The LM3691 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1A load current, over an input voltage range from 2.3V to 5.5V. There are several different fixed voltage output options available.
LM3691 has a mode-control pin that allows the user to select Forced PWM mode or ECO mode that changes modes between gated PWM mode and PWM automatically depending on the load. In ECO, LM3691 offers superior efficiency and very low Iq under light load conditions. ECO mode extends the battery life through reduction of the quiescent current during light load conditions and system standby.
The LM3691 is available in a 6-bump DSBGA package. Only three external surface-mount components, a 1 μH inductor, a 4.7 μF input capacitor and a 4.7 μF output capacitor, are required.
VOUT = 0.75V to 3.3V
±1% DC Output Voltage Precision
2.3V ≤ VIN ≤ 5.5V
4 MHz Switching Frequency
64 μA (typ.) Quiescent Current in ECO Mode
1A Maximum Load Capability
Automatic ECO/PWM Mode Switching
Mode Pin to Select ECO/Forced PWM Mode
1 μH Inductor, 4.7 μF Input Capacitor (0603(1608) Case Size) and 4.7 μF Output Capacitor (0603(1608) Case Size)
Current Overload and Thermal Shutdown Protections
Only Three Tiny Surface-Mount External Components Required (Solution Size Less Than 15 mm2)