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Triple-Output Buck Controllers with Tracking/Sequencing

Low-Cost Triple Buck Controllers with Sequencing and Tracking in Small Form Factor (5mm x 5mm)

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • 4.7V to 23V or 5V ±10% Input Voltage Range
  • Triple-Output Synchronous Buck Controllers with 120° Out-of-Phase Operation
  • Prebias Power-Up (MAX15049)
  • Output Voltage Adjustable Down to 0.6V
  • Coincident/Ratiometric Tracking (MAX15048)
  • Accurate Sequencing Through Enable Threshold (MAX15049)
  • External Compensation for Maximum Flexibility
  • Digital Soft-Start (MAX15048/MAX15049) and Soft-Stop (MAX15048)
  • Lossless Valley-Mode Current Sensing Using RDS(ON) of the Low-Side MOSFET
  • PGOOD Output
  • Integrated Bootstrap Diodes
  • Programmable Switching Frequency from 200kHz to 1.2MHz
  • Thermal Shutdown and Hiccup Mode Short-Circuit Protection
  • Space-Saving (5mm x 5mm), 32-Pin TQFN Package

Applications/Uses

  • ASIC/CPU/DSP Core and I/O Voltages
  • Base-Station Power Supplies
  • DDR Power Supply
  • Point-of-Load DC-DC Converters
  • RAID Control Power Supplies
  • Set-Top Boxes
  • Telecom and Networking Power Supplies

Description

The MAX15048/MAX15049 are triple-output pulse-width modulated (PWM), step-down, DC-DC controllers with tracking (MAX15048) and sequencing (MAX15049) options. The devices operate over the 4.7V to 23V input-voltage range. Each PWM controller provides an adjustable output down to 0.6V and delivers up to 15A of load current with excellent load and line regulation. The MAX15049 can start into prebiased outputs. The MAX15048/MAX15049 are optimized for high-performance, small-size power-management solutions.

The options of coincident or ratiometric tracking (MAX15048) or output sequencing (MAX15049) allow the tailoring of the power-up/power-down sequence depending on the system requirements. Each of the MAX15048/MAX15049 PWM sections utilizes a voltage-mode control scheme with external compensation, allowing for good noise immunity and maximum flexibility with a wide selection of inductor values and capacitor types. Each PWM section operates at the same fixed switching frequency that is programmable from 200kHz to 1.2MHz. Each converter, operating at up to 1.2MHz with 120° out-of-phase, increases the input capacitor ripple frequency up to 3.6MHz, reducing the RMS input ripple current and thus the size of the input bypass capacitor significantly. The MAX15048/MAX15049 integrate boost diodes for additional system cost savings.

The MAX15048/MAX15049 include internal undervoltage lockout (UVLO) with hysteresis and digital soft-start (MAX15048/MAX15049)/soft-stop (MAX15048) for glitch-free power-up and power-down of the converter. The power-good circuitry (PGOOD) monitors all three outputs and provides a power-good signal to the system control/processor when all outputs are within regulation. Protection features include lossless valley-mode current limit, hiccup mode output short-circuit protection, and thermal shutdown.

The MAX15048/MAX15049 are available in space-saving, 5mm x 5mm, lead-free, 32-pin TQFN-EP packages and are specified for operation over the -40°C to +85°C extended temperature range.

Simplified Block Diagram

MAX15048, MAX15049: Simplified Typical Operating Circuit (Coincident Tracking) MAX15048, MAX15049: Simplified Typical Operating Circuit (Coincident Tracking) Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .