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LM3661 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3661 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 17 page  LM3661 450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits General Description The LM3661 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Lithium-Ion cell. The device provides two pin-selectable output voltages. See ordering information for a list of voltage options avail- able . This allows adjustment for DSP or CPU voltage op- tions, as well as dynamic output voltage switching for re- duced power consumption. Internal synchronous rectification provides high efficiency (92% typ. at 1.35V OUT). The LM3661 offers superior features and performance for mobile phones and similar portable applications. Pin- selectable PWM and Linear modes provide improved system control for maximizing battery life. During full-load, fixed frequency PWM operation reduces interference in RF and data acquisition applications by minimizing noise harmonics at sensitive IF and sampling frequencies. The SYNC/MODE input allows synchronization of the switching frequency in a range of below 500 kHz to 750 kHz to prevent noise from intermodulation with system frequencies. Linear operation reduces quiescent current to 29 µA (typ.) during system standby for extended battery life, while supplying up to 15 mA. Shutdown turns the device off and reduces battery consumption to 0.5 µA (typ.). This device offers a selectable over Current Limit to protect a variety of inductors. The LM3661 is available in a 10 pin micro SMD package. This packaging uses National’s chip-scale micro SMD tech- nology and offers the smallest possible size. A high (600 kHz) switching frequency allows use of tiny surface-mount components; only three are required — an inductor and two ceramic capacitors. Features n Operates from a single Li-ION cell n Pin selectable output voltages n Pin selectable Inductor Current Limit n ± 3% output voltage precision in PWM mode n Miniature 10-pin micro SMD package n Only three tiny surface-mount external components required n Uses small ceramic capacitors n 8 mV typ. PWM output voltage ripple n Internal synchronous rectification for high efficiency (92% at 2.7 V IN, 1.35 VOUT) n 29 µA typ. quiescent current (Linear mode) n 0.5 µA typ. shutdown current n SYNC/MODE input for frequency synchronization from 500 kHz to 750 kHz n Current and Thermal overload protection n High gain control loop with internal compensation n Up to 450mA I OUT capability for LM3661-1.35/1.4 n Up to TBDmA I OUT capability for LM3661-1.25 Applications n Mobile phones n Hand-Held radios n Personal Digital Assistants n Palm-top PC’s and Pocket PC’s n Portable Instruments n Battery Powered Device Typical Application Circuit 20098802 May 2005 © 2005 National Semiconductor Corporation DS200988 www.national.com |
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