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reference designLT8636 | Demoboard AD-GMSLCAMRPI-ADP

Analog Devices LT8636 | Demoboard AD-GMSLCAMRPI-ADP

42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current

Overview

TopologyOther Topology
Input voltage3.4-42 V
Switching frequency300-3000 kHz
Output 15 V / 5 A

Description

The LT®8636/LT8637 synchronous step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. Peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies.The LT8636’s ultralow 2.5µA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents. The LT8637has external compensation to enable current sharing and fast transient response at high switching frequencies. A CLKOUT pin enables synchronizing other regulators to the LT8636/LT8637.

Features

  • Silent Switcher ® Architecture
  • Ultralow EMI Emissions
  • Optional Spread Spectrum Modulation
  • High Efficiency at High Frequency
  • Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT
  • Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT
  • Wide Input Voltage Range: 3.4V to 42V
  • 5A Maximum Continuous, 7A Peak Transient Output
  • Ultralow Quiescent Current Burst Mode® Operation
  • 2.5µA IQ Regulating 12VIN to 3.3VOUT (LT8636)
  • Output Ripple < 10mVP-P
  • External Compensation: Fast Transient Response and Current Sharing (LT8637)
  • Fast Minimum Switch On-Time: 30ns
  • Low Dropout Under All Conditions: 100mV at 1A- Forced Continuous Mode
  • Adjustable and Synchronizable: 200kHz to 3MHz
  • Output Soft-Start and Power Good
  • Small 20-Lead 4mm × 3mm LQFN Package
  • AEC-Q100 Qualified for Automotive Applications

Typical applications

  • General Purpose Step-Down
  • Automotive and Industrial Supplies

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Qty.
Pins
Pitch(mm)
Type
L(mm)
H(mm)
IR(A)
Working Voltage(V (AC))
Packaging
Contact Resistance(mΩ)
SamplesAvailability & Sample
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744314076
SPECWE-HCI SMT Flat Wire High Current Inductor, 0.76 µH, 22.9 A
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance0.76 µH
Performance Rated Current22.9 A
Saturation Current @ 10%8 A
Saturation Current @ 30%15 A
DC Resistance2.25 mΩ
Self Resonant Frequency200 MHz
MaterialSuperflux 
Packaging Unit1000 
Pins2 
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Length7 mm
Height4.8 mm
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687122149022
SPECWR-FPC Zero Insertion Force Connectors - 0.50mm, –, –
Simu­lation–
Availability
–
Downloads8 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-FPC Zero Insertion Force Connectors - 0.50mm
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Packaging Unit2000 
Pins22 
Pitch0.5 mm
TypeHorizontal 
Length15.1 mm
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Rated Current0.5 A
Working Voltage50 V (AC)
PackagingTape and Reel 
Contact Resistance50 mΩ
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