MAX20446C
Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and Hybrid Dimming
6-Channel 130mA LED Driver Provides Full Diagnostics and Hybrid Dimming
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Key Features
Applications/Uses
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 42 |
| Max. No. of LEDs | 80 |
| # LED Channels | 6 |
| LED Configuration | Series-Parallel |
| ILED per Channel (A) (max) | 0.13 |
| PWM Dimming Freq. (kHz) (max) | 2 |
| Dimming Ratio (max) | 20000 |
| Dimming Control | PWM |
| POUT (W) | 40 |
| LED String Volt. (V) (max) | 52 |
| Switching Frequency (kHz) | 2200 |
| Package/Pins | TQFN-CU/24 |
| Budgetary Price (See Notes) | 2.92 |
Simplified Block Diagram
Technical Docs
| Data Sheet | Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and Hybrid Dimming | May 07, 2021 | |
| solution | LED Driver for Automotive Display Applications |
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) | 4.5 |
| VIN (V) (max) | 42 |
| Max. No. of LEDs | 80 |
| # LED Channels | 6 |
| LED Configuration | Series-Parallel |
| ILED per Channel (A) (max) | 0.13 |
| PWM Dimming Freq. (kHz) (max) | 2 |
| Dimming Ratio (max) | 20000 |
| Dimming Control | PWM |
| POUT (W) | 40 |
| LED String Volt. (V) (max) | 52 |
| Switching Frequency (kHz) | 2200 |
| Package/Pins | TQFN-CU/24 |
| Budgetary Price (See Notes) | 2.92 |
Key Features
- Wide-Voltage-Range Operation
- Operates Down to 4V Supply After Startup
- Survives Load Dump Up to 52V
- High Integration
- Complete 6-Channel Solution Including Boost Controller
- All Settings Performed with External Components, No Need for Microcontroller Intervention
- Robust and Low EMI
- Spread-Spectrum Oscillator
- Phase Shifting
- 400kHz to 2.2MHz Switching-Frequency Range
- Versatile Dimming Scheme Allows Hybrid or PWM Dimming
- Dimming Ratio > 10000:1 Using Hybrid Dimming
- 10000:1 Dimming Ratio at 200Hz using PWM Dimming
- Complete Fault Protection
- LED Open/Short Detection and Protection
- Boost Output Undervoltage and Overvoltage
- Thermal Shutdown
- Compact (4mm x 4mm) 24-Pin TQFN Package
Applications/Uses
- Central Information Displays
- Infotainment Displays
- Instrument Clusters
Description
The MAX20446 is a 6-channel backlight driver with boost controller for automotive displays. The integrated current outputs can sink up to 130mA LED current each. The device accepts a wide 4.5V to 36V input voltage range and withstands direct automotive load-dump events.
The internal current-mode switching DC-DC controller supports boost or SEPIC topologies and operates in the frequency range 400kHz to 2.2MHz. Integrated spread spectrum helps reduce EMI. An adaptive output-voltage control scheme minimizes power dissipation in the LED current-sink paths.
The device features pulse-width modulation (PWM) dimming and hybrid dimming. In either case the minimum pulse width is 500ns. Phase-shifted dimming of the strings is incorporated for lower EMI.
The MAX20446C is exceptionally easy to configure using a single resistor on the SET pin.
The device is available in a 24-pin TQFN package and operates over the -40 to +125°C temperature range.
Technical Docs
| Data Sheet | Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and Hybrid Dimming | May 07, 2021 | |
| solution | LED Driver for Automotive Display Applications |
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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