Overview

Features and Benefits

  • Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • Tracking for Both Outputs
  • Constant Frequency Current Mode Control
  • Wide VIN Range: 4.5V to 28V Operation
  • Power Good Output Voltage Indicator
  • Adjustable Soft-Start Current Ramping
  • Foldback Output Current Limiting-Disabled at Start-Up
  • No Reverse Current During Soft-Start Interval
  • Clock Output for 3-, 4-, 6-Phase Operation
  • Dual N-Channel MOSFET Synchronous Drive
  • ±1% Output Voltage Accuracy
  • Phase-Lockable Fixed Frequency 260kHz to 550kHz
  • OPTI-LOOP® Compensation Minimizes COUT
  • Very Low Dropout Operation: 99% Duty Cycle
  • Output Overvoltage Protection
  • Small 28-Lead SSOP and 5mm × 5mm QFN Packages

Product Details

The LTC3828 is a dual high performance step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows for a phase-lockable frequency of up to 550kHz. The TRCKSS pin provides both soft-start and tracking functions. Multiple LTC3828s can be daisy-chained in applications requiring more than two voltages to be tracked.

OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are compatible with a wide 4.5V to 28V (30V maximum) input supply range, encompassing all battery chemistries.

The RUN pins control their respective channels independently. The FCB/PLLIN pin selects among Burst Mode® operation, skip-cycle mode and continuous current mode. Current foldback limits MOSFET dissipation during short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start.

Applications

  • Telecom Infrastructure
  • ASIC Power Supply
  • Industry Equipment

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (3)

Tools & Simulations

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.

LTspice

Models for the following parts are available in LTspice:

LTC3828

Product Recommendations

LTC3828 Companion Parts

Recommended Related Parts

Recommended Suggested Oscillator

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.