General Description
The MAX42405/MAX42406 ICs are tiny synchronous buck converters with integrated high-side and low-side switches. The ICs are designed to deliver up to 6A with wide input voltages ranging from 4.5V to 36V. Voltage quality can be monitored by observing the PGOOD signal. The ICs can operate in dropout by running at a 99% duty cycle, making it ideal for industrial applications.
The MAX42405/MAX42406 offer programmable voltage ranges from 0.8V to 10V. Frequency is internally fixed at 400kHz and 1.5MHz, which allows for small external components and reduced output ripple. The ICs automatically enter skip mode at light loads with ultra-low quiescent current of 10μA at no load. This family of products (including the MAX42408/MAX42410) offers a pin-to-pin compatible offering from 5A to 10A in a single-phase configuration, and up to 20A in a dual-phase configuration. These devices have also been optimized for dual-phase operation with very high current-sharing accuracy.
The MAX42405/MAX42406 are available in a small 3.5mm x 3.75mm, 17-pin Flip-Chip Quad Flat No lead (FC2QFN) package and use very few external components.

Benefits and Features
• Multiple Functions for Small Size
• Operating VIN Range of 4.5V to 36V
• 10μA Quiescent Current in Skip Mode
• Synchronous DC-DC Converter with Integrated Field-Effect Transistors (FETs)
• 400kHz and 1.5MHz Fixed-Frequency Options
• Internal Soft-Start
- 2.5ms for 400kHz
- 3.5ms for 1.5MHz
• Programmable 0.8V to 10V Output
• 3.5mm x 3.75mm, 17-Pin FC2QFN
• Symmetrical Package Offers Superior Electromagnetic interference (EMI) Performance
• Dual Phase Capability
• Can Be Used in Dual-Phase Configuration for High-Power Design
• Dynamic Current Sharing through Shared VEA Pin
• Low-IQ Operation Capability in Dual Phase
• Precise Output Voltage Monitoring with PGOOD
• Forced–Pulse-Width modulation (PWM) and Skip-Mode Operation
• 99% Duty-Cycle Operation with Low Dropout
• Overtemperature and Short-Circuit Protection
• -40°C to +125°C Operating Temperature Range

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