Sample & Support & Product Tools & Technical Community Buy Folder Documents Software LM3671,LM3671-Q1 SNVS294RNOVEMBER 2004REVISED NOVEMBER 2014 LM3671/-Q1 2-MHz, 600-mA Step-Down DC-DC Converter 1 Features 3 Description The LM3671 step-down DC-DC converter is 1 16-A Typical Quiescent Current optimized for powering low voltage circuits from a 600-mA Maximum Load Capability single Li-Ion cell battery and input voltage rails from 2-MHz PWM Fixed Switching Frequency (Typ.) 2.7 V to 5.5 V. It provides up to 600-mA load current, over the entire input voltage range. There are several Automatic PFM/PWM Mode Switching different fixed voltage output options available as well Internal Synchronous Rectification for High as an adjustable output voltage version range from Efficiency 1.1 V to 3.3 V. Internal Soft Start The device offers superior features and performance 0.01-A Typical Shutdown Current for mobile phones and similar portable systems. Operates from a Single Li-Ion Cell Battery Automatic intelligent switching between PWM low- noise and PFM low-current mode offers improved Only Three Tiny Surface-Mount External system control. During PWM mode, the device Components Required (One Inductor, Two operates at a fixed-frequency of 2 MHz (typ.). Ceramic Capacitors) Hysteretic PFM mode extends the battery life by Current Overload and Thermal Shutdown reducing the quiescent current to 16 A (typ.) during Protection light load and standby operation. Internal Available in Fixed Output Voltages and Adjustable synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the Version device turns off and reduces battery consumption to LM3671-Q1 is an AEC-Q100 Grade 1 Qualified 0.01 A (typ.). Automotive Grade Product A high-switching frequency of 2 MHz (typ.) allows use of tiny surface-mount components. Only three 2 Applications external surface-mount components, an inductor, and Mobile Phones two ceramic capacitors, are required. PDAs (1) Device Information MP3 Players PART NUMBER PACKAGE BODY SIZE W-LAN LM3671 USON (6) 2.00 mm x 2.00 mm (NOM) Portable Instruments SOT-23 (5) 2.90 mm x 1.60 mm (NOM) LM3671 Digital Still Cameras LM3671-Q1 DSBGA (5) 1.413 mm x 1.083 mm (MAX) Portable Hard Disk Drives (1) For all available packages, see the orderable addendum at Automotive the end of the datasheet. Typical Application Circuit: Fixed-Voltage Typical Application Circuit: ADJ V IN V IN L1: 2.2 PH L1: 2.2 PH 2.7V to 5.5V V V OUT 2.7V to 5.5V IN V V SW IN OUT SW 1 5 1 5 C OUT C C IN LM3671- OUT C IN R1 C1 LM3671 10 PF 4.7 PF ADJ 10 PF GND GND 4.7 PF 2 2 C2 R2 EN FB EN FB 3 4 3 4 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.LM3671,LM3671-Q1 SNVS294RNOVEMBER 2004REVISED NOVEMBER 2014 www.ti.com Table of Contents 7.4 Device Functional Modes........................................ 13 1 Features.................................................................. 1 8 Application and Implementation........................ 16 2 Applications........................................................... 1 8.1 Application Information............................................ 16 3 Description............................................................. 1 8.2 Typical Application.................................................. 16 4 Revision History..................................................... 2 9 Power Supply Recommendations...................... 21 5 Pin Configuration and Functions......................... 3 10 Layout................................................................... 21 6 Specifications......................................................... 4 10.1 Layout Guidelines................................................. 21 6.1 Absolute Maximum Ratings...................................... 4 10.2 Layout Example.................................................... 22 6.2 Handling Ratings: LM3671........................................ 4 10.3 DSBGA Package Assembly and Use................... 22 6.3 Handling Ratings: LM3671-Q1.................................. 4 11 Device and Documentation Support................. 23 6.4 Recommended Operating Conditions....................... 5 11.1 Device Support...................................................... 23 6.5 Thermal Information.................................................. 5 11.2 Documentation Support........................................ 23 6.6 Dissipation Ratings................................................... 5 11.3 Related Links........................................................ 23 6.7 Electrical Characteristics........................................... 6 11.4 Trademarks........................................................... 23 6.8 Typical Characteristics.............................................. 7 11.5 Electrostatic Discharge Caution............................ 23 7 Detailed Description............................................ 12 11.6 Glossary................................................................ 23 7.1 Overview................................................................. 12 12 Mechanical, Packaging, and Orderable 7.2 Functional Block Diagram....................................... 12 Information........................................................... 23 7.3 Feature Description................................................. 13 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision Q (November 2013) to Revision R Page Added Device Information and Handling Rating tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable Information sections moved some curves to Application Curves section ............. 1 Changes from Revision O (April 2013) to Revision P Page Changed layout of National Data Sheet to TI format........................................................................................................... 22 2 Submit Documentation Feedback Copyright 20042014, Texas Instruments Incorporated Product Folder Links: LM3671 LM3671-Q1