Analog Devices Inc. MAX17639 Synchronous Step-Down DC-DC Converters
Analog Devices MAX17639 Synchronous Step-Down DC-DC Converters are high‑efficiency, high‑voltage devices designed to deliver robust performance across a wide range of industrial and distributed power applications. The ADI MAX17639 delivers continuous output currents of up to 10A with additional supporting peak currents up to 12A. These converters generate adjustable output voltages from 0.6V to as high as 90% of the input voltage.
An included MODE/SYNC pin enables configuration for forced PWM or switching‑frequency‑modulation (SFM) operation and allows synchronization to an external clock. The EN/UVLO pin provides programmable input undervoltage lockout thresholds for controlled turn‑on and turn‑off behavior, while the soft‑start (SS) pin helps limit inrush current during startup. A RESET/TJ pin is also available to monitor output‑voltage status or directly measure die temperature, improving reliability by providing real‑time thermal insight rather than relying solely on estimated junction temperatures.
Features
- Designed for ultra-high efficiency
- 22mΩ/8mΩ RDS-ON power MOSFETs
- 94.9% efficiency from 24VIN to 5VOUT, 10A with 95.6% peak efficiency at 6A
- External bias input for improved efficiency
- 40μA IQ regulating 24VIN to 3.3VOUT
- 10A maximum continuous, 12A peak transient output
- Die temperature monitoring
- Designed for low EMI
- Symmetrical input voltage pins
- 400kHz to 2.2MHz adjustable switching frequency with external clock synchronization
- 4mm x 4mm 18-FC2QFN package
- Reduces external components and total cost
- No Schottky-synchronous operation
- Adjustable output range from 0.6V to 90% of VIN
- Programmable soft-start and EN/UVLO threshold
- Operates reliably in adverse industrial environments
- Built-in hiccup-mode overload protection
- Built-in output-voltage status monitoring and die temperature monitoring with RESET/TJ pin
- -40°C to +125°C ambient temperature range
- -40°C to +150°C junction temperature range
- Lead-free and RoHS-compliant
Applications
- Factory and building automation
- Distributed DC power systems
- General-purpose power supplies
Specifications
- 3V to 36V input voltage range
- 5.35μA to 40μA maximum input shutdown current range
- Input UVLO
- 2.7V to 2.9V rising range
- 2.58V to 2.78V falling range
- 4.4μA to 5.3μA soft-start charging current range
- 375kHz to 2420kHz switching frequency range
- 130ms typical hiccup timeout
- 4210mW maximum continuous power dissipation
- +175°C typical thermal shutdown threshold
- 10°C typical thermal shutdown hysteresis
Simplified Application Diagram
Functional Block Diagram
