LM3310 Datasheet | National Semiconductor

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 660k Hz and 1.28MHz allowing for the use of small external ponents. 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 135m A 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 660k Hz/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 © 2005 National Semiconductor Corporation DS201333 .national. Connection Diagram LLP-24 (Top View) θJA=37˚C/W Ordering Information Order Number LM3310SQ LM3310SQX LM3310SQ LM3310SQX NOPB NOPB Spec. Package Type LLP-24 LLP-24 LLP-24 LLP-24 NSC Package Drawing SQA24A SQA24A SQA24A SQA24A Supplied As 1000 units/reel tape and reel 4500 units/reel tape and reel 1000 units/reel tape and reel 4500 units/reel tape and reel Pin Descriptions Pin 1 2 3 4 5 6 7 8 9 10 11 12 Name NC VGHM VFLK VDPM VDD AVIN OUT NEG POS AGND NC NC Function Not internally connected. Leave pin open. Output of GPM circuit. This output directly drives the supply for the gate driver circuits. Determines when the TFT LCD is on or off. This is controlled by the timing controller in the LCD module. VDPM pin...