Analog Devices Inc./Maxim Integrated MAX20003CATPA/V+T

Overview

MAX20003CATPA/V+T from Maxim Integrated is a 3A synchronous buck converter with integrated high-side and low-side MOSFETs, designed for automotive point-of-load regulation. It operates from 3.5V to 36V input, delivers fixed 5V/3.3V or adjustable 1V–10V output, achieves 99% duty cycle in dropout, and consumes only 15µA quiescent current in skip mode-enabling reliable power delivery in cold-crank and load-dump conditions.

For engineers reviewing the MAX20003CATPA/V+T datasheet, MAX20003CATPA/V+T pinout, MAX20003CATPA/V+T application, or MAX20003CATPA/V+T equivalent, this page provides verified technical context, AEC-Q100-qualified operating parameters, validated pin functions, automotive-grade protection features (42V load-dump, OVP, thermal shutdown), and confirmed alternatives for 3A DC-DC conversion in navigation units and distributed automotive power systems.

Technical Context

The MAX20003CATPA/V+T implements current-mode control with internal transconductance error amplifier (700µS), programmable oscillator (220kHz–2.2MHz via FOSC resistor), and dual-mode operation: forced PWM for EMI-sensitive systems and skip mode for ultra-low-noise, ultra-low-I_Q light-load performance. Its 99% max duty cycle enables stable 5V output even at 4.2V input during cold crank.

It integrates a 5V BIAS linear regulator (±2% accuracy, 4.7–5.4V output), open-drain PGOOD with 92.5–95% V_FB thresholds, spread-spectrum modulation (±3% frequency dither, 110µs period at 2.2MHz), and robust protection including cycle-by-cycle current limit (6.25A peak LX), overvoltage protection (107% V_OUT trip), and thermal shutdown (175°C, 15°C hysteresis).

Key Specifications

Pinout & Package

MAX20003CATPA/V+T is housed in a 5mm × 5mm, 20-pin TQFN package with exposed pad (EP), optimized for thermal dissipation in high-power-density automotive layouts. The exposed pad must be soldered to a large-area PGND copper plane but cannot serve as the sole ground connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3A automotive buck converter applications.

Compared with LM61480RQWR and TPS543B20RJNR, MAX20003CATPA/V+T uniquely combines AEC-Q100 Grade 1 qualification, 42V load-dump tolerance, integrated PGOOD, and programmable spread spectrum - making it the only drop-in solution for demanding automotive infotainment and ADAS point-of-load designs requiring single-chip reliability and EMC robustness.

Availability

MAX20003CATPA/V+T is available at Aetrix Electronics and suitable for automotive navigation head units, body control modules, and ADAS camera systems requiring stable component supply across extended temperature and voltage stress conditions.

Supply support for MAX20003CATPA/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 MAX20003 belongs to Maxim's automotive-qualified power management portfolio, engineered specifically for robust, compact, and low-quiescent-current DC-DC conversion in harsh vehicular environments.

FAQ

What is the maximum output current capability of the MAX20003CATPA/V+T?

The MAX20003CATPA/V+T is rated for 3A continuous output current under specified thermal conditions (θ_JA = 30°C/W on four-layer board). Its LX current limit is guaranteed at 3.75A (min) to 6.25A (max), enabling safe operation into short-circuit and transient overload conditions without latch-off. Derating is required above +70°C ambient per the 33.3mW/°C thermal derating curve.

Does the MAX20003CATPA/V+T support fixed 5V output without external resistors?

Yes, the MAX20003CATPA/V+T supports fixed 5V output by connecting the FB pin directly to the BIAS pin. This configuration leverages the internal 1V reference and achieves ±2% output accuracy across temperature and line/load variations. No external feedback resistors are needed, simplifying layout and reducing BOM count for standard 5V rail applications.

How does the MAX20003CATPA/V+T handle automotive cold-crank conditions?

The MAX20003CATPA/V+T handles cold-crank by operating up to 99% duty cycle, maintaining regulation even when input drops to 3.5V. Its dual-supply architecture (SUP and SUPSW) ensures internal bias remains active, and its 15µA skip-mode quiescent current minimizes battery drain during extended cranking. The device sustains 5V output at 3A down to ~4.2V input before entering dropout.

Is the MAX20003CATPA/V+T pin-compatible with other devices in the MAX20002/MAX20003 family?

No, the MAX20003CATPA/V+T is not pin-compatible with MAX20002 variants due to differing current-sense and protection thresholds, though it shares identical 20-pin TQFN package dimensions and pinout. However, it is functionally and physically compatible with MAX20003C/EATPA/V+, MAX20003C/EATPB/V+, and MAX20003CATPC/V+ - all share same pin mapping, thermal pad, and land pattern.

What protection features are integrated into the MAX20003CATPA/V+T?

The MAX20003CATPA/V+T integrates cycle-by-cycle current limiting (6.25A peak LX), overvoltage protection (107% V_OUT trip), thermal shutdown (175°C with 15°C hysteresis), 42V load-dump tolerance, and undervoltage lockout on BIAS (3.15V threshold). These protections operate autonomously without external components, ensuring robust operation in automotive transients and fault conditions.