LM3670MF-ADJ/NOPB

The LM3670MF-ADJ/NOPB is a miniature step-down DC-to-DC Converter optimized for powering ultralow voltage circuits from a single Li-ion cell or three-cell NiMH/NiCd batteries. It provides up to 350mA load current, over an input voltage range from 2.5 to 5.5V. There are several different fixed voltage output options available as well as an adjustable output voltage version. The device offers superior features and performance for mobile phones. Automatic intelligent switching between pulse width modulation (PWM) low-noise and pulse frequency modulation (PFM) low-current mode offers improved system control. During full-power operation, a fixed-frequency 1MHz (typical) PWM mode drives loads from approximately 70 to 350mA maximum, with up to 95% efficiency. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 15µA (typical) during light current loads and system standby.