- MPQ7231
MPQ7231
MPSafeTM 42V, 3A Buck or 2.4A Buck-Boost, Synchronous Infrared LED Driver, AEC-Q100 Qualified
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Description
The MPQ7231 is a fixed-frequency, constant current, infrared (IR) LED driver with integrated eye safety features. The device operates across a 6V to 42V input voltage (VIN) range. It can be configured to either buck or buck-boost mode, and achieve up to 3A and 2.4A of peak current (ILED_PEAK), respectively. The MPQ7231 is ideal for driving one or two IR LEDs.
The MPQ7231 provides ultra-low on resistance (RDS(ON)) MOSFETs, with a 44mΩ high-side MOSFET (HS-FET) and 40mΩ low-side MOSFET (LS-FET), using MPS’s advanced BCD FET technology to minimize ohmic losses. This improves the total system loss up to a factor of 10 times compared to the traditional, non-synchronous architecture with a Schottky diode. As a result, the system runs cooler and is significantly more efficient.
The MPQ7231 can support a 10Hz to 2kHz pulse-width modulation (PWM) dimming frequency range, which is compatible with IR LED applications that require 30fps, 60fps, or 120fps dimming. Constant frequency hysteretic control mode provides extremely fast transient response without loop compensation. Frequency spread spectrum (FSS) modulation improves EMC performance.
Eye-safety features include LED current limiting and factory preset dimming on-time limits (1ms, 3ms, or 5ms) to support the system in achieving ASIL requirements. The MPQ7231 provides a dedicated fault pin as well as protection features including LED short to battery (or ground) protection, LED open protection, over-current protection (OCP) with latch, thermal derating, and thermal shutdown.
The MPQ7231 requires a minimal number of readily available, standard external components to ensure a simple, compact, and efficient system design. It is available in a space-saving QFN-19 (3mmx4mm) package.
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Features & Benefits
- Built for Infrared (IR) LED Applications:
- 10Hz to 2kHz Pulse-Width Modulation (PWM) Dimming Frequency
- Compatible with 30fps, 60fps, and 120fps Dimming
- Improved Efficiency and Thermals:
- Integrated Current-Sense Resistor
- 44mΩ/40mΩ On Resistance (RDS(ON)) Internal MOSFETs
- Optimized for EMC/EMI Reduction:
- 2.4MHz (Buck) or 1.25MHz (Buck-Boost) Switching Frequency (fSW) with Frequency Spread Spectrum (FSS)
- EMI Reduction Techniques
- Functional Safety:
- Eye Safety Features Include:
- LED Current Limit
- Dimming On Time Limit (1ms, 3ms, or 5ms)
- Functional Safety Documents Available
- Fault Indication for LED Short (Battery and Ground), LED Open, Over-Voltage Protection (OVP), and Thermal Shutdown
- Over-Current Protection (OCP) with Latch-Off Mode
- Eye Safety Features Include:
- Additional Features:
- Wide 6V to 42V Operating Input Voltage (VIN) Range
- 3A Buck or 2.4A Buck-Boost Peak Current (IL_PEAK)
- Configurable Thermal Derating via NTC Remote Temperature Sensing
- Available in a QFN-19 (3mmx4mm) Package with Wettable Flanks
- Available in AEC-Q100 Grade 1

Active Part Numbers:
MPQ7231GLE-D00-AEC1-Z MPQ7231GLE-D10-AEC1-Z MPQ7231GLE-D30-AEC1-Z MPQ7231GLE-D50-AEC1-Z MPQ7231GLE-D00-AEC1-P MPQ7231GLE-D10-AEC1-P MPQ7231GLE-D30-AEC1-P MPQ7231GLE-D50-AEC1-P
Part numbers ending in P and Z are the same parts. P and Z only indicates reel size.
Meaning of P & Z
MPQ7231 Resources
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PRODUCT CATEGORY
AUTOMOTIVE IRPRODUCT CATEGORY -
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HEADLIGHTSAPPLICATIONHeadlights remain one of the most important functional safety features in any vehicle. While not a new feature, most new car models now feature LED headlights to provide increased brightness, better efficiency, and longer headlight lifespans. And of course, as with any automotive application, headlight designs must meet strict thermal requirements, ISO26262 safety standards, and EMC regulations. ...
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ALL LED LIGHTINGAPPLICATIONAutomotive LED lighting systems are comprised of the headlights, interior lights, rear lights, small lights, LED pixel light controllers, and DC/DC LED drivers. With increasingly dynamic and accurate LED lighting features that integrate flexible control, animation, and energy efficiency, key functions including supply, control, sense, actuation, and communication are also becoming more complex. Th...
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