Analog Devices Inc./Maxim Integrated MAX20003CATPB/V+

Overview

MAX20003CATPB/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. It features 15µA quiescent current in skip mode, 220kHz–2.2MHz resistor-programmable switching frequency, and AEC-Q100 qualification for automotive power rails.

For engineers reviewing the MAX20003CATPB/V+ datasheet, MAX20003CATPB/V+ pinout, MAX20003CATPB/V+ application, or MAX20003CATPB/V+ equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade protection features (42V load-dump, -40°C to +125°C), and real-world design implications for point-of-load regulation in navigation units and distributed DC systems.

Technical Context

This current-mode buck regulator integrates dual MOSFETs and uses internal transconductance error amplification (700µS) with external COMP compensation. Its control logic supports forced PWM or skip mode via FSYNC pin, with cycle-by-cycle current limiting and 99% maximum duty cycle for cold-crank operation.

The device employs dual supply inputs (SUP and SUPSW), a 5V BIAS linear regulator (±2% accuracy), and open-drain PGOOD with 95%/92.5% VFB thresholds. Spread spectrum (±3% frequency modulation, 110µs period at 2.2MHz) is enabled by SPS pin and disabled during external synchronization.

Key Specifications

Pinout & Package

MAX20003CATPB/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.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with LM61480RQWR and TPS543B20RTWT, MAX20003CATPB/V+ uniquely combines AEC-Q100 Grade 0 qualification, integrated PGOOD, programmable spread spectrum, and 42V load-dump tolerance - making it the only option qualified for safety-critical automotive power domains without external protection components.

Availability

MAX20003CATPB/V+ is available at Aetrix Electronics and suitable for automotive navigation systems, ADAS camera modules, and body control units requiring stable component supply across extended temperature and voltage transients.

Supply support for MAX20003CATPB/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 demanding industrial, medical, and automotive applications.

MAX20003 belongs to Maxim's automotive-grade power portfolio, engineered specifically for robust point-of-load conversion in harsh environments - emphasizing low IQ, wide VIN, transient immunity, and AEC-Q100 compliance.

FAQ

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

The MAX20003CATPB/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 handling. Derating applies above +70°C ambient; full 3A is maintained up to +105°C with adequate PCB copper area and airflow. The MAX20003CATPB/V+ datasheet confirms this rating across -40°C to +125°C junction temperature.

Does the MAX20003CATPB/V+ support adjustable output voltage?

Yes, the MAX20003CATPB/V+ supports both fixed and adjustable outputs. Connecting FB directly to BIAS selects factory-trimmed 5V or 3.3V outputs (±2% accuracy). For 1V–10V adjustment, an external resistive divider from OUT to FB to AGND is used, leveraging the 1.00V ±0.5% internal reference. The MAX20003CATPB/V+ FB input current is only 20–100nA, minimizing divider error.

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

The MAX20003CATPB/V+ withstands 42V load-dump transients (per ISO 7637-2 Pulse 5a) without external protection, thanks to its 42V absolute maximum rating on SUP/SUPSW pins and internal clamp structures. During such events, the device maintains regulation down to 99% duty cycle and activates overvoltage protection if V_OUT exceeds 107% of setpoint. This behavior is validated in the MAX20003CATPB/V+ electrical characteristics table and typical operating curves.

What is the purpose of the SPS pin on the MAX20003CATPB/V+?

The SPS (Spread Spectrum) pin on the MAX20003CATPB/V+ enables ±3% triangular frequency modulation centered on the programmed FOSC frequency - reducing peak EMI emissions by spreading energy across a bandwidth. When pulled high, it activates internal dithering (110µs period at 2.2MHz); when low, it disables spread spectrum. The MAX20003CATPB/V+ automatically disables spread spectrum when synchronized to an external clock via FSYNC.

Can the MAX20003CATPB/V+ operate in dropout mode, and what is its minimum dropout voltage?

Yes, the MAX20003CATPB/V+ operates in dropout with up to 99% duty cycle, enabling regulation even when input voltage approaches output voltage. Minimum dropout is determined by high-side R_DS(on) (60–140mΩ) and load current: V_DROP ≈ I_LOAD × R_{ON_H}. At 3A and 140mΩ, dropout is ~420mV - sufficient for cold-crank (4.5V input) to sustain 3.3V output. This behavior is explicitly characterized in the MAX20003CATPB/V+ datasheet's "Maximum Duty-Cycle Operation" section.