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LM3671MF-1.8 データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM3671MF-1.8 データシート(HTML) 1 Page - National Semiconductor (TI) |
1 / 16 page LM3671 2MHz , 600mA Step-Down DC-DC Converter in SOT23-5 General Description The LM3671 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 600mA load current, over an input voltage range from 2.8V to 5.5V. There are several different fixed voltage output options available as well as an adjustable output voltage version. The device offers superior features and performance for mobile phones and similar portable applications with com- plex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During full-power op- eration, a fixed-frequency 2 MHz (typ). PWM mode drives loads from ∼70 mA to 600 mA max. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 16 µA (typ) at light loads and system standby. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled low) the device turns off and reduces battery consumption to 0.01 µA (typ). The LM3671 is available in a SOT23-5 package with Pb and No Pb (Lead free) versions. A high switching frequency - 2 MHz (typ) - allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required. Features n 16 µA typical quiescent current n 600 mA maximum load capability n 2 MHz PWM fixed switching frequency (typ) n Automatic PFM/PWM mode switching n Available in fixed output voltages and adjustable version n SOT23-5 package n Internal synchronous rectification for high efficiency n Internal soft start n 0.01 µA typical shutdown current n Operates from a single Li-Ion cell or 3 cell NiMH/NiCd batteries n Only three tiny surface-mount external components required (one inductor, two ceramic capacitors) n Current overload and Thermal shutdown protection Applications n Mobile phones n PDAs n MP3 players n W-LAN n Portable instruments n Digital still cameras n Portable Hard disk drives Typical Application Circuits 20108401 FIGURE 1. Typical Application Circuit November 2004 © 2004 National Semiconductor Corporation DS201084 www.national.com |
同様の部品番号 - LM3671MF-1.8 |
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同様の説明 - LM3671MF-1.8 |
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