The LM3679 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell battery
and input voltage rails from 2.5V to 5.5V. It provides up to 350mA load current, over the entire input voltage range. The
LM3679 output voltage can be configured to 1.2V, 1.5V, or 1.8V.
The device offers superior features and performance for mobile phones and similar portable applications with complex power
management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system
control. During PWM mode operation, the device operates at a fixed-frequency of 3 MHz (typ). PWM mode drives loads from ~
80mA to 350mA max. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ) during light
load and standby operation. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled
low), the device turns off and reduces battery consumption to 0.01 µA (typ).
The LM3679 is available in a lead-free (No PB) 5-bump micro SMD package, 0.6mm height, and in an ultra thin 0.3mm height UR
package. Using the UR package along with specific external components, allows for a low profile solution size with a max height
of 0.55mm. A switching frequency of 3 MHz (typ) allows use of tiny surface-mount components. Only three external surface-mount
components, an inductor and two ceramic capacitors, are required. .
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