XCL303 Series

Inductor Built-in Negative Output Voltage “micro DC/DC” Converters

The XCL303 series are small coil-integrated negative voltage micro DC/DC converter IC. The oscillating frequency is a fast 2.5MHz and the small 2.5 x 2.0 x 1.0mm package contributes significantly to space saving in PCB area.

Further, integrating the coil together with the DC/DC simplifies the circuit board layout and minimizes potential noise interference. Compared to a charge pump type solution, the switching method of the XCL303/XCL304 maintains a stable output voltage even when the input voltage fluctuates. In addition, this new micro DC/DC can support larger output current than a charge pump solution.

The PWM controlled XCL303 series can be selected for applications where low noise is important, and the PWM/PFM automatic switching controlled XCL304 series can be selected for applications where high efficiency at light load current and low noise at high load current is important.

The XCL303 series allows users to select either a PWM control or PWM/PFM automatic switching control method, which are optimum for applications where low noise and high efficiency are important.

Output voltage can be adjusted within the range of -1.2V to -6.0V using externally mounted resistors.

Typical Application Circuit


Input Voltage Range 2.7V~5.5V
Output Voltage Range -1.2V ~ -6.0V
FB Voltage 0.5V ± 10mV
VREFVoltage 1.6V ± 40mV
Output Current 250mA @VOUT=-3.0V, VIN=3.3V
Quiescent Current 250μA (TYP.)
Control Methods PWM Control
Oscillation Frequency 2.5MHz
Protection Function Current Limit (1.1A TYP.)
Function Soft Start Time External Adjustment
Operating Ambient Temperature -40 ~ +105℃
Environmentally Friendly EU RoHS Compliant, Pb Free



Technical Document