National Semiconductor’s Tiny 2 MHz, 600 mA DC-DC Converter Maximizes Battery Life in Portable Devices

National Semiconductor's Tiny 2 MHz, 600 mA DC-DC Converter Maximizes Battery Life in Portable Devices

National Semiconductor Corporation introduced a 2 MHz, pulse-width modulation (PWM), 600 mA step-down DC-DC converter in a very small package. The LM3674 is well-suited for handheld devices such as mobile phones, PDAs, MP3 players, portable instruments, W-LAN, digital still cameras and portable hard disk drives.

Highly Efficient Step-down Converter Features Low Ripple, Low Noise

The LM3674 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to a 600 mA load current over the entire input voltage range.

During PWM operation, the device operates in a low-noise fixed frequency mode with a peak-to-peak output voltage ripple of less than 5 mV. Internal synchronous rectification provides high efficiency during PWM operation. In shutdown, the device turns off and reduces battery consumption to 0.01 µA (typ).