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reference designLTC7805

Analog Devices LTC7805

40V Low IQ, Dual, 2-Phase 100% Duty Cycle Synchronous Step-Down Controller

Overview

TopologyBuck Converter
Input voltage4.5-38 V
Switching frequency100-3000 kHz
Output 11 V / 20 A
Output 22.5 V / 10 A

Description

The LTC®7805 is a high performance dual step-down synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7805 operates from a wide 4.5V to 40V input supply range. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase.The LTC®7805 is a high performance dual step-down synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7805 operates from a wide 4.5V to 40V input supply range. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase.The LTC7805 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.

Features

  • Wide Input Voltage Range: 4.5V to 40V
  • Wide Output Voltage Range: 0.8V to 40V
  • Low Operating IQ
  • 14μA (14V to 3.3V, Channel 1 On)
  • PassThru™/100% Duty Cycle Capable
  • Spread Spectrum Operation
  • RSENSE or DCR Current Sensing
  • Out-of-Phase Controllers Reduce Required InputCapacitance and Power Supply Induced Noise
  • Programmable Fixed Frequency (100kHz to 3MHz)
  • Phase-Lockable Frequency (100kHz to 3MHz)
  • Selectable Continuous, Pulse-Skipping, or LowRipple, Burst Mode® Operation at Light Loads
  • Power Good Output Voltage Monitors
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • Low Shutdown IQ: 1.5μA
  • Side Wettable 28-Lead 4mm × 5mm QFN Package
  • AEC-Q100 Automotive Qualification in Process

Typical applications

  • Industrial
  • Military / Avionics
  • Automotive and Transportation

More information

Parts approved by Analog Devices

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Data­sheet
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Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Qty.
LR(µH)
VOP(V)
SamplesAvailability & Sample
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744308020
SPECWE-HCM SMT High Current Flat Wire Inductor, 0.2 µH, 54 A
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Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCM SMT High Current Flat Wire Inductor
Inductance0.2 µH
Performance Rated Current54 A
Saturation Current @ 10%47 A
Saturation Current @ 30%64 A
DC Resistance0.37 mΩ
Self Resonant Frequency45 MHz
MaterialMnZn 
Packaging Unit500 
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Operating Voltage80 V
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744311100
SPECWE-HCI SMT Flat Wire High Current Inductor, 1 µH, 16.8 A
Simu­lation
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance1 µH
Performance Rated Current16.8 A
Saturation Current @ 10%8 A
Saturation Current @ 30%19 A
DC Resistance4.6 mΩ
Self Resonant Frequency85 MHz
MaterialSuperflux 
Packaging Unit1000 
Rated Inductance0.78 µH
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