peculiarity
16μA (typical) quiescent current
Maximum load capacity of 350 mA
PWM Fixed Switching Frequency of 2 MHz (Typical)
Automatic PFM/PWM mode switching
Available in fixed and adjustable output voltages
5-bump MicroSMD package
Efficient internal synchronous rectification
Internal soft start
0.01μA (typical) shutdown current
Available from a single lithium-ion battery
Only three small external components surface mount (one inductor, two ceramic capacitors)
Current overload and thermal shutdown protection
illustrate
TheLM3673 step-down DC-to-DC converter is optimized to power a low-voltage circuit from a single lithium-ion battery and an input voltage rail 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 adjustable output voltage versions ranging from 1.1V to 3.3V.
The device provides superior performance and the performance of mobile phones and similar portable systems. The LM3673 uses intelligent automatic switching between PWM and PFM to improve efficiency. In PWM mode, the device operates at a fixed frequency of 2 MHz (typical). Hysteresis PFM mode extends battery life and reduces quiescent current to 16μA (typical) under light load and standby. Internally synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device is turned off and the power consumption is reduced to 0.01μA (typical).
The LM3673 is a tiny 5-bump MicroSMD package in both lead (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typical) allows the use of tiny surface-mount components, inductors, and two ceramic capacitors.
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mobile phone
handheld computer
MP3 player
W - LAN
Portable instrument
Digital camera
Portable hard drives