Analog Devices Inc./Maxim Integrated MAX20003CATPB/V+T

Overview

MAX20003CATPB/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 and delivering fixed 5V/3.3V or adjustable 1V–10V output. It features 15µA quiescent current in skip mode, 220kHz–2.2MHz resistor-programmable switching frequency, and AEC-Q100 qualification for automotive point-of-load regulation.

For engineers reviewing the MAX20003CATPB/V+T datasheet, MAX20003CATPB/V+T pinout, MAX20003CATPB/V+T application, or MAX20003CATPB/V+T equivalent, key selection criteria include its 99% dropout duty cycle, ±1% FB accuracy for adjustable outputs, 42V load-dump protection, and spread-spectrum enablement for EMC-sensitive automotive systems.

Technical Context

This current-mode buck regulator integrates dual MOSFETs and a 5V BIAS LDO to power internal circuitry. It supports forced PWM or skip mode via FSYNC pin control, with cycle-by-cycle current limiting and thermal shutdown at 175°C (15°C hysteresis).

The device uses a transconductance error amplifier (700µS) with external COMP compensation, monitors output via PGOOD (92.5–95% VFB thresholds), and enables synchronization to external clocks within ±20% of internal frequency - all while maintaining 15µA no-load IQ across –40°C to +125°C.

Key Specifications

Pinout & Package

MAX20003CATPB/V+T is housed in a 5mm × 5mm, 20-pin TQFN package with exposed pad (EP), optimized for thermal dissipation in high-density automotive PCBs. The package has θJA = 30°C/W on a four-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480RQR and TPS543B20RTWR, MAX20003CATPB/V+T uniquely combines 36V operation, 99% dropout, spread-spectrum control, and AEC-Q100 Grade 1 in a single 5mm × 5mm package - making it optimal for cost-sensitive, EMI-constrained automotive POE applications without digital overhead.

Availability

MAX20003CATPB/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control unit designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for MAX20003CATPB/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.

The MAX20002/MAX20003 product line targets automotive power conversion with integrated FETs, ultra-low IQ, and robust transient handling - specifically engineered for demanding point-of-load applications in vehicles.

FAQ

What is the maximum output current capability of the MAX20003CATPB/V+T?

The MAX20003CATPB/V+T delivers up to 3A continuous output current under typical thermal conditions (θJA = 30°C/W, TA ≤ +70°C). Its LX current limit is specified at 3.75A (min) to 6.25A (max), ensuring reliable operation across temperature and process variation. Derating applies above +70°C ambient per the 33.3mW/°C thermal coefficient.

Does the MAX20003CATPB/V+T support adjustable output voltages?

Yes, the MAX20003CATPB/V+T supports output voltages from 1V to 10V using an external resistive divider connected to the FB pin. When FB is tied directly to BIAS, it defaults to fixed 5V or 3.3V output. The FB reference voltage is tightly controlled at 0.99–1.01V (±1%), enabling accurate programmable regulation.

How does the MAX20003CATPB/V+T handle automotive load-dump transients?

The MAX20003CATPB/V+T withstands 42V load-dump transients (per ISO 7637-2 Pulse 5a) without shutdown or damage. Its SUP and SUPSW pins are rated to 42V, and internal protection circuitry maintains regulation during the event. This eliminates the need for external TVS diodes in many automotive designs.

Can the MAX20003CATPB/V+T operate in forced PWM mode?

Yes, the MAX20003CATPB/V+T operates in forced PWM mode when the FSYNC pin is driven high (to BIAS) or connected to an external clock signal. This disables skip mode and locks the switching frequency to either the internal resistor-programmed value or the external clock - essential for EMI-sensitive or noise-critical applications.

What package type and thermal characteristics does the MAX20003CATPB/V+T use?

The MAX20003CATPB/V+T uses a 20-pin TQFN package (5mm × 5mm, exposed pad), with thermal resistance θJA = 30°C/W and θJC = 2°C/W on a four-layer board. The exposed pad must be soldered to a large contiguous copper ground plane to achieve rated power dissipation and junction temperature limits.