MP2341GTL-Z

MP2341 High-Efficiency, 2A, 24V, 1MHz, Synchronous, Step-Down LED Driver in SOT583 Package DESCRIPTION FEATURES The MP2341 is a 24V, monolithic, synchronous, rectified, step-down, switch-mode white LED driver with built-in internal power MOSFETs and a synchronous rectifier switch. The MP2341 achieves up to 2A of continuous output current with excellent load and line regulation.   Peak current mode control operation provides fast transient response, easy loop design, and tight output regulation. Fault condition protection includes cycle-bycycle peak current limiting, output short circuit protection, open LED protection, and thermal shutdown. The MP2341 requires a minimal number of readily available, standard external components, and is available in a space-saving SOT583 package.                 Wide 4.2V to 24V Operating Input Range 125mΩ/75mΩ Low-RDS(ON) Internal Power MOSFETs High-Efficiency Synchronous Mode Operation Forced PWM Mode Fast Load Transient Response 1MHz Switching Frequency Internal Soft Start (SS) Analog Dimming by the DC Voltage through the EN/DIM Pin Analog Dimming by the PWM Signal through the PDIM Pin PWM Dimming by the PWM Signal through the EN/DIM Pin 50:1 Dimming Ratio via Analog Dimming 1000:1 Dimming Ratio via PWM Dimming Open LED Protection Over-Current Protection (OCP) and Hiccup Mode Over-Voltage Protection (OVP) with AutoRecovery Thermal Shutdown 100mV Feedback (FB) Voltage Available in a SOT583 Package Optimized Performance with MPS Inductor MPL-AL6060 Series APPLICATIONS     Infrared LED Drivers General LED Drivers Flashlights Handheld Computer Backlighting 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. MP2341 Rev. 1.0 10/29/2020 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 1 MP2341 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS TYPICAL APPLICATION Efficiency vs. VIN VIN C1 22µF BST 2 WLEDs in series, VOUT = 5.9V, L = 6.5μH, ILED = 2A C4 1µF MP2341 100 L1 6.5µH VOUT SW EN/DIM 95 EN/DIM C2 10µF VCC FB C3 100nF PDIM RT 1kΩ GND R1 50mΩ EFFICIENCY (%) VIN 90 85 80 8 10 12 14 16 18 20 22 24 INPUT VOLTAGE (V) MP2341 Rev. 1.0 10/29/2020 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 2 MP2341 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS ORDERING INFORMATION Part Number* MP2341GTL Package SOT583 Top Marking See Below MSL Rating 1 *For Tape & Reel, add suffix –Z (e.g. MP2341GTL-Z). TOP MARKING BCE: Product code of MP2341GTL Y: Year code LLL: Lot number PACKAGE REFERENCE TOP VIEW PDIM 1 8 FB VIN 2 6 VCC 7 SW 3 6 EN/DIM GND 4 5 BST SOT583 MP2341 Rev. 1.0 10/29/2020 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 3 MP2341 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS PIN FUNCTIONS Pin # Name 1 PDIM 2 VIN 3 SW 4 GND 5 BST 6 EN/DIM 7 VCC 8 FB Description PWM signal input. Apply a PWM signal on this pin for brightness control. It is recommended for the dimming frequency to be no lower than 10kHz. Supply voltage. The MP2341 operates on a 4.2V to 24V input rail. A capacitor (C1) is required to decouple the input rail. Connect VIN to the input power supply positive terminal using a wide PCB trace. Switch output. Connect SW to the inductor using a wide PCB trace. System ground. This is the reference ground of the regulated output voltage. It requires extra care during PCB layout. Use copper traces and vias to connect to GND. Bootstrap. Connect a capacitor and a resistor between SW and BST to form a floating supply across the high-side (HS) switch driver. Use a 1µF BST capacitor. On/off control input and dimming command input. Leaving EN/DIM floating or applying a voltage higher than VEN_ON on this pin turns on the chip. For analog dimming, the EN/DIM voltage rises from VADIM_MIN to VADIM_MAX, and the output current changes from the minimum value to the full-scale LED current. To apply PWM dimming, apply 100Hz to 2kHz PWM signal with an amplitude above 1.6V to this pin. Internal bias supply. Decouple with a 0.1µF to 0.22µF capacitor. Select a capacitor that does not exceed 0.22µF. The VCC capacitor should be placed as close as possible to the VCC and GND pins. Current-sense feedback voltage. FB’s internal reference voltage is 0.1V. θJA θJC ABSOLUTE MAX RATINGS (1) Thermal Resistance VIN ............................................... -0.3V to +26V VSW ...................................................................... -0.3V (-6.5V for < +10ns) to +26V (28V for Inductors for more information. MP2341 Rev. 1.0 10/29/2020 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 15 MP2341 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS 3. Keep the switching noise trace as short as possible. 4. Keep the switch node traces, such as the SW node and BST nodes, short and away from the FB network. RT GND B ST C4 R1 E N/DIM SW GND FB V CC V IN C3 LEDSW C2 2. Keep the FB trace as short as possible. If the FB length is too long due to component size, an RT resistor is required. LED- GND P DI M 1. Place the input capacitor as close to VIN and GND as possible. GND C1 PCB Layout Guidelines (8) Efficient PCB layout is critical for stable operation and good EMI performance. For the best results, refer to Figure 5 and follow the guidelines below: L1 VIN SW Top Layer LED+ Bottom Layer Figure 5: Recommended PCB Layout Note: 8) The recommended PCB layout is based on Figure 6. MP2341 Rev. 1.0 10/29/2020 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 16 MP2341 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS TYPICAL APPLICATION CIRCUIT 2 VIN VIN C1 22µF EN/DIM 5 C4 1µF MP2341 6 7 C3 0.1µF BST SW VOUT EN/DIM C2 10µF VCC FB 1 L1 6.5µH 3 PDIM GND 8 RT 1k R1 50mΩ 4 Figure 6: Typical Buck Converter Application, VIN = 8V to 24V, 2 WLEDs in Series, VOUT = 5.9V, ILED = 2A MP2341 Rev. 1.0 10/29/2020 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 17 MP2341 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS PACKAGE INFORMATION SOT583 PIN 1 ID BOTTOM VIEW TOP VIEW SIDE VIEW FRONT VIEW NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 3) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 4) DRAWING IS NOT TO SCALE. RECOMMENDED LAND PATTERN MP2341 Rev. 1.0 10/29/2020 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 18 MP2341 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS CARRIER INFORMATION ABCD Pin1 1 ABCD ABCD ABCD 1 1 1 Feed Direction Part Number Package Description Quantity/Reel MP2341GTL–Z SOT583 5000 MP2341 Rev. 1.0 10/29/2020 Quantity/Tube Quantity/Tray N/A N/A Reel Diameter 7in Carrier Tape Width 8mm www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. Carrier Tape Pitch 4mm 19 MP2341 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS Revision History Revision # 1.0 Revision Date 10/29/2020 Description Initial Release Pages Updated - NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that thirdparty 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. MP2341 Rev. 1.0 10/29/2020 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 20