MPQ7220

MPQ7220 MPS | Alldatasheet

Document overview

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Technical content

6-Channel, Max 100mA/Ch Boost LED Driver, AEC-Q100 Qualified MPQ7220 Rev. 1.0 MonolithicPower.com 1 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.

DESCRIPTION

The MPQ7220 is a boost converter with six channel current sources . It is designed for driving automotive tail lights. The MPQ7220 uses peak current mode as its PWM control architecture. The switching frequency can be programmed by a resistor . It independently regulates the current in each LED string to the value set by an external current-setting resistor. The device applies six internal current sources, one in each LED string terminal to achieve a current balance with 2.5% current regulation accuracy between strings. The low headroom voltage for LED regulation and on resistance of switching MOSFETs allows for high efficiency. The MPQ7220 has rich protection modes to guarantee safe operation. Protection modes include OCP (over -current protection ), OVP (over-voltage protection), OTP (over - temperature protection), an d LED string short and open protection. The LED current decreases at high temperatures. The MPQ7220 is available in QFN -24 (4mmx4mm) and TSSOP28-EP packages.

FEATURES

 3.5V to 36V Input Voltage Range  Six Channels with Max 100mA per Channel  Internal 100mΩ, 50V MOSFET  Programmable Up to 2.2MHz fSW  External Sync SW Function  PWM Dimming (Dimming Frequency from 100Hz to 20kHz)  Excellent EMI Performance, Spread Spectrum  Disconnect VOUT from VIN  2.5% Current Matching  Cycle-by-Cycle Current Limiting  Programmable LED Short Threshold  Programmable OVP Threshold  LED Current Auto-Decrement at High Temperatures  LED Short/Open, OTP, OCP, Inductor Short Protection  Fault Indicator Signal Output  Available in QFN-24 (4mmx4mm) and TSSOP28-EP Packages  AEC-Q100 Grade 1

APPLICATIONS

 Automotive Tail Lights 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. “MP S”, the MPS logo, and “Simple, Easy Solutions” are trademarks of Monolithic Power Systems, Inc. or its subsidiaries.

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 2 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL APPLICATION DIM FREQ/SYNC EN AGND FF ISET LED6 LED5 LED3 LED2 LED1 SW PGND OVP STH FSP VCC SD VIN MPQ7220 VIN GND String 1 String 2 String 3 String 4 String 5 String 6 VOUT EN PWM LED4 COMP

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 3 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.

ORDERING INFORMATION

Part Number* Package Top Marking MSL Rating MPQ7220GR-AEC1 QFN-24 (4mmx4mm) See Below Level 1 MPQ7220GF-AEC1* TSSOP28-EP See Below Level 2a * For Tape & Reel, add suffix –Z (e.g. MPQ7220GR-AEC1-Z). Moisture Sensitivity Level Rating. * For Tape & Reel, add suffix –Z (e.g. MPQ7220GF-AEC1-Z), under qualification. TOP MARKING (MPQ7220GF-AEC1) MPS: MPS prefix YY: Year code WW: Week code MP7220: Part number LLLLLLLLL: Lot number TOP MARKING (MPQ7220GR-AEC1) MPS: MPS prefix Y: Year code WW: Week code MP7220: Part number LLLLLL: Lot number

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 4 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. PACKAGE REFERENCE TOP VIEW DIM FREQ/SYNC EN AGND AGND OVP STH SD FSP VIN VCC PGND LED4 LED1 LED2 AGND LED6 COMP FF ISET LED3 NC LED5 SW Exposed Pad TOP VIEW PGND DIM FREQ /SYNC FF Exposed Pad NC VCC AGND AGND OVP COMP AGND ISET STH FSP VIN SW NC NC LED1 LED2 LED3 EN SD NC LED4 LED5 LED6 NC QFN-24 (4mmx4mm) TSSOP28-EP PIN FUNCTIONS QFN24 Pin # TSSOP28- EP Pin # Name Description 1 5 DIM DIM signal input. Apply a PWM signal on DIM for brightness control. Pulled low internally. A 100Hz to 20kHz PWM signal is recommended. Pull this pin high if the dimming function not used. 2 2, 4, 6, 22, 24 NC Not connected. 3 7 FREQ/SYNC Switching frequency setting and SYNC pin. Connect a res istor between this pin and GND to set the converter’s switching frequency. Or connect an external clock to sync the boost switching frequency. 4 8 EN IC enable pin. Pull this pin to high enable the IC. Pull this pin low to force the IC to enter shutdown mode. 7 11 COMP Compensation pin. 8 12 FF Fault flag pin. Open drain during normal operation, pulled low in any fault mode. Float FF if not used. 9 13 ISET LED current setting. Tie a current-setting resistor from this pin to ground to program the current in each LED string. 5, 6, 10 9, 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.

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 5 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. PIN FUNCTIONS (continued) QFN24 Pin # TSSOP28- EP Pin # Name Description 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 pow er inductor to SW. 19 25 OVP Over-voltage protection pin. Use a voltage divider to program the OVP threshold (see the Application Information section on page 20). Do not float this pin. 20 26 STH Short LED protection threshold set pin. An 18µA current source flows out of this pin. Connect a resistor from STH to GND to set the protection threshold. The short protection threshold is 5V if this pin is floated. 21 27 FSP Switching frequency spread spectrum pin. An 18µA current source flows out of this pin. Connect a resistor from FSP to GND to set the voltage. If FSP < 0.4V, the jitter frequency is 1/20 of the central frequency. If FSP = 0.45V to 1.4V, the jitter frequency is 1/32 of the central frequency. If FSP > 1.4V or is floated, the frequency spread spectrum is disabled. 22 28 VCC 5V LDO output pin. VCC provides power for the internal logic and gate driver. Place a ceramic capacitor as close as possible to this pin to reduce noise. 23 1 SD External disconnect PMOS gate drive pin. Turn off the external PMOS in a fault condition. Float this pin if not used. 24 3 VIN Power supply input. VIN supplies the power to the IC. Exposed pad Exposed pad Exposed pad Exposed pad. It has no internal electrical connection to AGND and PGND. Connect exposed pad to external GND plane on board for optimal thermal performance.

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 6 7/30/2019 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) Electrostatic Discharge (ESD) HBM (human body model) Recommended Operating Conditions Operating junction temp (TJ) -40°C to +125°C (3) Thermal Resistance θJA θJC QFN-24 (4mmx4mm) TSSOP28-EP 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 di ssipation at any ambient temperature is calculated by P D (MAX) = (T J (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 circu itry protects the device from permanent damage. 3) Operation devices at junction temperature up to 150 °C is possible; contact MPS for details. 4) Measured on JESD51-7, 4-layer PCB. 5) Measured on MPS standard EVB of MPQ7220, 2-layer, 1oz. PCB.

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 7 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

VIN = 12V, VEN = 2V, TJ = -40°C to +125°C, typical values at TJ = 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 MOS on resistance RDS_LS VIN = 3.7V 100 mΩ SW leakage current ISW_LK VSW = 45V 1 μA Switching frequency fSW RFREQ = 10kΩ -10% 2.2 +10% MHz RFREQ = 46.8kΩ -10% 470 +10% kHz FREQ float -20% 400 +20% kHz FREQ voltage VFREQ -5% 0.6 +5% V FSP pull-up current IFSP 18 μA Maximum duty cycle DMAX fSW = 1MHz 90 % Cycle-by-cycle current limit ISW_LIMIT Duty = 90% 2.3 4 A Current limit protection ICL To trigger current limit protection 8 A SYNC input low threshold VSYNC_LO VSYNC falling 0.4 V SYNC input high threshold VSYNC_HI VSYNC rising 1.2 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

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 8 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS (continued) VIN = 12V, VEN = 2V, TJ = -40°C to +125°C, typical values at TJ = 25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Led Current Regulator LEDX regulation voltage VHD ILED = 20mA 300 mV ILED = 100mA 700 850 1000 mV Current matching (6) ILED = 20mA -2.5 +2.5 % ILED = 100mA -2.5 +2.5 % ISET voltage VISET 1.2 V LED current ILED RISET = 24.9kΩ, TJ = 25°C -2.5% 50 +2.5% mA RISET = 24.9kΩ, TJ = -40°C to +125°C, no over- temperature LED current decrement -4% 50 +4% mA 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 STH floating or VSTH = 0.5V 4.3 4.7 5.1 V LEDX over-voltage fault timer 6 7.7 10 ms LEDX UVLO threshold VLEDX_UV 100 mV Thermal shutdown threshold (7) TST Rising edge 170 °C Hysteresis 20 °C SD pull-down current ISD 40 55 70 µA SD voltage (with respect to VIN) VSD-IN VIN = 12V, VIN - VSD 6 V STH pull-up current ISTH STH pull-up current 18 μA Notes: 6) Matching is defined as the difference of the maximum to minimum current divided by the setting current. 7) Not tested in production. Guaranteed by design and characterization.

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 9 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL CHARACTERISTICS VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted. Shutdown Current vs. Temperature Quiescent Current vs. Temperature 0.0 10.0 20.0 30.0 40.0 50.0 60.0 -50 -30 -10 10 30 50 70 90 110 130 TEMPERATURE (oC) IST (nA) 1.5 2.5 3.5 4.5 5.5 6.5 7.5 -50 -30 -10 10 30 50 70 90 110 130 TEMPERATURE (oC) IQ (mA) VIN UVLO Threshold vs. Temperature Cycle-by-Cycle Current Limit vs. Temperature 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 -50 -30 -10 10 30 50 70 90 110 130 Rising Falling VIN_UVLO (V) TEMPERATURE (oC) 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 -50 -30 -10 10 30 50 70 90 110 130 TEMPERATURE (oC) ISW _LIMIT (A) Current Limit Protection vs. Temperature LS-FET On Resistance vs. Temperature 7.2 7.4 7.6 7.8 8.0 8.2 8.4 8.6 8.8 -50 -30 -10 10 30 50 70 90 110 130 TEMPERATURE (oC) ICL (A) 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 -50 -30 -10 10 30 50 70 90 110 130 TEMPERATURE (oC) RON_LS (mΩ)

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 10 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. TYPICAL CHARACTERISTICS VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted. Switching Frequency vs. Temperature OVP Threshold vs. Temperature 450 460 470 480 490 500 510 -50 -30 -10 10 30 50 70 90 110 130 TEMPERATURE (oC) fSW (KHz) 1.5 1.6 1.8 1.9 2.1 2.2 2.4 2.5 -50 -30 -10 10 30 50 70 90 110 130 TEMPERATURE (oC) VOVP (V)

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 11 7/30/2019 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 = 470kHz, ISET = 100mA, TA = 25°C, unless otherwise noted. Efficiency with 6P8S LED VLED = 23V, ILED = 6 x ISET Efficiency with 6P12S LED VLED = 34V, ILED = 6 x ISET 8 10 12 14 16 18 20 ISET=100mA ISET=50mA EFFICIENCY (% ) INPUT VOLTAGE (V) 9 12 15 18 21 24 27 30 ISET=100mA ISET=50mA EFFICIENCY (% ) INPUT VOLTAGE (V) Steady State ISET = 100mA Frequency Spread Spectrum 1/20 of the center frequency CH2: VOUT CH3: ILED CH4: IL CH1: VSW CH3: ILED CH2: VOUT CH4: IL CH1: VSW Start-Up through VIN ISET = 100mA Shutdown through VIN ISET = 100mA CH2: VIN CH3: ILED CH4: IL CH1: VSW CH2: VIN CH3: ILED CH4: IL CH1: VSW

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 12 7/30/2019 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 = 470kHz, ISET = 100mA, TA = 25°C, unless otherwise noted. Start-Up through EN ISET = 100mA Start-Up through EN ISET = 100mA CH2: VEN CH3: ILED CH4: IL CH1: VSW CH2: VEN CH3: ILED CH4: IL CH1: VSW PWM Dimming Steady State Dimming frequency = 100Hz PWM Dimming Steady State Dimming frequency = 2kHz CH2: VDIM CH3: ILED CH4: IL CH1:VSW CH2: VDIM CH3: ILED CH4: IL CH1:VSW PWM Dimming Start-Up through VIN PWM Dimming Shutdown through VIN CH2：VIN CH1：VDIM CH3: ILED CH4：IL R1：VSW CH2：VIN CH1：VDIM CH3: ILED CH4：IL R1：VSW

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 13 7/30/2019 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 = 470kHz, ISET = 100mA, TA = 25°C, unless otherwise noted. PWM Dimming On PWM Dimming Off CH2: VDIM CH3: ILED CH4:IL CH1:VSW CH2: VDIM CH3: ILED CH4:IL CH1:VSW All 6 Strings LED Open Power On All 6 Strings LED Open Entry CH3: VIN CH2: VFF CH4: IL CH1:VSW CH2: VFF CH3: ILED CH4: IL CH1:VSW

1 String LED Open Entry 1 String LED Open Recovery

CH2: VFF CH3: ILED CH4: IL CH1:VSW CH2: VFF CH3: ILED CH4: IL CH1:VSW

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 14 7/30/2019 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 = 470kHz, ISET = 100mA, TA = 25°C, unless otherwise noted. VOUT Short to LEDx Steady State VOUT Short to LEDx Entry CH3: ILED CH2: VFF CH4: IL CH1:VSW CH3: ILED CH2: VFF CH4: IL CH1:VSW VOUT Short to LEDx Recovery Short 1 String at Working CH3: ILED CH2: VFF CH4: IL CH1:VSW CH3: ILED CH2: VFF CH4: IL CH1:VSW Short 1 String Recovery LEDx Short to GND Entry CH3: ILED CH2: VFF CH4: IL CH1:VSW CH2: VFF CH3: ILED CH4: IL CH1:VSW

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 15 7/30/2019 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 = 470kHz, ISET = 100mA, TA = 25°C, unless otherwise noted. Inductor Short Entry CH2: VFF CH3: ILED CH4: IL CH1:VSW

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 16 7/30/2019 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 Control Fault Control BG & Logic REF 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 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 1: Functional Block Diagram

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 17 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. OPERATION The MPQ7220 employs 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 MPQ7220 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 VIN, EN, and D IM are enabled, the MPQ7220 checks the topology connection. First, the IC draws current from the SD pin to enable the input disconnect PMOS turn-on (If this MOS is used) . After a 500µs delay, t he IC monitors the OVP pin to see whether the output is shorted to GND or not . If the OVP voltage is less than 100mV, the IC is disabled and latches off. After that, the MPQ7220 continues to check other safety limits, such as LED open and over- voltage protection . If all the protection tests pass, the IC then starts boosting the step -up converter with an internal soft start. The recommended power-on sequence is the following: VIN  EN  PWM dimming signal. Step-Up Converter The MPQ7220 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 on time is about 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 LED x pin voltage to provide a high enough output voltage to power all the LED arrays. If the feedback voltage drops below the reference, the output of the error amplifier increases. This results in more current flowing through the MOSFET, thus increasing the power delivered to the output. This fo rms a closed loop that regulates the output voltage. Under light -load conditions, especially in the case of VOUT ≈ VIN, the converter runs in pulse - skipping mode where the MOSFET turns on for a minimum on time, and 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. LED Current Setting The LED current amplitude is set by an external resistor from ISET to GND . The LED current amplitude setting follows Equation (1): )(kR 1245(mA)I ISET LED  (1) For RISET = 12.4kΩ, the LED current is 100mA. PWM Dimming Control By applying a PWM signal to the DIM pin, the amplitude of the LED current remains at ISET. The LED current is chopped by the input PWM signal, applying an external 100Hz to 2 0kHz PWM waveform to DIM for PWM dimming. During PWM dimming, the part stops switching when DIM is below 0.4V and the LED current is zero. The part resumes normal operation with a nominal LED current when DIM exceeds 1.2V. Unused LED Channel Setting The MPQ7220 automatically detect s the unused LED string and remove s it from th e control loop during start -up by connecting the LEDx pin of an unused channel to GND. If employing 5 strings, connect the LED6 to GND. If using 4 strings, connect the LED5 and LED6 to GND, and so on. Frequency Spread Spectrum The MPQ7220 uses switching frequency jitter to spread the switching frequency spectrum. It

MPQ7220 – 6 Channels Boost LED Driver with Max 100mA/Channel MPQ7220 Rev. 1.0 MonolithicPower.com 18 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. reduces the spectrum spike around the switching frequency and its harmonic frequencies. The FSP pin can program the dithering range, and the modulation frequency is fixed t o 1/150 of the switching frequency. FSP is a current - source output (18μA). Connect a resistor to program its voltage. If FSP < 0.4V, the jitter frequency is 1/20 of the central frequency. If FSP = 0.45V to 1.4V, the jitter frequency is 1/32 of the central frequency. If FSP > 1.4V or is left floating, the frequency spread spectrum is disabled. Programming and Synchroniz ing the Switching Frequency The switching frequency is programmed through an external resistor or an external clock on the FREQ/SYNC pin . The switching frequency can be determined with Equation (2): )(kR 22000(kHz)F FRE SW  (2) For R OSC = 46.4kΩ, the switching frequency is set to 470kHz. Synchronize the switching frequency using an external clock to improve EMI, efficiency, and thermal performance. Protection The MPQ7220 includes open string protection, short string protection, short LED x to GN D protection, over-current protection, short out to GND protection , and thermal protection. Once the protection is triggered, the fault flag (FF) pin pulls to GND. FF is released to high with a 750μs delay after the IC rec overs from protection. Open String Protection Open string protection is achieved through detecting the voltage of the OVP pin and the LED1-6 pins. During operation, i f one string is open, the respective LED x pin voltage is pulled low to ground . The IC keeps charging the output voltage unt il it reaches the over -voltage protection (OVP) threshold. If the OVP point has been triggered, the chip stops switching and marks off the fault string that has an LEDx pin voltage below 100mV. Once marked , the remaining LED strings force the output voltag e back into normal regulation. The string with the largest voltage drop determines the output regulation value. The marked-off string sends a 10μs pulse current to check whether an open fault is removed after every 500μs delay, so open string protection is recoverable. Short String Protection The MPQ7220 monitors the LED x pin voltages to determine whether a short string fault has occurred. If one or more strings are shorted, the respective LED x pins tolerate high voltage stress. If a n LEDx pin voltage exceeds the protection threshold , an internal counter is started. If this fault condition lasts for 7.7ms, the fault string is marked off and disabled. Once a string is marked off, it disconnects from the output voltage loop until the short is removed. The sho rt protection threshold is set by the external STH pin. An 18µA current flows out of the pin. Connect a resistor from STH to AGND to get a voltage (VSTH). The threshold is 10 times V STH when V STH < 1.4V. When STH is floating or V STH > 1.4V, the short prote ction threshold is set to 5V. When all LEDx voltages exceed the threshold for 480ms, all strings are marked off. The IC is on standby until the strings release from shorting. Short LEDx to GND Protection When LEDx shorts to GND, the COMP voltage increases and saturates. When the COMP saturated time lasts for 20ms, protection is triggered, the FF pin pulls low, and the SD pin is pulled high to turn off the external P - MOSFET. The IC also latches off. Short VOUT to GND Protection When V OUT shorts to GND, the OVP voltage decreases and kicks the low threshold for 10μs. Then the protection is triggered. The SD pin is pulled high to turn off the external P -MOSFET, and VOUT is disconnected from VIN. Cycle-by-Cycle Current Limit To prevent the external c omponents from exceeding the current stress rating, the IC has cycle-by-cycle current limit protection. When the

MPQ7220 – 6 Channels Boost LED Driver with Max 100mA/Channel MPQ7220 Rev. 1.0 MonolithicPower.com 19 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. current exceeds the current limit value, the IC stops switching until the next clock cycle. Latch-Off Current Limit Protection Extreme conditio ns like excess current or an inductor short may cause device damage . Therefore, the MPQ7220 provides a latch -off current limit protection when the current flowing through an internal MOSFET reaches the threshold (8A) and lasts for five switching cycles. Thermal Protection To prevent the IC from damage when operating at exceeding ly high temperatures, thermal protection is implemented in this chip by detecting the silicon die temperature. Over-Temperature LED Current Decrement When the die temperature exce eds 140°C, the MPQ7220 automatically decreases the LED current amplitude.

140 Temperature (°C)

100% Brightness Figure 2: ILED Decreases with Temperature Thermal Shutdown When the die temperature exceeds the upper threshold (TST), the IC shut s down. It recovers to normal operation when the die temperature drops below the lower threshold. The hysteresis value is typically 20°C.

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL MPQ7220 Rev. 1.0 MonolithicPower.com 20 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved.

APPLICATION INFORMATION

The LED current amplitude is set by an external resistor connected from ISET to GND. The LE D current amplitude settin g is determined with Equation (3): )(kR 1245(mA)I ISET LED  (3) For RISET = 12.4kΩ, the LED current is 100mA. Setting the Over-Voltage Protection (OVP) The voltage divider set s the over -voltage protection (OVP) point (see Figure 3). Calculate VOVP with Equation (4): OVP R RRV(V)V 2 (4) Normally, the OVP point is set about 10% to 30% higher than the LED voltage. Switching Frequency The frequency can be programed by an external resistor or an external clock on the FREQ/SYNC pin. Calculate the switching frequency using Equation (5): SW FRE For R FRE = 46.4 kΩ, the switching frequency is set to 470kHz. Synchronize the switching frequency using an external clock to improve EMI, efficiency, and thermal performance. Selecting the Input Capacitor The input capacitor reduces the surge current drawn from the inpu t 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 MPQ7220 requires an inductor to supply a higher output voltage while being driven by the input voltage. A larger -value inductor results in less ripple current, lower peak inductor current, and less stress on the internal N -channel MOSFET. However, the larger -value inductor 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 VIN and V OUT are the input and output voltages, respectively. fSW is the switching frequency, ILOAD 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.

MPQ7220 – 6 Channels Boost LED Driver with Max 100mA/Channel MPQ7220 Rev. 1.0 MonolithicPower.com 22 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. CARRIER INFORMATION QFN-24 (4mmx4mm) TSSOP28-EP Part Number Package Description Quantity/Reel Quantity/Tube Reel Diameter Carrier Tape Width Carrier Tape Pitch MPQ7220GR QFN-24 (4mmx4mm) 2500 NA 13in. 12mm 8mm MPQ7220GF TSSOP28-EP 2500 50 13in. 16mm 8mm

MPQ7220 – 6 Channels Boost LED Driver with Max 100mA/Channel MPQ7220 Rev. 1.0 MonolithicPower.com 23 7/30/2019 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

MPQ7220 – 6-CHANNEL BOOST LED DRIVER WITH MAX 100mA/CHANNEL NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. 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. MPQ7220 Rev. 1.0 MonolithicPower.com 24 7/30/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. PACKAGE OUTLINE DRAWING FOR 28-TSSOP w/ EXPOSED PADDLE MF-PO-D-0055 revision 2.0 SIDE VIEW 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” 0.45 0.750o-8o

0.25 BSC

9.60 9.80 PIN 1 ID 4.30 4.50 6.20 6.60 1 14 1528 TOP VIEW 0.09 0.20 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 100mA/Ch Boost LED Driver, AEC-Q100 Qualified 7/30/2019 Rev. 1.0

Description