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LM3481QMMX Scheda tecnica(PDF) 1 Page - Texas Instruments |
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LM3481QMMX Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 30 page LM3481 VIN ISEN COMP FB AGND UVLO VCC DR PGND FA/SYNC/SD + + VIN = 3.0V to 48V VOUT = 5V, 1A CIN COUT RSEN L1 L2 CBYP RFA CSEN Q1 CS RC CC RF1 RF2 R7 R8 D1 LM3481 www.ti.com SNVS346E – NOVEMBER 2007 – REVISED APRIL 2012 LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching Regulators Check for Samples: LM3481 1 FEATURES KEY SPECIFICATIONS 2 • LM3481QMM in the VSSOP-10 Package are • Wide Supply Voltage Range of 2.97V to 48V Automotive Grade Products that are AEC-Q100 • 100 kHz to 1 MHz Adjustable and Grade 1 Qualified (-40°C to +125°C Operating Synchronizable Clock Frequency Junction Temperature) • ±1.5% (Over Temperature) Internal Reference • 10-Lead VSSOP Package • 10 µA Shutdown Current (Over Temperature) • Internal Push-Pull Driver with 1A Peak Current Capability DESCRIPTION • Current Limit and Thermal Shutdown The LM3481 is a versatile Low-Side N-FET high performance controller for switching regulators. It is • Frequency Compensation Optimized with a suitable for use in topologies requiring a low-side Capacitor and a Resistor FET, such as boost, flyback, SEPIC, etc. The • Internal Softstart LM3481 can be operated at extremely high switching • Current Mode Operation frequencies in order to reduce the overall solution size. The switching frequency of the LM3481 can be • Adjustable Undervoltage Lockout with adjusted to any value between 100 kHz and 1 MHz Hysteresis by using a single external resistor or by synchronizing • Pulse Skipping at Light Loads it to an external clock. Current mode control provides superior bandwidth and transient response in addition APPLICATIONS to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor. • Distributed Power Systems The LM3481 has built in protection features such as • Notebook, PDA, Digital Camera, and other thermal shutdown, short-circuit protection and over Portable Applications voltage protection. Power saving shutdown mode • Offline Power Supplies reduces the total supply current to 5µA and allows • Set-Top Boxes power supply sequencing. Internal soft-start limits the inrush current at start-up. TYPICAL APPLICATION CIRCUIT Figure 1. Typical SEPIC Converter 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 © 2007–2012, 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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