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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM3370 датащи(PDF) 1 Page - National Semiconductor (TI) |
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LM3370 датащи(HTML) 1 Page - National Semiconductor (TI) |
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1 / 23 page  LM3370 Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function General Description LM3370 is a dual step-down DC-DC converter optimized for powering an ultra-low voltage circuits from a single Li-Ion battery and input rail ranging from 2.7V to 5.5V. It provides two outputs with 600mA load per channel. The output volt- age range varies from 1V to 3.3V and can be dynamically controlled using the I 2C compatible interface. This dynamic voltage scaling function allows processors to achieve maxi- mum performance at the lowest power level. The I 2C com- patible interface can also be used to control auto PFM-PWM/ PWM mode selection and other performance enhancing features. The LM3370 offers superior features and performance for portable systems with complex power management require- ments. Automatic intelligent switching between PWM low- noise and PFM low-current mode offers improved system efficiency. Internal synchronous rectification enhances the converter efficiency without the use of futher external device. There is a power-on-reset function that monitors the level of the output voltage to avoid unexpected power losses. The independent enable pin for each output allows for simple and effective power sequencing. LM3370 is available in a 4mm by 5mm 16-lead non-pullback LLP package. A high switching frequency — 2MHz (typ) — allows use of tiny surface-mount components includ- ing a 2.2µH inductor. Default fixed voltages for the 2 voltage outputs can be customized to fit system requirements by contacting National Semiconductor Corporation. Features n I 2C compatible interface —V OUT1 = 1V to 2V in 50mV steps —V OUT2 = 2.3V to 3.3V in 100mV steps — Automatic PFM/PWM mode switching & Forced PWM mode for low noise operation — Spread Spectrum capability using I 2C n 600mA load per channel n 2MHz PWM fixed switching frequency (typ.) n Internal synchronous rectification for high efficiency n Internal soft start n Power-on-reset function for both outputs n 2.7V ≤ V IN ≤ 5.5V n Operates from a single Li-Ion cell or 3 cell NiMH/NiCd batteries and 3.3V/5.5V fixed rails n 2.2µH Inductor, 4.7µF Input and 10µF Output Capacitor per channel n 16-lead LLP Package (4mm x 5mm x 0.8mm) Applications n Baseband Processors n Application Processors (Video, Audio) n I/O Power n FPGA Power and CPLD PRELIMINARY December 2005 © 2005 National Semiconductor Corporation DS201673 www.national.com |
Аналогичный номер детали - LM3370 |
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Аналогичное описание - LM3370 |
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