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Automotive Quad/Triple/Quad Low-Voltage Step-Down DC-DC Converters

Four Integrated Power Rails and High Operating Frequency Minimize Solution Size for Multirail Point-of-Load Regulation

Product Details

The MAX20029/MAX20029B/MAX20029C/MAX20029D power-management ICs (PMICs) integrate four low-voltage, high-efficiency, step-down DC-DC converters. Each of the four outputs is factory or resistor programmable between 1V to 4.0V (MAX20029/MAX20029B) or 0.7V to 3.8V (MAX20029C/MAX20029D). The MAX20029/ MAX20029C has two 0.5A/1A/1.5A channels and two 0.5A/1.5A channels, while the MAX20029B/MAX20029D has two 0.5A/1.5A channels and by combining channels 1 and 2, a single 2A/3A channel. The PMICs operate from 3.0V to 5.5V, making them ideal for automotive point-off-load and post-regulation applications.

The PMICs feature fixed-frequency PWM-mode operation with a switching frequency of 2.2MHz. High-frequency operation allows for an all-ceramic capacitor design and small-size external components. The low-resistance on-chip switches ensure high efficiency at heavy loads while minimizing critical inductances, making the layout a much simpler task with respect to discrete solutions. Internal current sensing and loop compensation reduce board space and system cost.

The PMICs offer a spread-spectrum option to reduce radiated emissions. Two of the four buck converters operate 180° out-of-phase with the internal clock. This feature reduces the necessary input capacitance and improves EMI as well. All four buck converters operate in constant PWM mode outside the AM band. The PMICs offer a SYNC input to synchronize to an external clock.

The PMICs provide individual enable inputs and power-good/reset outputs, as well as factory-programmable PG times.

The PMICs offer several important protection features including: input overvoltage protection, input undervoltage lockout, cycle-by-cycle current limiting, and overtemperature shutdown.

The MAX20029/MAX20029B/MAX20029C//MAX20029D PMICs are available in a 28-pin TQFN package with an exposed pad and are specified for operation over the -40°C to +125°C automotive temperature range.

Key Features

  • Quad Step-Down DC-DC Converters with Integrated FETs
  • Operate from 3.0V to 5.5V Supply Voltage
  • 0.7V to 4.0V Fixed or Adjustable Output Voltage
  • 2.2MHz Switching Frequency
  • MAX20029/MAX20029C: Up to Four 1.5A Channels
  • MAX20029B/MAX20029D: Up to One 3A + Two 1.5A Channels
  • Designed to Improve Automotive EMI Performance
    • Forced-PWM Operation
    • Two Channels 180° Out-of-Phase
    • SYNC Input
    • Spread-Spectrum Option
  • Soft-Start and Supply Sequencing Reduces Inrush Current
  • Individual Enable Inputs and Power-Good Outputs to Simplify Sequencing
  • OV Input-Voltage Monitoring
  • Overtemperature and Short-Circuit Protection
  • 28-Pin (5mm × 5mm x 0.8mm) TQFN-EP Package
  • -40°C to +125°C Operating Temperature Range

    Applications/Uses

    • Automotive
    • Industrial
    Parametric specs for Step-Down Switching Regulators
    VIN (V) (min) 3
    VIN (V) (max) 5.5
    VOUT1 (V) (min) 1
    VOUT1 (V) (max) 4
    IOUT1 (A) (max) 3
    Switch Type Internal
    Preset VOUT (V) 100mV steps
    Output Adjust. Method Preset
    Resistor
    Synchronous Switching? Yes
    Power Good Signal Yes
    # DC-DC Outputs 3
    Switching Frequency (kHz) 2200
    Design Tools EE-Sim
    Package/Pins TQFN/28
    Budgetary
    Price (See Notes)
    $1.37 @1k
    View More

    Simplified Block Diagram

    MAX20029, MAX20029B, MAX20029C, MAX20029D: Simplified Block Diagram MAX20029, MAX20029B, MAX20029C, MAX20029D: Simplified Block Diagram Zoom icon

    Technical Docs

    Design & Development

    Click any title below to view the detail page where available.

    Description

    The MAX20029B EV kit is a fully assembled and tested PCB that demonstrates the capabilities of the MAX20029B power-management IC (PMIC), which comprises four low-voltage step-down converters. The IC operates at a 3V to 5.5V input supply voltage, regulates to a 1V to 4V voltage range, and delivers up to 3A of current, while OUT3 and and OUT4 deliver up to 1.5A. The converters are high-frequency switchers, operating at 2.2MHz. The high switching frequency allows for reduced component values and sizes, including a single ceramic output capacitor on each rail. All channels have independent undervoltage/overvoltage comparators at both input and output, current limiting, and fault-flag outputs. The EV kit ships fully assembled and tested, ready for immediate evaluation of the IC.

    View Details

    Features

    • 3.0V to 5.5V Input Voltage Range
    • 1.0V to 4.0V Output Voltage Range
      • Resistive Dividers Used to Set Appropriate Output Voltage
    • High Switching Frequency of 2.2MHz
      • Two Channels Operate 180° Out-of-Phase
    • Individual Enable and Reset Connections Available
    • Loop Measurements Ready on All Channels
    • Overtemperature and Short-Circuit Protection
    • Proven PCB Layout
    • Fully Assembled and Tested

    Description

    The MAX20029 EV kit is a fully assembled and tested PCB that demonstrates the capabilities of the MAX20029 power-management IC (PMIC), which comprises four low-voltage step-down converters. The IC operates at a 3V to 5.5V input supply voltage, regulates to a 1V to 4V voltage range, and delivers up to 1.5A of current at each of its outputs. The converters are high-frequency switchers, operating at 2.2MHz. The high switching frequency allows for reduced component values and sizes, including a single ceramic output capacitor on each rail. All channels have independent undervoltage/overvoltage comparators at both input and output, current limiting, and fault-flag outputs. The EV kit ships fully assembled and tested, ready for immediate evaluation of the IC.

    View Details

    Features

    • 3.0V to 5.5V Input Voltage Range
    • 1.0V to 4.0V Output Voltages Range
      • Resistive Dividers Used to Set Appropriate Output Voltage
    • High Switching Frequency of 2.2MHz
      • Two Channels Operate 180° Out-of-Phase
    • Individual Enable and Reset Connections Available
    • Loop Measurements Ready on All Channels
    • Overtemperature and Short-Circuit Protection
    • Proven PCB Layout
    • Fully Assembled and Tested

    Description

    The MAX20029 EV kit is a fully assembled and tested PCB that demonstrates the capabilities of the MAX20029 power-management IC (PMIC), which comprises four low-voltage step-down converters. The IC operates at a 3V to 5.5V input supply voltage, regulates to a 1V to 4V voltage range, and delivers up to 1.5A of current at each of its outputs. The converters are high-frequency switchers, operating at 2.2MHz. The high switching frequency allows for reduced component values and sizes, including a single ceramic output capacitor on each rail. All channels have independent undervoltage/overvoltage comparators at both input and output, current limiting, and fault-flag outputs. The EV kit ships fully assembled and tested, ready for immediate evaluation of the IC.

    View Details

    Features

    • 3.0V to 5.5V Input Voltage Range
    • 1.0V to 4.0V Output Voltages Range
      • Resistive Dividers Used to Set Appropriate Output Voltage
    • High Switching Frequency of 2.2MHz
      • Two Channels Operate 180° Out-of-Phase
    • Individual Enable and Reset Connections Available
    • Loop Measurements Ready on All Channels
    • Overtemperature and Short-Circuit Protection
    • Proven PCB Layout
    • Fully Assembled and Tested

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    Parameters

    Parametric specs for Step-Down Switching Regulators
    VIN (V) (min) 3
    VIN (V) (max) 5.5
    VOUT1 (V) (min) 1
    VOUT1 (V) (max) 4
    IOUT1 (A) (max) 3
    Switch Type Internal
    Preset VOUT (V) 100mV steps
    Output Adjust. Method Preset
    Resistor
    Synchronous Switching? Yes
    Power Good Signal Yes
    # DC-DC Outputs 3
    Switching Frequency (kHz) 2200
    Design Tools EE-Sim
    Package/Pins TQFN/28
    Budgetary
    Price (See Notes)
    $1.37 @1k

    Key Features

    • Quad Step-Down DC-DC Converters with Integrated FETs
    • Operate from 3.0V to 5.5V Supply Voltage
    • 0.7V to 4.0V Fixed or Adjustable Output Voltage
    • 2.2MHz Switching Frequency
    • MAX20029/MAX20029C: Up to Four 1.5A Channels
    • MAX20029B/MAX20029D: Up to One 3A + Two 1.5A Channels
    • Designed to Improve Automotive EMI Performance
      • Forced-PWM Operation
      • Two Channels 180° Out-of-Phase
      • SYNC Input
      • Spread-Spectrum Option
    • Soft-Start and Supply Sequencing Reduces Inrush Current
    • Individual Enable Inputs and Power-Good Outputs to Simplify Sequencing
    • OV Input-Voltage Monitoring
    • Overtemperature and Short-Circuit Protection
    • 28-Pin (5mm × 5mm x 0.8mm) TQFN-EP Package
    • -40°C to +125°C Operating Temperature Range

      Applications/Uses

      • Automotive
      • Industrial

      Description

      The MAX20029/MAX20029B/MAX20029C/MAX20029D power-management ICs (PMICs) integrate four low-voltage, high-efficiency, step-down DC-DC converters. Each of the four outputs is factory or resistor programmable between 1V to 4.0V (MAX20029/MAX20029B) or 0.7V to 3.8V (MAX20029C/MAX20029D). The MAX20029/ MAX20029C has two 0.5A/1A/1.5A channels and two 0.5A/1.5A channels, while the MAX20029B/MAX20029D has two 0.5A/1.5A channels and by combining channels 1 and 2, a single 2A/3A channel. The PMICs operate from 3.0V to 5.5V, making them ideal for automotive point-off-load and post-regulation applications.

      The PMICs feature fixed-frequency PWM-mode operation with a switching frequency of 2.2MHz. High-frequency operation allows for an all-ceramic capacitor design and small-size external components. The low-resistance on-chip switches ensure high efficiency at heavy loads while minimizing critical inductances, making the layout a much simpler task with respect to discrete solutions. Internal current sensing and loop compensation reduce board space and system cost.

      The PMICs offer a spread-spectrum option to reduce radiated emissions. Two of the four buck converters operate 180° out-of-phase with the internal clock. This feature reduces the necessary input capacitance and improves EMI as well. All four buck converters operate in constant PWM mode outside the AM band. The PMICs offer a SYNC input to synchronize to an external clock.

      The PMICs provide individual enable inputs and power-good/reset outputs, as well as factory-programmable PG times.

      The PMICs offer several important protection features including: input overvoltage protection, input undervoltage lockout, cycle-by-cycle current limiting, and overtemperature shutdown.

      The MAX20029/MAX20029B/MAX20029C//MAX20029D PMICs are available in a 28-pin TQFN package with an exposed pad and are specified for operation over the -40°C to +125°C automotive temperature range.

      Simplified Block Diagram

      MAX20029, MAX20029B, MAX20029C, MAX20029D: Simplified Block Diagram MAX20029, MAX20029B, MAX20029C, MAX20029D: Simplified Block Diagram 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