• 45-µA Typical Quiescent Current
• For 2.8-V-3.3-V and 3-V-3.4-V Versions:
  • 1-A Maximum Load Current for VIN = 2.8 V to 5.5 V
  • 800-mA Maximum Load Current for VIN = 2.7 V
  • 600-mA Maximum Load Current for VIN = 2.5 V
• For 4.5 V-5 V
  • 1-A Maximum Load Current for VIN = 3.9 V to 5.5 V
  • 800-mA Maximum Load Current for VIN = 3.4 V to 3.8 V
  • 700-mA Maximum Load Current for VIN = 3 V to 3.3 V
  • 600-mA Maximum Load Current for VIN = 2.7 V to 2.9 V
• 2.2-MHz PWM Fixed Switching Frequency (Typical)
• Automatic PFM-PWM Mode or Forced PWM Mode
• Wide Input Voltage Range: 2.5 V to 5.5 V
• Internal Synchronous Rectification for High Efficiency
• Internal Soft Start: 600-µs Maximum Start-Up Time After VIN Settled
• 0.01-µA Typical Shutdown Current
• Current Overload and Thermal Shutdown Protection
• Frequency Sync Pin: 1.6 MHz to 2.7 MHz

Typical Application Circuit

• Handset Peripherals
• MP3 Players
• Pre-Regulation for Linear Regulators
• PDAs
• Portable Hard Disk Drives
• WiMax Modems

The LM3668 is a synchronous buck-boost DC-DC converter optimized for powering low voltage circuits from a Li-Ion battery and input voltage rails between 2.5 V and 5.5 V. It has the capability to support up to 1-A output current over the output voltage range. The LM3668 regulates the output voltage over the complete input voltage range by automatically switching between buck or boost modes depending on the input voltage.

The LM3668 has 2 N-channel MOSFETS and 2 P-channel MOSFETS arranged in a topology that provides continuous operation through the buck and boost operating modes. There is a MODE pin that allows the user to choose between an intelligent automatic PFM-PWM mode operation and forced PWM operation. During PWM mode, a fixed-frequency 2.2 MHz (typical) is used. PWM mode drives load up to 1 A. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 45 µA (typical) at light loads during system standby. Internal synchronous rectification provides high efficiency. In shutdown mode (EN pin pulled low), the device turns off and reduces battery consumption to 0.01 µA (typical).

A high switching frequency of 2.2 MHz (typical) allows the use of tiny surface-mount components including a 2.2-µH inductor, a 10-µF input capacitor, and a 22-µF output capacitor.