Monolithic Power Systems introduces Current Sink LED Driver for automotive lighting applications. The MPQ7225 is a 16-channel current sink LED driver. Each channel is rated for up to 200 mA of current, and 16 ICs can be cascaded together to create a 256-channel solution.

The MPQ7225 is optimized for animated or dynamic lighting applications. It employs 12-bit pulse-width modulation (PWM) dimming and a 6-bit analog dimming register per channel, with individual control of each channel. The MPQ7225 is designed to function across distanced PCBs with a robust, high-speed, CAN-compatible differential interface.

The MPQ7225 features adaptive feedback control (AFC) to maximize system efficiency. The output voltage (V_OUT) of the pre-regulator (e.g. buck voltage regulator) is adjusted in real-time so that the voltage across the channels remains at a minimum value (typically 300 mV headroom at 200 mA).

Frequency spread spectrum (FSS) optimizes EMC performance. The LED current’s ramping rate and the phase shift between channels can be digitally configured as well.

The MPQ7225 can aid a system design for functional safety with a failsafe (/FS) indicator. The full protection suite includes LED open protection, LED short protection, ISET pin open protection, ISET pin short protection, and thermal shutdown. If a fault condition occurs, the fault indicator pulls low, and the matching fault register is set.

The MPQ7225 is available in a QFN-32 (5 mmx6 mm) package and is AEC-Q100 qualified.

Key features and benefits

• Scalability:

1. 16 Channels, 200 mA/Channel (Max Current)
2. Cascades up to 16 ICs for up to 256 Channels
3. Pin-Configurable Device Address

• Designed for Automotive Applications:

1. Supports 2.5 V Cold-Crank Conditions
2. Operating Junction Temperature (TJ) from -40°C to +150°C

• Cooler Thermals and Optimized Efficiency:

1. Adaptive Feedback Control (AFC) Dynamically Optimizes Pre-Regulator Output
2. 300mV Current Sink Headroom at 200mA
3. Headroom Optimization for Multiple ICs

• Robust Communication:

1. 2Mbps CAN-Compatible Differential Interface
2. 12-Bit Pulse-Width Modulation (PWM) Dimming or 6-Bit Analog Dimming for Each Channel

• Optimized EMI/EMC:

1. Configurable Phase Shift and Slew Rate
2. Frequency Spread Spectrum (FSS) (Internal Clock)
3. Selectable PWM Dimming Frequency
4. CISPR25 Class 5 Compliant

Additional features

• Functional Safety Document Available to Support System in Achieving ASIL Requirements
• Failsafe (/FS) Pin and Fault Registers for System Protection and Diagnostics:

1. LED Short (to GND and Battery)
2. LED Open
3. Thermal Warning and Shutdown
4. ISET Pin Open/Short

• Memory
• Available in a QFN-32 (5 mm  x6 mm) Package with Wettable Flanks
• Available in AEC-Q100 Grade 1

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