MAX15023

PRODUCTION

Wide 4.5V to 28V Input, Dual-Output Synchronous Buck Controller

Low-Cost, Dual DC-DC Controller Operates from 4.5V to 28V Suitable for Multiple Applications

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • 5.5V to 28V or 5V ±10% Input Supply Range
  • 0.6V to (0.85 x VIN) Adjustable Outputs
  • Adjustable 200kHz to 1MHz Switching Frequency
  • Guaranteed Monotonic Startup into a Prebiased Load
  • Lossless, Cycle-by-Cycle, Low-Side, Source Peak Current Limit with Adjustable, Temperature-Compensated Threshold
  • Cycle-by-Cycle, Low-Side, Sink Peak Current-Limit Protection
  • Proprietary Adaptive Internal Digital Soft-Start
  • ±1% Accurate Voltage Reference
  • Internal Boost Diodes
  • Adaptive Synchronous Rectification Eliminates External Freewheeling Schottky Diodes
  • Hiccup-Mode Short-Circuit Protection and Thermal Shutdown
  • Power-Good Outputs and Analog Enable Inputs for Power Sequencing

The MAX15023 dual, synchronous step-down controller operates from a 5.5V to 28V or 5V ±10% input voltage range and generates two independent output voltages. Each output is adjustable from 85% of the input voltage down to 0.6V and supports loads of 12A or higher. Input voltage ripple and total RMS input ripple current are reduced by interleaved 180° out-of-phase operation.

The MAX15023 offers the ability to adjust the switching frequency from 200kHz to 1MHz with an external resistor. The MAX15023's adaptive synchronous rectification eliminates the need for external freewheeling Schottky diodes. The device also utilizes the external low-side MOSFET's on-resistance as a current-sense element, eliminating the need for a current-sense resistor. This protects the DC-DC components from damage during output overloaded conditions or output short-circuit faults without requiring a current-sense resistor. Hiccup-mode current limit reduces power dissipation during short-circuit conditions. The MAX15023 includes two independent power-good outputs and two independent enable inputs with precise turn-on/turn-off thresholds, which can be used for supply monitoring and for power sequencing.

Additional protection features include cycle-by-cycle, low-side, sink peak current limit, and thermal shutdown. Cycle-by-cycle, low-side, sink peak current limit prevents reverse inductor current from reaching dangerous levels when the device is sinking current from the output. The MAX15023 also allows prebiased startup without discharging the output and features adaptive internal digital soft-start. This new proprietary feature enables monotonic charging of externally large output capacitors at startup, and achieves good control of the peak inductor current during hiccup-mode short-circuit protection.

The MAX15023 is available in a space-saving and thermally enhanced 4mm x 4mm, 24-pin TQFN-EP package. The device operates over the -40°C to +85°C extended temperature range.

Applications

  • DSP Power Supplies
  • LCD TV Secondary Supplies
  • Point-of-Load Regulators
  • Power Modules
  • Set-Top Boxes
  • Switches/Routers
MAX15023
Wide 4.5V to 28V Input, Dual-Output Synchronous Buck Controller
MAX15023: Typical Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 3

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 1
MAX8546
PRODUCTION Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit
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Tools & Simulations

EE-Sim Power® Tools 1

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.

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SIMPLIS Models 1

Evaluation Kits

MAX15023EVKIT

Evaluation Kit for the MAX15023

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Features and Benefits

  • 9V to 16V Input Range
  • Optional 4.5V to 5.5V Input Range for MAX15023
  • 1.2V/10A (VOUT1)
  • 3.3V/5A (VOUT2)
  • 500kHz Switching Frequency
  • Independent Enable Inputs
  • Independent Power-Good Outputs
  • Configurable for Power-Supply Sequencing Operation
  • Lead-Free and RoHS Compliant
  • Fully Assembled and Tested

Product Details

The MAX15023 evaluation kit (EV kit) is a fully assembled and tested PCB that contains all the components necessary to evaluate the performance of the MAX15023 dual, synchronous step-down controller.

The MAX15023 EV kit requires a 9V to 16V DC power supply, which provides up to 5A for normal operation. The EV kit provides 1.2V/10A and 3.3V/5A at the outputs. Each step-down controller operates 180° out-of-phase to reduce input-voltage ripple and total RMS input ripple current.

The converters' switching frequency is programmed to 500kHz. The EV kit includes individual enable control PCB pads for each converter and power-good outputs for both converters that can be configured for power-supply sequencing of the outputs.

Applications

  • DSP Power Supplies
  • LCD TV Secondary Supplies
  • Point-of-Load Regulators
  • Power Modules
  • Set-Top Boxes
  • Switches/Routers
MAX15023EVKIT
Evaluation Kit for the MAX15023

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