Products - Step-Down

PWM/PFM Step-Down DC/DC Controller

This part is not recommended for new designs, please use XC9221

The XC6366 series are multi-functional step-down DC/DC controllers with built-in high speed, low ON resistance drivers. An output current of more than 1A is possible using an externally connected transistor, coil, diode and capacitor. 

Output voltage is programmable in 100mV steps between 1.5V to 6.0V (VOUT) (±2.5% accuracy). Further, with 1.0V of standard voltage supply internal and using externally connected components, output voltage can be set up freely (FB). With a 300kHz switching frequency, the size of the external components can be reduced.

Control switches from PWM to PFM during light loads and the series is highly efficient from light loads to large output currents. In relation to soft-start time, both internally set-up 10msec types (A,B) and external resistor or capacitor regulated types (C,D) are available. During stand-by time (CE pin "Low" ), current consumption is reduced to less than 0.5μA. With U.V.L.O internal, the external Tr. will be forcibly switched off if used below the stipulated voltage.

Features:

• Input Voltage Range: 2.2V~10V
• Output Voltage Range: 1.5V ~ 6.0V (100mV steps)
• Switching Frequency: 180kHz, 300kHz or 500kHz
• Output Current: >1.0A
• High Efficiency: 92% (typ.)
• Stand-by Capability: ISTB=0.5μA (max.)
• Soft-start time can be set-up externally