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LM3477MM датащи(PDF) 1 Page - Texas Instruments |
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LM3477MM датащи(HTML) 1 Page - Texas Instruments |
1 / 35 page LM3477 www.ti.com SNVS141K – OCTOBER 2000 – REVISED MARCH 2013 LM3477 High Efficiency High-Side N-Channel Controller for Switching Regulator Check for Samples: LM3477 1 FEATURES DESCRIPTION The LM3477/A is a high-side N-channel MOSFET 2 • 500kHz Switching Frequency switching regulator controller. It can be used in • Adjustable Current Limit topologies requiring a high side MOSFET such as • 1.5% Reference buck, inverting (buck-boost) and zeta regulators. The LM3477/A's internal push pull driver allows • Thermal Shutdown compatibility with a wide range of MOSFETs. This, • Frequency Compensation Optimized with a the wide input voltage range, use of discrete power Single Capacitor and Resistor components and adjustable current limit allows the • Internal Softstart LM3477/A to be optimized for a wide variety of applications. • Current Mode Operation • Undervoltage Lockout with Hysteresis The LM3477/A uses a high switching frequency of 500kHz to reduce the overall solution size. Current- • 8-lead (VSSOP-8) Package mode control requires only a single resistor and capacitor for frequency compensation. The current APPLICATIONS mode architecture also yields superior line and load • Local Voltage Regulation regulation and cycle-by-cycle current limiting. A 5µA shutdown state can be used for power savings and • Distributed Power for power supply sequencing. Other features include • Notebook and Palmtop Computers internal soft-start and output over voltage protection. • Internet Appliances The internal soft-start reduces inrush current. Over voltage protection is a safety feature to ensure that • Printers and Office Automation the output voltage stays within regulation. • Battery operated Devices The LM3477A is similar to the LM3477. The primary • Cable Modems difference between the two is the point at which the • Battery Chargers device transitions into hysteretic mode. The hysteretic threshold of the LM3477A is one-third of the LM3477. Hysteretic Threshold(1) LM3477 ≊ 36% of programmed current limit LM3477A ≊ 12% of programmed current limit (1) See Hysteretic Threshold and PROGRAMMING THE CURRENT LIMIT/HYSTERETIC THRESHOLD for more information. 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 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2000–2013, 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. |
Аналогичный номер детали - LM3477MM |
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Аналогичное описание - LM3477MM |
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