MAX42408 Datasheet

• High-Power DC/DC Converter in Small Solution Size
  • Operating V_IN range of 4.5V to 36V
  • Synchronous DC-DC Converter with Integrated FETs
  • 8A/10A Maximum Output Current
  • 400kHz and 1.5MHz Fixed Frequency Options
  • Fixed Soft-Start Time
    • 2.5ms for 400kHz
    • 3.5ms for 1.5MHz
  • 36ns Minimum On-Time
  • Programmable Output Voltage
    • 0.8V to 10V for 400kHz
    • 0.8V to 6V for 1.5MHz
  • Symmetric and Balanced SUP and PGND Pinout Placement for Better EMI Performance
  • Thermally-Enhanced 3.5mm x 3.75mm, 17-Pin FC2QFN Package
• High Efficiency at All Load Ranges
  • 20μA Quiescent Current in Skip Mode
  • Up to 95.6% Eff. at 12VIN/3.3VOUT/400kHz
  • Up to 93.9% Eff. at 12VIN/3.3VOUT/1.5MHz
• Dual-Phase Operation up to 20A Load Capability
  • Frequency Synchronization Input/Output
  • 180º Out-of-Phase Between Controller and Target
  • Dynamic Current Sharing
• Forced PWM and Skip-Mode Operation
• 99% Duty Cycle Operation with Low Dropout Voltage
• Power Good Indicator
• Overtemperature and Short-Circuit Protection
• -40°C to +125°C Temperature Range
• Scalable Power Solution
• Footprint Compatible with MAX42405/MAX42406

• Point-of-Load
• Industrial Automation
• Distributed DC Power Systems

The MAX42408 are highly-integrated synchronous buck converters with internal high-side and low-side switches. The ICs deliver up to 8A/10A with input voltage from 4.5V to 36V. The MAX42408 can operate in the dropout mode by running at very high duty cycle, which make them ideal for industrial applications.

The MAX42408 offer programmable output-voltage options. High switching frequency at 1.5MHz and 400kHz options allow for small external components and reduced output ripple. SYNC input programmability enables three modes for optimized performance: forced PWM mode, skip mode with ultra-low quiescent current, and synchronization to an external clock.

The MAX42408 also come with dual-phase capability, which allows up to 20A designs. Two ICs can be configured as a controller and target with dynamic current sharing and 180º out-of-phase operation.

The MAX42408 are available in a small 3.5mm x 3.75mm, 17-pin FC2QFN package. They are pin-to-pin compatible with the MAX42405/MAX42406 (5A to 6A) family of products.