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LM3311 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM3311 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 29 page  LM3311 Step-Up PWM DC/DC Converter with Integrated LDO, Op-Amp, and Gate Pulse Modulation Switch General Description The LM3311 is a step-up DC/DC converter integrated with an LDO, an Operational Amplifier, and a gate pulse modu- lation switch. The boost (step-up) converter is used to gen- erate an adjustable output voltage and features a low R DSON internal switch for maximum efficiency. The operating fre- quency is selectable between 660kHz and 1.28MHz allowing for the use of small external components. An external soft- start pin enables the user to tailor the soft-start time to a specific application and limit the inrush current. The LDO also has an adjustable output voltage and is stable using ceramic output capacitors. The Op-Amp is capable of sourcing/sinking 135mA of current (typical). The gate pulse modulation switch can operate with a VGH voltage of 5V to 30V. The LM3311 is available in a low profile 24-lead LLP package. Features n Boost converter with a 2A, 0.18 Ω switch n Boost output voltage adjustable up to 20V n Operating voltage range of 2.5V to 7V n 660kHz/1.28MHz pin selectable switching frequency n Adjustable soft-start function n Input undervoltage protection n Over temperature protection n Adjustable low dropout linear regulator (LDO) n Integrated Op-Amp n Integrated gate pulse modulation (GPM) switch n 24-Lead LLP package Applications n TFT Bias Supplies n Portable Applications Typical Application Circuit 20126331 September 2005 © 2005 National Semiconductor Corporation DS201263 www.national.com |
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