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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LM3670MFX-1.875 Datenblatt(PDF) 1 Page - National Semiconductor (TI) |
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LM3670MFX-1.875 Datenblatt(HTML) 1 Page - National Semiconductor (TI) |
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1 / 17 page  LM3670 Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits General Description The LM3670 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 350 mA load current, over an input voltage range from 2.5V to 5.5V. There are several different fixed voltage output options available as well as an adjustable output voltage version (see ordering information). 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 1 MHz (typ). PWM mode drives loads from ∼70 mA to 350 mA max, with up to 95% efficiency. Hysteretic PFM mode extends the battery life through reduc- tion of the quiescent current to 15 µA (typ) during light current loads and system standby. Internal synchronous rec- tification provides high efficiency (90 to 95% typ. at loads between 1 mA and 100 mA). In shutdown mode (Enable pin pulled low) the device turns off and reduces battery con- sumption to 0.1 µA (typ.). The LM3670 is available in a SOT23-5 package. A high switching frequency - 1 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 V OUT = Adj (0.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V n 2.5V ≤ V IN ≤ 5.5V n 15 µA typical quiescent current n 350 mA maximum load capability n 1 MHz PWM fixed switching frequency (typ.) n Automatic PFM/PWM mode switching n Available in fixed output voltages as well as an adjustable version n SOT23-5 package n Low drop out operation - 100% duty cycle mode n Internal synchronous rectification for high efficiency n Internal soft start n 0.1 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 protection Applications n Mobile phones n HandHeld n PDAs n Palm-top PCs n Portable Instruments n Battery Powered Devices Typical Application 20075801 FIGURE 1. Fixed Output Voltage - Typical Application Circuit January 2006 © 2006 National Semiconductor Corporation DS200758 www.national.com |
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Ähnliche Beschreibung - LM3670MFX-1.875 |
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