ELM621LA

ELM621LA High efficiency 30V step up DC/DC converter ■General description ELM621LA is a high efficiency step-up DC/DC converter using a constant frequency, current mode architecture. Featuring current-mode and fixed frequency operation, this device incorporates an integrated main switch and the switching frequency is internally set at 1.3MHz, allowing the use of small surface mount inductors and capacitor. As for the output voltage, it can be regulated ranging from 2.7V to 30V. ELM621LA is available in a low profile TSOT-25 package. ■Features Current mode operation Thermal shutdown protection Undervoltage-lockout (UVLO) Input voltage range Internal current limit Shutdown current Constant frequency operation High efficiency Package : 2.5V to 5.5V : 1.45A : < 0.1µA : Typ.1.3MHz : 90% : TSOT-25 ■Application Cellular telephones PDAs and smart phones MP3 players Wireless and DSL card Digital still cameras Slim-type DVD Portable instruments ■Maximum absolute ratings Parameter Symbol Limit VIN power supply voltage Vin GND-0.3 to +6.5 Apply voltage to EN Ven GND-0.3 to +6.5 Apply voltage to FB Vfb GND-0.3 to +6.5 Apply voltage to SW Vsw GND-0.3 to +43 SW peak current Isw 2 Power dissipation Pd 200 Operating temperature range Top -20 to +85 Storage temperature range Tstg -65 to +150 Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used. Unit V V V V A mW °C °C ■Selection guide ELM621...