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LM26 データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM26 データシート(HTML) 1 Page - National Semiconductor (TI) |
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1 / 19 page  LM2612BL 400mA Sub-miniature, Programmable, Step-Down DC-DC Converter for Ultra Low-Voltage Circuits General Description The LM2612 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Lithium-Ion cell. It provides up to 400mA (300mA for B grade), over an input voltage range of 2.8V to 5.5V. Pin programmable out- put voltages of 1.05V, 1.3V, 1.5V or 1.8V allow adjustment for MPU voltage options without board redesign or external feedback resistors. The device has three pin-selectable modes for maximizing battery life in mobile phones and similar portable applica- tions. Low-noise PWM mode offers 600kHz fixed-frequency operation to reduce interference in RF and data acquisition applications during full-power operation. In PWM mode, in- ternal synchronous rectification provides high efficiency (91% typ. at 1.8V OUT). A SYNC input allows synchronizing the switching frequency in a range of 500kHz to 1MHz to avoid noise from intermodulation with system frequencies. Low-current hysteretic PFM mode reduces quiescent current to 160 µA (typ.) during system standby. Shutdown mode turns the device off and reduces battery consumption to 0.02µA (typ.). Additional features include soft start and cur- rent overload protection. The LM2612 is available in a 10 pin micro SMD packge. This package uses National’s wafer level chip-scale micro SMD technology and offers the smallest possible size. Only three small external surface-mount components, an inductor and two ceramic capacitors are required. Key Specifications n Operates from a single LiION cell (2.8V to 5.5V) n Internal synchronous rectification for high PWM mode efficiency n Pin programmable output voltage (1.05V, 1.3V, 1.5V and 1.8V) n 400mA maximum load capability (300mA for B grade) n ± 2% PWM mode DC output voltage precision n 5mV typ PWM mode output voltage ripple n 160 µA typ PFM mode quiescent current n 0.02µA typ shutdown mode current n 600kHz PWM mode switching frequency n SYNC input for PWM mode frequency synchronization from 500kHz to 1MHz Features n Sub-miniature 10-pin micro SMD package n Only three tiny surface-mount external components required n Uses small ceramic capacitors n Internal soft start n Current overload protection n No external compensation required n Thermal shutdown protection Applications n Mobile Phones n Hand-Held Radios n Battery Powered Devices Typical Application Circuit 20041802 December 2002 © 2002 National Semiconductor Corporation DS200418 www.national.com |
同様の部品番号 - LM26 |
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同様の説明 - LM26 |
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