Part # LM2612BL datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2612BL 400mA Sub-miniature, Programmable, Step-Down DC-DC Converter for Ultra Low-Voltage Circuits


Part Details:

Low-V LM2612BL December 2002 oltage LM2612BL 400mA 400mA Sub-miniature, Programmable, Step-Down DC-DC Circuits Converter for Ultra Low-Voltage CircuitsGeneral Description Key Specifications Sub-miniature, The LM2612 step-down DC-DC converter is optimized for n Operates from a single LiION cell (2.8V to 5.5V) powering ultra-low voltage circuits from a single Lithium-Ion n Internal synchronous rectification for high PWM mode cell. It provides up to 400mA (300mA for B grade), over an efficiency input voltage range of 2.8V to 5.5V. Pin programmable out- n Pin programmable output voltage (1.05V, 1.3V, 1.5V and put voltages of 1.05V, 1.3V, 1.5V or 1.8V allow adjustment 1.8V) for MPU voltage options without board redesign or external n 400mA maximum load capability (300mA for B grade) feedback resistors. n ±2% PWM mode DC output voltage precision The device has three pin-selectable modes for maximizing n 5mV typ PWM mode output voltage ripple battery life in mobile phones and similar portable applica- n 160 µA typ PFM mode quiescent current tions. Low-noise PWM mode offers 600kHz fixed-frequency Programmable, n 0.02µA typ shutdown mode current operation to reduce interference in RF and data acquisitionapplications during full-power operation. In PWM mode, in- n 600kHz PWM mode switching frequency ternal synchronous rectification provides high efficiency n SYNC input for PWM mode frequency synchronization (91% typ. at 1.8V ). A SYNC input allows synchronizing from 500kHz to 1MHz OUT the switching frequency in a range of 500kHz to 1MHz toavoid noise from intermodulation with system frequencies. Features Low-current hysteretic PFM mode reduces quiescent current n Sub-miniature 10-pin micro SMD package to 160 µA (typ.) during system standby. Shutdown mode n Only three tiny surface-mount external components turns the device off and reduces battery consumption to required 0.02µA (typ.). Additional features include soft start and cur- n Uses small ceramic capacitors rent overload protection. Step-Down n Internal soft start The LM2612 is available in a 10 pin micro SMD packge. This n Current overload protection


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LM2612BL.pdf Datasheet