MP2338GTL-Z

MP2338 High-Efficiency, 28V, 3A, 450kHz, Synchronous Step-Down Converter In SOT583 Package DESCRIPTION FEATURES The MP2338 is a fully integrated, highfrequency, synchronous, rectified, step-down switch-mode converter with internal power MOSFETs. It offers a very compact solution to achieve 3A of continuous output current across a wide input range, with excellent load and line regulation. The MP2338 has synchronous mode operation for high efficiency across the wide output current load range.              Constant-on-time (COT) control provides very fast transient response and easy loop design, as well as tight output regulation. Full protection features include short-circuit protection (SCP), over-current protection (OCP), under-voltage protection (UVP), and thermal shutdown.   The MP2338 requires a minimal number of readily available, standard external components. It is available in a space-saving SOT583 package. Wide 4.5V to 28V Operating Input Range Wide 0.5V to 16V VOUT ±1.5% Internal Reference Accuracy OverTemperature 115mΩ/55mΩ Low RDS(ON) Internal Power MOSFETs 160µA Quiescent Current >90% Efficiency for 24V to 5V/3A Condition Power Save Mode at Light Load Fast Load Transient Response 450kHz Switching Frequency tON Extension to Improve Dropout Configurable Soft-Start Time Power Good Indication Over-Current Protection (OCP) with Hiccup Mode Thermal Shutdown Protection Available in an SOT583 Package Optimized Performance with MPS Inductor MPL-AL Series APPLICATIONS      Game Consoles Multi-Function Printers Power Meters Flat Panel Televisions and Monitors General-Purpose Power Supplies 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. TYPICAL APPLICATION Efficiency VOUT = 5V, L = 6.8µH, DCR = 16mΩ BST VIN C1 22μF On/Off C3 0.1μF L1 6.8μH 100 5V/3A SW EN SS C4 22nF C2 R6 22μF x 2 10kΩ MP2338 FB PG GND R1 90.9kΩ R2 10kΩ VOUT 90 EFFICIENCY(%) VIN 6.5V to 28V 80 70 60 Vin=19V Vin=24V 50 40 0.001 MP2338 Rev. 1.0 12/11/2020 Vin=12V 0.01 0.1 1 LOAD CURRENT(A) www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 10 1 MP2338 – 28V, 3A, SYNCHRONOUS STEP-DOWN CONVERTER W/ INTERNAL MOSFETS ORDERING INFORMATION Part Number* MP2338GTL Package SOT583 Top Marking See Below MSL Rating 1 * For Tape & Reel, add suffix –Z (e.g. MP2338GTL–Z). TOP MARKING BLP: Product code of MP2338GTL Y: Year code LLL: Lot number PACKAGE REFERENCE TOP VIEW SOT583 MP2338 Rev. 1.0 12/11/2020 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 2 MP2338 – 28V, 3A, SYNCHRONOUS STEP-DOWN CONVERTER W/ INTERNAL MOSFETS PIN FUNCTIONS Pin # 1 Name Description Power good output. This pin is an open-drain output. PG pulls low when the IC is disabled. PG can be pulled up to another DC source. Note that if PG is pulled up to an external voltage, PG PG does not de-assert (logic low) if the input power is off. It is recommended to pull PG up to VOUT so that PG can de-assert when the input power is off. 2 VIN 3 SW 4 GND 5 BST 6 EN 7 SS 8 FB MP2338 Rev. 1.0 12/11/2020 Supply voltage. The MP2338 operates from a 4.5V to 28V input rail. Place a ceramic capacitor on VIN to decouple the input rail. Connect VIN using a wide PCB trace. Switch output. Connect SW using a wide PCB trace. System ground. Reference ground of the regulated output voltage. GND requires additional considerations when designing the PCB layout. Connect GND with copper traces and vias. Bootstrap. Connect a capacitor between the SW and BST pins to form a floating supply across the high-side switch driver. Generally, use a 0.1µF bootstrap capacitor. Enable pin. EN is a digital input that turns the buck converter on or off. When the power supply of the control circuit is ready, drive EN high to turn the buck converter on. Drive EN low to turn the converter off. Connect EN to VIN through a resistive voltage divider for automatic start-up. The EN voltage should not exceed 6V. Soft start. Connect an external capacitor to SS to configure the soft-start time for the switchmode converter. Feedback. Connect FB to the tap of an external resistor divider from the output to GND to set the output voltage. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2020 MPS. All Rights Reserved. 3 MP2338 – 28V, 3A, SYNCHRONOUS STEP-DOWN CONVERTER W/ INTERNAL MOSFETS ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN ................................................. -0.3V to +30V VSW ....................................................................... -0.3V (-5V for