Ultra-Low Voltage Operation Charge Pump IC for Step-up DC-DC Converter Startup S-882Z series
The S-882Z Series is a charge pump IC for step-up DC-DC converter startup, which differs from conventional charge pump ICs, in that it uses fully depleted SOI (Silicon on Insulator) technology to enable ultra-low voltage operation.
Being capable of stepping up an extremely low input voltage of 0.3 to 0.35 V, this series enables the efficient use of very low energy levels. The stepped up electric power is stored in a startup capacitor, and it is discharged as the startup power of the step-up DC-DC converter when the startup capacitor reaches the discharge start voltage level.
Moreover, a built-in shutdown function is also provided, so that when the output voltage of the connected step-up DC-DC converter rises above a given value, the operation is stopped, thereby achieving significant power saving and battery life extension.
The S-882Z Series chips come in a small SOT-23-5 package, allowing high-density mounting.
◾Operating input voltage: 0.3 to 3.0 V
◾Current consumption: During operation 0.5 mA max. (at Vin = 0.3 V), During shutdown 0.6 µA max. (at Vin = 0.3 V)
◾Discharge start voltage: 1.8 to 2.4 V (____selectable in 0.2 V steps)
◾Shutdown voltage: Discharge start voltage + 0.1 V (fixed)
*1. The addition of a Schottky diode or a power smoothing capacitor may be necessary depending on the output smoothing capacitor value of the step-up DC-DC converter and the output voltage value. (Refer to Example of Connection with Step-up DC-DC Converter.)
◾Stepping up from low-voltage power supply such as solar cell and fuel cell
◾Stepping up internal power supply voltage of RF tag
◾Intermittent power supply to intermittently operating system