LTC7851

RECOMMENDED FOR NEW DESIGNS

Quad Output, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing

Data Sheet (Rev. A) Product Selection Table
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Overview

  • Operates with Power Blocks, DrMOS or External Gate Drivers and MOSFETs
  • Voltage Mode Control with Accurate Current Sharing
  • ±0.75% 0.6V Voltage Reference
  • Quad Differential Output Voltage Sense Amplifiers
  • Multiphase Capability
  • Phase-Lockable Fixed Frequency 250kHz to 2.25MHz
  • Lossless Current Sensing Using Inductor DCR or Precision Current Sensing with Sense Resistor or DrMOS with Integrated Current Sensing
  • VCC Range: 3V to 5.5V
  • VOUT Range: 0.6V to VCC – 0.5V
  • Power Good Output Voltage Monitor
  • Output Voltage Tracking Capability with Soft-Start
  • Available in 58-Lead 5mm × 9mm QFN Package

The LTC7851/LTC7851-1 are quad output multiphase synchronous step-down switching regulator controllers that employ a constant frequency voltage mode architecture. They maintain excellent current balance between channels when paralleled with their internal current sharing loop. Lossless DCR or a low value RSENSE is used for output current sensing. Multiple LTC7851/LTC7851-1 devices can be used for high phase count operation.

A very low offset, high bandwidth error amplifier, combined with remote output voltage sensing, provides excellent transient response and output regulation. The LTC7851/ LTC7851-1 operates with a VCC supply voltage from 3V to 5.5V and is designed for step-down conversion with VIN from 3V to 27V and produces an output voltage from 0.6V to VCC – 0.5V.

The LTC7851-1 is identical to the LTC7851 except it has a lower current sense amplifier gain, making it ideal for DrMOS devices with internal current sense.

Applications

  • High Current Distributed Power Systems
  • DSP, FPGA and ASIC Supplies
  • Datacom, Telecom and Computing Systems
LTC7851
Quad Output, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing
LTC7851 Application Circuit LTC7851 Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

Design Note 1

Technical Articles 2

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2975
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Input Current and Energy Measurement
Protection Switches & Controllers 1
LTC4370
RECOMMENDED FOR NEW DESIGNS Two-Supply Diode-OR Current Balancing Controller
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC7851
  • LTC7851-1

LTpowerCAD 2

Design tools for the following parts are available in LTpowerCAD:

  • LTC7851
  • LTC7851-1
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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
DC2380A-C

LTC7851EUHH Demo Board | Single Output, 4-Phase Voltage Mode Buck Controller, 7V ≤ VIN ≤ 14V; VOUT1 = 1.2V @ 120A

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Product Details

Demonstration circuit DC2380A features the LTC7851, a high performance 4-phase step-down, voltage mode controller. The DC2380A-C operates with a 7V to 14V input supply voltage and provides a single 1.2V @ 120A output. The LTC7851’s integrated current share circuit provides highly accurate current sharing. Since the LTC7851 does not include MOSFET drivers, its PWM outputs drive external DrMOS devices.

eval board
schematic 5
schematic 6
schematic 7
schematic 8
DC2380A-A

LTC7851EUHH Demo Board | 4-Phase Voltage Mode Buck Controller, 7V ≤ VIN ≤ 14V; VOUT1 = 1.8V @ 30A, VOUT2 = 1.5V @ 30A, VOUT3 = 1.2V @ 30A, VOUT4 = 1V @ 30A

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Product Details

Demonstration circuit DC2380A features the LTC7851, a high performance 4-phase step-down, voltage mode controller. The DC2380A-A operates with a 7V to 14V input supply voltage and provides the follow four high current outputs: 1.8V @ 30A, 1.5V @ 30A, 1.2V @ 30A and 1.0V @ 30A. Since the LTC7851 does not include MOSFET drivers, its PWM outputs drive external DrMOS devices.

eval board
schematic 9
schematic 10
schematic 11
schematic 12
DC2380A-B

LTC7851EUHH Demo Board | Dual Output, 4-Phase Voltage Mode Buck Controller, 7V ≤ VIN ≤ 14V; VOUT1 = 1.8V @ 60A, VOUT3 = 1.2V @ 60A

Buy Now View Details

Product Details

Demonstration circuit DC2380A features the LTC7851, a high performance 4-phase step-down, voltage mode controller. The DC2380A-B operates with a 7V to 14V input supply voltage and provides the follow two high current outputs: 1.8V @ 60A and 1.2V @ 60A. The LTC7851’s integrated current share circuit provides highly accurate current sharing. Since the LTC7851 does not include MOSFET drivers, its PWM outputs drive external DrMOS devices.
DC2380A-C
LTC7851EUHH Demo Board | Single Output, 4-Phase Voltage Mode Buck Controller, 7V ≤ VIN ≤ 14V; VOUT1 = 1.2V @ 120A
DC2380A-A DC2380A-A DC2380A-A DC2380A-C - Schematic
DC2380A-A
LTC7851EUHH Demo Board | 4-Phase Voltage Mode Buck Controller, 7V ≤ VIN ≤ 14V; VOUT1 = 1.8V @ 30A, VOUT2 = 1.5V @ 30A, VOUT3 = 1.2V @ 30A, VOUT4 = 1V @ 30A
DC2380A-A DC2380A-A DC2380A-A DC2380A-A - Schematic
DC2380A-B
LTC7851EUHH Demo Board | Dual Output, 4-Phase Voltage Mode Buck Controller, 7V ≤ VIN ≤ 14V; VOUT1 = 1.8V @ 60A, VOUT3 = 1.2V @ 60A
DC2380A-A DC2380A-A DC2380A-A DC2380A-B - Schematic

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