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LM3211 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3211 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 21 page  LM3211 Step-up PWM DC/DC Converter Integrated with 4 Buffers General Description The LM3211 is a compact bias solution for TFT displays. It has a current mode PWM step-up DC/DC converter with a 1.4A, 0.17 Ω internal switch. Capable of generating 8V at 300mA from a Lithium Ion battery, the LM3211 is ideal for generating bias voltages for large screen LCD panels. The LM3211 can be operated at switching frequencies of 600kHz or 1.25MHz, allowing for easy filtering and low noise. An external compensation pin gives the user flexibility in setting frequency compensation, which makes possible the use of small, low ESR ceramic capacitors at the output. The LM3211 uses a patented internal circuitry to limit startup inrush current of the boost switching regulator without the use of an external softstart capacitor. An external softstart pin enables the user to tailor the softstart to a specific application. The LM3211 contains 4 Gamma buffers capable of supplying 35mA source and sink. The TSSOP-20 package ensures a low profile overall solution. Features n 1.4A, 0.17 Ω, internal power switch n V IN operating range: 2.2V to 7.5V n 600kHz/1.25MHz selectable frequency step-up DC/DC converter n 20 pin TSSOP package n Inrush current limiting circuitry n External softstart override n 4 Gamma buffers Applications n LCD Bias Supplies n Handheld Devices n Portable Applications n Cellular Phones/Digital Cameras Typical Application Circuit 20062231 February 2004 © 2004 National Semiconductor Corporation DS200622 www.national.com |
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