Analog Devices Inc./Maxim Integrated MAX20003ATPB/V+T

Overview

MAX20003ATPB/V+T from Maxim Integrated is a 3A synchronous buck DC-DC 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 achieves 15µA quiescent current in skip mode, supports 220kHz–2.2MHz resistor-programmable switching frequency, and features PGOOD monitoring and AEC-Q100 qualification for automotive power rails.

For engineers reviewing the MAX20003ATPB/V+T datasheet, MAX20003ATPB/V+T pinout, MAX20003ATPB/V+T application, or MAX20003ATPB/V+T equivalent, key selection criteria include its 99% dropout capability, ±1% FB regulation accuracy, 42V load-dump protection, -40°C to +125°C temperature range, and spread-spectrum EMI reduction via SPS pin control.

Technical Context

This current-mode buck regulator integrates dual MOSFETs and a 5V BIAS LDO to power internal circuitry, enabling operation down to 3.5V input during cold-crank conditions. Its 99% maximum duty cycle and cycle-by-cycle current limiting support robust automotive transient handling, including 42V load-dump events.

The device offers dual operating modes: forced PWM (via FSYNC) for EMI-sensitive systems and skip mode (FSYNC grounded) for ultra-low-no-load current. Frequency synchronization, programmable soft-start (8ms), and open-drain PGOOD with 92.5–95% VFB thresholds enable precise power sequencing in multi-rail automotive ECUs.

Key Specifications

Pinout & Package

MAX20003ATPB/V+T is housed in a 5mm × 5mm, 20-pin TQFN package with exposed pad (EP), optimized for thermal dissipation in automotive PCB layouts. The package code is T2055+4C per Maxim's land pattern 90-0009.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480RQWR and TPS62933RGER, MAX20003ATPB/V+T uniquely combines AEC-Q100 Grade 1, 42V load-dump protection, 99% duty cycle, and integrated spread-spectrum - making it the only option qualified for safety-critical under-hood and ADAS power rails.

Availability

MAX20003ATPB/V+T is available at Aetrix Electronics and suitable for automotive navigation systems, ADAS domain controllers, and body control modules requiring stable component supply across extended temperature and harsh electrical environments.

Supply support for MAX20003ATPB/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 delivers fully integrated, AEC-Q100-qualified buck converters targeting automotive power rails where ultra-low quiescent current, high input voltage tolerance, and EMI control are mandatory.

FAQ

What is the maximum output current capability of the MAX20003ATPB/V+T?

The MAX20003ATPB/V+T delivers up to 3A continuous output current under typical conditions (TA = +25°C, VIN = 14V, VOUT = 5V, fSW = 2.2MHz). Its LX current limit is specified at 3.75A (min) to 6.25A (max), ensuring robust operation across temperature and process variation. Derating applies above +70°C ambient due to thermal resistance (θJA = 30°C/W).

Does the MAX20003ATPB/V+T support fixed-output voltage configurations?

Yes, the MAX20003ATPB/V+T supports fixed 5V and 3.3V outputs by connecting the FB pin directly to the BIAS pin. These configurations achieve ±2% output accuracy over temperature and line/load conditions. For other voltages (1V–10V), an external resistive divider from OUT to FB is required, leveraging the ±1% accurate 1V feedback reference.

How does the MAX20003ATPB/V+T handle automotive load-dump transients?

The MAX20003ATPB/V+T withstands 42V load-dump events (per ISO 7637-2 Pulse 5a) without damage or latch-up. Its absolute maximum rating for SUP and SUPSW is +42V, and internal protection circuitry remains active during the event. No external TVS diode is required for basic compliance, though system-level filtering may still be recommended.

What is the purpose of the dual supply inputs SUP and SUPSW on the MAX20003ATPB/V+T?

SUP powers the internal bias regulator and logic circuitry, while SUPSW independently powers the high-side MOSFET driver. This separation improves noise immunity, enables better dropout performance during cold-crank (when VIN drops near VOUT), and reduces coupling between analog and power-switching domains - critical for stable operation in noisy automotive environments.

Can the MAX20003ATPB/V+T be synchronized to an external clock source?

Yes, the MAX20003ATPB/V+T supports external synchronization via the FSYNC pin. When driven with a logic-level clock (1.8MHz–2.6MHz for 2.2MHz internal setting), the device locks to the external frequency within two cycles. If the external clock stops for more than two cycles, it automatically reverts to the internal oscillator set by the FOSC resistor.