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LM2608ATLX-1.3 Datenblatt(PDF) 1 Page - National Semiconductor (TI) |
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LM2608ATLX-1.3 Datenblatt(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page LM2608 400mA Sub-miniature, High Efficiency, Programmable DC-DC Converter with Linear Mode General Description The LM2608 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Lithium-Ion cell. It provides up to 400mA over an input voltage range of 2.8V to 5.5V. Operating from a 1.35V reference, this device provides pin-selectable output voltages of 1.3V/1.5V (300mA) for low voltage version or 1.5V/1.8V (400mA) for high voltage version. This allows adjustment for DSP or CPU voltage options, as well as dynamic output voltage switching for reduced power consumption. Internal synchronous recti- fication provides high efficiency. The LM2608 offers superior features and performance for mobile phones and similar portable applications with com- plex power management systems. Pin-selectable PWM low- noise and linear micropower modes offer improved system control for maximizing battery life. During full power opera- tion, fixed-frequency PWM mode reduces interference in RF and data acquisition applications by minimizing noise har- monics at sensitive IF and sampling frequencies. A SYNC input allows synchronizing the switching frequency in a range of 500kHz to 1MHz to avoid noise from intermodula- tion with system frequencies. Linear operation reduces qui- escent current to 20µA (typ) during system standby for ex- tended battery life. It provides up to 3 mA in the linear mode. Shutdown reduces battery consumption to 0.02µA (typ.). The LM2608 is available in a 10 pin Micro SMD package. This package uses National’s wafer level chip-scale Micro SMD technology and offers the smallest possible size. A high switching frequency (600KHz) allows use of tiny surface- mount components. Only four small external surface-mount components, an inductor and three ceramic capacitors are required. Pin selectable output voltage eliminates the need for bulky external feedback resistors. Key Specifications n Operates from a single LiION cell (2.8V to 5.5V) n Pin selectable output voltage (1.5V/1.8V or 1.3V/1.5V versions), without external feedback resistors n 400mA maximum load capability n ± 1% PWM mode DC output voltage precision (Excluding external reference tolerance) n 5mV typ PWM mode output voltage ripple n 20 µA typ quiescent current (Linear Mode) n 0.02µA typ shutdown mode current n Internal synchronous rectification for high efficiency (91% at 2.8V IN, 1.8VOUT) n 600kHz PWM mode switching frequency n SYNC input for PWM mode frequency synchronization from 500kHz to 1MHz n 15% accuracy for F OSC and Ilim Features n Sub-miniature 10-pin thin Micro SMD package n Only four tiny surface-mount external components required n Uses small ceramic capacitors n Internal soft start n Current and Thermal shutdown protection n No external compensation required Applications n Mobile Phones n Hand-Held Radios n Battery Powered Devices Typical Application Circuit 20036602 December 2002 © 2003 National Semiconductor Corporation DS200366 www.national.com |
Ähnliche Teilenummer - LM2608ATLX-1.3 |
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Ähnliche Beschreibung - LM2608ATLX-1.3 |
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