Analog Devices Inc./Maxim Integrated MAX20021ATIB/V+

Overview

MAX20021ATIB/V+ from Analog Devices is an automotive-grade quad synchronous step-down DC-DC PMIC integrating four 1A buck converters with factory-programmable 1.0V–4.0V outputs, 3.2MHz fixed-frequency PWM operation, integrated high- and low-side MOSFETs (125mΩ pMOS / 100mΩ nMOS), and -40°C to +125°C operation - used for point-of-load regulation in ADAS domain controllers and infotainment power rails.

For engineers reviewing the MAX20021ATIB/V+ datasheet, MAX20021ATIB/V+ pinout, MAX20021ATIB/V+ application, or MAX20021ATIB/V+ equivalent, key selection criteria include its 3.2MHz switching frequency enabling all-ceramic designs, dual-phase interleaving (OUT3/OUT4 at 180°), spread-spectrum EMI reduction, individual EN/PG signals for sequencing, and automotive AEC-Q100 qualification.

Technical Context

The MAX20021ATIB/V+ implements peak current-mode control with internal slope compensation and loop compensation, eliminating external compensation components. Its hybrid load-line architecture reduces required output capacitance while maintaining fast load-transient response (±3.5% deviation, 4µs recovery).

It features factory-trimmed input undervoltage monitoring (UVM threshold = 4.3V typ), overvoltage protection (OV = 5.8V typ), cycle-by-cycle current limiting (1.65A typ), and thermal shutdown at +185°C with 15°C hysteresis - all operating within a single 28-pin TQFN-EP package with exposed thermal pad.

Key Specifications

Pinout & Package

MAX20021ATIB/V+ is housed in a 28-pin, 5mm × 5mm × 0.8mm TQFN-EP package (package code T2855+5) with exposed thermal pad (EP) connected to GND. The package supports JEDEC-standard reflow and achieves 35°C/W junction-to-ambient thermal resistance on single-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20022ATIB/V+, the MAX20021ATIB/V+ delivers higher switching frequency for smaller magnetics and superior EMI performance via spread spectrum and 180° interleaving; versus TPS653211AQPWPRQ1, it provides full quad-buck capability with finer-grained sequencing and automotive-grade protection coverage.

Availability

MAX20021ATIB/V+ is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, and domain controller applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for MAX20021ATIB/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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.

The MAX20021ATIB/V+ belongs to Analog Devices' automotive power-management IC portfolio, designed specifically for high-reliability, low-EMI point-of-load regulation in next-generation vehicle architectures.

FAQ

What is the switching frequency of the MAX20021ATIB/V+ and is it adjustable?

The MAX20021ATIB/V+ operates at a fixed 3.2MHz switching frequency. It is not user-adjustable via external components but can be synchronized to an external clock between 2.7MHz and 3.5MHz using the SYNC pin. This fixed high frequency enables compact 1.5µH inductors and all-ceramic 10µF output capacitors, reducing solution size and cost. The MAX20021ATIB/V+ does not support internal frequency trimming or resistor-based adjustment.

Does the MAX20021ATIB/V+ support output voltage sequencing, and how is it implemented?

Yes, the MAX20021ATIB/V+ supports precise power-rail sequencing via independent EN1–EN4 enable inputs and open-drain PG1–PG4 power-good outputs. Each buck channel has dedicated control and status signals, allowing staggered startup (e.g., enable core rail first, then I/O, then analog) and fault propagation. The device also includes built-in soft-start (3272 cycles) and factory-programmable UVM timeout to prevent false resets - all coordinated without external circuitry. This makes the MAX20021ATIB/V+ ideal for complex SoC power sequencing.

What protection features does the MAX20021ATIB/V+ include for automotive environments?

The MAX20021ATIB/V+ integrates comprehensive automotive-grade protections: input overvoltage lockout (5.8V typ), input undervoltage monitoring (4.3V typ with factory-trimmed timeout), cycle-by-cycle current limiting (1.65A typ), overtemperature shutdown (+185°C with 15°C hysteresis), and short-circuit protection. All protections operate across the full -40°C to +125°C range and are validated per AEC-Q100. These features ensure robust operation during cold cranking, load dump, and thermal stress scenarios common in automotive applications.

Can the MAX20021ATIB/V+ be used with adjustable output voltages, and what is the feedback configuration?

Yes - although the MAX20021ATIB/V+ is factory-programmed for specific output voltages (including 1.8V and 2.65V on OUT3 via SEL), it supports adjustable outputs via external resistive dividers connected to OUTS1–OUTS4. For example, connecting R1 and R2 between VOUT_ and OUTS_ sets VOUT_ = 1.0V × (1 + R1/R2), with VOUTS_ = 1.0V reference. R2 must be ≤100kΩ, and a compensation capacitor (15pF typical) is required across R1. This flexibility allows fine-tuning for margin testing or custom rail requirements beyond factory defaults.

What is the thermal performance of the MAX20021ATIB/V+ and how should the exposed pad be handled?

The MAX20021ATIB/V+ uses a 28-pin TQFN-EP package with θJC = 3°C/W. Its exposed pad (EP) must be soldered to a large internal or external GND plane using ≥4 thermal vias (0.3mm diameter) to achieve rated thermal performance. Failure to properly connect EP results in excessive junction temperature rise and potential thermal shutdown. Analog Devices recommends minimum 5mm × 5mm copper area under the pad, connected to system GND, to sustain full 1A/channel operation at +125°C ambient. The EP is electrically GND and thermally critical - not optional.