MP3367GF-Z

MP3367 MPS | Alldatasheet

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Technical content

6-Channel, Max.150mA/Ch Boost WLED Driver with 15000:1 Dim Ratio and I2C MP3367 Rev. 1.0 www.MonolithicPower.com 1 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.

DESCRIPTION

The MP3367 is a step-up converter with six channel current sources, designed to drive white LED arrays as backlighting in small-to-mid-size LCD panels. The MP3367 uses peak current mode as its PWM control architecture to regulate the boost converter. Six channel current sources are applied into the LED cathode to adjust the LED brightness. The MP3367 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. The MP3367 employs a low on -resistor MOSFET and a low headroom voltage, designed for higher efficiency. It has a standard I2C digital interface for eas e of use. The switching frequency can be programmed by a resistor, I2C interface, or external clock. The MP3367 provides analog, PWM, and mix dimming mode with a PWM input . Dimming mode can be selected with the I2C interface or the MIX/AD pin. It also has a phase shift function to eliminate noise during PWM dimming. Robust protections are included to guarantee safe operation of the device . Protection modes include over -current protection (OCP), over - voltage protection (OVP), over -temperature protection (OTP), LED short , and open protection. There is also an option that automatically decreases the LED current at higher temperatures. The MP3367 is available in QFN-24 4mmx4mm and TSSOP28-EP packages.

FEATURES

 3.5V to 36V Input Voltage Range  Six Channels with Max 150mA per Channel  Internal 100mΩ, 50V MOSFET  Programmable Up to 2.2MHz fSW  External Sync SW Function  Multi-Dimming Operation Mode through PWM Input, Including: o Direct PWM Dimming o Analog Dimming o 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 through 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 Temperatures  LED Short/Open, OTP, OCP, and Inductor Short Protections  Programmable LED Short Threshold  Programmable OVP Threshold  Fault Indicator Signal Output  Available in QFN-24 4mmx4mm and TSSOP28-EP Packages

APPLICATIONS

 Tablet/Notebook All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, visit the MPS website under Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are registered trademarks of Monolithic Power Systems, Inc. or its subsidiaries.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 2 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL APPLICATION MIX/AD DIM FREQ/SYNC EN SCL/PSE SDA/PSE FF ISET AGND LED6 LED5 LED3 LED2 LED1 SW PGND OVP STH FSP VCC SD VIN MP3367 7 8 9 10 11 12 192021222324 VIN GND String 1 String 2 String 3 String 4 String 5 String 6 VOUT EN PWM SDA SCL VCC FF LED4 COMP

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 3 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.

ORDERING INFORMATION

Part Number* Package Top Marking MP3367GR QFN-24 (4mmX4mm) See Below MP3367GF TSSOP28-EP See Below * For Tape & Reel, add suffix –Z (e.g. MP3367GR–Z). * For Tape & Reel, add suffix –Z (e.g. MP3367GF–Z). TOP MARKING (MP3367GR) MPS: MPS prefix Y: Year code WW: Week code MP3367: Part number LLLLLL: Lot number TOP MARKING (MP3367GF) MPS: MPS prefix YY: Year code WW: Week code MP3367: Part number LLLLLLLLL: Lot number

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 4 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. PACKAGE REFERENCE TOP VIEW TOP VIEW QFN-24 (4mmx4mm) TSSOP28-EP PIN FUNCTIONS QFN-24 Pin # TSSOP28-EP Pin # Name Description 1 5 DIM PWM signal input pin. Apply a PWM signal on DIM for brightness control. Pulled low internally. A 100Hz to 20kHz PWM signal is recommended. 2 6 MIX/AD Dimming mode set pin. MIX/AD is a current source output (18 μA). Connect a resistor to program its voltage. When MIX/AD is low -level (<0.3V), mix dimming is adopted. When MIX/AD is mid -level (0. 5V to 0.8V), PWM dimming is adopted. When MIX/AD is high -level ( 1.0V to 1.3V), analog dimming is adopted. When MIX/AD is floated, the dimming mode is set by the internal MODE register. 3 7 FREQ/SYNC Switching frequency setting and SYNC pin. The switching frequency is decided by the voltage and current on this pin. Connect a resistor between FREQ/SYNC and GND to set the converter’s switching frequency , or connect an external clock to the sync boost switching frequency. Leave FREQ/SYNC floating if the internal switching frequency set re gister FSW1:0 is used. 4 8 EN IC enable pin. Pull EN high to enable the IC. When EN is pulled low, the IC enters shutdown. 5 9 SCL/PSE I2C interface clock input pin. Tie SDA/PSE together with SCL/PSE and pull up to 0.75V to 1V to enable the phase-shift PWM dimming function. 6 10 SDA/PSE I2C interface data input pin. Tie SCL/PSE together with SDA/PSE and pull up to 0.75V to 1V to enable the phase-shift PWM dimming function. 7 11 COMP Compensation pin. 8 12 FF Fault flag pin. Open-drain during normal operation, pulled to low in any fault mode.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 5 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. PIN FUNCTIONS (continued) QFN-24 Pin # TSSOP28- EP Pin # Name Description 9 13 ISET LED current setting. Tie a current -setting resistor from ISET to GND to program the current in each LED string. 10 14 AGND Analog ground. 11 15 LED6 LED string 6 current input. Connect the LED string 6 cathode to this pin. 12 16 LED5 LED string 5 current input. Connect the LED string 5 cathode to this pin. 13 17 LED4 LED string 4 current input. Connect the LED string 4 cathode to this pin. 14 18 LED3 LED string 3 current input. Connect the LED string 3 cathode to this pin. 15 19 LED2 LED string 2 current input. Connect the LED string 2 cathode to this pin. 16 20 LED1 LED string 1 current input. Connect the LED string 1 cathode to this pin. 17 21 PGND Step-up converter power ground. 18 23 SW Drain for the internal low-side MOSFET switch. Connect the power inductor to SW. 19 25 OVP Over-voltage protection pin. Connect a resistor divider from OVP to GND to program the OVP threshold. 20 26 STH Short LED protection threshold set pin . STH is a current source output (18μA). Connect a resistor to program its voltage. Float this pin if the internal short LED protection threshold set register TH_S 1:0 is used. 21 27 FSP Switching frequency spread spectrum pin. FSP is a current source output (18μA). Connect a resistor to program its voltage. Float this pin to follow the internal register setting. 22 28 VCC 5V LDO output pin. VCC provides power for the internal logic and gate driver. Place a ceramic capacitor as close to this pin as possible to reduce noise. 23 1 SD External disconnect PMOS gate drive pin. Turn off the external PMOS in fault condition. Float this pin if not used. 24 3 VIN Power supply input. VIN supplies power to the IC. 2, 4, 22, 24 NC No connection. Exposed pad Exposed pad AGND Chip ground. Connect exposed pad to AGND.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 6 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. ABSOLUTE MAXIMUM RATINGS (1) Continuous power dissipation (TA = 25°C) (2) Recommended Operating Conditions (3) Thermal Resistance (4) θJA θJC Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature T J (MAX), the junction -to- ambient thermal resistance θ JA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX) - TA) / θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will 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.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 7 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

VIN = 12V, VEN = 2V, TA = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Operating input voltage VIN 3.5 36 V Supply current (quiescent) IQ No switching 5 mA Supply current (shutdown) IST VEN = 0V, VIN = 12V 1 μA Input UVLO threshold VIN_UVLO Rising edge 3.1 V Input UVLO hysteresis 100 mV LDO output voltage VCC VEN = 2V, 6V < VIN < 24V, 0 < IVCC < 10mA 5 V EN on threshold VEN_ON VEN rising 1.2 V EN off threshold VEN_OFF VEN falling 0.4 V EN pull-down resistance REN 1 MΩ Step-Up Converter Low-side MOSFET on resistance RDS_LS VIN = 12V 100 mΩ SW leakage current ISW_LK VSW = 45V 1 μA Switching frequency fSW RFREQ = 10kΩ 1.98 2.2 2.42 MHz RFREQ = 40kΩ 495 550 605 kHz FSW1:0 = 01, FREQ float 340 400 460 kHz FREQ voltage VFREQ 0.57 0.6 0.63 V FSP pull-up current IFSP 18 μA Maximum duty cycle DMAX fSW = 1MHz 90 % Cycle-by-cycle current limit ISW_LIMIT TJ = 25°C, duty = 90% 2.6 A Current limit protection ICL To trigger current limit protection 7.5 A SYNC input low threshold VSYNC_LO VSYNC falling 0.4 V SYNC input high threshold VSYNC_HI VSYNC rising 1.2 V PSE active threshold VPSE Phase shift enabled 0.75 0.9 1.0 V COMP trans-conductance GCOMP ΔICOMP ≤ 10μA 100 μA/V COMP source current limit ICOMP_SO 90 μA COMP sink current limit ICOMP_SI 30 μA Current Dimming DIM input low threshold VDIM_LO VDIM falling 0.4 V DIM input high threshold VDIM_HI VDIM rising 1.2 V MIX/AD input low threshold VMIX_LO Mix dimming threshold 0.3 V MIX/AD input middle threshold VMIX_MID PWM dimming threshold 0.5 0.8 V MIX/AD input high threshold VMIX_HI Analog dimming threshold 1.0 1.3 V

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 8 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS (continued) VIN = 12V, VEN = 2V, TA = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units MIX/AD pull-up current IMIX MIX/AD pull-up current 18 μA Mix dimming transfer point MIXTP bit = 0 25 % Transfer point hysteresis 0.5 % Mix dimming output dimming frequency fMIX MIXFR bit = 0 200 Hz LED Current Regulator LEDX regulation voltage VHD ILED = 20mA 350 mV ILED = 100mA 850 1000 mV Current matching (5) ILED = 20mA -2.5 2.5 % ILED = 100mA -2.5 2.5 % ISET voltage VISET 1.2 V LED current ILED RISET = 24.9kΩ 48.75 50 51.25 mA ILED = 1/50 * 50mA = 1mA 0.9 1.05 1.2 mA Phase-shift degree LED1 to 6 enable 60 ° LED1 to 4 enable 90 ° Protection Over-voltage protection threshold VOVP 1.9 2 2.1 V OVP hysteresis 200 mV OVP UVLO threshold VOVP_UV Step-up converter fails 100 mV LEDX over-voltage threshold VLEDX_OV LEDS bits = 01 5 V LEDX over-voltage fault timer 7.7 ms LEDX UVLO threshold VLEDX_UV 100 mV Thermal shutdown threshold (6) TST Rising edge 170 °C Hysteresis 20 °C SD pull-down current ISD 60 μA SD voltage (respective to VIN) VSD-IN VIN = 12V, VIN - VSD 6 V STH pull-up current ISTH STH pull-up current 18 μA I2C Interface Input logic low VIL 0.4 V Input logic high VIH 1.2 V Output logic low VOL ILOAD = 3mA 0.4 V SCL clock frequency fSCL 400 kHz SCL high time tHIGH 0.6 μs SCL low time tLOW 1.3 μs Data set-up time tSU,DAT 100 ns Data hold time tHD,DAT 0 0.9 μs Set-up time for repeated start tSU,STA 0.6 μs

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 9 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS (continued) VIN = 12V, VEN = 2V, TA = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Hold time for start tHD,STA 0.6 μs Bus free time between start and stop condition tBUF 1.3 ms Set-up time for stop condition tSU,STO 0.6 μs Rise time of SCL and SDA tR 20 + 0.1 × CB 300 ns Fall time of SCL and SDA tF 20 + 0.1 × CB 300 ns Pulse width of suppressed spike tSP 0 50 ns Capacitance bus for each bus line CB 400 pF Figure 1: I2C Compatible Interface Timing Diagram Notes: 5) Matching is defined as the difference of the maximum to minimum current divided by 2 times the average current. 6) Guarantee by design.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 10 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, L = 22µH, LED = 6P12S, fSW = 400kHz, ISET = 50mA, TA = 25°C, unless otherwise noted. Steady State fSW = 400kHz Steady State fSW = 2.2MHz CH1: VSW 20V/div. CH2: VOUT 20V/div. CH3: IL 500mA/div. CH4: ILED 200mA/div. CH1: VSW 20V/div. CH2: VOUT 20V/div. CH3: IL 500mA/div. CH4: ILED 200mA/div. 4µs/div. 1µs/div. VIN Power-On EN Power-On CH1: VSW 20V/div. CH2: VIN 5V/div. CH3: IL 500mA/div. CH4: ILED 200mA/div. CH1: VSW 20V/div. CH2: VEN 5V/div. CH3: IL 500mA/div. CH4: ILED 200mA/div. 10ms/div. 10ms/div. PWM Dimming fPWM = 200Hz, DPWM = 50% PWM Dimming fPWM = 20kHz, DPWM = 50% CH1: VSW 20V/div. CH2: VPWM 5V/div. CH3: IL 1A/div. CH4: ILED 200mA/div. CH1: VSW 20V/div. CH2: VPWM 5V/div. CH3: IL 1A/div. CH4: ILED 200mA/div. 4ms/div. 40µs/div.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 11 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 12V, L = 22µH, LED = 6P12S, fSW = 400kHz, ISET = 50mA, TA = 25°C, unless otherwise noted. PWM Dimming fPWM = 200Hz, DPWM = 0.01% PWM Dimming fPWM = 200Hz, DPWM = 0.001% CH1: VSW 20V/div. CH2: VPWM 5V/div. CH3: IL 200mA/div. CH4: ILED 200mA/div. CH1: VSW 20V/div. CH2: VPWM 5V/div. CH3: IL 200mA/div. CH4: ILED 200mA/div. 1µs/div. 1µs/div. Mix Dimming fPWM = f(ILED) = 200Hz, DPWM = 10% Mix Dimming fPWM = 200Hz, f(ILED) = 23kHz, DPWM = 10% CH1: VSW 20V/div. CH2: VPWM 5V/div. CH3: IL 500mA/div. CH4: ILED 100mA/div. CH1: VSW 20V/div. CH2: VPWM 5V/div. CH3: IL 500mA/div. CH4: ILED 100mA/div. 2ms/div. 40µs/div. Phase Shift Function fPWM = 200Hz, PWM Dimming, 6-channel enable Frequency Spread Spectrum fPWM = 400Hz, 1/100 of center frequency CH1: VSW 20V/div. CH2: VPWM 5V/div. CH3: ILED1 50mA/div. CH4: ILED2 50mA/div. CH1: VSW 20V/div. CH2: VOUT 20V/div. CH3: IL 500mA/div. CH4: ILED 200mA/div. 2ms/div. 2µs/div.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 12 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 12V, L = 22µH, LED = 6P12S, fSW = 400kHz, ISET = 50mA, TA = 25°C, unless otherwise noted. Open LED Protection Open 1 string @ working Short LED Protection Short 1 string @ working CH1: VSW 20V/div. CH2: VFF 5V/div. CH3: IL 500mA/div. CH4: ILED 200mA/div. CH1: VLED6 5V/div. CH2: VFF 5V/div. CH3: IL 500mA/div. CH4: ILED 200mA/div. 2ms/div. 4ms/div. Short Inductor Protection Short Diode Protection CH1: VSW 20V/div. CH2: VFF 5V/div. CH3: II_SHORT 5A/div. CH4: ILED 200mA/div. CH1: VSW 20V/div. CH2: VFF 5V/div. CH3: II_SHORT 5A/div. CH4: ILED 200mA/div. 10µs/div. 10µs/div. Short VOUT to GND Protection Thermal Protection CH1: VSW 20V/div. CH2: VSD 5V/div. CH3: IL 5A/div. CH4: ILED 200mA/div. CH1: VSW 20V/div. CH2: VFF 5V/div. CH3: IL 1A/div. CH4: ILED 200mA/div. 1ms/div. 1s/div.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 13 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. FUNCTIONAL BLOCK DIAGRAM Control Logic Slope Regulator Current Control DIM & Digital Control Fault Control BG & Logic REF MIX/AD ISET LED1 LED2 LED3 LED4 LED5 LED6 COMP EN OVP SW FREQ/ SYNC VCC VIN EA VIN VOUTL D COUTCIN PGND AGND LED1-6 Oscillator 100mV OVP UVP SD 1.2V SDA/PSE SCL/PSE OCP Max STHLED Short Threshold LED_S Feedback Control Max Min FSP Min FF Fault Flag FF FF VCC FF EN DIM OTP COMP Saturated DIM Figure 2: Functional Block Diagram

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 14 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. OPERATION The MP3367 is a programmable, constant frequency, peak current mode step-up converter with up to six channels of regulated current sources to drive the array of white LEDs. Internal 5V Regulator The MP3367 includes an internal linear regulator (VCC). When V IN exceeds 6V, this regulator outputs a 5V power supply to the internal MOSFET switch gate driver and the internal control circuitry. The VCC voltage drops to 0V when the chip shuts down. The chip remains disabled until VCC exceeds the UVLO threshold. System Start-Up When enabled, the MP3367 checks the topology connection. The IC draws current from SD to enable the input disconnect PMOS to be turned on (if this PMOS is used) . After a 500μs delay, the IC monitors OVP to see if the output is shorted to GND. If the OVP voltage is less than 100mV, the IC disables and latches off. The MP3367 then continues to check other safety limits (e.g. LED open, over-voltage protection). If all protection tests pass, the IC starts boosting the step-up converter with an internal soft start. The recommended power-on sequence is VIN  EN  I2C (optional)  PWM dim signal. Step-Up Converter The MP3367 employs peak current mode control to regulate the output energy. At the beginning of each switching cycle, the internal clock turns on the internal N-MOSFET. In normal operation, the minimum turn -on time is a bout 100ns. A stabilizing ramp added to the output of the current-sense amplifier prevents sub -harmonic oscillations for duty cycles greater than 50 %. This result is fed into the PWM comparator. When t he summed voltage reaches the output voltage of the error amplifier , the internal MOSFET turns off. The output voltage of the internal error amplifier is an amplified signal of the difference between the reference voltage and the feedback voltage. The converter automatically chooses the lowest active LEDX pin voltage to provide a high enough output voltage to power all the LED arrays. If the feedback voltage drops below the reference voltage, the output of the error amplifier increases. More current then flows through the MOSFET, increasing the power delivered to the output. This forms a closed loop that regulates the output voltage. During light-load operation , especially in the case of VOUT ≈ VIN, the converter runs in pulse- skipping mode. In this mode, the MOSFET turns on for a minimum on time, then the converter discharges the power to the output for the remaining period. The external MOSFET remains off until the output voltage needs to be boosted again. Dimming Control The MP3367 provides analog, PWM, and mix dimming methods . Dimming mode can be set with I2C or by connecting a different resistor at MIX/AD. The voltage of MIX/AD is calculated with Equation (1): V_MIX/AD(mV) = 18(μA) × R_MIX/AD(kΩ) (1) Where V_MIX/AD is the voltage and R_MIX/AD is the resistor at MIX/AD. Mix Dimming Mode There are two different ways the MP3367 works in mixture dimming mode, with 25% or 12.5% as its transfer point (selected thr ough the internal register). The first option is to c onnect a resistor and set MIX/AD to low (<0.3V). The second is to float MIX/AD, and set the internal mode -select register MODE 1:0 = 00 through I2C. A PWM dimming signal is applied to DIM. When the dimming duty is greater than 25%, analog dimming is adopted, and the LED current amplitude follows the duty of PWM. When the dimming duty is less than 25%, PWM dimming is used (see Figure 2). The LED current amplitude remains at 1/4 of the full-scale current, and the output dimming duty is 4 times the duty of the input PWM signal. There are t wo option s for output dimming frequency when using mix dimming: 200Hz (default) or 23kHz (no audible noise, but larger minimum dimming duty). This

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 17 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. The short protection threshold can be set one of two ways: The first option is to c onnect a resistor at STH. STH outputs an 18μA current source. The short protection threshold is 10 times the voltage on STH. The threshold is calculated using Equation (3): V_STH(V) = 0.18 × R_STH(kΩ) (3) The second option is to set the internal register TH_S1:0 when STH is floating. When the LEDX voltage exceeds the threshold for 480ms (DPWM = 100%), all strings are marked off. The IC remains on standby until the strings release from shorting. Enable or disable this function through SEN. The mark ed-off string send s a 10μs pulse current to check if a short fault is removed after every 500μs delay, so short string protection is recoverable. Short LEDX to GND Protection When LEDX shorts to GND, the COMP voltage increases and saturates . When the COMP saturated time lasts for 20ms or 40ms (the time can be select ed by the internal register bit TCOMP), protection is triggered . Then FF pulls low and SD pulls high to turn on the external P- MOSFET. The IC also latches off. Short VOUT to GND Protection When VOUT shorts to GND, the output voltage decreases. When the voltage of the OVP pin hits the OVP UVLO threshold for 10μs, the protection is triggered and SD pulls high to turn off the external P -MOSFET. VOUT disconnects from VIN and the IC latches off. Cycle-by-Cycle Current Limit To prevent the external components from exceeding the current stress rating, the IC has a cycle-by-cycle current limit protection. When the current exceeds the current limit value, the IC stops switching until the next clock cycle. Latch-Off Current Limit Protection Device damage may be caused by extreme conditions, such as an inductor or diode short to GND. To avoid this, the MP3367 provides a latch-off current limit protection when the current flowing through the internal MOSFET hits the threshold (7.5A), and lasts for five switching cycles. Thermal Protection To prevent the IC from damage when operating at exceedingly high temperatures, the MP3367 implements thermal protection by detecting the silicon die temperature. Over-Temperature LED Current Decrement When the die temperature exceeds 140°C, the MP3367 automatically decreases the LED current amplitude (see Figure 6).

140 Temperature (°C)

Figure 6: ILED Decrease with Temperature This function is enabled by the over-temperature current decrement bit (OTID). When OTID = 0, the over -temperature current decrement is disabled. When OTID = 1 (default), the over-temperature current decrement is enabled. Thermal Shutdown When the die temperature exceeds the upper threshold (TST), the IC shut s down. When the temperature drops b elow the lower threshold, the IC recovers to normal operation . The hysteresis value is typically 20°C. I2C Interface Register Description I2C Chip Address The 7-bit MSB device address is 0x38. After the start condition, the I2C-compatible master sends a 7-bit address followed by an eighth read (read: 1) or write (write: 0) bit. The following b it indicates the register address to/from which the data will be written/read: 0 01 1 1 0 R/W0 The I2C-Compatible Device Address

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 18 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. Register Mapping: Add D7 D6 D5 D4 D3 D2 D1 D0 00H OTID MODE1 MODE0 MIXTP MIXFR FSPMF1 FSPMF0 FSPR 01H PSEN TH_S1 TH_S0 FSW1 FSW0 CH2 CH1 CH0 02H SEN TCOMP FT_LEDG FT_OTP FT_UVP FT_OCP FT_LEDS FT_LEDO 03H ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 Note: Leave corresponding pins floating if internal registers are used.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 19 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. Table 1: Function Set Register 1 Addr: 0x00 Bit Bit Name Access Default Description

7 OTID RW 1

Over-temperature LED current decrement function enable bit. 0: Disabled 1: Enabled 6:5 MODE RW 00 Dimming mode selection bit. 00: Mix dimming 01: PWM dimming 10: Analog dimming 11: Reserved Float MIX/AD if this register is adopted.

4 MIXTP RW 0

Mix dimming transfer point selection bit. 0: 25% transfer point 1:12.5% transfer point

3 MIXFR RW 0

Mix dimming output frequency selection bit. 0: 200Hz 1: 23kHz 2:1 FSPMF1:0 RW 11 Frequency spread spectrum modulation frequency selection bit. 00: 1/100 of central frequency 01: 1/150 of central frequency 10: 1/200 of central frequency 11: Disable the frequency spread spectrum function Float FSP if this register is used.

0 FSPR RW 0

Frequency spread spectrum jitter range selection bit. 0: 1/20 of central frequency 1: 1/32 of central frequency Float FSP if this register is used.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 20 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. Table 2: Function Set Register 2 Addr: 0x01 Bit Bit Name Access Default Description

7 PSE RW 0

Phase shift enable bit. 0: Phase shift disabled 1: Phase shift enabled 6:5 TH_S1:0 RW 01 LED short protection threshold set bit. 00: 2.5V 01: 5V 10: 7.5V 11: 10V 4:3 FSW1:0 RW 01 Switching frequency set bit. 00: 200kHz 01: 400kHz 10: 1MHz 11: 2.2MHz Float FREQ if this register is used. 2:0 CH2:0 RW 000 Channel selection bit. 000: All six channels are in use 001: LED1-5 in use 010: LED1-4 in use 011: LED1-3 in use 100: LED1-2 in use 101: LED1 in use 110, 111: Reserved

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 21 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. Table 3: Fault Register Addr: 0x02 Bit Bit Name Access Default Description

7 SEN RW 0

Short all LED protection @ DPWM > 2%. 0: Disable 1: Enable

6 TCOMP RW 0

COMP-saturated time-select bit for short LEDX to GND. 0: 20ms 1: 40ms

5 FT_LEDG R 0

LEDX short to GND protection fault indication bit. If a fault occurs, the fault bit remains 1 until readback or power reset. 0: No fault 1: Fault The fault status can latch off until it is reset to 0 after this bit is read.

4 FT_OTP R 0

Over-temperature protection fault indication bit. If a fault occurs, the fault bit remains 1 until readback or power reset. 0: No fault 1: Fault The fault status can latch off until it is reset to 0 after this bit is read.

3 FT_UVP R 0

Output under-voltage protection fault indication bit. If a fault occurs, the fault bit remains 1 until readback or power reset. 0: No fault 1: Fault The fault status can latch off until it is reset to 0 after this bit is read.

2 FT_OCP R 0

Over-current protection fault indication bit. If a fault occurs, the fault bit remains 1 until readback or power reset. 0: No fault 1: Fault The fault status can latch off until it is reset to 0 after this bit is read.

1 FT_LEDS R 0

LED current source short fault indication bit. If a fault occurs, the fault bit remains 1 until readback or power reset. 0: No fault 1: Fault The fault status can latch off until it is reset to 0 after this bit is read.

0 FT_LEDO R 0

LED current source open fault indication bit. If a fault occurs, the fault bit remains 1 until readback or power reset. 0: No fault 1: Fault The fault status can latch off until it is reset to 0 after this bit is read.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 22 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. Table 4: ID Register Addr: 0x03 Bit Bit Name Access Default Description 7:0 ID7:0 R 01100111 Device ID bits.

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APPLICATION INFORMATION

The LED current amplitude is set by an external resistor connected from ISET to GND. The LED current amplitude setting is determined with Equation (4): ISET 1245ILED(mA) R (k )  (4) Where RISET = 24.9kΩ, and the LED current is 50mA. Switching Frequency The switching frequency can be programmed with a resistor, I2C interface, or external clock. To program the frequency using an external resistor on FREQ/SYNC, the switching frequency follows Equation (5):   SW OSC 22000f (kHz) R (k ) (5) For ROSC = 44.2kΩ, the switching frequency is set to 500kHz. Synchronize the switching frequency with an external clock to improve EMI, efficiency , and thermal performance. If setting the switching frequency bit (fSW1:0), 00: 200kHz; 01: 400kHz; 10: 1MHz; 11: 2.2MHz. Float FREQ if the fSW1:0 bit is used. Selecting the Input Capacitor The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. The input capacitor impedance at the switching frequency should be less than the input source impedance to prevent the high -frequency switching current from passing through to the input. Use ceramic capacitors with X5R or X7R dielectrics for their low ESR and small temperature coefficients. For most applications, a 10μF ceramic capacitor is sufficient. Selecting the Inductor The MP3367 requires an inductor to supply a higher output voltage while being driven by the input voltage. A higher value inductor results in less ripple current, lower peak inductor current , and less stress on the internal N-channel MOSFET. However, it also has a larger physical size, higher series resistance, and lower saturation current. Choose an inductor that does not saturate under worst-case load conditions. Select the minimum inductor value to ensure that the boost converter works in continuous conduction mode with high efficiency and good EMI performance. Calculate the required inductance value using Equation (6) and Equation (7): OUT SW LOAD η V D (1 D)L 2 f I (6)  IN OUT V D1 V (7) Where V IN and V OUT are the input and output voltages, fSW is the switching frequency, I LOAD is the LED load current, and η is the efficiency. With the given inductor value, the inductor DC current rating is at least 40% greater than the maximum input peak inductor current for most applications. The inductor ’s DC resistance should be as small as possible for higher efficiency. Selecting the Output Capacitor The output capacitor keeps the output voltage ripple small and ensures feedback loop stability. The output capacitor impedance must be low at the switching frequency. Ceramic capacitors with X7R dielectrics are recommended for their low ESR characteristics. For most applications, a 10μF ceramic capacitor is sufficient.

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 24 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL APPLICATION CIRCUITS

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C MP3367 Rev. 1.0 www.MonolithicPower.com 25 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.

PACKAGE INFORMATION

QFN-24 (4mmx4mm) PACKAGE OUTLINE DRAWING FOR 24L QFN (4X4mm) MF-PO-D-0049 revision 2.0 SIDE VIEW BOTTOM VIEW NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.08 MILLIMETERS MAX. 4) JEDEC REFERENCE IS MO-220 5) DRAWING IS NOT TO SCALE. PIN 1 ID MARKING TOP VIEW PIN 1 ID INDEX AREA RECOMMENDED LAND PATTERN PIN 1 ID 0.30X45° TYP 0.10x45º

MP3367 – 6-CHANNEL BOOST WLED DRIVER WITH HIGH DIM RATIO AND I2C NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third - party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP3367 Rev. 1.0 www.MonolithicPower.com 26 6/17/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION, OR GATE BURR. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) DRAWING CONFORMS TO JEDEC MO-153, VARIATION AET. 6) DRAWING IS NOT TO SCALE. DETAIL A 0o-8o

0.25 BSC

9.60 9.80 PIN 1 ID 4.30 4.50 6.20 6.60 1 14 1528 TOP VIEW SEE DETAIL "A" BOTTOM VIEW 2.60 3.10 5.40 5.90 0.19 0.30 SEATING PLANE

0.65 BSC

0.80 1.05 1.20 MAX 0.00 0.15 FRONT VIEW RECOMMENDED LAND PATTERN 5.80 TYP 1.60 TYP 0.40 TYP 0.65 BSC 3.20 TYP 6.00 TYP

Summary

6-Channel, Max.150mA/Ch Boost WLED Driver with 15000:1 Dim Ratio and I²C 6/17/2019 Rev. 1.0

Description