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reference designLT8646SA | Demoboard EVAL-LT8646SA-AZ

Analog Devices LT8646SA | Demoboard EVAL-LT8646SA-AZ

65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current

Overview

TopologyBuck Converter
Input voltage5.6-65 V
Switching frequency1850-2150 kHz
Output 15.15 V / 8 A
IC revisionA

Description

The LT8646SA 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 bypass capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by eliminating layout sensitivity.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 40ns minimum ontime allows high step-down ratios even at high switching frequencies. The LT8646SA has external compensation to enable current sharing and fast transient response at high switching frequencies.Burst Mode® operation enables ultralow 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.

Features

Silent Switcher®2 ArchitectureUltralow EMI Emissions on Any PCBEliminates PCB Layout SensitivityInternal Bypass Capacitors Reduce Radiated EMIOptional Spread Spectrum ModulationHigh Efficiency at High FrequencyUp to 94% Efficiency at 400kHz, 24VIN to 5VOUTUp to 93% Efficiency at 1MHz, 24VIN to 5VOUTWide Input Voltage Range: 3.4V to 65VWide Output Voltage Range: 0.97V to (VIN - 0.5V)Ultralow Quiescent Current Burst Mode Operation2.5μA IQ Regulating 12VIN to 3.3VOUT (LT8645SA)Output Ripple < 10mVP-PExternal Compensation: Fast Transient Response and Current Sharing (LT8646SA)Robust High VOUT OperationSafely Tolerates High Reverse CurrentFast Minimum Switch On-Time: 40nsLow Dropout Under All Conditions: 60mV at 1AAdjustable and Synchronizable: 200kHz to 2.2MHzOutput Soft-Start and TrackingSmall 32-Lead 6mm × 4mm LQFN PackageAEC-Q100 Qualified for Automotive Applications

Typical applications

More information

Parts approved by Analog Devices

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
Z @ 100 MHz(Ω)
Zmax(Ω)
Test Condition Zmax
IR(mA)
Z @ 1 GHz(Ω)
H(mm)
Type
Pins
Mount
L(mm)
Working Voltage(V (AC))
Operating Temperature
Packaging
SamplesAvailability & Sample
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74279226101
SPECWE-MPSB EMI Multilayer Power Suppression Bead, 100 Ω, 160 Ω
Simu­lation
Availability
–
Downloads10 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-MPSB EMI Multilayer Power Suppression Bead
Impedance @ 100 MHz100 Ω
Maximum Impedance160 Ω
Maximum Impedance1100 MHz 
Rated Current8000 mA
Impedance @ 1 GHz150 Ω
Height2.3 mm
TypeHigh Current 
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MountSMT 
Length4.5 mm
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Operating Temperature -55 °C up to +125 °C
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60800213421
SPECWR-PHD Jumper, –, –
Simu­lation–
Availability
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Downloads3 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWR-PHD Jumper
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–
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Rated Current3000 mA
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–
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Pins2 
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–
Working Voltage200 V (AC)
Operating Temperature -25 °C up to +105 °C
PackagingBag 
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62000821121
SPECWR-PHD Pin Header, –, –
Simu­lation–
Availability
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Downloads7 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
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–
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Rated Current2000 mA
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TypeStraight 
Pins8 
MountTHT 
Length8 mm
Working Voltage200 V (AC)
Operating Temperature -40 °C up to +105 °C
PackagingBag 
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Additional parts recommended by Würth Elektronik

Recommended parts are Würth Elektronik alternatives that are not formally approved for this reference design. Please verify it is suitable for your application, and contact us if you have any questions.

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
RDC max.(mΩ)
fres(MHz)
Mount
SamplesAvailability & Sample
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744393445022
SPECWE-XHMI SMT Power Inductor, 2.2 µH, 19.2 A
Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
Inductance2.2 µH
Performance Rated Current19.2 A
Saturation Current @ 30%17.7 A
DC Resistance8.3 mΩ
DC Resistance10.3 mΩ
Self Resonant Frequency27 MHz
MountSMT 
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