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reference designLTC7852-1

Analog Devices LTC7852-1

Dual Output, 6-Phase,Multiphase Current Mode Synchronous Controller with Current Monitoring

Overview

TopologyBuck Converter
Input voltage4.5-5.5 V
Switching frequency250-1200 kHz
Output 10.5 V / 330 A

Description

The LTC®7852/LTC7852-1 is a six-phase, dual outputcurrent mode synchronous step-down switching regulatorcontroller that works in conjunction with externalpower train devices such as DrMOS, power blocks ordiscrete N-channel MOSFETs and associated gate drivers.Its flexible design enables 1-, 2-, 3-, 4-, 5-, and 6-phaseconfigurations. The LTC7852 offers a unique feature thatenhances the signal-to-noise ratio of the current sensesignal, allowing the use of inductors with very low DCwinding resistances for maximum efficiency. The controllerachieves a minimum on-time of just 40ns, permitting theuse of high switching frequency at high step-down ratios.8-, 10- or 12 phases with two ICs can be paralleled forvery high current requirements up to 400A.

Features

  • Sub-Milliohm DCR Sensing or DrMOS with CurrentSense Improves Efficiency
  • Operates with Power Blocks, DrMOS or External Gate Drivers and MOSFETs
  • ±0.5% Total Output Voltage Accuracy
  • Flexible Phase Configuration
  • Dual Output Current Monitoring
  • tON(MIN) = 40ns, Capable of Very Low Duty Cycles atHigh Frequency
  • Dual Differential Remote Sensing Amplifiers
  • Programmable Frequency Range of 250kHz to 1.2MHz
  • VIN Range Is Not Limited by IC
  • VCC Range: 4.5V to 5.5V
  • VOUT Range: 0.5V to 2.0V
  • 48 Lead (5mm × 6mm) GQFN for LTC7852
  • 36 Lead (4mm × 5mm) QFN for LTC7852-1

Typical applications

  • Telecom and Datacom Systems
  • DC Power Distribution Systems
  • Computer Systems

More information

Parts approved by Analog Devices

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Data­sheet
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Downloads
Status
Product series
VOP(V)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
SamplesAvailability & Sample
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744309025
SPECWE-HCM SMT High Current Flat Wire Inductor, 80 V, 77 A
Simu­lation
Availability
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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
Operating Voltage80 V
Performance Rated Current77 A
Saturation Current @ 10%90 A
Saturation Current @ 30%98 A
DC Resistance0.165 mΩ
Self Resonant Frequency24 MHz
MaterialMnZn 
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