Analog Devices Inc./Maxim Integrated MAX20003ATPA/V+C2

Overview

The MAX20003ATPA/V+C2 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 regulated 3.3V or 5V output (±2% accuracy) with 15µA quiescent current in skip mode. It features resistor-programmable switching frequency (220kHz–2.2MHz), 99% maximum duty cycle for automotive cold-crank support, AEC-Q100 qualification, and 42V load-dump protection - deployed in automotive navigation units and point-of-load power rails.

For engineers reviewing the MAX20003ATPA/V+C2 datasheet, MAX20003ATPA/V+C2 pinout, MAX20003ATPA/V+C2 application, or MAX20003ATPA/V+C2 equivalent, key selection criteria include its 3A output capability, 20-pin TQFN package with exposed pad, fixed-frequency vs. skip-mode operation control via FSYNC, PGOOD monitoring, and spread-spectrum enablement via SPS pin for EMC optimization.

Technical Context

This device implements current-mode control with internal transconductance error amplifier (700µS), fixed 8ms soft-start, and cycle-by-cycle overcurrent protection. Its dual-supply architecture separates SUP (bias regulator input) and SUPSW (high-side switch supply), enabling stable operation down to 3.5V while maintaining regulation during undervoltage transients.

The IC supports three operational modes: forced PWM (via FSYNC tied to BIAS or external clock), skip mode (FSYNC to AGND), and synchronized operation (external clock within ±20% of internal frequency). Spread spectrum modulation (±3% around f_SW, triangular waveform, 110µs period at 2.2MHz) is enabled by pulling SPS high and disabled during external synchronization.

Key Specifications

Pinout & Package

The MAX20003ATPA/V+C2 is housed in a 5mm × 5mm, 20-pin TQFN package with exposed pad (EP), optimized for thermal dissipation in automotive under-hood environments. The exposed pad must be soldered to a large-area contiguous copper ground plane 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 synchronous buck converter applications.

Compared with LM61480RQR and TPS543B20RJNR, the MAX20003ATPA/V+C2 uniquely combines AEC-Q100 qualification, 42V load-dump tolerance, programmable spread spectrum, and 3.5V–36V operation - making it the only drop-in solution for automotive infotainment and ADAS power rails requiring full ISO 16750 compliance.

Availability

The MAX20003ATPA/V+C2 is available at Aetrix Electronics and suitable for automotive navigation units, ADAS camera modules, and body control modules requiring stable component supply across extended temperature and voltage stress conditions.

Supply support for MAX20003ATPA/V+C2 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, automotive, and communications applications.

The MAX20003 belongs to Maxim's automotive-grade power management portfolio, engineered specifically for harsh-automotive environments - emphasizing wide-input operation, transient robustness, low quiescent current, and AEC-Q100 compliance.

FAQ

What is the maximum output current rating of the MAX20003ATPA/V+C2?

The MAX20003ATPA/V+C2 is rated for 3A continuous output current under specified thermal conditions (θ_JA = 30°C/W on four-layer board, T_A ≤ +70°C). Its LX current limit is 3.75A (min), 5A (typ), and 6.25A (max), ensuring robust overload handling. Derating applies above +70°C ambient - consult thermal data in the datasheet for layout-specific derating curves. The MAX20003ATPA/V+C2 achieves this with integrated 60mΩ (typ) high-side and 35mΩ (typ) low-side MOSFETs.

Does the MAX20003ATPA/V+C2 support adjustable output voltages?

Yes, the MAX20003ATPA/V+C2 supports both fixed and adjustable outputs. Connect FB directly to BIAS for factory-trimmed 3.3V or 5V (±2% accuracy). For 1V–10V adjustment, use an external resistive divider from OUT to FB to AGND, leveraging the 1.00V ±1% internal reference (V_FB). The MAX20003ATPA/V+C2's feedback accuracy and line/load regulation (0.5%, 0.02%/V) ensure tight output stability across operating conditions.

How does the MAX20003ATPA/V+C2 handle automotive cold-crank conditions?

The MAX20003ATPA/V+C2 handles cold-crank by operating up to 99% duty cycle, sustaining regulation even when input drops to 3.5V. Its dual-supply architecture (SUP and SUPSW) maintains gate drive integrity during deep sags, while the internal bias regulator (V_BIAS = 5V ±5%) remains active down to 3.15V UVLO threshold. The MAX20003ATPA/V+C2's 15µA skip-mode IQ further minimizes battery drain during prolonged cranking - verified per ISO 16750-2.

What package type and thermal characteristics does the MAX20003ATPA/V+C2 use?

The MAX20003ATPA/V+C2 uses a 5mm × 5mm, 20-pin TQFN package with exposed pad (package code T2055+4C). Its thermal resistance is θ_JA = 30°C/W and θ_JC = 2°C/W on a four-layer JEDEC-standard board. The exposed pad must be soldered to a large PGND copper area - it is the primary heat path. Maximum junction temperature is +150°C, with thermal shutdown activating at +175°C (typ) and hysteresis of +15°C.

Can the MAX20003ATPA/V+C2 be synchronized to an external clock?

Yes, the MAX20003ATPA/V+C2 supports external synchronization via the FSYNC pin. When driven with a logic-level clock signal within ±20% of the internal oscillator frequency (e.g., 1.76–2.64MHz for a 2.2MHz setting), the device locks within two cycles. External clocks override internal spread spectrum. If the external clock stops for >2 cycles, the MAX20003ATPA/V+C2 automatically reverts to internal timing - ensuring fail-safe operation in noisy automotive environments.