MP3385GR-P

MP3385GR-P Datasheet

MP3385

Part	Datasheet
MP3385GR-P	MP3385GR-P (pdf)

Related Parts	Information
MP3385GF	MP3385GF
MP3385GF-Z	MP3385GF-Z
MP3385GR-Z	MP3385GR-Z

PDF Datasheet Preview
MP3385 4-String, 80V Output WLED Controller with I2C Interface 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 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. • 4-String, Max 300mA/String WLED Driver • 4.5V to 33V Input Voltage Range • 80V Abs. Rating for Each String • 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 Direct PWM Dimming Mode Internal Fixed 23kHz PWM Dimming Mode Analog Dimming Mode by Input Pulse Internal Analog Dimming Mode Mixed Dimming Mode by Input Pulse 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 • Desktop LCD Flat Panel Displays • All-in-One • 2D/3D LCD TV All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. 7/21/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2017 MPS. All Rights Reserved. MP3385 4-STRING WLED CONTROLLER WITH I2C INTERFACE 4.5V-33V VIN C3 R4 C4 R3 4 VIN 1 R3 DRV 2 VCC IS 19 11 COMP PGND 15 10 OSC MP3385 6 SCL 18 OVP 17 LED1 LED2 16 7 SDA 14 LED3 20 AGND ORDERING INFORMATION Part Number MP3385GR* MP3385GF** Package QFN-20 4mm x 4mm TSSOP20-EP Top Marking See Below See Below * For Tape & Reel, add suffix e.g. ** For Tape & Reel, add suffix e.g. TOP MARKING QFN-20 4mm x 4mm MPS prefix Y Year code WW Week code MP3385 Part number Lot number TOP MARKING TSSOP20-EP MPS prefix YY Year code WW Week code MP3385 Part number Lot number PACKAGE REFERENCE 20 ANGD 19 IS 18 OVP 17 LED1 16 LED2 DRV 1 VCC 2 EN 3 VIN 4 PWM 5 Exposed Pad Connect to GND 15 PGND 14 LED3 13 LED4 12 ISET 11 COMP SCL 6 SDA 7 FT 8 LPF 9 OSC 10 QFN-20 4mm x 4mm DRV 1 VCC 2 EN 3 VIN 4 PWM 5 SCL 6 SDA 7 FT 8 LPF 9 OSC 10 Exposed Pad Connect to GND 20 AGND 19 IS 18 OVP 17 LED1 16 LED2 15 PGND 14 LED3 13 LED4 12 ISET 11 COMP TSSOP20-EP 7/21/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2017 MPS. All Rights Reserved. MP3385 4-STRING WLED CONTROLLER WITH I2C INTERFACE ABSOLUTE MAXIMUM RATINGS 1 -0.3V to +40V VOVP, VLED1 to VLED4 -0.3V to +80V All other pins -0.3V to +6.5V Continuous power dissipation TA = 25°C 2 QFN-20 4mm x 4mm ...............................2.97W Junction temperature 150°C Lead temperature 260°C Recommended Operating Conditions 3 Supply voltage VIN 4.5V to 33V Operating junction temp........... -40°C to +125°C Thermal Resistance 4 QFN-20 4mm x NOTES 1 Exceeding these ratings may damage the device. 2 The maximum allowable power dissipation is a function of the maximum junction temperature TJ MAX , the junction-toambient thermal resistance and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD MAX = TJ Exceeding the maximum allowable power dissipation will produce an excessive die temperature, causing the regulator to go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3 The device is not guaranteed to function outside of its operating conditions. 4 Measured on JESD51-7, 4-layer PCB. 7/21/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2017 MPS. All Rights Reserved. MP3385 4-STRING WLED CONTROLLER WITH I2C INTERFACE ELECTRICAL CHARACTERISTICS VIN = 12V, VEN = 5V, TA = 25°C, unless otherwise noted. Parameters

PDF Datasheet Preview

MP3385
4-String, 80V Output WLED Controller with I2C Interface

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 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.
• 4-String, Max 300mA/String WLED Driver
• 4.5V to 33V Input Voltage Range
• 80V Abs. Rating for Each String
• 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 Direct PWM Dimming Mode Internal Fixed 23kHz PWM Dimming Mode Analog Dimming Mode by Input Pulse Internal Analog Dimming Mode Mixed Dimming Mode by Input Pulse 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
• Desktop LCD Flat Panel Displays
• All-in-One
• 2D/3D LCD TV

All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc.
7/21/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
2017 MPS. All Rights Reserved.

MP3385 4-STRING WLED CONTROLLER WITH I2C INTERFACE
4.5V-33V VIN

C3 R4 C4 R3
4 VIN
1 R3 DRV
2 VCC

IS 19
11 COMP

PGND 15
10 OSC

MP3385
6 SCL
18 OVP
17 LED1 LED2 16
7 SDA
14 LED3
20 AGND
ORDERING INFORMATION

Part Number MP3385GR* MP3385GF**

Package QFN-20 4mm x 4mm

TSSOP20-EP

Top Marking See Below See Below
* For Tape & Reel, add suffix e.g. ** For Tape & Reel, add suffix e.g.

TOP MARKING QFN-20 4mm x 4mm

MPS prefix Y Year code WW Week code MP3385 Part number Lot number

TOP MARKING TSSOP20-EP

MPS prefix YY Year code WW Week code MP3385 Part number Lot number

PACKAGE REFERENCE
20 ANGD 19 IS 18 OVP 17 LED1 16 LED2

DRV 1 VCC 2 EN 3 VIN 4 PWM 5

Exposed Pad Connect to GND
15 PGND 14 LED3 13 LED4 12 ISET 11 COMP

SCL 6 SDA 7

FT 8 LPF 9 OSC 10

QFN-20 4mm x 4mm

DRV 1 VCC 2

EN 3 VIN 4 PWM 5 SCL 6 SDA 7

FT 8 LPF 9 OSC 10

Exposed Pad Connect to GND
20 AGND 19 IS 18 OVP 17 LED1 16 LED2 15 PGND 14 LED3 13 LED4 12 ISET 11 COMP

TSSOP20-EP
7/21/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
2017 MPS. All Rights Reserved.

MP3385 4-STRING WLED CONTROLLER WITH I2C INTERFACE

ABSOLUTE MAXIMUM RATINGS 1
-0.3V to +40V VOVP, VLED1 to VLED4 -0.3V to +80V All other pins -0.3V to +6.5V Continuous power dissipation TA = 25°C 2 QFN-20 4mm x 4mm ...............................2.97W Junction temperature 150°C Lead temperature 260°C

Recommended Operating Conditions 3 Supply voltage VIN 4.5V to 33V Operating junction temp........... -40°C to +125°C

Thermal Resistance 4 QFN-20 4mm x

NOTES 1 Exceeding these ratings may damage the device. 2 The maximum allowable power dissipation is a function of the
maximum junction temperature TJ MAX , the junction-toambient thermal resistance and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD MAX = TJ Exceeding the maximum allowable power dissipation will produce an excessive die temperature, causing the regulator to go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3 The device is not guaranteed to function outside of its operating conditions. 4 Measured on JESD51-7, 4-layer PCB.
7/21/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
2017 MPS. All Rights Reserved.

MP3385 4-STRING WLED CONTROLLER WITH I2C INTERFACE

ELECTRICAL CHARACTERISTICS

VIN = 12V, VEN = 5V, TA = 25°C, unless otherwise noted.

Parameters

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived MP3385GR-P Datasheet file may be downloaded here without warranties.

Datasheet ID: MP3385GR-P 650025