The LM3670MF-3.3/NOPB is a miniature Step-down DC-DC Converter for ultra-low voltage circuits. It provides up to 350mA load current, over an input voltage range from 2.5 to 5.5V. This converter is available in fixed voltage output version. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. The PWM mode drives loads from ～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. In shutdown mode (Enable pin pulled low) the converter turns off and reduces battery consumption to 0.1μA (typical).
15μA Typical quiescent current
Automatic PFM/PWM mode switching
100% Duty cycle mode
Internal synchronous rectification for high efficiency
Internal soft-start
0.1μA Typical shutdown current
Operates from a single Li-ion cell or 3 dell NiMH/NiCd batteries
Only three tiny surface-mount external components required
(EN)
