LM3677 3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
March 2007
LM3677 3MHz, 600mA Mi...
LM3677 3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low
Voltage Circuits
March 2007
LM3677 3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low
Voltage Circuits
General Description
The LM3677 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 2.7V to 5.5V. It provides up to 600mA load current, over the entire input
voltage range. The LM3677 is configured to four output
voltages of 1.3V, 1.5V, 1.8V and 2.5V. 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 600mA 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 down), the device turns off and reduces battery consumption to 0.01 µA (typ). The LM3677 is available in a lead-free (NO PB) 5-bump micro SMD package. 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.
Features
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