XC6365 Series

PWM Control, PWM/PFM Switchable Step-Down DC/DC Controller

The XC6365 series are multi-functional step-down DC/DC converters 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 0.1V 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 with the XC6366 (PWM/PFM switchable) and the series is highly efficient from light loads to large output currents. In relation to soft-start time, both internally set-up 10ms 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 UVLO internal, the external Tr. will be forcibly switched off if used below the stipulated voltage.

Typical Application Circuit


Input Voltage Range 2.2V~10V
Output Voltage Range 1.5V~6.0V (0.1V increments)
Oscillation Frequency 300kHz(±15%), Custom products 180,500kHz
Output Current More than 1.0A (VIN=5.0V,VOUT=3.0V)
High Efficiency 92%(TYP.)
Stand-by Current ISTB=0.5μA(MAX.)



Quality Reports


QuestionWhat is the standby current?

The current that flows through the IC in the standby mode. The standby mode means the state where the IC has been turned off by the CE function.

QuestionWhat does the FB product mean?

An IC for which any output voltage can be set by the reference voltage of the FB pins and the external dividing resistor. The output voltage is determined by the RFB1 and RFB2 values, using the following formula: VOUT = Vref × (RFB1 + RFB2)/RFB2

QuestionHow does UVLO (under voltage lockout) work?

This circuit forcibly turns off the driver transistor when VIN drops below the UVLO voltage. If the input voltage recovers to the value which is equal to the specified value or more, UVLO will be released to resume the switching operation. It is resumed by the soft-start function. The paused state by UVLO is not the shutdown. The pulse output is stopped, but the internal circuit is operating.