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reference designLTC7813

Analog Devices LTC7813

Low IQ, 60V Synchronous Boost+Buck Controller

Overview

TopologyBuck-Boost Converter
Input voltage8-35 V
Output 124 V / 5 A
Output 25 V / 8 A
Output 312 V / 8 A

Description

The LTC®7813 is a high performance synchronousBoost+Buck DC/DC switching regulator controller thatdrives all N-channel power MOSFET stages. It containsindependent step-up (boost) and step-down (buck)controllers that can regulate two separate outputs or becascaded to regulate an output voltage from an inputvoltage that can be above, below, or equal to the outputvoltage. The LTC7813 operates from a wide 4.5V to 60Vinput supply range. When biased from the output of theboost regulator, the LTC7813 can operate from an inputsupply as low as 2.2V after start-up. The 34μA no-loadquiescent current (both channels on) extends operatingruntime in battery-powered systems

Features

Synchronous Boost and Buck Controllersnn When Cascaded, Allows VIN Above, Below, or Equalto Regulated VOUT of Up to 60Vnn Wide Bias Input Voltage Range: 4.5V to 60Vnn Output Remains in Regulation Through Input Dips(e.g. Cold Crank) Down to 2.2Vnn Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)nn Low EMI with Low Input and Output Ripplenn Fast Output Transient Responsenn No External Bootstrap Diodes Requirednn High Light Load Efficiencynn Low Operating IQ: 29μA (One Channel On)nn Low Operating IQ: 34μA (Both Channels On)nn RSENSE or Lossless DCR Current Sensingnn Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 60Vnn Boost Output Voltage Up 60Vnn Phase-Lockable Frequency (75kHz to 850kHz)nn Small 32-Pin 5mm × 5mm QFN Package

Typical applications

  • Automotive and Industrial Power Systems
  • High Power Battery Operated Systems

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.
RDC max.(mΩ)
LR(µH)
SamplesAvailability & Sample
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7443320100
SPECWE-HCC SMT High Current Cube Inductor, 1 µH, 34 A
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Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCC SMT High Current Cube Inductor
Inductance1 µH
Performance Rated Current34 A
Saturation Current @ 10%30.6 A
Saturation Current @ 30%33.5 A
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Self Resonant Frequency96 MHz
MaterialFerrite 
Packaging Unit300 
DC Resistance2.5 mΩ
Rated Inductance0.9 µH
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744325120
SPECWE-HCI SMT Flat Wire High Current Inductor, 1.2 µH, 32.6 A
Simu­lation
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance1.2 µH
Performance Rated Current32.6 A
Saturation Current @ 10%12 A
Saturation Current @ 30%25 A
DC Resistance1.8 mΩ
Self Resonant Frequency75 MHz
MaterialSuperflux 
Packaging Unit700 
DC Resistance1.98 mΩ
Rated Inductance1 µH
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744325240
SPECWE-HCI SMT Flat Wire High Current Inductor, 2.4 µH, 18.6 A
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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
Inductance2.4 µH
Performance Rated Current18.6 A
Saturation Current @ 10%6.9 A
Saturation Current @ 30%17 A
DC Resistance4.75 mΩ
Self Resonant Frequency67 MHz
MaterialSuperflux 
Packaging Unit700 
DC Resistance5.225 mΩ
Rated Inductance1.8 µH
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744325330
SPECWE-HCI SMT Flat Wire High Current Inductor, 3.3 µH, 16.6 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
Inductance3.3 µH
Performance Rated Current16.6 A
Saturation Current @ 10%5 A
Saturation Current @ 30%15 A
DC Resistance5.9 mΩ
Self Resonant Frequency54 MHz
MaterialSuperflux 
Packaging Unit700 
DC Resistance6.49 mΩ
Rated Inductance2.4 µH
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7443551370
SPECWE-HCI SMT Flat Wire High Current Inductor, 3.7 µH, 18.3 A
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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
Inductance3.7 µH
Performance Rated Current18.3 A
Saturation Current @ 10%7 A
Saturation Current @ 30%16 A
DC Resistance4.9 mΩ
Self Resonant Frequency26 MHz
MaterialWE-PERM 
Packaging Unit400 
DC Resistance5.39 mΩ
Rated Inductance2.6 µH
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7443551470
SPECWE-HCI SMT Flat Wire High Current Inductor, 4.7 µH, 14.9 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
Inductance4.7 µH
Performance Rated Current14.9 A
Saturation Current @ 10%6 A
Saturation Current @ 30%15 A
DC Resistance7 mΩ
Self Resonant Frequency30 MHz
MaterialWE-PERM 
Packaging Unit400 
DC Resistance7.59 mΩ
Rated Inductance3.4 µH
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7443320470
SPECWE-HCC SMT High Current Cube Inductor, 4.7 µH, 14.9 A
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCC SMT High Current Cube Inductor
Inductance4.7 µH
Performance Rated Current14.9 A
Saturation Current @ 10%15.6 A
Saturation Current @ 30%17.1 A
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Self Resonant Frequency43 MHz
MaterialFerrite 
Packaging Unit300 
DC Resistance7.9 mΩ
Rated Inductance3.2 µH
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7443551730
SPECWE-HCI SMT Flat Wire High Current Inductor, 7.3 µH, 16.5 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
Inductance7.3 µH
Performance Rated Current16.5 A
Saturation Current @ 10%5.5 A
Saturation Current @ 30%12 A
DC Resistance5.9 mΩ
Self Resonant Frequency28 MHz
MaterialWE-PERM 
Packaging Unit400 
DC Resistance6.49 mΩ
Rated Inductance5 µH
–Check availability