36V, 5A/6A Fully Integrated Synchronous
Buck Converters
MAX42405/MAX42406
General Description
Benefits and Features
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
very high duty cycle, making it ideal for industrial
applications.
•
Multiple Functions for Small Size
• Operating VIN Range of 4.5V to 36V
• 20μA 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
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.
•
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
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.
•
•
Precise Output Voltage Monitoring with PGOOD
Forced–Pulse-Width modulation (PWM) and
Skip-Mode Operation
•
•
•
Low Dropout Operation
Overtemperature and Short-Circuit Protection
-40°C to +125°C Operating Temperature Range
Applications
•
•
•
Industrial Automation
Point-of-Load
Distributed DC Power Systems
Ordering Information appears at end of data sheet.
19-101745; Rev 1; 12/23
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