MP3385

NOT RECOMMENDED FOR NEW DESIGNS

4-ch, 80V Boost WLED Controller with I2C

ALTERNATIVE PART

NRFND Datasheet

MP3385 continues to be in production for existing customers. Please consider this alternative for new designs:

MP3385A

4-ch, 80V Boost WLED Controller with I2C

Features & Benefits

4-String, Max 300mA/String WLED Driver
4.5V to 33V Input Voltage Range
80V ABS Rating for Each String
1.8% Current Matching Accuracy for Each String
Unused Channel Auto-Detection Function during Start-Up
100kHz-900kHz Programmable Switching Frequency
Multiple Dimming Modes Selected by I2C Interface
o Direct PWM Dimming Mode
o Internal Fixed 23kHz PWM Dimming Mode by I2C
o Analog Dimming Mode by Input Pulse
o Internal Analog Dimming Mode by I2C
o Mixed Dimming Mode by Input Pulse
o Internal Mixed Dimming Mode by I2C
2%-100% Programmable Full Scale Current with 8-Bit Resolution
0%-100% LED Dimming Range with 10-Bit Resolution for Internal Dimming Mode
Cascading Capability with a Single Power Source
18V to 80V Over-Voltage Protection (OVP), 2V/Step
0.15V to 0.5V Latch-Off/Recoverable Over-Current Protection (OCP) Threshold, 50mV/Step
Recoverable Thermal Shutdown Protection

… and many more!

Description

The MP3385 is a step-up controller with 4 regulated current channels designed to drive WLED arrays for middle and large-size LCD panel backlighting applications. The MP3385 uses peak current mode, PWM control architecture for system loop regulation. It drives an external MOSFET to boost up the output voltage from a 4.5V to 33V input supply. It employs an I2C digital interface and can flexibly set the operation and protection modes, including dimming mode, dimming current and dimming ratio, OCP, OVP, LED short protection threshold, and the switching frequency. For easy application use and board debugging, the MP3385 detects and automatically disables the unused LED strings during start-up to avoid charging the output to the OVP threshold. The MP3385 achieves 1.8% current matching between each string. The low regulation voltage on the LED current sources improves efficiency and reduces power loss in order to achieve a higher current output. The MP3385 supports analog, PWM, and combined analog and PWM dimming modes to meet different application requirements. Full protection features include OCP, OTP, UVP, OVP, LED short/open protection, and inductor/diode short protection. The MP3385 is available in a QNF-20 4mm x 4mm and a TSSOP20-EP package.

Features & Benefits

4-String, Max 300mA/String WLED Driver
4.5V to 33V Input Voltage Range
80V Abs. Rating for Each String
1.8% Current Matching Accuracy for Each String
Unused Channel Auto-Detection Function during Start-Up
100kHz-900kHz Programmable Switching Frequency
Multiple Dimming Modes Selected by I2C Interface:
1. Direct PWM Dimming Mode
2. Internal Fixed 23kHz PWM Dimming Mode
3. Analog Dimming Mode by Input Pulse
4. Internal Analog Dimming Mode
5. Mixed Dimming Mode by Input Pulse
6. Internal Mixed Dimming Mode
2%-100% Programmable Full Scale Current with 8-Bit Resolution
0%-100% LED Dimming Range with 10-Bit Resolution for Internal Dimming Mode
Cascading Capability with a Single Power Source
18V to 80V Over-Voltage Protection, 2V/Step
0.15V to 0.5V Latch-Off/Recoverable OCP Protection Threshold, 50mV/Step
Recoverable Thermal Shutdown Protection

Active Part Numbers:

MP3385AGR-P MP3385AGR-Z MP3385GF-P MP3385GF-Z MP3385GR-P MP3385GR-Z

Evaluation Tools

4EV3385-R-00A Evaluation Kit String WLED Controller With I²C Interface Evaluation Board

The MP3385 is a step-up controller with 4 regulated current channels designed to drive WLED arrays for middle and large-size LCD panel backlighting applications.

The MP3385 uses peak current mode, PWM control architecture for system loop regulation. It drives an external MOSFET to boost up the output voltage from a 4.5V to 33V input supply.

It employs an I2C digital interface and can flexibly set the operation and protection modes, including dimming mode, dimming current and dimming ratio, OCP, OVP, LED short protection threshold, and the switching frequency. For easy application use and board debugging, the MP3385 detects and automatically disables the unused LED strings during start-up to avoid charging the output to the OVP threshold.

The MP3385 achieves 1.8% current matching between each string. The low regulation voltage on the LED current sources improves efficiency and reduces power loss in order to achieve a higher current output.

combined analog and PWM dimming modes to meet different application requirements. Full protection features include OCP, OTP, UVP, OVP, LED short/open protection, and inductor/diode short protection.

The MP3385 is available in a QFN-20 4mm x 4mm and a TSSOP20-EP package.

$100.00
+ tax

Design Resources

Symbol, Footprint & 3D Model

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