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MAX20029B

MAX20029B

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

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Overview

Description

The MAX20029/MAX20029B/MAX20029C 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 0.7V to 4.0V. The MAX20029 has four 1.5A channels, while the MAX20029B has two 1.5A/3.0A channels and MAX20029C has four 1.5A channels with low VOUT down to 0.7V. The PMICs operate from 3.0V to 5.5V, making them ideal for automotive point-of-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 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
  • 1.0V to 4.0V Fixed or Adjustable Output Voltage
  • 2.2MHz Switching Frequency
  • MAX20029: Up to Four 1.5A Channels
  • MAX20029B: Up to One 3A + Two 1.5A Channels
  • MAX20029C: Up to Four 1.5A Channels with low 0.7V VOUT
  • 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

Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		Preset VOUT
(V)		Output Adjust. MethodIOUT1
(A)		Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)		Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX20029 35.514100mV steps
Preset
Resistor
1.5InternalYesYes42200EE-Sim
TQFN/28
$1.37 @1k
MAX20029B 1433
TQFN/28
MAX20029C 0.73.81.54
TQFN/28
See All Step-Down Switching Regulators (389)
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


MAX20029CEVKIT: Evaluation Kit for the MAX20029/MAX20029C
MAX20029EVKIT: Evaluation Kit for the MAX20029/MAX20029C

Quality and Environmental Data

Request Reliability Report for: MAX20029B 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • EE-Sim: Design & Simulate MAX20029B

    • Quality And Environmental

    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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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    Tools & Models

    Reference Designs

    Type ID Title
    Evaluation Board10275MAX20029CEVKIT Evaluation Kit for the MAX20029/MAX20029C
    Evaluation Board10275MAX20029EVKIT Evaluation Kit for the MAX20029/MAX20029C