DESCRIPTION
The UTC Besides, this circuit provides a stable and high efficient operation over a wide range of load currents. The UTC UC3551 features high switching rate which is up to 450 KHz, making the external component counts less required. Moreover, it features 17μA low quiescent current, which makes the battery life longer. The low start-up input voltage below 1V makes UTC UC3551 suitable for 1 to 4 battery cells applications of providing up to 300mA output current. Two external resistors determine the value of the output voltage. The external power devices (NMOS or NPN) are derived by both internal 2A switch and driver. The UTC UC3551 is intended to be used in PDA, DSC, LCD Panel, RF-Tags, MP3, portable instrument and wireless equipment. FEATURES
* Low Start-up Input Voltage is as Low as 1.0V * Efficiency up to 90% * High Supply Capability to Deliver 3.3V 100mA with 1 Alkaline Cell * Quiescent (Switch-off) Supply Current: 17µA * Zero Shutdown Mode Supply Current * Fixed Switch...
Unisonic Technologies
