LM3673TLX-ADJ

• 16μA typical quiescent current
• 350 mAh maximum load capacity
• 2 MHz Fixed Switching Frequency PWM (Typical)
• Automatic PFM/PWM mode switching
• Available in fixed and adjustable output voltages
• 5-bump MicroSMD package
• Internally synchronized rectification for high efficiency
• Internal soft start
• 0.01μA typical shutdown current
• Works on a single lithium-ion battery
• Only three tiny surface-mount external components (one inductor, two ceramic capacitors)
• Current overload and thermal shutdown protection

illustrate

The LM3673 step-down DC-DC converter is optimized for power supply from a single lithium-ion battery and input voltage rail low-voltage circuit from 2.7V to 5.5V. It can provide up to 350mA of load current over the entire input voltage range. Several different fixed output voltages are available, as well as an adjustable output voltage range from 1.1V to version 3.3.

The device offers superior functionality and performance for mobile phones and similar portable systems. The LM3673 uses intelligent automatic switching between PWM and PFM for improved efficiency. In PWM mode, the device operates at a fixed frequency of 2 MHz (typical). Hysteresis PFM mode extends battery life at light loads, reducing standby operation, and quiescent current of 16μA (typical). Internally synchronous rectification PWM mode provides high efficiency during operation. In shutdown mode, the device shuts down, reducing battery consumption to 0.01μA (typical).

The LM3673 is available in a tiny 5-bump in lead (PB) and lead-free (NO PB) versions of the MicroSMD package. The high switching frequency of 2 MHz (typical) allows for three tiny surface mount components, an inductor and two ceramic capacitors.

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• mobile phone
• handheld computer
• MP3 player
• W - LAN
• Portable instrument
• Digital camera
• Portable hard drives