Features and Benefits
- High-Efficiency Voltage DC-DC Controller Saves Power
- 3.5V to 36V Operating Supply Voltage
- Output Voltage: Pin Selectable, Fixed, or Resistor-Divider Adjustable
- 350kHz to 2.1MHz Operation
- 30µA Quiescent Current with DC-DC Controller Enabled
- Dual 2.1MHz DC-DC Converters with Integrated FETs Saves Space
- OUT2 and OUT3 Are Cascaded from OUT1, Improving Efficiency
- 3A Output Current
- 0.8V to 3.95V Output Voltage
- 25% Lower COUT2 and COUT3 Compared to the MAX16993
- Fixed or Resistor-Divider-Adjustable Output Voltage
- 180° Out-of-Phase Operation
- High Accuracy to Meet ASIL Specification
- ±1% FB Accuracy, ±2% Output-Voltage Accuracy, and ±0.5% OV/UV Accuracy
- Excellent Load-Transient Performance
- Robust for the Automotive Environment
- Current-Mode Architecture with Forced-PWM and Skip Modes of Operations
- Frequency Synchronization Input/Output Reduces System Noise
- Individual Enable Inputs and Active-Low RESET1 Outputs
- Overtemperature and Short-Circuit Protection
- AECQ-100 Qualified
The MAX20028 power-management integrated circuit (PMIC) is a 2.1MHz, multichannel, DC-DC converter designed for automotive applications. The device integrates three supplies in a small footprint. The device includes one high-voltage step-down controller (OUT1) designed to run directly from a car battery, and two low-voltage step-down converters (OUT2/OUT3) cascaded from OUT1. Under no-load conditions, the MAX20028 consumes only 30µA of quiescent current, making it ideal for automotive applications.The high-voltage synchronous step-down DC-DC controller (OUT1) operates from a voltage up to 36V continuous and is protected from load-dump transients up to 42V. There is a pin-selectable frequency option of either 2.1MHz or a factory-set frequency for 1.05MHz, 525kHz, 420kHz, or 350kHz. The low-voltage, synchronous step-down DC-DC converters run directly from OUT1 and can supply output currents up to 3A. The device provides a spread-spectrum enable input (SSEN) to provide quick improvement in electromagnetic interference when needed. There is also a SYNC I/O for providing either an input to synchronize to an external clock source or an output of the internally generated clock (see the Selector Guide for the different options available). The device includes overtemperature shutdown and overcurrent limiting. The device also includes individual active-low RESET1 outputs and individual enable inputs. The individual active-low RESET1 outputs provide voltage monitoring for all output channels. The MAX20028 is available in a 32-pin (5mm x 5mm x 0.75mm) side-wettable TQFN-EP package and is specified for operation over the -40°C to +125°C automotive temperature range.
Markets and Technologies
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The MAX20028 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that contains all the components necessary to evaluate the MAX20028 power-management IC (PMIC). The EV kit includes one high-voltage step-down controller and two low-voltage step-down converters.
The EV kit can operate from 3.5V to 36V input voltages and is optimized for automotive infotainment applications. The high-voltage controller is configured for a 5V output that provides at least 5A. The low-voltage step-down converters are configured for 3.3V and 1.2V, each providing up to 3A. The EV kit can be easily reconfigured to operate in continuous PWM mode, skip mode, or external synchronization operation.
The EV kit comes with MAX20028ATJA/VY+ device installed, but is capable of evaluating other variants of the MAX20028 IC. Refer to the MAX20028 IC data sheet for external component selection.
Features & Benefits
- 3.5V to 36V Input Range
- 20µA Quiescent Current with DC-DC Controller Enabled
- Output Voltages
- 5V Output at 5A (High-Voltage, Step-Down Controller, Buck 1)
- 3.3V Output at 3A (Step-Down Converter, Buck 2)
- 1.2V Output at 3A (Step-Down Converter, Buck 3)
- High-Frequency Operation
- 2.1MHz or Optional Divide-Down Operation for Buck 1
- Individual Enable Inputs and Reset Outputs
- Proven PCB Layout
- Fully Assembled and Tested
Documentation & Resources
MAX20028 Companion Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|MAX20028ATJA/VY+||Material Declaration||Reliability Data||32-LFCSP_SS-5X5X0.75|
|MAX20028ATJA/VY+T||Material Declaration||Reliability Data||32-LFCSP_SS-5X5X0.75|
|MAX20028ATJB/VY+||Material Declaration||Reliability Data||32-LFCSP_SS-5X5X0.75|
|MAX20028ATJB/VY+T||Material Declaration||Reliability Data||32-LFCSP_SS-5X5X0.75|
|MAX20028ATJC/VY+||Material Declaration||Reliability Data||32-LFCSP_SS-5X5X0.75|
|MAX20028ATJC/VY+T||Material Declaration||Reliability Data||32-LFCSP_SS-5X5X0.75|
|MAX20028BATJA/VY+||Material Declaration||Reliability Data||32-LFCSP_SS-5X5X0.75|
|MAX20028BATJA/VY+T||Material Declaration||Reliability Data||32-LFCSP_SS-5X5X0.75|
|Wafer Fabrication Data|
Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.