Analog Devices Inc./Maxim Integrated MAX20021ATIC/V+T

Overview

MAX20021ATIC/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 on OUT3/OUT4, and integrated thermal/overcurrent/UVLO/OV protection - deployed in ADAS domain controllers and infotainment power rails.

For engineers reviewing the MAX20021ATIC/V+T datasheet, MAX20021ATIC/V+T pinout, MAX20021ATIC/V+T application, or MAX20021ATIC/V+T equivalent, key selection considerations include its 3.2MHz switching frequency (vs. 2.2MHz MAX20022 variants), SEL-pin configurable 1.8V/2.65V OUT3, TQFN-EP (5mm × 5mm) package with exposed thermal pad, and automotive AEC-Q100 qualification for -40°C to +125°C operation.

Technical Context

The MAX20021ATIC/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 under 0→1A step).

It implements factory-trimmed input undervoltage monitoring (UVM threshold = 4.3V typ), 180° phase interleaving between OUT3 and OUT4 to halve input ripple current, and a 3272-cycle soft-start sequence per channel with staggered enable delays to prevent inrush stacking. The SYNC input accepts 2.7–3.5MHz external clocks for system-level timing alignment.

Key Specifications

Pinout & Package

MAX20021ATIC/V+T is housed in a 28-pin thermally enhanced TQFN package (5mm × 5mm, 0.8mm height) with exposed pad connected to GND for optimal heat transfer. Pin pitch is 0.5mm; land pattern follows JEDEC MO-220 standard (Outline 21-0140, Land Pattern 90-0027).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20022ATC/V+T and TPS65321A-Q1, the MAX20021ATIC/V+T uniquely combines 3.2MHz operation, factory-UVM, and 180° phase interleaving to minimize passive count and radiated emissions in space-constrained ADAS modules - making it optimal for next-gen camera radar fusion units.

Availability

MAX20021ATIC/V+T is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, infotainment SoC power delivery, and electric power steering ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX20021ATIC/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, and communications markets since 1965.

The MAX20021 is part of Analog Devices' automotive power-management portfolio, designed specifically for high-density, low-EMI point-of-load regulation in ADAS, infotainment, and chassis control systems operating up to +125°C.

FAQ

What is the switching frequency of the MAX20021ATIC/V+T and how does it impact component selection?

The MAX20021ATIC/V+T operates at a fixed 3.2MHz switching frequency. This high frequency allows use of compact 1.5µH shielded inductors and 10µF X7R ceramic output capacitors per channel, significantly reducing board area versus lower-frequency alternatives. It also enables all-ceramic input filtering with just 2.2µF per PV_ rail due to phase interleaving, eliminating bulky electrolytic or tantalum capacitors in automotive layouts.

How does the SEL pin function on the MAX20021ATIC/V+T and what output voltages does it support?

The SEL pin on the MAX20021ATIC/V+T selects the factory-programmed output voltage for OUT3: connecting SEL to PGND_ configures OUT3 for 1.8V, while connecting SEL to PV_ sets it to 2.65V. This dual-voltage capability supports flexible SoC I/O domain requirements without redesign. The pin must remain static during operation - toggling SEL causes abrupt voltage transitions that may disrupt connected logic.

Does the MAX20021ATIC/V+T include input voltage monitoring, and what thresholds trigger action?

Yes, the MAX20021ATIC/V+T includes factory-enabled input undervoltage monitoring (UVM) with a typical threshold of 4.3V (falling). When PV_ drops below this level, all PG_ outputs assert low to signal a brownout condition. It also features input overvoltage protection (OVP) triggering at 5.8V (rising) and undervoltage lockout (UVLO) at 2.77V (falling), ensuring robust fault response across automotive battery transients.

What thermal performance can be expected from the MAX20021ATIC/V+T in a typical automotive PCB layout?

In a standard 4-layer PCB with 2oz copper, 6 thermal vias under the exposed pad, and a 500mm² internal GND plane, the MAX20021ATIC/V+T achieves θJA ≈ 35°C/W. At 1.0A per channel (4W total dissipation), junction temperature rise is ~140°C above ambient - well within the +150°C max rating. With optimized layout (top/bottom copper heatsinks, solder-mask removal), θJA can improve to ~22°C/W, supporting full 4A load at +85°C ambient.

Can the MAX20021ATIC/V+T synchronize to an external clock, and what frequency range is supported?

Yes, the MAX20021ATIC/V+T supports external clock synchronization via the SYNC pin. For its 3.2MHz internal oscillator, SYNC accepts input frequencies from 2.7MHz to 3.5MHz. This allows precise timing alignment across multiple PMICs in distributed power architectures - critical for noise-sensitive radar or camera modules where beat frequencies must be avoided.