MAX20472B
Low-Voltage Synchronous Boost Converter
Industry's Only Automotive Synchronous Boost Converter with Up to 1A of Output Current and True Shutdown and Active-Low RESET Output
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Key Features
Applications/Uses
| VIN (V) (min) | 3 |
| VIN (V) (max) | 4 |
| VOUT1 (V) (min) | 4.5 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 1 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset |
| Power Good Signal | Yes |
| Synchronous Switching? | Yes |
| Shutdown Mode Supply Current (µA) (typ) | 0.1 |
| Shutdown Mode Supply Current (µA) (max) | 2 |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 2200 |
| Design Tools | EE-Sim |
| Package/Pins | TDFN-CU/12 |
| Budgetary Price (See Notes) | 0.96 |
Simplified Block Diagram
Technical Docs
| Data Sheet | Low-Voltage Synchronous Boost Converter | Sep 24, 2021 |
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 .
Parameters
| VIN (V) (min) | 3 |
| VIN (V) (max) | 4 |
| VOUT1 (V) (min) | 4.5 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 1 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset |
| Power Good Signal | Yes |
| Synchronous Switching? | Yes |
| Shutdown Mode Supply Current (µA) (typ) | 0.1 |
| Shutdown Mode Supply Current (µA) (max) | 2 |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 2200 |
| Design Tools | generateDesignEESIMUrl('https://maxim.transim.com/pwm2/designreq/Index?partId=9718', '') |
| Package/Pins | TDFN-CU/12 |
| Budgetary Price (See Notes) | 0.96 |
Key Features
- Multiple Functions for Small Size
- Synchronous Boost Converter
- 3.8V to 5.25V Output in 50mV Steps
- 500mA and 1AOutput Versions
- 3V to 4V Operating Supply Voltage
- True Output Shutdown
- 2.2MHz Operation for the MAX20471, MAX20472
- 2.0MHz Operation for the MAX20472B
- Open-Drain Reset Output Pin (Active-Low RESET)
- Spread-Spectrum Enable Pin (SSEN)
- Synchronous Boost Converter
- High Precision
- ±1.5% Output-Voltage Accuracy
- 93V ±2% Undervoltage Monitoring
- 107V ±2% Overvoltage Monitoring
- Good Load-Transient Performance
- Robust for the Automotive Environment
- Current-Mode, Forced-PWM, and Skip Operation
- Overtemperature and Short-Circuit Protection
- 12-Pin (3mm × 3mm) TDFN
- 12-Pin (3mm × 3mm) SWTDFN
- 8-Pin (0.150”) SOIC (MAX20471 Only)
- -40°C to +125°C Automotive Temperature Range
Applications/Uses
- Automotive CAN Transceivers
- Automotive Point of Load
Description
The MAX20471, MAX20472, and MAX20472B are high-efficiency low-voltage DC-DC converters that boost a 3.0V to 4.0V input supply to between 3.8V and 5.25V (factory-configurable) at 500mA or 1A. The boost converters achieve ±1.5% output error over load, line, and temperature range.
The devices feature a 2.2MHz (2.0MHz for MAX20472B) fixed-frequency PWM mode for better noise immunity and load-transient response, and a pulse-frequency modulation mode (skip) for increased efficiency during light-load operation. The 2.2MHz/2.0MHz frequency operation allows for the use of all ceramic capacitors and minimizes external components. The programmable spread-spectrum frequency modulation minimizes radiated electromagnetic emissions. Integrated low RDS(ON) switches improve efficiency at heavy loads, which make the layout a much simpler task with respect to discrete solutions.
Other features include true shutdown, soft-start, overcurrent, and overtemperature protections.
Technical Docs
| Data Sheet | Low-Voltage Synchronous Boost Converter | Sep 24, 2021 |
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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