MP3362GJ-Z

MP3362 Single-String, 3V Minimum VIN, 36V VOUT, Boost LED Driver DESCRIPTION FEATURES The MP3362 is a fixed-frequency converter ideal for low-current and high-current boost applications. The low 0.2V feedback voltage offers higher efficiency in white LED driver applications. • • • • • • • • • • • • • • The MP3362 regulates the output voltage up to 36V with efficiency as high as 95%. Current mode regulation and external compensation components allow the MP3362 control loop to be optimized across a wide variety of input voltages. The MP3362 supports analog dimming and PWM dimming on the same pin. A 5kHz input initiates analog dimming. 3V to 36V Input Voltage Range 4A Peak Current Limit 0.3μA Shutdown Current Low 200mV Feedback Voltage Configurable 200kHz to 2.2MHz fSW Internal 80mΩ, 40V Power Switch High Efficiency Analog and PWM Dimming Under-Voltage Lockout Protection Open/Short LED Protection Short FB Protection Soft-Start Operation Thermal Shutdown Available in a TSOT23-8 Package APPLICATIONS Soft start, cycle-by-cycle current limiting, and input under-voltage lockout prevent overstressing or damaging sensitive external circuitry during start-up or potential overload current conditions. • • Medium-Sized LCD Backlighting General Lighting All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are trademarks of Monolithic Power Systems, Inc. or its subsidiaries. The MP3362 is available in a TSOT23-8 package. TYPICAL APPLICATION L1 + Efficiency D1 VIN fSW = 1MHz, 10 LEDs, ILED = 200mA, L = 4.7μH/9.5mΩ + CIN COUT ROVP1 1 ROVP2 GND 8 2 VIN OVP 7 3 COMP FB 6 4 EN/DIM OSC/ SYNC 5 CCOMP 0.9 EFFICIENCY 1 SW ROSC RFB 0.8 0.7 0.6 0 5 10 15 20 25 30 V IN (V) MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 1 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER ORDERING INFORMATION Part Number MP3362GJ Package TSOT23-8 Top Marking See Below MSL Rating 1 * For Tape & Reel, add suffix -Z (e.g. MP3362GJ-Z). TOP MARKING BJF: Product code of MP3362GJ Y: Year code PACKAGE REFERENCE TOP VIEW TSOT23-8 MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 2 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER PIN FUNCTIONS Pin # 1 2 3 4 5 6 7 8 Name Description Output switch node. SW is the drain of the internal N-channel MOSFET. Connect the SW inductor and rectifier to SW to complete the boost converter. Input supply pin. This pin can be connected to the regulator’s input supply or to the output VIN for bootstrap operation. Error amplifier output compensation. Connect the COMP pin to a series RC network to COMP compensate the regulator control loop. Enable and dimming pin. Used the EN/DIM pin to enable/disable the device, or to initiate PWM dimming or analog dimming. The following conditions determine how this pin operates: EN/ 1. Keep the EN/DIM pin low for 20ms to disable the IC. DIM 2. Apply a 5kHz PWM signal frequency to make the IC work in analog dimming mode. Switching frequency setting and synchronization pin. Connect a resistor to this pin to OSC/ program the switching frequency. Apply a pulse signal between 200kHz and 2.2MHz to SYNC synchronize the switching frequency. FB Regulation feedback input. The regulation threshold is 0.2V. Open LED protection pin. OVP pin senses the output voltage to protect the IC during open OVP LED operation. GND Ground. MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 3 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER θJA θJC ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance (4) VIN, VSW ......................................-0.3V to +40V All other pins ................................-0.3V to +5.3V Continuous power dissipation (TA = 25°C) (2) TSOT23-8 ................................................ 1.25W Junction temperature ................................150°C Lead temperature .....................................260°C Storage temperature……..…… -65°C to +150°C TSOT23-8……….…................…100........55...°C/W ESD Ratings Human body model (HBM) ................... ±2000V Charged device model (CDM)................±1000V Recommended Operating Conditions (3) Supply voltage (VIN) ............................ 3V to 36V Maximum LED load voltage (VLED) ............... 36V Operating junction temp ........... -40°C to +125°C MP3362 Rev. 1.1 2/22/2023 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 produce an excessive die temperature, causing the regulator to go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 4 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER ELECTRICAL CHARACTERISTICS VIN = 5.0V, TA = 25°C, unless otherwise noted. Parameter Symbol IN shutdown supply current IN operating supply current IN under-voltage lockout threshold IN under-voltage lockout hysteresis EN/DIM input low voltage EN/DIM input high voltage EN/DIM input bias current EN shutdown time SW switching frequency SW maximum duty cycle Error amplifier transconductance COMP maximum output current FB regulation threshold FB input bias current SW on resistance SW current limit SW leakage current OVP threshold OVP hysteresis OVP under-voltage threshold IQ1 IQ2 VUVLO Condition Min VEN ≤ 0V VEN > 2V, VFB = 0.5V With switching, 400kHz VIN rising 2.35 VUVLO_HYS VEN_L VEN_H IEN tEN fSW Typ Max Units 0.3 1 1.5 1.25 2.5 μA mA mA 2.5 2.65 V 100 mV 0.4 1.3 VEN = 5V EN/DIM low to disable IC ROSC = 100kΩ VFB = 0.15V, fSW = 400kHz 16 360 90 GEA IEA Sourcing and sinking VFB IFB RON ILIM ISW 100% analog dimming VFB = 0.5V VIN = 4V Duty = 80% 20 400 93 7 24 440 V V μA ms kHz % 250 μA/V 30 μA 196 200 3.4 80 4 204 0.2 4.6 mV μA mΩ A 0.3 μA 1.26 VOVP_HYS 1.18 100 V mV VOVP_UV 50 100 mV 600 660 mV VSW = 40V VOVP 1.10 VFB > VSP, short load protection is triggered Short load protection VSP 540 Latch-off current limit Thermal shutdown (5) Thermal shutdown hysteresis ICL TSD 6.5 170 A °C TSD_HYS 20 °C Note: 5) Guaranteed by design. MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 5 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER TYPICAL PERFORMANCE CHARACTERISTICS VIN = 10V, 10 LEDs, ILED = 200mA, fSW = 1000kHz, TA = 25°C, unless otherwise noted. Efficiency fSW = 1MHz, 10 LEDs, ILED = 200mA, L = 4.7μH/9.5mΩ 1 EFFICIENCY 0.9 0.8 0.7 0.6 0 5 10 15 20 25 30 V IN (V) MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 6 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 10V, 10 LEDs, ILED = 200mA, fSW = 1000kHz, TA = 25°C, unless otherwise noted. Steady State Steady State VIN = 3V, load = 3 LEDs CH1: VSW VIN = 10V, load = 10 LEDs CH1: VSW CH2: VOUT CH3: IL CH2: VOUT CH3: IL CH4: ILED CH4: ILED VIN Start-Up CH1: VSW VIN Shutdown CH1: VSW CH2: VOUT CH2: VOUT CH3: IL CH3: IL CH4: ILED CH4: ILED EN Off EN On CH1: VSW CH1: VSW CH2: VEN CH3: IL CH2: VEN CH3: IL CH4: ILED CH4: ILED MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 7 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 10V, 10 LEDs, ILED = 200mA, fSW = 1000kHz, TA = 25°C, unless otherwise noted. PWM Start-Up PWM Shutdown fPWM = 10kHz (D = 0.5) fPWM = 10kHz (D = 0.5) CH1: VSW CH1: VSW CH2: VPWM CH2: VPWM CH3: IL CH3: IL CH4: ILED CH4: ILED PWM Dimming PWM Dimming fPWM = 200Hz (D = 0.5) fPWM = 2kHz (D = 0.5) CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH3: IL CH3: IL CH4: ILED CH4: ILED Analog Dimming OVP during Normal Operation fPWM = 5kHz (D = 0.5) CH1: VSW CH1: VSW CH2: VPWM CH3: IL CH2: VOUT CH3: IL CH4: ILED CH4: ILED MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 8 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 10V, 10 LEDs, ILED = 200mA, fSW = 1000kHz, TA = 25°C, unless otherwise noted. Short Inductor in Normal Operation and Recovery Load = 5 LEDs CH1: VSW CH2: VOUT CH3: IL CH4: ILED MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 9 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER FUNCTIONAL BLOCK DIAGRAM D1 L1 SW C1 VIN C2 UVLO and Internal Regulator GND EN/DIM BG and EN Dimming ROVP1 Control and Gate Driver ROVP2 OSC/SYNC OSC SLOPE ILIM OVP OVP 1.2V REF FB COMP Figure 1: Functional Block Diagram MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 10 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER OPERATION The MP3362 drives the internal MOSFET with current mode architecture to regulate the LED current, which is measured through an external current-sense resistor. The MP3362 employs a special circuit to regulate the internal power supply, which covers a wide input voltage range. The switching frequency can be configured. The device integrates undervoltage lockout (UVLO), over-voltage protection (OVP), over-current protection (OCP), short LED protection, short FB to GND protection, short inductor/diode protection, and thermal protection. Step-Up Converter The MP3362 uses peak current control mode to regulate the output energy. At the beginning of each switching cycle, the internal clock turns on the internal N-channel MOSFET (in normal operation, the minimum turn-on time is about 50ns). A stabilizing ramp is added to the output of the current-sense amplifier to prevent subharmonic oscillations for duty cycles exceeding 50%. This result is fed into the PWM comparator. If the summed voltage reaches the output voltage of the error amplifier, the internal MOSFET turns off (for improved stability, the turnoff time should exceeds 100ns). The output voltage of the internal error amplifier is an amplified signal of the difference between the reference voltage and the FB voltage. If the feedback voltage drops below the reference voltage, the output of the error amplifier increases. This results in more current flowing through the MOSFET, which increases the power delivered to the output. This forms a closed loop that regulates the output voltage. If VOUT is almost equal to VIN under light-load conditions, the converter runs in pulse-skip mode. The MOSFET turns on for a minimum on time, and then the converter discharges the power to the output for the remaining period. The internal MOSFET remains off until the output voltage requires another boost. Soft Start The MP3362 implements soft start by limiting the current capability of the internal error amplifier during start-up. The COMP voltage jumps to its MP3362 Rev. 1.1 2/22/2023 clamp voltage at the beginning of start-up. The source/sink current of the internal error amplifier is limited to about 10µA until the FB voltage reaches 80% of the internal reference voltage during startup. The maximum soft-start time is limited to 10ms to prevent the IC from always being in soft start during deep analog dimming. VIN VEN/DIM VCOMP 0.8 x ILED ILED Figure 2: Soft Start Enable (EN) and Dimming (DIM) The EN/DIM pin can be used for different functions when different signals are applied on this pin. These functions are described below: 1. Enable/disable: If the EN/DIM pin is pulled high, the IC is enabled; if the EN/DIM pin is pulled low for 20ms, the IC is disabled. 2. PWM dimming (fPWM < 2kHz): If the PWM signal has a frequency below 2kHz, the IC operates in PWM dimming mode. If the PWM signal is low in PWM dimming mode, the IC stops switching, and the output voltage and output current drop. If the PWM signal is high, the IC starts switching, and the output voltage and output current begin to rise. This condition prohibits soft start. 3. Analog dimming (fPWM > 5kHz): If the PWM signal has a frequency exceeding 5kHz, the IC operates in analog dimming mode. The LED current can be changed by changing the PWM duty cycle. www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 11 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER Calculate the LED current with Equation (1): ILED = VFB  Duty RFB (1) Where VFB is the FB voltage (about 200mV), RFB is the feedback resistor, and Duty is the PWM signal duty. Protections The MPQ3326’s protections include undervoltage lockout (UVLO), over-voltage protection (OVP), over-current protection (OCP), short LED protection, short FB-to-GND protection, short inductor/diode protection, and thermal protection. Under-Voltage Lockout (UVLO) The MP3362 integrates VIN under-voltage lockout (UVLO) protection. The internal circuit does not work until VIN reaches the UVLO rising threshold. Over-Voltage Protection (OVP) Over-voltage protection (OVP) is detected by sensing the voltage on the OVP pin. If the OVP pin’s voltage reaches its high threshold, OVP is triggered and the IC stops switching. The IC tries to recover when the OVP pin’s voltage drops to its low threshold. Short Load Protection Under short load conditions, a large short current is detected by the FB sense resistor. If the FBsensed voltage exceeds 600mV for 20 switching cycles, short load protection is triggered and the IC stop switching. The IC resumes when the short disappears. Note that there is a short loop from the input to GND under short load conditions. Use a fuse or an external circuit to cut off the short loop. OVP Pin Under-Voltage Protection (UVP) If the OVP pin’s voltage drops below 60mV for 10µs during normal operation, under-voltage protection (UVP) is triggered, and the IC stops switching. This protection is blanked during soft start. Over-Current Protection (OCP) (Short Inductor/ Diode Protection) The MP3362 implements cycle-by-cycle current limit protection. If there is an inductor or diode short, and the MOSFET’s current exceeds the latch-off current limit value (typically 6.5A) for seven consecutive cycles, over-current protection (OCP) is triggered. The IC stop switching and resumes when the short disappears. Short FB to GND Protection If the FB voltage drops below 50mV and the COMP saturation lasts for 20ms, the IC stops switching. The IC resumes normal operation when the short disappears. Thermal Protection Thermal shutdown prevents the MP3362 from operating at exceedingly high temperatures. If the die temperature exceeds the upper threshold (TSD = 170°C), COMP is pulled low. The IC resumes normal operation once the die temperature drops below its lower threshold. The hysteresis is about 20°C. High voltage appears on the FB pin under short load conditions. Figure 3 shows additional components that are required to protect the FB pin from damage. R1 FB FB D1 a) D1 RFB RFB b) Figure 3: Short Load Protection for the FB Pin MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 12 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER APPLICATION INFORMATION LED Current Setting The LED current is set by the feedback resistor (RFB). RFB can be calculated with Equation (2): RFB = 200mV ILED (2) Switching Frequency Setting The switching frequency (fSW) is set by an external resistor (ROSC) at the OSC/SYNC pin. fSW can be estimated with Equation (3): 40000 fSW (kHz) = ROSC (k) (3) A PWM signal (200kHz to 2.2MHz) on the OSC/SYNC pin can also synchronize fSW. Selecting the Inductor The minimum inductance to make the circuit work in continuous conduction mode (CCM) can be calculated with Equation (4): L= VIN  (VO − VIN) VO  IL  fsw (4) Where ∆IL is the peak-to-peak current of the inductor. If the inductance is below this minimum value, the circuit works in discontinuous conduction mode (DCM). Design ∆IL to be between 30% and 60% of the average inductor current, estimated with Equation (5): IL_AVG= VO  ILED VIN (5) Ensure that the saturated inductor current exceeds the inductor peak current, estimated with Equation (6): 1 IL_PK=IL_AVG+ IL 2 MP3362 Rev. 1.1 2/22/2023 Over-Voltage Protection (OVP) Setting Set the over-voltage-protection (OVP) voltage threshold above 10% to 20% of the output voltage. The OVP voltage can be set with a voltage divider (see the Typical Application Circuit section on page 15). The threshold can be calculated with Equation (7): VOVP(V)= ROVP1 + ROVP2  1.2(V) ROVP2 (7) Selecting the Diode Choose a diode with voltage rating greater than the OVP point, and leave a 20% margin. The current rating should be approximately two to three times greater than the LED current. Selecting the Input Capacitor The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. Ceramic capacitors with X7R dielectrics are recommended due to their low ESR and small temperature coefficients. Select a capacitor that limits the input voltage ripple (∆VIN) below 5% to 10% of its DC value. The capacitance can be calculated with Equation (8): CIN  IL 8  VIN  fsw (8) Selecting the Output Capacitor Select an output capacitor that limits the output voltage ripple (∆VO) below 1% to 5% of its DC value, and ensures feedback loop stability. The capacitance can be estimated with Equation (9): COUT  ILED  (VO − VIN) VO  fsw  VO (9) (6) www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 13 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER TYPICAL APPLICATION CIRCUITS MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 14 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER PACKAGE INFORMATION TSOT23-8 See note 7 EXAMPLE TOP MARK PIN 1 ID IAAAA RECOMMENDED LAND PATTERN TOP VIEW SEATING PLANE SEE DETAIL ''A'' FRONT VIEW SIDE VIEW NOTE: DETAIL ''A'' MP3362 Rev. 1.1 2/22/2023 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) JEDEC REFERENCE IS MO-193, VARIATION BA. 6) DRAWING IS NOT TO SCALE. 7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK FROM LEFT TO RIGHT, (SEE EXAMPLE TOP MARK) www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 15 MP3362 – SINGLE-STRING, 3V MINIMUM Vin, 36V BOOST LED DRIVER CARRIER INFORMATION ABCD Pin1 1 ABCD ABCD 1 1 ABCD 1 Feed Direction Part Number Package Description Quantity/ Reel Quantity/ Tube Quantity/ Tray Reel Diameter MP3362GJ–Z TSOT23-8 3000 N/A N/A 7in MP3362 Rev. 1.1 2/22/2023 Carrier Tape Width 8mm www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. Carrier Tape Pitch 4mm 16 MP3362 – SINGLE-STRING, 3V MINIMUM VIN, 36V BOOST LED DRIVER REVISION HISTORY Revision # 1.0 Revision Date 7/31/2020 1.1 2/22/2023 Description Initial Release Updated “–Z” to “-Z” Updated the Selecting the Inductor section; removed the Compensation Network Setting section Pages Updated 2 13 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. MP3362 Rev. 1.1 2/22/2023 www.MonolithicPower.com MPS Proprietary Information. Patent Protected Unauthorized Photocopy and Duplication Prohibited. © 2023 MPS. All Rights Reserved. 17