Analog Devices / Maxim Integrated MAX17634x Synchronous Step-Down DC-DC Converter
Analog Devices Inc. MAX17634x Synchronous Step-Down DC-DC Converter has integrated MOSFETs and operates over an input-voltage range of 4.5V to 36V. It can deliver up to 4.25A current. The MAX17634x is available in three variants: MAX17634A, MAX17634B, and MAX17634C. The MAX17634A and MAX17634B are fixed 3.3V and 5V output voltage parts, respectively. The MAX17634C has an adjustable output voltage (from 0.9V up to 90% of the VIN). Built-in compensation across the output voltage range eliminates the need for external components.
The MAX17634x features peak-current-mode control architecture. The device can be operated in forced pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) to enable high efficiency under full-load and light-load conditions. The MAX17634x offers a low minimum on-time for high switching frequencies and smaller solution sizes. The feedback voltage regulation accuracy over -40°C to +125°C for the ADI MAX17634x Synchronous Step-Down DC-DC Converter is ±1.3%.
Features
- Reduces external components and total cost
- No Schottky–synchronous operation
- Internal compensation components
- All-ceramic capacitors, compact layout
- Reduces the number of DC-DC regulators to stock
- Wide 4.5V to 36V input
- Adjustable output range from 0.9V up to 90% of VIN
- 400kHz to 2.2MHz adjustable frequency with external synchronization
- Available in a 20-pin, 4mm x 4mm TQFN package
- Reduces power dissipation
- Peak efficiency of 94%
- PFM and DCM Modes enable enhanced light load efficiency
- Auxiliary bootstrap supply (EXTVCC) for improved efficiency
- 2.8μA shutdown current
- Operates reliably in adverse industrial environments
- Hiccup-mode overload protection
- Adjustable and monotonic startup with pre-biased output voltage
- Built-in output-voltage monitoring with RESET
- Programmable EN/UVLO threshold
- Overtemperature protection
- -40°C to +125°C ambient operating temperature range
- -40°C to +150°C junction temperature range
Applications
- Industrial control power supplies
- General-purpose Point-of-Load
- Distributed supply regulation
- Base station power supplies
- Wall transformer regulation
- High-voltage, single-board systems
Associated Development Tool
Analog Devices / Maxim Integrated MAX17634xEVKIT Converter Evaluation Kit
proven design to evaluate the MAX17634A (3.3V), MAX17634B (5V), or MAX17634C (5V) converters.
Functional Diagram
Published: 2019-12-03
| Updated: 2023-05-05