Sheet (Rev. A) Product Selection Table

Part Models: 2
1ku List Price: Starting From $6.71

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Overview

Silent Switcher^® Architecture

Ultralow EMI Emissions
Optional Spread Spectrum Modulation

High Efficiency at High Frequency

Up to 96% Efficiency at 1MHz, 12V_IN to 5V_OUT
Up to 94% Efficiency at 2MHz, 12V_IN to 5V_OUT

Wide Input Voltage Range: 2.8V to 42V
10A Maximum Continuous, 12A Peak Transient Output
Fast Transient Response with External Compensation
Low Quiescent Current Burst Mode^® Operation

90μA I_Q Regulating 12V_IN to 5V_OUT
Output Ripple < 10mV_P-P

Reference Accuracy: ±1% Over Temperature
Fast Minimum Switch On-Time: 25ns
PolyPhase^® Operation: Up to 12 Phases
Low Dropout Under All Conditions: 45mV at 1A
Adjustable and Synchronizable: 200kHz to 3MHz
Output Soft-Start and Power Good
Safely Tolerates High Reverse Current
28-Lead 5mm × 4mm LQFN Package
AEC-Q100 Qualified for Automotive Applications

The LT8638-2 synchronous step-down regulator features the Silent Switcher^® architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This performance makes the LT8638-2 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 ontime allows high step down ratios even at high switching frequencies. External compensation through the V_C pin allows for fast transient response. PolyPhase operation allows multiple LT8638-2 regulators to run with interleaving phase shift to provide more output current.

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. Soft-start and tracking functionality is accessed through the SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin.

Applications

Automotive and Industrial Supplies
General Purpose Step-Down

Part Models: 2
1ku List Price: Starting From $6.71

Documentation

Data Sheet 1

LT8638-2: 42V, 10A/12A Peak Synchronous Step-Down Silent Switcher Data Sheet (Rev.A) 09/16/2024

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
LT8638RV-2#WPBF	28-Lead LQFN (5mm x 4mm x 0.94mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8638RV-2#WTRPBF	28-Lead LQFN (5mm x 4mm x 0.94mm)	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:

LT8638S

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT8638S

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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