MAX25232ATCB/V+

The MAX25232 is a small, synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver up to 3A with 3.5V to 36V input voltages while using only 3.5μA quiescent current at no load. The device provides an accurate output voltage of ±2% in FPWM mode within the normal 6V to 18V operation input range. With 65ns minimum on-time capability, the converter is capable of large input-to-output conversion ratios. Voltage quality can be monitored by observing the PGOOD signal. The device can operate in dropout by running at 99% duty cycle, making it ideal for automotive and industrial applications. The IC comes in fixed output voltage and adjustable output voltage (MAX25232ATCF and MAX25232ATCG only) options. For MAX25232ATCF and MAX25232ATCG, output voltage can be set between 3V and 10V using an external resistor-divider. Frequency is internally fixed at 2.1MHz, which allows for small external components and reduced output ripple, and guarantees no AM interference. A 400kHz option is also offered to provide minimum switching losses and maximum efficiency. The device automatically enters skip mode at light loads with ultra-low 3.5μA quiescent current at no load. The device offers pin-enabled spread-spectrum-frequency modulation designed to minimize EMI-radiated emissions due to the modulation frequency. The MAX25232 variants are available in a small (3mm x 3mm) 12-pin TDFN package with an exposed pad, and requires very few external components.

Applications

• Automotive
• Industrial High-Voltage DC-DC Converters

Key features

• Synchronous DC-DC Converter with Integrated FETs
• MAX25232ATCA/ATCB/ATCG/ATCH = 2.5A IOUT
• MAX25232ATCD/ATCE/ATCF = 3A IOUT
• 3.5μA Quiescent Current in Standby Mode
• Small Solution Size Saves Space
• 65ns Minimum On-Time
• 2.1MHz or 400kHz Operating Frequency
• Fixed 5V/3.3V Output Voltage with ±2% Output Accuracy in FPWM Mode (5V/3.3V)
• Other Fixed VOUT Options Between 3V - 5.5V (in 50mV steps) Available for Precise Output Voltage Setting
• External Resistor Divider Options to Adjust the Output Voltage Between 3V and 10V
• Fixed 3.5ms Internal Soft-Start
• Innovative Current-Mode-Control Architecture Minimizes Total Board Space and BOM Count
• PGOOD Output and High-Voltage EN Input Simplify Power Sequencing
• Protection Features and Operating Range Ideal for Automotive Applications
• 3.5V to 36V Operating VIN Range
• 40V Load-Dump Protection
• 99% Duty-Cycle Operation with Low Dropout
• -40°C to +125°C Automotive Temperature Range
• AEC-Q100 Qualified