Analog Devices Inc./Maxim Integrated MAX20021ATIC/V+

Overview

MAX20021ATIC/V+ from Analog Devices is an automotive-grade quad synchronous step-down DC-DC PMIC integrating four 1.0A buck converters with factory-programmable or resistor-adjustable 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, and temperature and supports spread-spectrum EMI reduction and external clock synchronization - deployed in ADAS domain controllers and infotainment power rails.

For engineers reviewing the MAX20021ATIC/V+ datasheet, MAX20021ATIC/V+ pinout, MAX20021ATIC/V+ application, or MAX20021ATIC/V+ equivalent, key selection criteria include its 3.2MHz switching frequency (vs. 2.2MHz MAX20022 variants), SEL-pin configurable 1.8V/2.65V OUT3, -40°C to +125°C AEC-Q100–compatible operation, and integrated current-limit/thermal protection with 180° phase interleaving for Buck3/Buck4.

Technical Context

The MAX20021ATIC/V+ 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-trimmed input undervoltage monitoring (UVM threshold = 4.3V typ, hysteresis = 0.1V) and input overvoltage protection (OVP = 5.8V typ), both asserting all PG_ outputs low. The SYNC input accepts 2.7–3.5MHz external clocks, and spread-spectrum modulation (±3% deviation at 1.5kHz rate) applies only to internal oscillator operation.

Key Specifications

Pinout & Package

MAX20021ATIC/V+ 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 θJC = 3°C/W and requires soldering the EP to a large PCB ground plane for thermal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20022ATC/V+, MAX20021ATIC/V+ provides higher-frequency operation and factory-enabled UVM for cold-crank robustness; versus TPS659424RHBR, it offers simpler hardware-based timing control and superior EMI suppression without firmware overhead.

Availability

MAX20021ATIC/V+ is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, and domain controller applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for MAX20021ATIC/V+ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets since 1965.

The MAX20021 is part of Analog Devices' automotive power-management portfolio, designed specifically for safety-critical, high-reliability point-of-load regulation in next-generation vehicle architectures - emphasizing EMI resilience, thermal robustness, and functional safety readiness.

FAQ

What is the switching frequency of the MAX20021ATIC/V+ and how is it set?

The MAX20021ATIC/V+ operates at a fixed 3.2MHz switching frequency, factory-programmed into the die. This value is immutable and distinguishes it from the 2.2MHz MAX20022 variant. No external resistor or pin strap alters this frequency; the SYNC pin only allows synchronization to an external 2.7–3.5MHz clock - it does not change the internal oscillator's nominal rate. The 3.2MHz frequency enables use of smaller 1.5µH inductors and all-ceramic output capacitors, directly supporting compact automotive PCB layouts.

How does the SEL pin configure the output voltage of OUT3 on the MAX20021ATIC/V+?

On the MAX20021ATIC/V+, the SEL pin selects between two factory-trimmed fixed output voltages for OUT3: connecting SEL to PGND_ sets OUT3 to 1.8V, while connecting SEL to PV_ sets it to 2.65V. This selection occurs at power-up and must remain static during operation - toggling SEL causes abrupt output transitions and potential system reset. The MAX20021ATIC/V+ does not support resistor-adjustable OUT3; that capability is reserved for MAX20022 variants with different internal trim architecture.

Does the MAX20021ATIC/V+ include input undervoltage monitoring (UVM), and what is its threshold?

Yes, the MAX20021ATIC/V+ includes factory-enabled input undervoltage monitoring (UVM) with a typical threshold of 4.3V (range: 4.15V–4.45V) and 0.1V hysteresis. When PV_ falls below this threshold, all PG_ outputs assert low to signal a brownout condition, while the device continues operating down to the UVLO threshold of 2.77V. This UVM feature is absent in the MAX20022 and is a key differentiator for cold-crank resilience in 12V automotive systems.

What thermal performance can be expected from the MAX20021ATIC/V+ in a standard 4-layer PCB layout?

In a JEDEC-standard 4-layer board, the MAX20021ATIC/V+ achieves θJA = 35°C/W and supports 2285mW continuous power dissipation at TA = +70°C. With optimized layout - including full EP soldering to a 4cm² internal ground plane, 8× thermal vias under the pad, and removal of solder mask on top/bottom layers - junction temperature rise can be reduced by up to 40°C at full 4×1A load, enabling sustained operation at ambient temperatures approaching +105°C without derating.

Can the MAX20021ATIC/V+ operate with a single input capacitor shared across all four PV_ pins?

No - the MAX20021ATIC/V+ requires a dedicated ≥2.2µF ceramic capacitor placed immediately adjacent to each PV_ pin (PV1–PV4). Although phase interleaving of Buck3/Buck4 reduces net input ripple, shared input capacitance creates high-impedance paths during switching transitions, causing PV_ rail collapse, increased EMI, and potential PG_ false trips. Each PV_ pin must have its own low-ESR, X7R/X5R capacitor with minimal trace length to maintain stability and meet CISPR-25 Class 5 emissions limits.