Charger Pump
NU2121
The NU2121 is a standalone, bi-directional switched capacitor converter with integrated power switches that delivers 10A output current to forward (2:1 conversion) direction and 5A output current to reverse direction (1:2 conversion). This architecture and the integrated FETs are optimized to enable a 50% duty cycle in fixed frequency mode. The NU2121 consumes low quiescent current of 50uA (typical) in switching mode with 0A load or 14uA in low power mode. The optimized skip control scheme improves the efficiency of the light load greatly. The NU2121 is available in a tiny lead-free 0.4 mm pitch 7x6 pin WLCSP package. Its high switching frequency up to 1MHz reduces the capacitor size and further minimizes the circuit footprint.
