LM3310

LM3310 Step-up PWM DC/DC Converter with Integrated Op-Amp and Gate Pulse Modulation Switch August 2005 LM3310 Step-up PWM DC/DC Converter with Integrated Op-Amp and Gate Pulse Modulation Switch General Description The LM3310 is a step-up DC/DC converter integrated with an Operational Amplifier and a gate pulse modulation switch. The boost (step-up) converter is used to generate an adjustable output voltage and features a low RDSON internal switch for maximum efficiency. The operating frequency 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 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 LM3310 is available in a low profile 24-lead LLP package. Features n n n n n n n n n n Boost converter with a 2A, 0.18Ω switch Boost output voltage adjustable up to 20V Operating voltage range of 2.5V to 7V 660kHz/1.28MHz pin selectable switching frequency Adjustable soft-start function Input undervoltage protection Over temperature protection Integrated Op-Amp Integrated gate pulse modulation (GPM) switch 24-Lead LLP package Applications n TFT Bias Supplies n Portable Applications Typical Application Circuit 20133331 © 2005 National Semiconductor Corporation DS201333 www.national.com LM3310 Connection Diagra...