General Description
The MAX42408/MAX42410 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 voltage quality can be monitored by the PGOOD signal. The MAX42408/MAX42410 can operate in the dropout mode by running at 99% duty cycle, which make them ideal for industrial applications.
The MAX42408/MAX42410 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/MAX42410 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/MAX42410 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.

Benefits and Features
• High-Power DC/DC Converter in Small Solution Size
• Operating VIN 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
• 34ns 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
• 10μA 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

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