Analog Devices Inc./Maxim Integrated MAX20030BATMB/V+T

Overview

MAX20030BATMB/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 and 3.3V outputs (±1% FB accuracy), operates from 2V to 42V input (with preboost), supports 2.2MHz switching, and achieves 17µA quiescent current with only the 3.3V buck enabled - enabling always-on instrument cluster and head-unit power supplies.

For engineers reviewing the MAX20030BATMB/V+T datasheet, MAX20030BATMB/V+T pinout, MAX20030BATMB/V+T application, or MAX20030BATMB/V+T equivalent, key selection considerations include its 48-pin TQFN package, 180° out-of-phase dual-buck operation, resistor-programmable frequency (220kHz–2.2MHz), spread-spectrum EMI reduction, and crank-ready preboost functionality down to 2V battery input.

Technical Context

The MAX20030BATMB/V+T 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 sustain VOUT1/VOUT2 regulation. Its preboost architecture uses CS3P/CS3N sensing, TERM-switched feedback, and BSTON status reporting to enable seamless transition during automotive cold-crank events.

Control logic includes three selectable PWM modes (forced fixed-frequency, skip mode for ultra-low IQ, and external sync via FSYNC), plus pin-selectable spread spectrum (SPS) for EMI suppression. The integrated 5V BIAS LDO powers internal circuitry and external gate drivers, while the HV LDO (OUT4) provides a programmable 3.3V/5V output with 250mV dropout at 200mA and ±1.5% total output voltage accuracy over temperature.

Key Specifications

Pinout & Package

MAX20030BATMB/V+T is housed in a thermally enhanced 7mm × 7mm, 48-pin TQFN package with exposed pad (EP = GND). The package supports high-power dissipation (θJA = 23.3°C/W on 4-layer board) and meets AEC-Q100 Grade 0 requirements for automotive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20031BATMB/V+T, the MAX20030BATMB/V+T offers slightly lower CDM ESD tolerance but identical electrical performance and pinout; versus TPS65381A-Q1, it adds essential preboost and spread-spectrum features for stringent automotive EMI and cranking requirements - making it the only option supporting full ASIL-B-compliant front-end power in harsh battery environments.

Availability

MAX20030BATMB/V+T is available at Aetrix Electronics and suitable for instrument cluster, navigation head unit, and distributed DC power systems requiring stable component supply across extended automotive temperature and voltage ranges.

Supply support for MAX20030BATMB/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 MAX20030/MAX20031 product line delivers complete front-end power solutions for automotive ECUs - integrating dual buck, preboost, and HV LDO to replace discrete power trees while meeting AEC-Q100 Grade 0 and CISPR 25 EMI requirements.

FAQ

What is the minimum input voltage supported by MAX20030BATMB/V+T during cold-crank operation?

The MAX20030BATMB/V+T supports input voltages as low as 2V when the preboost controller is enabled. This capability is achieved through the integrated synchronous boost circuit (controlled by EN3, monitored via BSTON and TERM), which maintains regulation of both buck outputs (VOUT1 and VOUT2) even during severe automotive cold-crank events - a key differentiator from standard buck-only controllers.

Does MAX20030BATMB/V+T support external clock synchronization, and what is the valid FSYNC frequency range?

Yes, MAX20030BATMB/V+T supports external clock synchronization via the FSYNC pin. With RFOSC = 12kΩ, the valid FSYNC range is 1.8MHz to 2.6MHz; with RFOSC = 70kΩ, it extends to 250kHz to 550kHz. The device locks to the external clock with 1:1 ratio and requires ≥150ns sync pulses - enabling precise EMI alignment in multi-rail systems.

How is the output voltage of the integrated LDO (OUT4) configured on MAX20030BATMB/V+T?

The LDO output voltage on MAX20030BATMB/V+T is factory-configured as either 5V or 3.3V - the "B" suffix in MAX20030BATMB/V+T indicates the 3.3V LDO variant. Output voltage is set by internal resistor divider; FB4 is used only for external adjustment in custom variants. The LDO delivers up to 200mA with 250mV dropout at rated load and ±1.5% total accuracy over temperature and line.

What thermal management features does MAX20030BATMB/V+T provide to ensure reliability in under-hood applications?

MAX20030BATMB/V+T includes thermal shutdown at 170°C with 20°C hysteresis, and is packaged in a 7mm × 7mm TQFN with exposed pad (EP = GND) for low thermal resistance (θJC = 1°C/W). On a 4-layer board, θJA is 23.3°C/W - enabling >2.9W continuous dissipation at +70°C ambient. Layout best practices include connecting EP directly to a large ground plane and separating AGND/PGND planes.

Can MAX20030BATMB/V+T operate in skip mode, and how is it enabled?

Yes, MAX20030BATMB/V+T supports ultralow-IQ skip mode for light-load efficiency. Skip mode is automatically engaged when the FSYNC pin is left floating or pulled low (logic 0), and forced fixed-frequency PWM is selected by pulling FSYNC high. In skip mode, the device achieves 25µA IQ with 5V buck enabled and 17µA IQ with only the 3.3V buck active - critical for battery-backed systems.