Analog Devices Inc./Maxim Integrated MAX20003ATPB/V+

Overview

MAX20003ATPB/V+ 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 with ±1% FB accuracy. It features 15µA quiescent current in skip mode, 220kHz–2.2MHz programmable switching frequency, and AEC-Q100 qualification for automotive point-of-load regulation.

For engineers reviewing the MAX20003ATPB/V+ datasheet, MAX20003ATPB/V+ pinout, MAX20003ATPB/V+ application, or MAX20003ATPB/V+ equivalent, this page delivers verified electrical parameters, validated 20-pin TQFN package mapping, confirmed automotive-grade protection features (42V load-dump, -40°C to +125°C), and real-world design implications for power sequencing, EMI control via spread spectrum, and dropout operation at 99% duty cycle.

Technical Context

This device implements current-mode control with internal transconductance error amplifier (700µS), fixed 8ms soft-start, and dual-mode operation: forced PWM (for EMI-sensitive systems) and skip mode (for ultra-low I_Q). Its dual supply inputs-SUP (bias regulator input) and SUPSW (high-side switch supply)-enable robust cold-crank performance down to 3.5V while maintaining regulation under transient undervoltage conditions.

The IC integrates a 5V BIAS linear regulator (4.7–5.4V output, ±200mV UVLO hysteresis), open-drain PGOOD with 95%/92.5% V_FB thresholds, and cycle-by-cycle current limiting (6.25A peak for MAX20003 variants). Thermal shutdown activates at 175°C with 15°C hysteresis, and overvoltage protection triggers at 107% V_OUT with fast recovery optimized for automotive transients.

Key Specifications

Pinout & Package

MAX20003ATPB/V+ is housed in a 5mm × 5mm, 20-pin TQFN package with exposed pad (EP), outline number 21-0140, thermal resistance θ_JA = 30°C/W on four-layer board. The EP must be soldered to a large-area contiguous copper ground plane for thermal management and connected to PGND - it is not a standalone ground connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480RQWR and TPS543B20RTWT, MAX20003ATPB/V+ uniquely combines AEC-Q100 qualification, 42V load-dump immunity, integrated spread spectrum, and 3.5V cold-crank support - making it the only drop-in solution for safety-critical automotive power rails without external protection circuitry.

Availability

MAX20003ATPB/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, body control units, and telematics systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX20003ATPB/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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for automotive, industrial, and communications markets, with emphasis on high-reliability, low-power solutions.

MAX20003ATPB/V+ belongs to the MAX2000x automotive buck converter family, engineered specifically for demanding vehicle subsystems requiring AEC-Q100 compliance, ultra-low quiescent current, and robust transient handling without external protection components.

FAQ

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

The MAX20003ATPB/V+ delivers up to 3A continuous output current under typical thermal conditions (θ_JA = 30°C/W, T_A ≤ +70°C). Its LX current limit is specified at 3.75A (min) to 6.25A (max), ensuring robust overload protection. Derating applies above +70°C ambient - at +125°C, usable current drops to ~1.8A due to thermal limits. This rating is validated per the Electrical Characteristics table for MAX20003C/EATPB/V+ variant.

Does the MAX20003ATPB/V+ support fixed 5V output without external resistors?

Yes, the MAX20003ATPB/V+ supports fixed 5V output by connecting the FB pin directly to the BIAS pin - no external resistor divider is required. This configuration leverages the internal 1V feedback reference and achieves ±2% output accuracy. The same method yields 3.3V output. For voltages outside 3.3V/5V, an external resistive divider from OUT to FB to AGND is mandatory.

How does the spread spectrum feature work on the MAX20003ATPB/V+?

The MAX20003ATPB/V+ enables ±3% frequency dithering around the programmed f_SW when the SPS pin is pulled high. At 2.2MHz, the modulation period is 110µs - ramping down 3%, returning to center, then up 3%. Modulation scales linearly with f_SW (e.g., 400kHz uses 550µs period). Spread spectrum is disabled during external clock synchronization (FSYNC active), but external clock modulation passes through unchanged.

What is the purpose of the separate SUP and SUPSW pins on the MAX20003ATPB/V+?

SUP powers the internal 5V BIAS regulator, while SUPSW supplies the high-side gate driver. This separation isolates gate drive losses from bias generation, enabling stable operation during cold crank when input voltage drops below the output voltage. It allows the IC to maintain regulation at 3.5V input by running at 99% duty cycle - a key differentiator for automotive applications where other single-supply buck converters would dropout.

Is the MAX20003ATPB/V+ qualified for automotive use?

Yes, the MAX20003ATPB/V+ is AEC-Q100 qualified (Grade 0: -40°C to +125°C ambient) and designed for automotive applications. It includes 42V load-dump protection, cold-crank operation down to 3.5V, and built-in protections (OVP, thermal shutdown, cycle-by-cycle current limit) validated per ISO 7637-2. The "V+" suffix denotes automotive-grade packaging and screening per Maxim's automotive product definition.