General Description

The MAX25239/MAX25240 are small, synchronous, buckboost

converters with integrated H-bridge switches. These

ICs provide a fixed-output regulation voltage and an externally

adjustable output voltage in the 3V to 20V range

with an input voltage above, below, or equal to the output

regulation voltage. The IC has typical 8.2A and 10A input

current limit options and can support continuous load currents

up to 6A depending on the input-to-output voltage

ratio and operating frequency. It also has a wide input voltage

range of 2V to 36V.

The MAX25239/MAX25240 have three switching frequency

options: 2.1MHz, 400kHz, and 200kHz. The 2.1MHz

high switching frequency allows small external components

and reduced output ripple, and guarantees no AM

band interference, while the 400kHz or 200kHz switching

frequency offers better efficiency and relieves the power

consumption concern. The SYNC input allows three operation

modes: skip mode with ultra-low quiescent current,

forced fixed-frequency PWM operation, and synchronization

to an external clock. The IC also includes spreadspectrum

frequency modulation to minimize EMI interference.

The MAX25239/MAX25240 feature a power-OK (POK) indicator,

undervoltage lockout, overvoltage protection, cycle-

by-cycle current limit, and thermal shutdown. The ICs

are available in a small, 4.25mm x 4.25mm x 0.75mm,

22-pin FC2QFN package.

Benefits and Features

● Meets Stringent Automotive Quality and Reliability

Requirements

• 2V to 36 Operating Input Voltage Range Allows

Operation in Cold-Crank Conditions

• Tolerates Input Transients up to 42V

• EN Pin Compatible up to 42V

• 8.2A/10A Typical Input Current Limit

• Fixed and Adjustable Output Voltage Options

• -40°C to +125°C Grade 1 Automotive Temperature

Range

● AEC-Q100 Qualified High Integration and Thermally

Enhanced Package Reduces BOM Cost and Board

Space

• Integrated FETs H-Bridge Architecture

• 2.1MHz/400kHz/200kHz Switching Frequency

Options

• Phase-Locked Loop (PLL) Frequency

Synchronization

• Thermally Enhanced, 22-Pin FC2QFN Package

● Low Quiescent Current Meets Stringent OEM Current

Requirements

• 95μA Quiescent Current in Standby Mode

• 10μA Maximum Shutdown Current

● Reduced EMI Emissions at Switching Frequency

• Spread-Spectrum Function Enabled/Disabled by

SPS Pin

● Protection Features Improve System Reliability

• Supply Undervoltage Lockout and Thermal

Protection

• Output PGOOD Indicator, Overvoltage, and Short-

Circuit Protection

Applications

● ADAS ECU

● Infotainment Systems

● Body Electronics

● Start-Stop Systems

● Point-of-Load Power Supplies