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LM3677 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3677 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 30 page LM3677 www.ti.com SNVS502E – MARCH 2007 – REVISED OCTOBER 2008 LM3677 3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits Check for Samples: LM3677 1 FEATURES APPLICATIONS 2 • 16 µA typical quiescent current • Mobile Phones • 600 mA maximum load capability • PDAs • 3 MHz PWM fixed switching frequency (typ.) • MP3 Players • Automatic PFM/PWM mode switching • W-LAN • Available in 5-bump micro SMD package and • Portable Instruments 6-pin LLP package • Digital Still Cameras • Internal synchronous rectification for high • Portable Hard Disk Drives efficiency • Internal soft start • 0.01 µA typical shutdown current • Operates from a single Li-Ion cell battery • Only three tiny surface-mount external components required (solution size less than 20 mm2) • Current overload and thermal shutdown protection DESCRIPTION The LM3677 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600 mA load current over the entire input voltage range. The LM3677 is configured to different fixed voltage output options as well as an adjustable output voltage version range from 1.2V to 3.3V. The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low- current mode offers improved system control. During PWM mode operation, the device operates at a fixed frequency of 3 MHz (typ). PWM mode drives loads from ~ 80 mA to 600 mA max. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ.) during light load and standby operation. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled down), the device turns off and reduces battery consumption to 0.01 µA (typ.). The LM3677 is available in a lead-free (NOPB) 5-bump micro SMD package and 6-pin LLP package. A switching frequency of 3 MHz (typ.) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required. 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 © 2007–2008, 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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