MAX25223
Automotive 36V 3.5A Buck Converter with 3.5μA IQ
Best-in-Class, Ultra-Low IQ Buck Is Ideal for Automotive Applications
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Key Features
Applications/Uses
| VIN (V) (min) | 3 |
| VIN (V) (max) | 36 |
| VOUT1 (V) (min) | 3 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 3.5 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Adjustable Preset |
| Synchronous Switching? | Yes |
| Power Good Signal | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 2100 400 |
| Package/Pins | TQFN/20 |
| Budgetary Price (See Notes) | 0 |
Simplified Block Diagram
Technical Docs
| Data Sheet | Automotive 36V 3.5A Buck Converter with 3.5μA IQ | Jan 13, 2022 |
Support & Training
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Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
| VIN (V) (min) | 3 |
| VIN (V) (max) | 36 |
| VOUT1 (V) (min) | 3 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 3.5 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Adjustable Preset |
| Synchronous Switching? | Yes |
| Power Good Signal | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 2100 400 |
| Package/Pins | TQFN/20 |
| Budgetary Price (See Notes) | 0 |
Key Features
- Synchronous DC-DC Converter with Integrated FETs
- 3.5A Output-Current Capability
- 5μA Quiescent Current in Standby Mode
- Small Solution Size Saves Space
- 65ns Minimum On-Time
- 2.1MHz or 400kHz Fixed Operating Frequency Options
- Fixed 5V / 3.3V VOUT Options Available
- Fixed 3.5ms Internal Soft-Start
- Innovative Current-Mode-Control Architecture Minimizes Total Board Space and BOM Count
- PGOOD Output and High-Voltage EN Input Simplify Power Sequencing
- OV/UV Monitoring on PGOOD with High Accuracy
- Fully Programmable UVLO with Precise ENABLE Threshold
- Protection Features and Operating Range Ideal for Automotive Applications
- 3V to 36V Operating VIN Range
- 42V Load-Dump Protection
- Thermal Shutdown, Short Circuit Protection with Hiccup Mode and Output Overvoltage Protection
- 99% Duty-Cycle Operation with Low Dropout
- -40°C to +125°C Automotive Temperature Range
- AEC-Q100 Qualified
Applications/Uses
- Automotive
- Industrial
- High Voltage DC-DC Converters
Description
The MAX25223 is a small, automotive grade synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver up to 3.5A with input voltages from +3V to +36V while using only 5µA quiescent current at no load. The MAX25223 provides an accurate output voltage of ±2% within the normal operation input range of +6V to +18V. With 65ns minimum on-time capability, the converter is capable of large input-to-output conversion ratios. Voltage quality can be monitored by observing the PGOOD signal. MAX25223 can operate in drop-out by running at 99% duty cycle, making it ideal for automotive and industrial applications. The IC offers standard parts with fixed output voltages of 3.3V and 5V. Other fixed output voltages in the range of 3V to 5.5V are also available on request. Frequency is internally fixed at 2.1MHz, which allows for small external components, reduces output ripple, and guarantees that there is no AM interference. A 400kHz option is also offered to provide minimum switching losses and maximum efficiency. MAX25223 automatically enters skip mode at light loads with ultra-low quiescent current of 5µA at no load. It offers pin-enabled spread-spectrum frequency modulation designed to minimize EMI-radiated emissions due to the modulation frequency.
The MAX25223 comes in a small 4mm x 4mm 20-pin SW-TQFN package and uses very few external components. The intelligent package layout results in an extremely low-noise solution with superior EMI performance.
Technical Docs
| Data Sheet | Automotive 36V 3.5A Buck Converter with 3.5μA IQ | Jan 13, 2022 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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