Maker : National Semiconductor
Part No. : LM3310

  Datasheet PDF : LM3310.pdf
  Cross Reference : LM3310 Cross Reference
  Buy Component : LM3310 Find Stock and Price

Shortcut : LM331  LM331  LM3310  LM331A  LM331AN  LM331AN  LM331N  LM331N  LM331N 

Product Information

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 Diagram 20133304 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 is the enable signal for the GPM block. Pulling this pin high enables the GPM while pulling this pin low disables it. VDPM is used for timing sequence control. Reference input for gate pulse modulation (GPM) circuit. The voltage at VDD is used to set the lower VGHM voltage. Op-Amp analog power input. Output of the Op-Amp. Negative input terminal of the Op-Amp. Positive input terminal of the Op-Amp. Analog ground for the step-up regulator, LDO, and Op-Amp. Connect directly to DAP and PGND beneath the device. Not internally connected. Leave pin open. Not internally connected. Leave pin open. www.national.com 2 LM3310 Pin Descriptions Pin 13 14 15 16 17 18 19 20 21 22 23 24 DAP Name NC SS VC FREQ VIN SW SHDN FB PGND CE RE VGH (Continued) Function Not internally connected. Leave pin open. Boost converter soft start pin. Boost compensation network connection. Connected to the output of the voltage error amplifier. Switching frequency select input. Connect this pin to VIN for 1.28MHz operation and AGND for 660kHz operation. Boost converter and GPM power input. Boost power switch input. Switch connected between SW pin and PGND pin. Shutdown pin. Active low, pulling this pin low disable the LM3310. Boost output voltage feedback input. Power Ground. Source connection of the step-up regulator NMOS switch and ground for the GPM circuit. Connect AGND and PGND directly to the DAP beneath the device. Connect capacitor from this pin to AGND. Connect a resistor between RE and PGND. GPM power supply input. VGH range is 5V to 30V. Die Attach Pad. Internally connected to GND. Connect AGND and PGND pins directly to this pad beneath the device. Block Diagrams 20133357 3 www.national.com LM3310 Block Diagrams (Continued) 20133358 20133359 www.national.com 4 ...

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