www.DataSheet4U.com
LM3673 2MHz, 350mA Step-Down DC-DC Converter
November 2006
LM3673 2MHz, 350mA Step-Down DC-DC Con...
www.DataSheet4U.com
LM3673 2MHz, 350mA Step-Down DC-DC Converter
November 2006
LM3673 2MHz, 350mA Step-Down DC-DC Converter
General Description
The LM3673 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 350mA load current, over the entire input
voltage range. There are several different fixed
voltage output options available as well as an adjustable output
voltage version ranging from 1.1V to 3.3V. The device offers superior features and performance for mobile phones and similar portable systems. The LM3673 uses intelligent automatic switching between PWM and PFM for better efficiency. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ). 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 during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typ). The LM3673 is available in a tiny 5-bump MicroSMD package in leaded (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typ) allows the use of three tiny surface-mount components, an inductor and two ceramic
capacitors.
Features
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16 µA typical quiescent current 350 mA maximum load capability 2 MHz PWM fixed switching frequency (typ) Automatic PFM/PWM mo...