LTC7852
LTC7852-1

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

Data Sheet (Rev. B) Product Selection Table
Part Models
8
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Part Details

  • Sub-Milliohm DCR Sensing or DrMOS with Current Sense 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 at High 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
LTC7852
LTC7852-1
Dual Output, 6-Phase, Multiphase Current Mode Synchronous Controller with Current Monitoring
LTC7852/LTC7852-1 Application Circuit Diagram LTC7852/LTC7852-1 Pin Configuration Diagram LTC7852/LTC7852-1 Pin Configuration Diagram
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC7852
  • LTC7852-1
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC2631A

  LTC7852 Demo Board | Single or Dual Output 

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Product Details

Demonstration circuit 2631A features the LTC7852 in two high output current, high efficiency step down converters each with its own assembly type. The converter for the –A assembly provides two 3-phase outputs of 1.0V / 100A & 1.5V/100A. The –B assembly provides a single 6-phase 1.0V/200A output. Block diagrams are shown in Figure 3. Both converters operate over a 7V to 14V input voltage range at a switching frequency of 400kHz.

The power stage for each phase consists of a 5mm × 5mm DrMOS and 11.3mm × 11.0mm 0.25µH ferrite inductor with a DCR of 0.32mΩ typical. The LTC7852 employs a peak current mode architecture which allows accurate DCR sensing and sharing with sub-mOhm DCR inductors. The LTC7852 provides a three-state compatible PWM output for each DrMOS. 

Additional features of the DC2631A include:

  • Differential sensing for the output voltages of VOUT1 and VOUT2
  • IMON pins to monitor the inductor current of each rail.
  • Optional resistors and jumpers to change the phase arrangement for VOUT1 & VOUT2:
    • VOUT1: 4ph, VOUT2: 2ph
    • VOUT1: 5ph, VOUT2: 1ph
    • Note, the default arrangement is: VOUT1: 3ph, VOUT2: 3ph
  • Optional resistors and jumpers to parallel VOUT1 & VOUT2.
  • RUN, PGOOD, PLLIN and CLKOUT pins
The LTC7852 data sheet provides a complete description of the IC operation and application information. The data sheet must be read in conjunction with the quick start guide. 

DC2631A
  LTC7852 Demo Board | Single or Dual Output 
DC2631A-B Evaluation Board DC2631A-B Evaluation Board - Top View DC2631A-B Evaluation Board - Bottom View DC2631A-A-2631A-B Application Circuit DC2631A-A-2631A-B Application Circuit

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