MPQ2489DQ-LF-Z

MPQ2489 Step Down White LED Driver with Wide 6V–55V Input Voltage AEC-Q100 Qualified The Future of Analog IC Technology DESCRIPTION FEATURES The MPQ2489 is a high efficiency step-down converter designed in continuous current mode for driving the high brightness Light Emitting Diodes (LED) from wide input voltage 6V–55V. The MPQ2489 employs hysteretic control architecture to regulate a high accuracy LED current, which is measured through an external high-side current sensing resistor. Moreover, this control scheme provides optimized circuit stabilization and very quick response time without the loop compensation. Its low 202mV average feedback voltage reduces power loss and improves the converter efficiency.              The MPQ2489 implements PWM and analog dimming together with DIM pin. APPLICATIONS The MPQ2489 includes thermal overload protection preventing damage in the event of an output overload. The MPQ2489 is available in small QFN6 (3x 3mm) package.      Guaranteed Industrial/Automotive Temp Internal 60V MOSFET Wide 6V to 55V Input Range 1A Output Current High Efficiency (>95%) Hysteresis Control PWM & Analog Dimming 1000:1 PWM Dimming Resolution Thermal Shutdown Inherent Open LED Protection Short LED Protection Available in QFN6(3x 3mm) Package Available in AEC-Q100 Grade 1 Low Voltage Halogen Replacement Low Voltage General Illumination Automotive/Decorative LED Lighting Signs/Emergency Lighting LED Backlighting All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MPQ2489 Rev. 1.2 www.MonolithicPower.com 7/4/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 1 MPQ2489 – STEP DOWN WLED DRIVER WITH WIDE 6V~55V INPUT VOLTAGE, AEC-Q100 QUALIFIED ORDERING INFORMATION Part Number MPQ2489DQ* MPQ2489DQ-AEC1** Package QFN-6 (3x3mm) QFN-6 (3x3mm) Top Marking 9Y 9Y * For Tape & Reel, add suffix -Z (e.g. MPQ2489DQ-Z). For RoHS Compliant Packaging, add suffix -LF (e.g. MPQ2489DQ-LF-Z) ** For Tape & Reel, add suffix -Z (e.g. MPQ2489DQ-AEC1-Z). For RoHS Compliant Packaging, add suffix -LF (e.g. MPQ2489DQ-AEC1-LF-Z PACKAGE REFERENCE QFN-6 (3x 3mm) ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance (4) VIN, VSW ......................................... -0.3V to +60V VRS ................................................... VIN-5V to VIN All Other Pins ............................... -0.3V to +6.3V Continuous Power Dissipation (TA = +25°C) (2) QFN6 ........................................................... 2.5W Junction Temperature ............................... 150C Lead Temperature .................................... 260C Storage Temperature ................-65C to +150C QFN-6 (3mm x 3mm) ............. 50 ...... 14... C/W Recommended Operating Conditions (3) Supply Voltage VIN .............................. 6V to 55V Operating Junction Temp. (TJ). -40°C to +125°C 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 TJ(MAX), the junction-toambient thermal resistance θJA, 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 operation conditions. 4) Measured on JESD51-7, 4-layer PCB. MPQ2489 Rev. 1.2 www.MonolithicPower.com 7/4/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 2 MPQ2489 – STEP DOWN WLED DRIVER WITH WIDE 6V~55V INPUT VOLTAGE, AEC-Q100 QUALIFIED ELECTRICAL CHARACTERISTICS VIN = 24V, TJ = -40C to +125C unless otherwise noted. Typical values are at TJ = 25°C. Parameter Input Voltage Symbol Condition VIN Min 6 TJ =25°C Shutdown Supply Current ISD Quiescent Supply Current Internal Reference Voltage IQ VREF Feedback Reference Voltage (with respect to VIN) Feedback Reference Voltage Hysterisis EN/DIM Max Dimming Voltage EN/DIM Mim Dimming Voltage EN/DIM Enable High Voltage EN/DIM Enable Low Volatge EN/DIM Up-pulling Resistor Recommended PWM Dimming Frequency (5) Switch On Resistance Minimum On Time (6) Minimum Off Time (6) Recommended Maximum Operating Frequency Recommended Duty Cycle Range at FMAX (5) Start Up Time VIN = 24V Typ Max 55 85 108 TJ = -40°C to +125°C 130 No Switching TJ =25°C VIN-VRS VEN/DIM = 1.28V TJ = -40°C to +125°C 1.23 1.275 1 1.32 192 202 212 187 217 ±30 VFB_HYS VDIM_MAX VDIM_MIN VEN_HIGH VEN Rising VEN_LOW VEN Falling REN FPWM TSS 2 kHz 45 0.5 100 100 D 30 External capacitor on dim pin is 4.7nF 0.3 mV 0.3 0.16 FMAX mA V V V V V kΩ 0.3 RDS_ON TON_MIN TOFF_MIN µA mV 2.56 0.1 Units V Ω ns ns 600 kHz 70 % 0.5 ms Notes: 5) Application recommendation, no production test. 6) Design Guarantee, no production test. MPQ2489 Rev. 1.2 www.MonolithicPower.com 7/4/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 3 MPQ2489 – STEP DOWN WLED DRIVER WITH WIDE 6V~55V INPUT VOLTAGE, AEC-Q100 QUALIFIED PIN FUNCTIONS QFN6 Pin# 1 2, 5 3 4 6 Name Description The Drain of Internal MOSFET. Connecting the common terminal of inductor and anode of Schottky to this pin. GND Ground. Enable/Dimming Command Input. To use PWM dimming, apply a square wave signal to this pin. To use Analog dimming, apply a 0.3V–2.5V DC voltage to this pin. The voltage from 0.3V EN/DIM to 2.5V linearly controls the LED current range from 25% to 200%. Turn off the output current when pulling this pin below 0.2V. Connect a 1nF–10nF capacitor for normal operation (VEN/DIM=1.28V). LED Current Sense Input. Connecting the current sensing resistor that programs the LED RS average current to IN pin. IN Input Supply Pin. Connecting a proper decoupling capacitor from IN pin to GND. SW MPQ2489 Rev. 1.2 www.MonolithicPower.com 7/4/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 4 MPQ2489 – STEP DOWN WLED DRIVER WITH WIDE 6V~55V INPUT VOLTAGE, AEC-Q100 QUALIFIED TYPICAL PERFORMANCE CHARACTERISTICS VIN=30V, 3 LEDS in series, IOUT=550mA, unless otherwise noted. 1.0 250 1.5 0.8 230 1.4 0.6 210 1.3 0.4 190 1.2 0.2 170 1.1 0.0 -40 -10 20 50 80 110 140 150 -40 -10 20 50 80 110 140 1.0 -40 -10 20 50 80 110 140 50 60 10 300 1.2 270 1.1 240 1.0 2 210 0.9 -2 180 0.8 150 -40 0.7 -40 8 6 4 0 -4 -6 -8 -10 20 50 80 110 140 100 -10 20 50 80 110 140 0.8 0.8 85 0.6 0.6 80 0.4 0.4 75 0.2 0.2 10 20 30 40 50 60 00 30 40 1 1 90 70 20 1.2 1.2 95 -10 10 0.5 1 1.5 2 2.5 3 0 0.1 0.3 0.5 MPQ2489 Rev. 1.2 www.MonolithicPower.com 7/4/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 0.7 0.9 1.1 5 MPQ2489 – STEP DOWN WLED DRIVER WITH WIDE 6V~55V INPUT VOLTAGE, AEC-Q100 QUALIFIED TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED) VIN=30V, 3 LEDS in series, IOUT=550mA, unless otherwise noted. 500 VIN=30V 400 VIN=15V 300 200 100 0 0 20 40 60 80 100 PWM DIMMING DUTY (%) MPQ2489 Rev. 1.2 www.MonolithicPower.com 7/4/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 6 MPQ2489 – STEP DOWN WLED DRIVER WITH WIDE 6V~55V INPUT VOLTAGE, AEC-Q100 QUALIFIED FUNCTION DIAGRAM Figure 1—MPQ2489 Function Block Diagram MPQ2489 Rev. 1.2 www.MonolithicPower.com 7/4/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 7 MPQ2489 – STEP DOWN WLED DRIVER WITH WIDE 6V~55V INPUT VOLTAGE, AEC-Q100 QUALIFIED OPERATION Steady State System Soft Start The MPQ2489 is a hysteretic controlled step down LED driver that is easily to be configured in varies applications ranging from 6V–55V input. The converter employs a high side current sensing resistor to detect and regulate the LED current. The voltage across the current sensing resistor is kept measured and regulated in 202mV±30mV range. The voltage on the EN/DIM pin is the inductor current reference. An external capacitor from the EN/DIM pin to ground provides a soft-start delay. When VIN starts, internal voltage source charges the capacitor from 0V to 1.25V to fulfill soft-start function. The internal 1.275V reference voltage is utilized to provide a 0.2V reference for enabling the part and a 1.275V pulling-up voltage as current reference voltage. When VEN>0.2V, the output of the comparator becomes high and the other blocks are enabled. Output current is sensed by high-side resistor Rsense. When the switch is on, R2 is shorted and output current upper-threshold is fixed by R1. When the switch is off, output current lowerthreshold is fixed by R1 and R2. Ratio of R1 and R2 determines the current hysteresis. Enable Control Once Input voltage is applied, the internal 1.275V reference is connected to EN/DIM pin through pull up resistor. If EN/DIM is left open, the IC will automatically start up to the maxim brightness. Appling a capacitor on this pin can hereby program a soft start time. Dimming Control MPQ2489 provides two dimming methods: PWM dimming and DC analog dimming. To use PWM dimming, apply a square wave to the EN/DIM pin. To use analog dimming, apply a 0.3V–2.5V DC voltage to this pin. Maximum Continuous Switching Current MPQ2489 max continuous switching current depends on the package with different thermal resistance. The table 1 shows the max continuous current corresponding package for reference. Table 1. IMAX vs. Package Package QFN6 Imax(A) 1.41 If an external voltage range from 1.275V to 1.25V is applied to this pin, the current sensing voltage reference is linearly controlled from 0mV to 202mV. By controlling the EN/DIM pin voltage the analog dimming can be easily employed. If an external PWM voltage is applied on this pin, the IC will follow the PWM duty to achieve the PWM dimming, the PWM signal amplitude must be about 1.25V. About the flexible external PWM dimming method, please refer to the selecting dimming control mode section. MPQ2489 Rev. 1.2 www.MonolithicPower.com 7/4/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 8 MPQ2489 – STEP DOWN WLED DRIVER WITH WIDE 6V~55V INPUT VOLTAGE, AEC-Q100 QUALIFIED APPLICATION INFORMATION Setting the LED Current The LED current is identical and set by the current setting resistor between the IN pin and RS pin. RSET=202mV/ILED inductor current reference directly and linearly controls the inductor current range from 25% to 200%. (See Figure 2) VIN 6 IN TP4 EN/DIM For RSET=0.36Ω, the LED current is set to 550mA Selecting the Diode The output diode supplies current to the inductor when the internal MOSFET is off. To reduce losses due to diode forward voltage and recovery time, use a Schottky diode with the MPQ2489. The diode should be rated for a reverse voltage greater than the input voltage. The average current rating must be greater than the maximum load current expected, and the peak current rating must be greater than the peak inductor current. Selecting the Input Capacitor The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. A 10µF–22µF capacitor is enough for most application. The voltage rating should be greater than input voltage. A low ESR capacitor should be used for input decoupling. Selecting the Output Capacitor For most applications, output capacitor is not necessary. But if peak to peak ripple LED current is required less than 30% of average current, add a capacitor across the LEDs. Proportionally lower ripple can be achieved with higher capacitor value. A value of 2.2µF will meet most requirements. Selecting Soft-Start Capacitor With the soft-start capacitor, the delay time can be estimated by 0.2ms/nF. In PWM dimming, C