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reference designLTC7852

Analog Devices LTC7852

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

Overview

TopologyBuck Converter
Input voltage5-13 V
Switching frequency250-1200 kHz
Output 11.2 V / 60 A
Output 21 V / 200 A
Output 30.9 V / 120 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 LTC7852-1Sub-Milliohm DCR Sensing or DrMOS with CurrentSense Improves Efficiencynn Operates with Power Blocks, DrMOS or ExternalGate Drivers and MOSFETsnn ±0.5% Total Output Voltage Accuracynn Flexible Phase Configurationnn Dual Output Current Monitoringnn tON(MIN) = 40ns, Capable of Very Low Duty Cycles atHigh Frequency

Typical applications

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

More information

Parts approved by Analog Devices

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Order Code
Data­sheet
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Product series
L(nH)
LR(nH)
IR(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
SamplesAvailability & Sample
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744301025
SPECWE-HCM SMT High Current Flat Wire Inductor, 250 nH, 250 nH

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

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Downloads9 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
Inductance250 nH
Rated Inductance250 nH
Rated Current38 A
Saturation Current @ 10%54.4 A
Saturation Current @ 30%64.7 A
DC Resistance0.32 mΩ
Self Resonant Frequency33 MHz
MaterialMnZn 
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