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LM3370 датащи(PDF) 1 Page - Texas Instruments |
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LM3370 датащи(HTML) 1 Page - Texas Instruments |
1 / 33 page LM3370 www.ti.com SNVS406M – NOVEMBER 2005 – REVISED AUGUST 2011 LM3370 Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function Check for Samples: LM3370 1 FEATURES 2 • I2C-compatible interface • 2.7V ≤ VIN ≤ 5.5V – VOUT1 = 1V to 2V in 50 mV steps • Operates from a single Li-Ion cell or 3 cell NiMH/NiCd batteries and 3.3V/5.5V fixed rails – VOUT2 = 1.8V to 3.3V in 100 mV steps • 2.2 µH Inductor, 4.7 µF Input and 10 µF Output – Automatic PFM/PWM mode switching & Capacitor per channel Forced PWM mode for low noise operation • 16-lead LLP Package (4 mm x 5 mm x 0.8 mm) – Spread Spectrum capability using I2C • 20-bump micro SMD Package (3.0 mm x 2.0 • 600 mA load per channel mm x 0.6 mm) • 2 MHz PWM fixed switching frequency (typ.) • The Bucks operate 180° out-of-phase timing APPLICATIONS offset for noise and input surge current • Baseband Processors abatement • Application Processors (Video, Audio) • Internal synchronous rectification for high • I/O Power efficiency • FPGA Power and CPLD • Internal soft start • Power-on-reset function for both outputs DESCRIPTION The LM3370 is a dual step-down DC-DC converter optimized for powering 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 600 mA load per channel. The output voltage range varies from 1V to 3.3V and can be dynamically controlled using the I2C-compatible interface. This dynamic voltage scaling function allows processors to achieve maximum performance at the lowest power level. The I2C-compatible 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 requirements. 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 further external devices. 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 4 mm by 5 mm 16-lead non-pullback LLP and a 20-bump micro SMD, 3.0 mm x 2.0 mm x 0.6 mm, package. A high switching frequency—2 MHz (typ)—allows use of tiny surface-mount components including a 2.2 µH inductor. Default fixed voltages for the 2 output voltages combination can be customized to fit system requirements by contacting National Semiconductor Corporation. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2005–2011, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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Аналогичное описание - LM3370 |
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