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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Analog Devices Inc./Maxim Integrated MAX20021ATIA/V+T

Name: MAX20021ATIA/V+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX20021ATIA/V+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX20021ATIA/V+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 28-WFQFN Exposed Pad

Datasheet:: MAX20021ATIA/V+T.pdf

Description:: IC REG BUCK 1.25V QUAD 28TQFN

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Product details

Overview

MAX20021ATIA/V+T from Analog Devices is an automotive-grade quad synchronous step-down DC-DC PMIC integrating four 1.0A buck converters with factory- or resistor-programmable outputs (1.0V–4.0V), 3.0V–5.5V input range, and 3.2MHz fixed-frequency PWM operation. It delivers ±3% output accuracy over load/line/temperature and features spread-spectrum EMI reduction, 180° phase interleaving for two channels, and individual enable/PG outputs - deployed in ADAS domain controllers and infotainment power rails.

For engineers reviewing the MAX20021ATIA/V+T datasheet, MAX20021ATIA/V+T pinout, MAX20021ATIA/V+T application, or MAX20021ATIA/V+T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive temperature performance (−40°C to +125°C), real-world EMI mitigation features (SYNC input, spread-spectrum option), and precise alternative selection guidance for point-of-load regulation in safety-critical vehicle systems.

Technical Context

The MAX20021ATIA/V+T uses peak current-mode control with internal slope and loop compensation, eliminating external compensation components. Its hybrid load-line architecture reduces required output capacitance while maintaining fast load-transient response (±1.5% deviation at 1A step).

It implements factory-selectable input undervoltage monitoring (UVM) with 4.3V threshold and 15µs UV/OV propagation delay, plus cycle-by-cycle current limiting (1.65A typical limit) and thermal shutdown at +185°C with 15°C hysteresis. All four bucks operate in forced-PWM mode outside the AM band and support external clock synchronization via SYNC pin (2.7–3.5MHz range).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.0V to 5.5V - supports direct connection to automotive battery rail with transient tolerance up to 6.0V absolute max.
Switching Frequency	3.2MHz (fixed) - enables all-ceramic capacitor design and compact 1.5µH inductors; reduces EMI through high-frequency spectral spreading.
Output Current per Channel	Up to 1.0A - sufficient for powering SoC cores, memory, and interface ICs in modern automotive ECUs.
Output Voltage Range	1.0V to 4.0V (factory- or resistor-programmable) - covers DDR memory, FPGA I/O, MCU cores, and sensor interfaces without external feedback resistors in preset versions.
Operating Temperature	−40°C to +125°C - qualified for under-hood and cabin-mounted automotive applications per AEC-Q100 Grade 0 requirements.
Thermal Resistance θJC	3°C/W - low junction-to-case resistance enabled by exposed-pad TQFN package, allowing efficient heat transfer to PCB ground plane.
Power-Good Accuracy	±6% UV / ±10% OV detection - ensures reliable system reset signaling during brownout or overvoltage events with 20,480-cycle assertion hold time.

Pinout & Package

MAX20021ATIA/V+T is housed in a 28-pin, 5mm × 5mm × 0.8mm TQFN-EP package with exposed thermal pad (EP = GND). The package supports high-power density layout with low-inductance grounding paths via four dedicated PGND pins (PGND1–PGND4) and separate analog ground (GND).

Pin/Terminal	Circuit Role	Design Meaning
EN1–EN4	Active-high digital enable inputs	Independent channel control enabling staggered soft-start sequencing (24,576-cycle blanking between EN2–EN4) to limit inrush current.
PG1–PG4	Open-drain power-good outputs	Assert low on ±6% UV or ±10% OV; require external 10kΩ pull-up to VA; remain high-impedance when buck is in regulation.
LX1–LX4	Switching node terminals	High-impedance when off; drive external 1.5µH inductors; require low-ESR ceramic caps placed adjacent to PV_ pins.
OUTS1–OUTS4	Voltage sense inputs	Connect directly to VOUT_ for fixed 1.0V outputs; used with external resistor divider for adjustable outputs (VOUTS_ = 1000mV reference).
SEL	Buck 3 output-voltage select	Connect to PGND_ for 1.8V or PV_ for 2.65V output; no soft transition - must be static during operation.
SYNC	External clock synchronization input	Accepts 2.7–3.5MHz signal to align switching frequency; connect to PGND_ to use internal 3.2MHz oscillator.

Key Features

Feature	Design Value
180° phase interleaving (OUT1/OUT2 vs. OUT3/OUT4)	Reduces input ripple current by ~70%, cutting required bulk input capacitance and easing EMI filter design.
Integrated pMOS/nMOS FETs (125mΩ/100mΩ typical RDS(on))	Eliminates discrete MOSFETs and gate drivers, reducing BOM count and PCB area while sustaining >90% efficiency at 1A load.
Factory-programmable UVM and spread-spectrum options	Enables drop-in replacement across variants without layout changes; UVM triggers PG_ low at 4.3V to flag brownout before UVLO shutdown at 2.77V.
Fixed 3272-cycle soft-start ramp	Prevents inrush current spikes during power-up; operates in skip mode during ramp to avoid output discharge.
Hybrid load-line architecture	Reduces required output capacitance by 30–40% versus conventional buck designs, lowering cost and board space for 10µF X7R ceramic solutions.

Applications

ADAS Camera Module Power	Infotainment SoC Core Rail
Use Scenario: Dual-camera front-facing ADAS system requiring isolated, low-noise 1.2V and 1.8V rails for image sensors and ISP processing. IC Role / Device Role / Timing Role: Quad buck PMIC supplies independent, sequenced, and EMI-optimized voltages to camera sensor array and vision processor subsystems. Use Value: 3.2MHz switching and 180° phasing minimize conducted emissions near sensitive analog video paths; PG outputs coordinate safe boot sequence.	Use Scenario: Automotive infotainment head unit with quad-core application processor needing tightly regulated 1.0V core, 1.1V GPU, 1.8V I/O, and 3.3V peripheral rails. IC Role / Device Role / Timing Role: Centralized power management IC delivering synchronized, soft-started, and monitored voltage domains to SoC and peripherals. Use Value: Individual EN_/PG_ pins enable precise power sequencing; ±3% output accuracy maintains SoC stability across temperature and load transients.
Domain Controller Post-Regulation	Body Control Module (BCM) Subsystem
Use Scenario: Zonal architecture domain controller receiving 12V input and requiring clean, low-ripple 1.2V, 2.65V, 3.3V, and 5.0V (via LDO post-reg) rails. IC Role / Device Role / Timing Role: Primary DC-DC regulator stage converting intermediate bus to multiple low-voltage point-of-load supplies. Use Value: Spread-spectrum mode and SYNC input allow EMI tuning to meet CISPR 25 Class 5 limits; thermal shutdown protects against enclosure overheating.	Use Scenario: BCM managing lighting, door locks, and HVAC with mixed-voltage ICs (CAN transceivers, microcontrollers, LED drivers). IC Role / Device Role / Timing Role: Multi-rail power source providing isolated, fault-tolerant supplies with brownout detection and reset coordination. Use Value: Input UVM monitors battery health; PG_ outputs feed microcontroller reset logic; -40°C to +125°C rating ensures reliability in trunk-mounted modules.

ADAS Camera Module Power

Infotainment SoC Core Rail

Use Scenario: Dual-camera front-facing ADAS system requiring isolated, low-noise 1.2V and 1.8V rails for image sensors and ISP processing.

IC Role / Device Role / Timing Role: Quad buck PMIC supplies independent, sequenced, and EMI-optimized voltages to camera sensor array and vision processor subsystems.

Use Value: 3.2MHz switching and 180° phasing minimize conducted emissions near sensitive analog video paths; PG outputs coordinate safe boot sequence.

Use Scenario: Automotive infotainment head unit with quad-core application processor needing tightly regulated 1.0V core, 1.1V GPU, 1.8V I/O, and 3.3V peripheral rails.

IC Role / Device Role / Timing Role: Centralized power management IC delivering synchronized, soft-started, and monitored voltage domains to SoC and peripherals.

Use Value: Individual EN_/PG_ pins enable precise power sequencing; ±3% output accuracy maintains SoC stability across temperature and load transients.

Domain Controller Post-Regulation

Body Control Module (BCM) Subsystem

Use Scenario: Zonal architecture domain controller receiving 12V input and requiring clean, low-ripple 1.2V, 2.65V, 3.3V, and 5.0V (via LDO post-reg) rails.

IC Role / Device Role / Timing Role: Primary DC-DC regulator stage converting intermediate bus to multiple low-voltage point-of-load supplies.

Use Value: Spread-spectrum mode and SYNC input allow EMI tuning to meet CISPR 25 Class 5 limits; thermal shutdown protects against enclosure overheating.

Use Scenario: BCM managing lighting, door locks, and HVAC with mixed-voltage ICs (CAN transceivers, microcontrollers, LED drivers).

IC Role / Device Role / Timing Role: Multi-rail power source providing isolated, fault-tolerant supplies with brownout detection and reset coordination.

Use Value: Input UVM monitors battery health; PG_ outputs feed microcontroller reset logic; -40°C to +125°C rating ensures reliability in trunk-mounted modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-buck PMIC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX20022ATIA/V+T	2.2MHz switching frequency (vs. 3.2MHz); SEL pin unconnected (no 1.8V/2.65V selection); identical pinout and package.	Better suited for noise-sensitive analog circuits where lower switching frequency eases filtering; lacks UVM option.	Select MAX20022ATIA/V+T when 2.2MHz operation and absence of UVM monitoring align with system EMI and monitoring requirements.
TPS659424RHBR	6-channel PMIC with integrated LDOs; 2.2MHz switching; different pinout; requires external compensation; no spread-spectrum option.	Targets higher-complexity domain controllers needing >4 rails and mixed DC-DC/LDO regulation; broader feature set but larger footprint.	Choose TPS659424RHBR only if additional rails, LDO integration, or TI ecosystem compatibility outweigh MAX20021ATIA/V+T's EMI advantages and smaller size.

Compared with MAX20022ATIA/V+T and TPS659424RHBR, the MAX20021ATIA/V+T offers superior EMI performance via 3.2MHz operation and spread-spectrum modulation, tighter thermal protection (185°C shutdown), and factory-configurable UVM - making it optimal for compact, high-density automotive modules where radiated emissions and brownout resilience are critical.

Availability

MAX20021ATIA/V+T is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power delivery, and domain controller post-regulation requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for MAX20021ATIA/V+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and connectivity solutions.

The MAX20021ATIA/V+T belongs to Analog Devices' automotive PMIC portfolio, engineered specifically for AEC-Q100-compliant, low-EMI, multi-rail power conversion in next-generation vehicle electronics - emphasizing thermal robustness, functional safety readiness, and layout simplicity.

FAQ

What is the switching frequency of the MAX20021ATIA/V+T and how does it impact design?

The MAX20021ATIA/V+T operates at a fixed 3.2MHz switching frequency. This high frequency allows use of small 1.5µH inductors and all-ceramic capacitors, significantly reducing solution size and cost. It also shifts switching noise above the AM radio band (530–1710kHz), easing EMI compliance. The device supports spread-spectrum modulation and external synchronization via the SYNC pin to further suppress radiated emissions in sensitive automotive environments.

How does the MAX20021ATIA/V+T handle input undervoltage conditions?

The MAX20021ATIA/V+T includes a factory-programmable input undervoltage monitor (UVM) that asserts all PG_ outputs low when PV_ falls below 4.3V (typ), indicating a brownout condition. This occurs before the UVLO threshold of 2.77V (typ), allowing system-level warning and graceful shutdown. The UVM timeout is factory-trimmed, and PG_ remains low for 20,480 switching cycles after recovery to ensure stable re-enabling.

Can the MAX20021ATIA/V+T be used with adjustable output voltages?

Yes - while the MAX20021ATIA/V+T is factory-configured for specific output voltages (including 1.8V and 2.65V on OUT3 via SEL pin), it supports adjustable outputs using external resistor dividers on OUTS1–OUTS4. With VOUTS_ = 1000mV reference, outputs can be set from 1.0V to VPV_ − 0.5V (up to 4.0V). R2 must be ≤100kΩ; R1 is calculated as R1 = R2 × (VOUT_ / 1000mV − 1), and a frequency-compensating capacitor is required across R1.

What thermal management features does the MAX20021ATIA/V+T include?

The MAX20021ATIA/V+T integrates overtemperature protection that shuts down all buck converters when junction temperature exceeds +185°C (typ), with 15°C hysteresis for automatic recovery. Its 28-pin TQFN-EP package has θJC = 3°C/W and relies on the exposed pad soldered to a large PCB ground plane for heat dissipation. Layout best practices - including thermal vias, copper pour, and removal of solder mask over the pad - are essential to maintain TJ ≤ +150°C under full 1.0A/channel load.

Is the MAX20021ATIA/V+T pin-compatible with other devices in the MAX20021/MAX20022 family?

Yes - the MAX20021ATIA/V+T shares identical pinout, package (28-pin TQFN-EP), and footprint with all MAX20021 and MAX20022 variants, including MAX20022ATIA/V+T. Differences are limited to internal configuration (switching frequency, UVM presence, SEL behavior), making them drop-in replacements in most layouts. No PCB changes are required when substituting within the same package code, provided system-level timing and monitoring requirements align.

MAX20021ATIA/V+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 28-WFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 4

Voltage - Input (Min):: 3V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1.25V, 1.8V, 2.65V, 3.3V

Voltage - Output (Max):: -

Current - Output:: 1A, 500mA, 500mA, 1A

Frequency - Switching:: 3.2MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TQFN (5x5)

MAX20021ATIA/V+T FAQ

1.How can I place an order for MAX20021ATIA/V+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX20021ATIA/V+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MAX20021ATIA/V+T reliable?

The price and inventory of MAX20021ATIA/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20021ATIA/V+T is usually 5 days.

3.What payment methods are accepted for MAX20021ATIA/V+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20021ATIA/V+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX20021ATIA/V+T?

MAX20021ATIA/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX20021ATIA/V+T order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MAX20021ATIA/V+T?

For technical support, including MAX20021ATIA/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20021ATIA/V+T requirements.

6.How does Aetrix verify that MAX20021ATIA/V+T is sourced from the original manufacturer or authorized distributors?

All MAX20021ATIA/V+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX20021ATIA/V+T meets industry standards.

7.What is the process for return or replacement of MAX20021ATIA/V+T?

All MAX20021ATIA/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20021ATIA/V+T, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MAX20021ATIA/V+T part is unused and in its original packaging.

Return procedure for MAX20021ATIA/V+T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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