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6 Channels, Max.150mA/Ch Boost WLED Driver With 15000:1 Dim Ratio and I2C
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The MPQ3367 is a step-up converter with 6-channel current sources. It is designed for driving the white LED arrays as backlighting of middle or small size LCD panel.
The MPQ3367 uses peak-current mode as its PWM control architecture to regulate the boost converter. 6 channel current sources are applied into the LED cathode to adjust the LED brightness. It regulates the current in each LED string to the value set by an external current-setting resistor, with 2.5% current regulation accuracy between strings.
MPQ3367 employs a low on-resistor MOSFET and a low headroom voltage design to get the higher efficiency. It has standard I2C digital interface for easy use. The switching frequency can be programmed by a resistor, I2C interface or external clock.
MPQ3367 provides analog/PWM/mix dimming mode with PWM input. Dimming mode can be selected by I2C interface or MIX/AD pin. It also has the phase shift function to eliminate the noise when PWM dimming.
Rich protections are designed to guarantee safety operation. The protection modes include OCP (over-current protection), OVP (over-voltage protection), OTP (over-temperature protection), LED short and open protection. Besides the LED current decreases automatically at higher temperature is optional.
The MPQ3367 is available in QFN24-4mmX4mm and TSSOP28-EP package.
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Features & Benefits
- 3.5V to 36V Input Voltage Range
- 6 Channels with Max. 150mA per Channel
- Internal 100mΩ, 50V MOSFET
- Programmable Up to 2.2MHz Fsw
- External Sync SW Function
- Multi-Dimming Operation Mode thru PWM input Including:
- Direct PWM Dimming
- Analog Dimming
- Mix Dimming with 25%/12.5% transfer point
- 15000:1 Dim Ratio in PWM Dim at Fpwm≤200Hz
- 200:1 Dim Ratio at Analog Dim thru PWM Dim Signal Input.
- Excellent EMI Performance, Frequency Spread Spectrum
- I2C Interface
- Phase Shift Function for PWM Dimming
- 2.5% Current Matching
- Cycle by Cycle Current Limit
- Disconnect VOUT from VIN
- Optional LED Current Auto Decrement at High Temperature
- LED Short/Open, OTP, OCP, Inductor Short Protection
- Programmable LED Short Threshold
- Programmable OVP Threshold
- Fault Indicator Signal Output
- QFN24-4mmX4mm and TSSOP28-EP Package
EVQ3367-R-01A Evaluation Kit 6-Channel, Maximum 150mA/Ch Boost WLED Driver with 15000:1 Dimming Ratio and I2C Evaluation Board
The EVQ3367-R-01A is an evaluation board designed for the MPQ3367, a step-up converter with six channel current sources. It is designed to drive the white LED arrays as backlighting for small- or medium-sized LCD panels.
The device uses peak current mode as its PWM control architecture to regulate the boost converter. Six channel current sources are applied to the LED cathode to adjust the LED brightness. The MPQ3367 regulates the current in each LED string to the value set by an external current-setting resistor, with 2.5% current regulation accuracy between strings.
A low on resistance MOSFET and headroom voltage are provided to improve efficiency. The MPQ3367 has a standard I2C digital interface for easy use. The switching frequency can be configured via a resistor, I2C interface, or external clock.
The MPQ3367 provides analog, PWM, and mix dimming mode with a PWM input. The dimming mode can be selected with the I2C interface or the MIX/AD pin. The device also has a phase shift function to eliminate noise during PWM dimming.
Protection features that guarantee safe operation include over-current protection (OCP), over-voltage protection (OVP), over-temperature protection (OTP), LED short and open protection. The LED current also automatically decreases at high temperatures.
The MPQ3367 is available in QFN-24 (4mmx4mm) and TSSOP-28EP packages.