LTC3860 - Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing

Features

  • Operates with Power Blocks, DRMOS or External Gate Drivers and MOSFETs
  • Constant Frequency Voltage Mode Control with Accurate Current Sharing
  • ±0.75% 0.6V Voltage Reference
  • Differential Remote Output Voltage Sense Amplifier
  • Multiphase Capability—Up to 12-Phase Operation
  • Programmable Current Limit
  • Safely Powers a Pre-Biased Load
  • Programmable or PLL-Synchronizable Switching Frequency Up to 1.25MHz
  • Lossless Current Sensing Using Inductor DCR or Precision Current Sensing with Sense Resistor
  • VCC Range: 3V to 5.5V
  • VIN Range: 3V to 24V
  • Power Good Output Voltage Monitor
  • Output Voltage Tracking Capability
  • Programmable Soft-Start
  • Available in a 32- Pin 5mm × 5mm QFN Package

Typical Application

LTC3860
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Description

The LTC3860 is a dual, PolyPhase synchronous stepdown switching regulator controller for high current distributed power systems, digital signal processors, and other telecom and industrial DC/DC power supplies. It uses a constant frequency voltage mode architecture combined with very low offset, high bandwidth error amplifiers and a remote output sense differential amplifier for excellent transient response and output regulation.

The controller incorporates lossless inductor DCR current sensing to maintain current balance between phases and to provide overcurrent protection. The chip operates from a VCC supply between 3V and 5.5V and is designed for stepdown conversion from VIN between 3V and 24V to output voltages between 0.6V and VCC – 0.5V.

The TRACK/SS pins provide programmable soft-start or tracking functions. Inductor current reversal is disabled during soft-start to safely power prebiased loads. The constant operating frequency can be synchronized to an external clock or linearly programmed from 250kHz to 1.25MHz. Up to six LTC3860 controllers can operate in parallel for 1-, 2-, 3-, 4-, 6- or 12-phase operation.

The LTC3860 is available in a 32-pin 5mm × 5mm QFN package.

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Packaging

QFN-32

LTC3860
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3860EUH#PBF QFN 32 E $3.70 $2.59 View
LTC3860EUH#TRPBF QFN 32 E   $2.65 View
LTC3860IUH#PBF QFN 32 I $4.26 $2.98 View
LTC3860IUH#TRPBF QFN 32 I   $3.04 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

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Applications

  • High Current Distributed Power Systems
  • Digital Signal Processor and ASIC Supplies
  • Telecom Systems
  • Industrial Power Supplies
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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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ISL6558 ZL2004 PX7510