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Maxim has introduced the MAX25240AFFD/VY 2V to 36V, 6A step-up converter, which is suitable for automotive applications.

1. Instructions

The MAX25240AFFD/VY is one of the industry's few 6A automotive step-boost converters with integrated H-bridge switches. The IC supports continuous load currents up to 6A, depending on the input-output voltage ratio and operating frequency. It also supports a wide input voltage range from 2V to 36V.

The MAX25240 offers three switching frequency options: 2.1MHz, 400kHz, and 200kHz. At a high switching frequency of 2.1MHz, the number of external components required is small, the output ripple is low, and no AM band interference is guaranteed, while a 400kHz or 200kHz switching frequency helps to improve efficiency and alleviate power consumption issues. The SYNC input supports three operating modes: Skip mode with low static current, forced fixed-frequency PWM operation, and synchronization with an external clock. The IC also offers spread spectrum modulation capability to minimize EMI interference.

The MAX25240 features a power status (POK) indicator, undervoltage protection, overvoltage protection, cycle term current and thermal shutdown.

2. Functional block diagram

3. Features

Meet stringent automotive quality and reliability requirements

The input working voltage ranges from 2V to 36V, and supports cold start operation

Withstand input transient voltages up to 42V

EN pin compatible up to 42V

Input current limit: 8.2A/10A (typical)

Fixed and adjustable output voltage options

-40°C to +125°C Class 1 automotive application temperature range

The AEC-Q100 certified highly integrated and heat-enhanced package reduces BOM costs and board space

Integrated FET H-bridge architecture

2.1MHz/400kHz/200kHz switching frequency option

Phase locked loop (PLL) frequency synchronization

Available in a heat-enhanced 22-pin FC2QFN package

Low static current to meet stringent OEM current requirements

Static current in standby mode: 95μA

Turn-off current: 10μA (Max)

EMI emissions are reduced at switching frequencies

Enable/disable spread spectrum via SPS pins

The protection function improves system reliability

Power undervoltage protection and thermal protection

Provides output PGOOD indicator, overvoltage and short circuit protection

4. Application

ADAS ECU

Body electronics

Infotainment system

Point-of-load power supply

Start-stop system