The LM3670MF-1.8/NOPB is a miniature step-down DC-to-DC Converter for ultra-low voltage circuits. It is 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. It offers superior features and performance for mobile phones and similar portable applications with complex power management systems. 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. Internal synchronous rectification provides high efficiency.
● Automatic PFM and PWM mode switching
● Internal synchronous rectification for high efficiency
● Internal soft-start
● Current overload protection
● Operates from a single li-ion cell or three-cell NiMH/NiCd batteries
● Only three tiny surface-mount external components required (one inductor, two ceramic capacitors)
● 15µA Typical quiescent current
● 350mA Maximum load capability
● 0.1µA Typical shutdown current
● 100% Duty cycle mode low dropout operation
● Green product and no Sb/Br
