Analog Devices' MAX25239 and MAX25240 are automotive grade 2 V to 36 V, 4 A and 6 A elevating voltage converters

ADI's MAX25239 and MAX25240 are small synchronous step-boost converters with integrated H-bridge switches. These ics provide a fixed output regulation voltage and an externally adjustable output voltage in the range 3 V to 20 V, with the input voltage above, below, or equal to the output regulation voltage. With typical 8.2A and 10 A input current-limiting options, the IC can support continuous load current up to 6 A, depending on input-output voltage ratio and operating frequency, and has a wide input voltage range of 2 V to 36 V.

The MAX25239 and MAX25240 have three switching frequency options: 2.1 MHz, 400 kHz, and 200 kHz. The high switching frequency of 2.1 MHz allows the use of smaller external components and reduces the output ripple, ensuring no AM band interference; The 400 kHz and 200 kHz switching frequencies provide higher efficiency and alleviate power consumption problems. The SYNC input allows three modes of operation: frequency-hopping mode with ultra-low static current, forced fixed-frequency PWM operation, and synchronization with an external clock. The IC also includes spread spectrum frequency modulation to minimize electromagnetic interference (EMI).

The MAX25239 and MAX25240 feature power supply normal (POK) indicators, undervoltage locking, overvoltage protection, cycle term current, and thermal shutdown features. These ics come in a small 4.25mm x 4.25mm x 0.75mm 22-pin FC2QFN package.

The MAX25240 Evaluation Kit (MAX25240EVKIT#) is a fully assembled and tested application circuit that simplifies the evaluation of the MAX25240 400 kHz 36 V converter. All components are installed within the vehicle temperature range. Various test points and jumpers for evaluation are included.

The standard evaluation kit is installed with the MAX25240AFFF/VY+ (11.5V, 400 kHz) and can also be used to evaluate other MAX25240 variants with minimal changes to the components listed in the MAX25240 Evaluation Kit Bill of Materials (BOM)

Features

● Meet stringent vehicle quality and reliability requirements
-   The 2 V to 36 V operating input voltage range allows operation under cold start conditions
-   Allows input transients up to 42 V
-   EN pin compatible up to 42 V
-   8.2 Typical A/10 A Input Current Limiting
-   Constant and adjustable output voltage
-   Class 1 Automotive temperature range from -40°C to +125°C
● High integration and heat resistant enhanced packaging in accordance with the AEC-Q100 standard reduces BOM costs and reduces board space
-   Integrated FET H bridge architecture
-   2.1 MHz, 400 kHz, and 200 kHz switching frequency options
-   Phase locked loop (PLL) frequency synchronization
-   Heat enhanced 22 pin FC2QFN package
● Low static current meets strict OEM current requirements
-   Static current of 95 μA in standby mode
-   10 μA maximum turn-off current
● Reduce EMI radiation at switching frequency
-   Enable/disable spread spectrum via SPS pins
● The protection feature improves system reliability
-   Power undervoltage lock and thermal protection
-   Output PGOOD indicator, over voltage, short circuit protection

Applications

● ADAS ECU
● Infotainment system
● Body electronics
● Start-stop system
● Point-of-load power supply
● Start-stop system
● Point-of-load power supply