Analog Devices Inc./Maxim Integrated MAX20003CATPD/V+T

Overview

MAX20003CATPD/V+T 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, 2.2MHz programmable switching frequency (via FOSC resistor), and AEC-Q100 qualification for automotive point-of-load regulation.

For engineers reviewing the MAX20003CATPD/V+T datasheet, MAX20003CATPD/V+T pinout, MAX20003CATPD/V+T application, or MAX20003CATPD/V+T equivalent, key selection criteria include its 99% dropout capability, ±1% FB accuracy for adjustable outputs, 42V load-dump protection, and spread-spectrum enablement via SPS pin for EMC-sensitive automotive systems.

Technical Context

This current-mode buck regulator integrates dual MOSFETs and a 5V BIAS LDO to power internal circuitry. Its control loop uses an external COMP node with transconductance g_M = 700µS and supports both forced PWM (via FSYNC) and ultra-low-I_Q skip mode - selected by logic level on FSYNC.

It implements cycle-by-cycle current limiting (5A typical LX limit), thermal shutdown at 175°C with 15°C hysteresis, and fast overvoltage protection triggered at 107% V_FB. The PGOOD output asserts at 95% V_FB with 25µs debounce and open-drain drive capability up to 5mA.

Key Specifications

Pinout & Package

MAX20003CATPD/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 PCBs. The EP must be soldered to a large-area PGND copper plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480RQR and MPQ4436AGL-AEC1-Z, MAX20003CATPD/V+T uniquely combines integrated BIAS LDO, spread-spectrum control, and 42V load-dump tolerance - reducing bill-of-materials and simplifying automotive power architecture design.

Availability

MAX20003CATPD/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS domain controllers, and telematics control units requiring stable component supply across long production lifecycles.

Supply support for MAX20003CATPD/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.

MAX20003 belongs to Maxim's automotive-grade power management portfolio, engineered specifically for harsh-environment DC-DC conversion in vehicles - emphasizing AEC-Q100 compliance, wide VIN range, and robust transient protection.

FAQ

What is the maximum output current capability of the MAX20003CATPD/V+T?

The MAX20003CATPD/V+T delivers up to 3A continuous output current under thermal and layout-optimized conditions. Its LX current limit is specified at 5A (typical), and the device includes cycle-by-cycle current limiting and thermal shutdown to protect against overload. Derating applies above +70°C ambient per the 30°C/W θ_JA specification.

Does the MAX20003CATPD/V+T support adjustable output voltage?

Yes, the MAX20003CATPD/V+T supports both fixed and adjustable outputs. Connecting FB directly to BIAS yields fixed 5V or 3.3V. For 1V–10V adjustment, use an external resistive divider from OUT to FB to AGND, leveraging the ±1% accurate 1V feedback reference (V_FB = 0.99–1.01V).

How does the spread-spectrum feature work on the MAX20003CATPD/V+T?

The MAX20003CATPD/V+T enables spread-spectrum modulation via the SPS pin: pulling SPS high activates ±3% triangular frequency dithering centered on the programmed f_SW (e.g., 2.2MHz ±66kHz). The modulation period scales inversely with f_SW; at 400kHz, it extends to 550µs. This reduces EMI peak amplitudes without affecting average frequency or regulation.

What protection features are integrated into the MAX20003CATPD/V+T?

The MAX20003CATPD/V+T integrates 42V load-dump survival, cycle-by-cycle current limiting (5A typical), overvoltage protection at 107% V_FB, thermal shutdown at 175°C (with 15°C hysteresis), and undervoltage lockout on BIAS (2.9–3.4V). These meet ISO 7637-2 pulse 5a/b requirements and support AEC-Q100 Grade 1 operation.

Is the MAX20003CATPD/V+T pin-compatible with other devices in the MAX2000x family?

The MAX20003CATPD/V+T shares identical 20-pin TQFN packaging and pinout with MAX20002 variants (e.g., MAX20002CATPA/V+T), enabling drop-in replacement where 3A output is required instead of 2A. However, LX current limit, R_ON values, and certain protection thresholds differ - full validation is recommended before substitution.