LM2622 Datasheet | National Semiconductor

Description The LM2622 is a step-up DC/DC converter with a 1.6A, 0.2Ω internal switch and pin selectable operating frequency. With the ability to convert 3.3V to multiple outputs of 8V, -8V, and 23V, the LM2622 is an ideal part for biasing TFT displays. The LM2622 can be operated at switching frequencies of 600k Hz and 1.3MHz allowing for easy filtering and low noise. An external pensation pin gives the user flexibility in setting frequency pensation, which makes possible the use of small, low ESR ceramic capacitors at the output. The LM2622 is available in a low profile 8-lead MSOP package. n 600k Hz/1.3MHz pin selectable frequency operation n Over temperature protection n 8-Lead MSOP package Applications n n n n n TFT Bias Supplies Handheld Devices Portable Applications GSM/CDMA Phones Digital Cameras Features n 1.6A, 0.2Ω, internal switch n Operating voltage as low as 2.0V Typical Application Circuit 600 k Hz Operation © 2001 National Semiconductor Corporation DS101273 .national. Connection Diagram Top View 8-Lead Plastic MSOP NS Package Number MUA08A Ordering Information Order Number LM2622MM-ADJ LM2622MMX-ADJ Package Type MSOP-8 MSOP-8 NSC Package Drawing MUA08A MUA08A Supplied As 1000 Units, Tape and Reel 3500 Units, Tape and Reel S18B S18B Package ID Pin Description Pin 1 2 3 4 5 6 7 8 Name VC FB SHDN GND SW VIN FSLCT NC Output voltage feedback input. Shutdown control input, active low. Analog and power ground. Power switch input. Switch connected between SW pin and GND pin. Analog power input. Switching frequency select input. VIN = 1.3MHz. Ground = 600k Hz. Connect to ground. Function pensation network connection. Connected to the output of the voltage error amplifier. .national. Block Diagram .national. Absolute Maximum Ratings (Note 1) Vapor Phase (60 sec.) Infrared (15 sec.) ESD Susceptibility (Note 3) Human Body Model Machine Model 215˚C 220˚C If Military/Aerospace specified...