LM3224

www.DataSheet4U.com LM3224 615kHz/1.25MHz Step-up PWM DC/DC Converter December 2004 LM3224 615kHz/1.25MHz Step-up PWM DC/DC Converter General Description The LM3224 is a step-up DC/DC converter with a 0.15Ω (typ.), 2.45A (typ.) internal switch and pin selectable operating frequency. With the ability to convert 3.3V to multiple outputs of 8V, -8V, and 23V, the LM3224 is an ideal part for biasing TFT displays. With the high current switch it is also ideal for driving high current white LEDs for flash applications. The LM3224 can be operated at switching frequencies of 615kHz and 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. An external soft-start pin allows the user to control the amount of inrush current during start up. The LM3224 is available in a low profile 8-lead MSOP package. Features n n n n n Operating voltage range of 2.7V to 7V 615kHz/1.25MHz pin selectable frequency operation Over temperature protection Optional soft-start function 8-Lead MSOP package Applications n n n n n n TFT Bias Supplies Handheld Devices Portable Applications GSM/CDMA Phones Digital Cameras White LED Flash/Torch Applications Typical Application Circuit www.DataSheet4U.com 20097631 © 2004 National Semiconductor Corporation DS200976 www.national.com www.DataSheet4U www.DataSheet4U.com 4U.com www.DataSheet4U.c...