Analog Devices Inc./Maxim Integrated MAX20003CATPC/V+T

Overview

MAX20003CATPC/V+T from Maxim Integrated is a 3A synchronous buck converter with integrated high-side and low-side MOSFETs, operating from 3.5V to 36V input, delivering fixed 5V/3.3V or adjustable 1V–10V output, featuring 15µA quiescent current in skip mode and AEC-Q100 qualification for automotive power rails.

For engineers reviewing the MAX20003CATPC/V+T datasheet, MAX20003CATPC/V+T pinout, MAX20003CATPC/V+T application, or MAX20003CATPC/V+T equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed automotive-grade thermal and protection behavior, and real-world design implications of its 99% duty-cycle dropout operation, spread-spectrum enablement, and FSYNC-controlled PWM/skip mode selection.

Technical Context

The MAX20003CATPC/V+T implements current-mode control with internal transconductance error amplifier (700µS), programmable oscillator (220kHz–2.2MHz via FOSC resistor), and cycle-by-cycle overcurrent protection with 5A typical LX current limit. Its dual-supply architecture separates SUP (bias regulator input) and SUPSW (high-side switch supply), enabling robust cold-crank operation down to 3.5V.

It integrates a 5V BIAS linear regulator (4.7–5.4V, ±2% accuracy), open-drain PGOOD with 92.5–95% VFB threshold hysteresis, and spread-spectrum modulation (±3% frequency deviation, 110µs period at 2.2MHz) activated by SPS pin - all while maintaining AEC-Q100 Grade-1 (−40°C to +125°C) operation and 42V load-dump tolerance.

Key Specifications

Pinout & Package

MAX20003CATPC/V+T is housed in a 5mm × 5mm, 20-pin TQFN package with exposed pad (EP), optimized for thermal dissipation in automotive under-hood environments. The package uses JEDEC MS-013AC outline (21-0140) and requires EP soldered to a large-area PGND copper plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with LM61480RQWR and TPS543B20RJER, the MAX20003CATPC/V+T uniquely combines AEC-Q100 Grade 1 operation, 42V load-dump immunity, 3.5V cold-crank capability, and integrated spread spectrum - making it the only choice for safety-critical, under-hood automotive power rails requiring zero external EMI mitigation components.

Availability

MAX20003CATPC/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, body control units, and telematics control units requiring stable component supply across extended temperature and harsh electrical environments.

Supply support for MAX20003CATPC/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

Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets - emphasizing high reliability, small form factor, and system-level integration.

The MAX20003 belongs to Maxim's automotive-grade power management portfolio, engineered specifically for demanding vehicle subsystems requiring AEC-Q100 compliance, wide-input operation, and robust transient immunity - from infotainment to autonomous driving support rails.

FAQ

What is the maximum output current capability of the MAX20003CATPC/V+T?

The MAX20003CATPC/V+T delivers up to 3A continuous output current under thermal and layout-optimized conditions. Its LX current limit is specified at 5A typical (min 3.75A, max 6.25A), ensuring robust overload handling. Actual achievable current depends on input voltage, output voltage, ambient temperature, PCB copper area, and airflow - with full 3A sustained at 14V_IN/5V_OUT and +70°C ambient using recommended layout and thermal vias to the exposed pad.

Does the MAX20003CATPC/V+T support fixed-output voltage configurations without external resistors?

Yes, the MAX20003CATPC/V+T supports factory-trimmed fixed outputs: connecting the FB pin directly to the BIAS pin configures the device for either 5V (±2%) or 3.3V (±2%) output, eliminating external feedback resistors. This simplifies design for standard logic rails and reduces component count - ideal for high-volume automotive modules where BOM consistency and test repeatability are critical.

How does the MAX20003CATPC/V+T handle automotive cold-crank conditions?

The MAX20003CATPC/V+T operates down to 3.5V input and supports 99% maximum duty cycle, allowing it to maintain regulation during cold-crank events where battery voltage dips below 6V. Its dual-supply architecture (SUP and SUPSW) ensures internal bias remains active even as input sags, while the PGOOD output remains asserted until VOUT falls below 92.5% - providing clean power sequencing for downstream microcontrollers during engine start.

Can the MAX20003CATPC/V+T be synchronized to an external clock source?

Yes, the MAX20003CATPC/V+T accepts an external clock on the FSYNC pin, supporting frequencies from 1.8MHz to 2.6MHz (±20% of internal fSW). It achieves lock within two cycles and automatically reverts to internal oscillation if the external clock is lost for more than two periods. This enables deterministic EMI reduction in multi-converter systems - such as those powering infotainment displays and audio amplifiers simultaneously.

What thermal protection features are implemented in the MAX20003CATPC/V+T?

The MAX20003CATPC/V+T incorporates junction-temperature-based thermal shutdown at 175°C (typical), with 15°C hysteresis to prevent cycling. When triggered, it disables both the bias regulator and the step-down converter, allowing passive cooling before automatic restart. Its 5mm × 5mm TQFN package has θ_JA = 30°C/W on a four-layer board, and the exposed pad must be soldered to a large PGND copper area to achieve rated 3A performance at +125°C ambient.