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MAX15021

MAX15021

Dual, 4A/2A, 4MHz, Step-Down DC-DC Regulator with Tracking/Sequencing Capability

4MHz, Dual Synchronous Regulator Delivers 4A/2A in a Small 5mm × 5mm Package

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Overview

Description

The MAX15021 is a dual-output, pulse-width-modulated (PWM), step-down DC-DC regulator with tracking (coincident and ratiometric) and sequencing options. The device operates from 2.5V to 5.5V and each output can be adjusted from 0.6V to the input supply (VAVIN). The MAX15021 delivers up to 4A (regulator 1) and 2A (regulator 2) of output current. This device offers the ability to adjust the switching frequency from 500kHz to 4MHz and provides the capability of optimizing the design in terms of size and performance.

The MAX15021 utilizes a voltage-mode control scheme with external compensation to provide good noise immunity and maximum flexibility in selecting inductor values and capacitor types. The dual switching regulators operate 180° out-of-phase, thereby reducing the RMS input ripple current and thus the size of the input bypass capacitor significantly.

The MAX15021 offers the ability to track (coincident or ratiometric) or sequence during power-up and powerdown operation. When sequencing, it powers up glitch-free into a prebiased output.

Additional features include an internal undervoltage lockout with hysteresis and a digital soft start/soft-stop for glitch-free power-up and power-down. Protection features include lossless cycle-by-cycle current limit, hiccup-mode output short-circuit protection, and thermal shutdown.

The MAX15021 is available in a space-saving, 5mm x 5mm, 28-pin TQFN-EP package and is specified for operation from -40°C to +125°C temperature range.
MAX15021: Typical Operating Circuit MAX15021: Typical Operating Circuit Enlarge+

Key Features

  • Integration Reduces Power-Supply Footprint for Space-Constrained Designs
    • Dual-Output Synchronous Buck Regulators
    • Integrated Switches for 4A and 2A Output Currents
    • Programmable Switching Frequency from 500kHz to 4MHz
    • 28-Pin TQFN Package (5mm x 5mm)
    • 180° Out-Of-Phase Operation Reduces Input Ripple Current and Thus the Size of the Input Bypass Capacitors
  • Sophisticated Tracking/Sequencing Functions Facilitate Reliable Processor Operation
    • Digital Soft-Start and Soft-Stop for Tracking Applications
    • Digital Soft-Start into a Prebiased Load for Sequencing Applications
    • Sequencing or Coincident/Ratiometric Tracking
  • Flexible Enough for Use in a Range of Designs
    • 2.5V to 5.5V Input Voltage Range
    • Output-Voltage Adjustable from 0.6V to VAVIN
    • External Compensation for Maximum Flexibility
    • 100% Maximum Duty Cycle
  • Integrated Protection Features Save Space and Increase Reliability
    • Lossless, Cycle-by-Cycle Current Sensing
    • Thermal Shutdown and Hiccup-Mode Short-Circuit Protection
  • 20µA Shutdown Current Extends Battery Life in Portable Applications

Applications/Uses

  • Automotive Multimedia
  • Multivoltage Supplies
  • Networking/Telecom
  • Power-Over-Ethernet (PoE) IP Phones
  • RFID Reader Cards

Parametric Specs

See parametric specs for Step-Down Switching Regulators (405)


Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		Output Adjust. MethodIOUT1
(A)		Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)		Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX15021 2.55.50.65.5Resistor4InternalYes24000EE-Sim
TQFN/28
$3.86 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Technical Documents

User Guide 5861 EE-SIM Design and Simulation Environment User Guide
Tutorial 5133 Power-Supply Solutions for Altera FPGAs
Tutorial 5132 Power-Supply Solutions for Xilinx FPGAs
Tutorial 4698 Introduction to Dialysis Machines
Tutorial 4677 Important Considerations for Infusion Pump and Portable Medical Designs

Tools & Models

  • EE-Sim: Design & Simulate MAX15021
  • MAX15021 SIMPLIS Schematic

    •

    Quality And Environmental

    Product Reliability Reports: MAX15021.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

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