MPQ2483

MPQ2483 MPS | Alldatasheet

Document overview

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Technical content

Industrial/Automotive-Grade 55V, 2.5A Programmable Frequency LED Driver Avaiable in AEC-Q100 MPQ2483 Rev. 1.05 www.MonolithicPower.com 1 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. The Future of Analog IC Technology

DESCRIPTION

The MPQ2483 is a 55V, LED driver suitable for either step-down or inverting step-up/down applications. It achieves 2.5A peak current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes thermal shutdown, cycle-by-cycle peak current limiting, output over voltage protection, open strings protection and output short circuit protection. The MPQ2483 incorporates both DC and PWM dimming onto a single control pin. The separate input reference ground pin allows for direct enable and/or dimming control for a positive to negative power conversion. The MPQ2483 requires a minimum number of readily available standard external components and is available in a 10-pin 3mm x 3mm QFN and SOIC 14-pin packages.

FEATURES

• 2.5A Maximum Peak Current
• Buck or Buck-Boost Modes
• Wide 4.5V to 55V Operating Input Range
• 0.28Ω Internal Power MOSFET Switch
• Analog and PWM Dimming
• 0.198V Reference Voltage
• 5 μA Shutdown Mode
• Stable with Low ESR Capacitors
• Cycle-by-Cycle Over Current Protection
• Thermal Shutdown, Over Voltage, Short Circuit & Open String Protection
• AEC-Q100 Qualified

APPLICATIONS

• General LED Illumination
• LCD Backlight Panels
• Automotive Lighting All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 2 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved.

ORDERING INFORMATION

Part Number Package Top Marking MPQ2483DQ* QFN-10(3mmx3mm) MPQ2483DQ-AEC1 QFN-10(3mmx3mm) See Below MPQ2483DS** SOIC-14 MPQ2483DS-AEC1 SOIC-14 See Below * For Tape & Reel, add suffix –Z (e.g. MPQ2483DQ–Z). For RoHS compliant packaging, add suffix –LF (e.g. MPQ2483DQ–LF–Z) ** For Tape & Reel, add suffix –Z (e.g. MPQ2483DS–Z). For RoHS compliant packaging, add suffix –LF (e.g. MPQ2483DS–LF–Z) TOP MARKING (MPQ2483DQ) 9M: product code of MPQ2483DQ; Y: year code; W: week code: LLL: lot number; TOP MARKING (MPQ2483DS) MP2483DS: product code of MPQ2483DS; MPS: MPS prefix; YY: year code; WW: week code: LLL: lot number;

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 3 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. PACKAGE REFERENCE TOP VIEW VDD VSS OVP FB COMP SW BST INGND EN/DIM RSET NC VDD VSS OVP FB COMP NC NC SW BST INGND EN/DIM REST NC TOP VIEW QFN-10(3mmx3mm) SOIC-14 ABSOLUTE MAXIMUM RATINGS (1) Continuous Power Dissipation (TA = +25°C) (2) Recommended Operating Conditions (3) Supply Voltage VDD – VSS: Operating Junction Temp. (TJ). -40°C to +125°C 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 θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by P D (MAX) = (T J (MAX)-TA)/θJA. Exceeding the maximum allowable powe r 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 function is not guaranteed outside of the recommended operating conditions. 4) Measured on JESD51-7, 4-layer PCB.

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 4 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICES VIN = 12V, TJ = -40°C to +125°C, all voltages with respect to VSS. Typical values are at TJ = +25°C, unless otherwise noted. Parameters Symbol Condition Min Typ Max Units 4.5V ≤ VIN ≤ 12V 0.180 0.198 0.215Feedback Voltage VFB 12V ≤ VIN ≤ 55V 0.170 0.198 0.220 V Feedback Current IFB V FB = 0.22V 1.0 uA Switch-On Resistance RDS(ON) 280 m Ω Switch Leakage V EN = 0V, VSW = 0V 2 μA Current Limit (5) I LIM -40°C ≤ TJ ≤ 125°C Duty cycle ≤ 61% 2.7 3.0 A Oscillator Frequency fSW VFB = 0.19V, Rset=200kΩ 0.25 MHz Default oscillator frequency fSW_default VFB = 0.19V, Rset open 1.0 1.35 1.7 MHz Fold-back Frequency VFB = 0V, VOVP=0V, Rset open 250 kHz Maximum Duty Cycle V FB = 0.19V 90 % Minimum On-Time tON 100 ns Under Voltage Lockout Threshold Rising 2.9 3.3 3.7 V Under Voltage Lockout Threshold Hysteresis 200 mV EN Input Current V EN = 2V 1.4 μA EN OFF Threshold (w/Respect to INGND) V EN Falling 0.4 V EN ON Threshold (w/Respect to INGND) V EN Rising 0.6 V Minimum EN Dimming Threshold V FB = 0V 0.55 0.7 0.85 V Maximum EN Dimming Threshold V FB = 0.2V 1.2 1.4 1.55 V Supply Current (Quiescent) IQ VEN = 2V, VFB = 1V 0.8 1.5 mA Shutdown Current Ioff V EN=0V 3.4 20 μA Thermal Shutdown 150 °C Open LED OV Threshold VOVP_ th 1.1 1.2 1.3 V Open LED OV Hysteresis VOVP_ hys 60 mV Notes: 5) Derived from part characteri zation. Not tested in production.

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 5 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. PIN FUNCTIONS SOIC-14 Pin # QFN-10 (3mmx3mm) Pin # Name Description 2 1 VDD Supply Voltage. The MPQ2483 operates from a +4.5V to +55V unregulated input (with respect to VSS). C1 & C2 is needed to prevent large voltage spikes from appearing at the input. 3 2 VSS Power Return Pin. Connect to the lowe st potential in the circuit, which is typically the anode of the Schottky rectifie r. This pin is the voltage reference for the regulated output voltage. For this reason care must be taken in its layout. This node should be placed outside of the D1 to C1 & C2 ground path to prevent switching current spikes from inducing voltage noise into the part. The exposed pad is also connected to this pin. 4 3 OVP Over Voltage Protection Pin. Use a voltage divider to program OVP threshold. When the OVP pin voltage r eaches the shutdown threshold 1.2V, the switch will be turned off and will recover when OVP voltage decreases sufficiently. When the OVP pin voltage (w ith respect to VSS) is lower than 0.4V and FB pin voltage is lower than 0.1V , the chip recognizes this as short circuit condition and the operating frequency will be folded back. Program the OVP pin voltage from 0.4V to 1.2V for normal operation. 5 4 FB LED Current Feedback Input. MPQ2483 regulates the voltage across the current sensing resistor between FB and VSS. Connect the current sensing resistor from the bottom of the LED st rings to VSS. The FB pin is connected to the bottom of the LED strings. The regulation voltage is 0.198V. 6 5 COMP Output of error amplifier. Connect a 1nF or larger capacitor on COMP to improve the stability and to provide a soft on at start up and PWM dimming. 9 6 RSET Frequency Set Pin. Connect a resistor to VSS to set the switching frequency and a 1nF capacitor to VSS to bypass the noise. Leaving this pin open gets a default operating frequency 1.35MHz. 10 7 EN/DIM On/Off Control Input and Dimming Command Input. A voltage greater than 0.6V will turn on the chip. Both DC and PWM dimming are implemented on this pin. When the EN/DIM pin voltage (with respect to INGND) rises from 0.7V to 1.4V, the LED cu rrent will change from 0% to 100% of the maximum LED current. To use PWM dimming, apply a 100Hz to 2kHz square wave signal with amplitude greater than 1.4V to this pin. 11 8 INGND Input Ground Reference. This pin is the reference for the EN/DIM signal. 12 9 BST Bootstrap. A capacitor is connected between SW and BST pin to form a floating supply across the power switch driver. A 100nF or larger ceramic capacitor is recommended to provide sufficient energy to drive the power switch’s gate above the supply voltage. 13 10 SW Switch Output. SW is the source of the internal MOSFET switch. Connect this pin to the power inductor and the cathode of the Schottky rectifier. 1,7,8,14 NC No Connection. Exposed pad should be connected to VSS in step up/down mode.

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 6 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS VIN=20V, ILED=0.7A, two 3W LED in series, step down application, unless otherwise noted. 100 200 300 400 500 600 700 800 0 0.2 0.4 0.6 0.8 1 DIMMING DUTY LED CURRENT(mA) -100 100 200 300 400 500 600 700 800 0 400 800 1200 1600 VEN(mV) LED CURRENT(mA) 2.5 3.5 4.5 0 1 02 03 04 05 06 07 08 09 0 DUTY CYCLE(%) IPEAK (A) AMBIENT TEMPERATURE (oC) IQ vs. Temperature VFB vs. Temperature FSW vs. Temperature 500 600 700 800 900 1000 -40 -10 20 50 80 110 140 150 170 190 210 230 250 -40 -10 20 50 80 110 140 450 490 530 570 610 650 -40 -10 20 50 80 110 140 VFB (mV) SWITCH FREQUENCY (kHz) 100 0 1 02 03 04 05 0 3LE D 1LE D 2LE D Efficiency vs. Input Voltage

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 7 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN=20V, ILED=0.7A, two 3W LED in series, step down application, unless otherwise noted. VIN 10V/div. VOUT 5V/div. SW 10V/div. SW 10V/div. PWM 5V/div. IINDUCTOR 500mA/div. IINDUCTOR 500mA/div. IINDUCTOR 500mA/div.IINDUCTOR 500mA/div. IINDUCTOR 1A/div. IWLED 500mA/div. IWLED 500A/div. SW 10V/div. EN 5V/div. IWLED 500mA/div. SW 10V/div. EN 5V/div. IWLED 500mA/div. SW 10V/div. OVP 1V/div. ISHORT 2A/div. IINDUCTOR 2A/div. SW 10V/div. OVP 500mV/div. 400ns/div. 2ms/div. 40us/div. 4us/div. 20ms/div. 4us/div. Steady State PWM Dimming EN on EN off Open LED Protection Short Circuit Protection (short LED+ to INGND)

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 8 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN=20V, ILED=0.7A, seven 3W LED in series, Buck-boost application, referred to VSS, unless otherwise noted 700 800 0 200 400 600 800 1000 1200 1400 1600 100 200 300 400 500 600 700 800 0 0.2 0.4 0.6 0.8 1 01 02 03 04 05 0 100

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 9 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. FUNCTIONAL BLOCK DIAGRAM COMP M Figure 1: Functional Block Diagram

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 10 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. OPERATION The MPQ2483 is a current mode regulator. The EA output voltage is proportional to the peak inductor current. At the beginning of a cycle, M1(Fig1) is off. The EA output voltage is higher than the current sense amplifier output, and the current comparator’s output is low. The rising edge of the 1.35MHz CLK signal sets the RS Flip-Flop. Its output turns on M1(Fig1) thus connecting the SW pin and inductor to the input supply. The increasing inductor current is sensed and amplified by the Current Sense Amplifier. Ramp compensation is summed to the Current Sense Amplifier output and compared to the Error Amplifier output by the PWM Comparator. When the sum of the Current Sense Amplifier output and the Slope Compensation signal exceeds the EA output voltage, the RS Flip- Flop is reset and M1 is turned off. The external Schottky rectifier diode (D1) conducts the inductor current. If the sum of the Current Sense Amplifier output and the Slope Compensation signal does not exceed the EA output for a whole cycle, then the falling edge of the CLK resets the Flip-Flop. The output of the Error Amplifier integrates the voltage difference between the feedback and the 0.198V reference. The polarity is a FB pin voltage lower than 0.198V increases the EA output voltage. Since the EA output voltage is proportional to the peak inductor current, an increase in its voltage also increases the current delivered to the output. Open LED Protection If the LED is open, there is no voltage on the FB pin. The duty cycle will increase until OVP- VSS reaches the shutdown threshold set by the external resistor divider. The top switch will turn off till the voltage OVP-VSS decreases sufficiently. Dimming Control The MPQ2483 allows both DC and PWM dimming. When the voltage on EN is less than 0.6V, the chip is turned off. For analog dimming, when the voltage on EN is from 0.7V to 1.4V, the LED current will change from 0% to 100% of the maximum LED current. If the voltage on EN pin is higher than 1.4V, maximum LED current will be generated. For PWM dimming, its amplitude (VDIM – VINGND) must exceed 1.4V. The PWM frequency is recommended in range of 100Hz to 2kHz to get a good dimming linearity. Output Short Circuit Protection The MPQ2483 integrates output short circuit protection. When the output is shorted to VSS, the voltage on OVP pin which detects the output voltage gets smaller than 0.4V, and FB pin senses no voltage (<0.1V) as no current goes through the LED. At this condition, the operating frequency is folded back to decrease the power consumption.

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 11 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved.

APPLICATION INFORMATION

The external resistor is used to set the maximum LED current (see the schematic on front page) through the use of the equation: SENSE LED 0.198VR I= Setting the Operating Frequency The resistor on Rset pin is used to set the operating frequency. A 1nF capacitor is recommended to bypass this pin to GND. The relationship between the operating frequency and the Rest resistor is as the following curve. A 20k Ω to 200k Ω Rset resistor is recommended, which sets the operating frequency from around 1.35MHz to 250 kHz. Leaving the RSET pin open will set the operating frequency to the default operating frequency 1.35MHz. Selecting the Inductor (Step-Down Applications, see Figure 3) A 1µH to 47µH inductor with a DC current rating of at least 25% percent higher than the maximum load current is recommended for most applications. For high efficiency, the inductor’s DC resistance should be less than 200mΩ. Refer to Table 2 for suggested surface mount inductors. For most designs, the required inductance value can be derived from the following equation. SW L IN OUTINOUT f I V ) V V ( VL × Δ × − ×= Where ΔIL is the inductor ripple current. Choose the inductor ripple current to be 30% of the maximum load current. The maximum inductor peak current is calculated from: II I L LOAD) MAX ( L Δ+ = Under light load conditions below 100mA, a larger inductance is recommended for improved efficiency. Also note that the maximum recommended load current is 2A if the duty cycle exceeds 35%. 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 high frequency switching current from passing through the input. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. For most applications, a 4.7µF capacitor is sufficient. Selecting the Output Capacitor The output capacitor keeps the output voltage ripple small and ensures feedback loop stable. The output capacitor impedance should be low at the switching frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended for their low ESR characteristics. For most applications, a 2.2µF ceramic capacitor will be sufficient. Selecting VSS-INGND Positive Spike Protection Circuit In some applications, such as input power on, LED+ short circuit from LED+ to VSS in both Buck-Boost and Boost applications, when INGND and VSS are not connected together, there is potential risk that VSS-INGND has >0.3V (allowed maximum positive voltage) positive spike, which might cause false actions, even damage.

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 14 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. Figure 6: Step-up LED Driver Application

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY MPQ2483 Rev. 1.05 www.MonolithicPower.com 15 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved.

PACKAGE INFORMATION

QFN-10(3mmx3mm) SIDE VIEW TOP VIEW 110 6 5 BOTTOM VIEW 2.90 3.10 1.45 1.752.90 3.10 2.25 2.55 0.50 BSC 0.18 0.30 0.80 1.00 0.00 0.05

0.20 REF

1.70 0.50 0.25 RECOMMENDED LAND PATTERN

2.90 NOTE:

1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX. 4) DRAWING CONFORMS TO JEDEC MO-229, VARIATION VEED-5. 5) DRAWING IS NOT TO SCALE. PIN 1 ID SEE DETAIL A 2.50 0.70 PIN 1 ID OPTION B R0.20 TYP. PIN 1 ID OPTION A R0.20 TYP. DETAIL A 0.30 0.50PIN 1 ID INDEX AREA

MPQ2483 –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY NOTICE: The information in this document is subject to change wi thout notice. Users should warra nt and guarantee that third party Intellectual Property rights are not infringed upon w hen integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MPQ2483 Rev. 1.05 www.MonolithicPower.com 16 8/18/2015 MPS Proprietary Information. Patent Protec ted. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 0.016(0.41) 0.050(1.27)0o-8o DETAIL "A" 0.010(0.25) 0.020(0.50) x 45 o SEE DETAIL "A" 0.0075(0.19) 0.0098(0.25) 0.150 (3.80) 0.157 (4.00) PIN 1 ID 0.050(1.27) BSC 0.013(0.33) 0.020(0.51) SEATING PLANE 0.004(0.10) 0.010(0.25) 0.338(8.55) 0.344(8.75) 0.053(1.35) 0.069(1.75) TOP VIEW FRONT VIEW 0.228 (5.80) 0.244 (6.20) SIDE VIEW 1 7 14 8 RECOMMENDED LAND PATTERN 0.213 (5.40) 0.063 (1.60) NOTE: 1) CONTROL DIMENSION IS IN INCHES. DIMENSION IN BRACKET IS IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.004" INCHES MAX. 5) DRAWING CONFORMS TO JEDEC MS-012, VARIATION AB. 6) DRAWING IS NOT TO SCALE. 0.010(0.25) BSC GAUGE PLANE