Analog Devices Inc./Maxim Integrated MAX20031BATME/V+

Overview

MAX20031BATME/V+ 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 and stop-start automotive systems. It delivers regulated 5V (Buck1) and 3.3V (Buck2) outputs, supports input down to 2V via preboost, operates up to 2.2MHz, and features 17µA quiescent current with Buck1 enabled - enabling ultra-low-power always-on domains in instrument clusters and head units.

For engineers reviewing the MAX20031BATME/V+ datasheet, MAX20031BATME/V+ pinout, MAX20031BATME/V+ application, or MAX20031BATME/V+ equivalent, key selection considerations include its 48-pin TQFN package, resistor-programmable switching frequency (220kHz–2.2MHz), spread-spectrum EMI reduction, dual-phase 180° out-of-phase operation, and integrated crank-ready preboost functionality for sustained regulation during 2V battery dips.

Technical Context

The MAX20031BATME/V+ implements three independent current-mode controllers: two 2.2MHz synchronous buck converters operating 180° out of phase to reduce input ripple, and a dedicated synchronous boost controller activated below ~6V input to maintain VOUT1/VOUT2 regulation down to 2V. Its architecture includes separate COMP pins per channel, programmable soft-start (3–8ms), and cycle-by-cycle current limiting with 68–92mV CS threshold.

Control logic integrates three frequency modes - forced PWM, skip mode (25µA IQ), and external sync - selectable via FSYNC and FOSC pins; spread spectrum modulation is enabled by SPS pin. The device uses thermally enhanced 7mm × 7mm 48-pin TQFN with exposed pad, achieving θJA = 23.3°C/W on four-layer board and thermal shutdown at 170°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MAX20031BATME/V+ is housed in a thermally enhanced 7mm × 7mm, 48-pin TQFN package with exposed pad (EP = GND). The package supports high-power dissipation (2963mW at +70°C) and achieves θJC = 1°C/W for efficient heat transfer to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20030BATME/V+, the MAX20031BATME/V+ adds precision active-low EN3 for hardware-triggered preboost activation during battery dip, while TPS65321A-Q1 offers TI's C2000 ecosystem integration but requires external components to match MAX20031's crank-ready capability and EMI performance.

Availability

MAX20031BATME/V+ is available at Aetrix Electronics and suitable for automotive instrument clusters, navigation head units, and distributed DC power systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX20031BATME/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) is a leader in high-performance analog, mixed-signal, and power management ICs, serving automotive, industrial, and communications markets with AEC-Q100-qualified solutions.

The MAX20030/MAX20031 product line was engineered specifically for automotive front-end power conversion - integrating dual buck, preboost, and LDO functions into a single thermally optimized package to simplify design of crank-ready, low-EMI power trees.

FAQ

What is the minimum input voltage supported by MAX20031BATME/V+ during cold-crank conditions?

The MAX20031BATME/V+ supports operation down to 2V input when the integrated preboost controller is enabled - maintaining regulated 5V and 3.3V outputs throughout automotive cold-crank events. This capability eliminates the need for external boost circuitry and ensures uninterrupted power to critical subsystems like instrument clusters and head units.

Does MAX20031BATME/V+ support synchronization to an external clock source?

Yes, MAX20031BATME/V+ supports external clock synchronization via the FSYNC pin, accepting input frequencies from 250kHz to 2.6MHz depending on RFOSC setting. This allows precise timing alignment with system clocks or other power stages to reduce beat-frequency noise and simplify EMI filtering in complex automotive ECUs.

How does the spread-spectrum feature of MAX20031BATME/V+ reduce EMI?

The MAX20031BATME/V+ implements ±6% frequency modulation on its switching clock when the SPS pin is pulled high. This spreads energy across a wider bandwidth, reducing peak radiated emissions by >10dB in the 150kHz–108MHz range - directly addressing FM radio band sensitivity in infotainment systems without degrading transient response or efficiency.

What is the thermal performance of MAX20031BATME/V+ on a standard PCB?

On a four-layer board, MAX20031BATME/V+ achieves a junction-to-ambient thermal resistance (θJA) of 23.3°C/W and junction-to-case (θJC) of 1°C/W. With its exposed pad soldered to a solid ground plane, the device safely dissipates up to 2963mW at +70°C ambient - supporting high-current operation in under-hood environments up to +125°C.

Can MAX20031BATME/V+ generate adjustable output voltages beyond the default 5V and 3.3V rails?

Yes, MAX20031BATME/V+ supports adjustable outputs: Buck1 and Buck2 can be set from 1V to 10V using external feedback dividers on FB1/FB2; the LDO (OUT4) is factory-configurable for 5V or 3.3V, and further adjustable from 1.5V to 10V via FB4 divider. All feedback pins regulate to precise reference voltages (1.00V or 1.25V) with ±1% accuracy over temperature.