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LM2854 데이터시트(PDF) 1 Page - Texas Instruments |
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LM2854 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 30 page PVIN AVIN EN AGND PGND FB SW LM2854 VIN VOUT SS CIN LO CO RFB1 RCOMP CCOMP RFB2 CSS LM2854 www.ti.com SNVS560B – MARCH 2008 – REVISED NOVEMBER 2008 LM2854 4A 500 kHz / 1 MHz Synchronous SIMPLE SWITCHER® Buck Regulator Check for Samples: LM2854 1 FEATURES • Broadband Networking and Communications Infrastructure 234 • Input Voltage Range of 2.95V to 5.5V • Portable Computing • Maximum Load Current of 4A • Wide Bandwidth Voltage Mode Control Loop, DESCRIPTION Partial Internal Compensation The LM2854 PowerWise™ SIMPLE SWITCHER • Fixed Switching Frequency of 500 kHz or 1 buck regulator is a 500 kHz or 1 MHz step-down MHz switching voltage regulator capable of driving up to a 4A load with exceptional power conversion efficiency, • 35 m Ω Integrated MOSFET Switches line and load regulation, and output accuracy. The • Adjustable Output Voltage Down to 0.8V LM2854 can accept an input voltage rail between • Optimized Reference Voltage Initial Accuracy 2.95V and 5.5V and deliver an adjustable and highly and Temperature Drift accurate output voltage as low as 0.8V. Externally established soft-start with a small capacitor facilitates • External Soft-Start Control with Tracking controlled start-up, and the LM2854 is capable of Capability starting gracefully into a pre-biased output voltage. • Enable Pin with Hysteresis Partial internal compensation reduces the number of • Low Standby Current of 230 µA external passive components and PC board space typically necessary in a voltage mode buck converter • Pre-Biased Load Startup Capability application, yet preserving flexibility to deal with • Integrated UVLO, OCP and Thermal Shutdown ceramic and/or electrolytic based load capacitors. • 100% Duty Cycle Capability Lossless cycle-by-cycle peak current limit is used to protect the load from an overcurrent or short-circuit • HTSSOP-16 Exposed Pad Package fault, and an enable comparator simplifies sequencing applications. The LM2854 is available in APPLICATIONS an exposed pad HTSSOP-16 package that enhances • Low Voltage POL Regulation from 5V or 3.3V the thermal performance of the regulator. Rail • Local Solution for FPGA/DSP/ASIC/µP Core or I/O Power Typical Application Circuit 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 SIMPLE SWITCHER is a registered trademark of Texas Instruments, Inc. 3 PowerWise is a trademark of Texas Instrumetns, Inc. 4 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2008, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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