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