MAX20028

RECOMMENDED FOR NEW DESIGNS

Step-Down Controller with Dual 2.1MHz Step-Down DC-DC Converters

Automotive PMIC for Cluster/ADAS Meeting ASIL Specifications

Data Sheet (Rev. 8) Product Selection Table

Part Models: 8
1ku List Price: Starting From $2.50

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Overview

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 C_OUT2 and C_OUT3 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.

Applications

Automotive
Industrial
ADAS

Part Models: 8
1ku List Price: Starting From $2.50

Documentation

Data Sheet 1

MAX20028: Step-Down Controller with Dual 2.1MHz Step-Down DC-DC Converters Data Sheet (Rev.8) 08/01/2023

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX20028ATJA/VY+	32-LFCSP_SS-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX20028ATJA/VY+T	32-LFCSP_SS-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX20028ATJB/VY+	32-LFCSP_SS-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX20028ATJB/VY+T	32-LFCSP_SS-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX20028ATJC/VY+	32-LFCSP_SS-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX20028ATJC/VY+T	32-LFCSP_SS-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX20028BATJA/VY+	32-LFCSP_SS-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX20028BATJA/VY+T	32-LFCSP_SS-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 27, 2024 - 2419B ASSEMBLY
		pcn_2419b
MAX20028ATJA/VY+	PRODUCTION
MAX20028ATJA/VY+T	PRODUCTION
MAX20028ATJC/VY+	PRODUCTION
MAX20028ATJC/VY+T	PRODUCTION
Apr 23, 2024 - 2419N ASSEMBLY
		pcn_2419n
MAX20028BATJA/VY+	PRODUCTION
MAX20028BATJA/VY+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 2
MAX16993	PRODUCTION	Step-Down Controller with Dual 2.1MHz Step-Down DC-DC Converters
MAX16930	PRODUCTION	2MHz, 36V, Dual Buck with Preboost and 20µA Quiescent Current

Evaluation Kits

Evaluation Kit for the MAX20028

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Features and 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

Product Details

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.