ELM621LA
High efficiency 30V step up DC/DC converter

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.

Current mode control
Thermal shutdown protection
Undervoltage-lockout (UVLO)
Input voltage range2.5V to 5.5V
Internal current limit1.45A
Shutdown current<0.1µA
Constant frequency operationTyp.1.3MHz
High efficiency90%
PackageTSOT-25
DatasheetELM621LA
Application
Cellular telephones
PDAs and smart phones
MP3 player
Wireless and DSL card
Digital still cameras
Slim-type DVD
Portable instruments

Absolute Maximum Ratings

ParameterSymbolLimitUnit
VIN power supply voltageVinGND-0.3 to +6.5V
Apply voltage to ENVenGND-0.3 to Vin+0.3V
Apply voltage to FBVfbGND-0.3 to Vin+0.3V
Apply voltage to SWVswGND-0.3 to +43V
SW peak currentIsw2A
Power dissipationPd200mW
Operating temperature rangeTop-20 to +85°C
Storage temperature rangeTstg-65 to +150°C

Block diagram

block-diagram