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