Analog Devices Inc./Maxim Integrated MAX20031BATMD/V+T

Overview

MAX20031BATMD/V+T from Maxim Integrated is an automotive-grade dual synchronous step-down controller with integrated preboost circuit and high-voltage 200mA LDO, designed for front-end power management in cold-crank–capable systems. It delivers regulated 5V (Buck 1) and 3.3V (Buck 2) outputs, operates from 2V to 42V input, achieves 17µA quiescent current with Buck 1 enabled, and supports 2.2MHz switching up to 97% duty cycle - enabling compact, AM-band–immune designs for instrument clusters and head units.

For engineers reviewing the MAX20031BATMD/V+T datasheet, MAX20031BATMD/V+T pinout, MAX20031BATMD/V+T application, or MAX20031BATMD/V+T equivalent, key selection criteria include cold-crank operation down to 2V VIN, resistor-programmable 220kHz–2.2MHz switching frequency, spread-spectrum EMI reduction, thermally enhanced 48-pin TQFN package, and integrated protection including cycle-by-cycle current limit and thermal shutdown.

Technical Context

The MAX20031BATMD/V+T implements three independent current-mode controllers: two out-of-phase (180°) synchronous buck controllers (Buck 1/2), one synchronous boost (preboost) controller (Buck 3), and a standalone HV LDO (Buck 4). Each buck channel features programmable soft-start (3–8ms), 50ns minimum on-time, and ±3% output voltage accuracy over temperature.

Control logic includes three operating modes selectable via FSYNC: forced PWM, skip mode (ultra-low IQ), and external synchronization. The preboost activates below ~6V VIN to sustain Buck 1/2 regulation; the LDO supports 1.5V–10V adjustable output or factory-set 3.3V/5V, with 250mV dropout at 200mA.

Key Specifications

Pinout & Package

MAX20031BATMD/V+T is housed in a thermally enhanced 48-pin TQFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad (EP = GND). Pin assignments are validated per Maxim's official pin configuration diagram (Outline 21-0144, Land Pattern 90-0464).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail automotive power management applications.

Compared with MAX20030BATMD/V+T, the MAX20031BATMD/V+T adds precision EN3 threshold hysteresis for robust cold-crank detection, while MPQ4333GQ-AEC1 offers higher per-channel current but sacrifices integration - making MAX20031BATMD/V+T optimal for compact, crank-ready front-end designs requiring minimal external components.

Availability

MAX20031BATMD/V+T is available at Aetrix Electronics and suitable for instrument cluster, navigation head unit, and engine stop-start system applications requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for MAX20031BATMD/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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.

The MAX20031 is part of Maxim's automotive front-end power management portfolio, engineered specifically to replace discrete multi-IC power solutions in crank-capable ECUs - integrating dual buck, preboost, and HV LDO into a single AEC-Q100 Grade-0 package.

FAQ

What is the minimum input voltage supported by the MAX20031BATMD/V+T during cold-crank conditions?

The MAX20031BATMD/V+T supports operation down to 2V input voltage when the integrated preboost controller is enabled. This capability ensures continuous regulation of both Buck 1 (5V) and Buck 2 (3.3V) outputs during severe automotive cold-crank events, eliminating the need for external boost circuitry. The preboost activates automatically below ~6V VIN and sustains output stability without user intervention or additional control signals.

Does the MAX20031BATMD/V+T include built-in protection features, and which ones are implemented?

Yes, the MAX20031BATMD/V+T integrates multiple protection mechanisms: cycle-by-cycle current limiting on all three controllers (Buck 1/2/3), thermal shutdown at 170°C with 20°C hysteresis, input overvoltage and undervoltage lockout (UVLO at 2.35V BIAS fall), output overvoltage detection (109% nominal), and open-drain PGOOD monitoring for each buck output. These features reduce system-level fault-handling complexity and improve field reliability in harsh automotive environments.

Can the MAX20031BATMD/V+T generate adjustable output voltages, or is it limited to fixed 5V/3.3V rails?

The MAX20031BATMD/V+T supports both fixed and adjustable outputs. Buck 1 and Buck 2 can be configured for fixed 5V and 3.3V by connecting FB1/FB2 to BIAS, or for adjustable 1V–10V outputs using external resistor dividers. The LDO (OUT4) is factory-set to either 3.3V or 5V but supports 1.5V–10V adjustment via FB4 divider. All feedback nodes regulate to precise reference voltages (1.00V for bucks, 1.25V for LDO), ensuring accuracy across temperature and load.

How does the spread-spectrum feature of the MAX20031BATMD/V+T reduce EMI in sensitive radio bands?

The MAX20031BATMD/V+T's SPS pin enables ±6% frequency modulation of the switching frequency, spreading energy across a wider spectrum and reducing peak radiated emissions by >10dB. This feature is especially effective in AM band (0.53–1.71MHz) mitigation - allowing designers to meet CISPR 25 Class 5 requirements without adding shielding, ferrites, or complex filtering. Spread spectrum is pin-controllable and requires no configuration registers or firmware.

What package type and thermal characteristics does the MAX20031BATMD/V+T use?

The MAX20031BATMD/V+T uses a 48-pin TQFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad (EP = GND). Its thermal resistance is θJA = 23.3°C/W (on 4-layer board) and θJC = 1°C/W, enabling >3W continuous power dissipation at +70°C ambient. The package supports JEDEC-standard reflow profiles (peak 260°C) and is RoHS-compliant, with land pattern documented as #90-0464 on maximintegrated.com.