- 16μA typical quiescent current
- 350 mA maximum load capacity
- 2 MHz fixed switching frequency PWM (typical)
- Automatic PFM/PWM mode switching
- Available in fixed and adjustable output voltages
- 5 solder ball MicroSMD package
- Internal synchronous rectification for high efficiency
- Internal soft start
- 0.01μA typical shutdown current
- Operates on single-cell lithium-ion batteries
- 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-cell Li-Ion battery and input voltage rail to a low-voltage circuit from 2.7V to 5.5V. It can deliver 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 in mobile phones and similar portable systems. Intelligent automatic switching between the LM3673 PWM and PFM improves efficiency. In PWM mode, the device operates at a fixed frequency of 2 MHz (typical). Hysteretic PFM mode extends battery life at light loads, reduced standby operation, and quiescent current of 16μA (typical). Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device shuts down, reducing battery consumption to 0.01μA (typical).
The LM3673 is available in a tiny 5 solder ball in lead (PB) and lead (no PB) versions in MicroSMD packages. The high switching frequency of 2 MHz (typical) allows three tiny surface mount components, an inductor, and two ceramic capacitors.
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- mobile phone
- Pocket PC
- MP3 player
- W - LAN
- Portable instrument
- Digital cameras
- Portable hard drives
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