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LM3668 数据表(PDF) 1 Page - Texas Instruments |
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LM3668 数据表(HTML) 1 Page - Texas Instruments |
1 / 30 page FB 2.8V/3.3V SW1 SW2 EN LM3668 PVIN PGND SYNC/MODE VSEL L = 2.8V H = 3.3V VIN = 2.5V - 5.5V SGND VOUT VDD C2 22 2F C1 10 2F 2.2 2H NC Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3668 SNVS449O – JUNE 2007 – REVISED APRIL 2015 LM3668 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter 1 Features 2 Applications 1 • 45-µA Typical Quiescent Current • Handset Peripherals • For 2.8-V-3.3-V and 3-V-3.4-V Versions: • MP3 Players • Pre-Regulation for Linear Regulators – 1-A Maximum Load Current for VIN = 2.8 V to 5.5 V • PDAs – 800-mA Maximum Load Current for • Portable Hard Disk Drives VIN = 2.7 V • WiMax Modems – 600-mA Maximum Load Current for VIN = 2.5 V 3 Description • For 4.5 V-5 V The LM3668 is a synchronous buck-boost DC-DC converter optimized for powering low voltage circuits – 1-A Maximum Load Current for from a Li-Ion battery and input voltage rails between VIN = 3.9 V to 5.5 V 2.5 V and 5.5 V. It has the capability to support up to – 800-mA Maximum Load Current for 1-A output current over the output voltage range. The VIN = 3.4 V to 3.8 V LM3668 regulates the output voltage over the complete input voltage range by automatically – 700-mA Maximum Load Current for switching between buck or boost modes depending VIN = 3 V to 3.3 V on the input voltage. – 600-mA Maximum Load Current for The LM3668 has 2 N-channel MOSFETS and 2 P- VIN = 2.7 V to 2.9 V channel MOSFETS arranged in a topology that • 2.2-MHz PWM Fixed Switching Frequency provides continuous operation through the buck and (Typical) boost operating modes. There is a MODE pin that • Automatic PFM-PWM Mode or Forced PWM allows the user to choose between an intelligent Mode automatic PFM-PWM mode operation and forced PWM operation. During PWM mode, a fixed- • Wide Input Voltage Range: 2.5 V to 5.5 V frequency 2.2 MHz (typical) is used. PWM mode • Internal Synchronous Rectification for High drives load up to 1 A. Hysteretic PFM mode extends Efficiency the battery life through reduction of the quiescent • Internal Soft Start: 600-µs Maximum Start-Up current to 45 µA (typical) at light loads during system Time After VIN Settled standby. Internal synchronous rectification provides high efficiency. In shutdown mode (EN pin pulled • 0.01-µA Typical Shutdown Current low), the device turns off and reduces battery • Current Overload and Thermal Shutdown consumption to 0.01 µA (typical). Protection A high switching frequency of 2.2 MHz (typical) • Frequency Sync Pin: 1.6 MHz to 2.7 MHz allows the use of tiny surface-mount components including a 2.2-µH inductor, a 10-µF input capacitor, Typical Application Circuit and a 22-µF output capacitor. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) LM3668 WSON (12) 3.00 mm x 3.00 mm (1) For all available packages, see the orderable addendum at the end of the datasheet. 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. |
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类似说明 - LM3668 |
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