XCL103 Series

Inductor Built-in Step-up “micro DC/DC” Converter (micro DC/DC)

The XCL103 series is a synchronous step-up micro DC/DC converter which integrates an inductor and a control IC in one tiny package (2.0mm×2.5mm, h=1.0mm). A stable step-up power supply is configured using only two capacitors connected externally. An internal coil simplifies the circuit and enables minimization of noise and other operational trouble due to the circuit wiring.

A wide operating voltage range of 0.9V to 6.0V enables support for applications that require an internally fixed output voltage (2.2V to 5.5V).

During the devices enter stand-by mode, XCL103D type prevent the application malfunction by CL Discharge Function which can quickly discharge the electric charge at the output capacitor (CL). XCL103E type is able to drive Real Time Clock etc.

Typical Application Circuit


Input Voltage Range 0.9V ~ 6.0V
Output Voltage Range 2.2V ~ 5.5V (±2.0%)
0.1V increments
Input Current 0.8A
Output Current 500mA@VOUT=5.0V, VBAT=3.3V (TYP.)
350mA@VOUT=3.3V, VBAT=1.8V (TYP.)
Control Mode Selection Auto PWM/PFM
Oscillation Frequency 3.0MHz (±20%)
Protection Circuits Over-current limit (Integral latch method)
Output short-circuit protection
Functions Soft-start
Load Disconnection Function (D type)
CL Auto Discharge Function (D type)
Bypass Switch Function (E type)
Operating Ambient Temperature -40 ~ +85℃
Environmentally Friendly EU RoHS Compliant, Pb Free



Technical Document


QuestionWhat is the soft-start function?

The function to soften the rise to prevent the inrush current.

QuestionHow does the CL discharge function work?

The function rapidly releases the charge remained in the CL capacitor to make the VOUT pin voltage zero. The VOUT pin voltage does not reach zero immediately after being turned off by the CE function due to the charge remained in the connected CL capacitor. While the charge in the CL capacitor is gradually reaching zero, the LSI continues operating and does not work with the CE pin signal, which may cause a malfunction. This is why the discharge is required when turning off the CE pin. A larger capacitance of the capacitor needs longer time to be discharged.

QuestionWhat does CL mean?

Load capacitor. Other companies often refer to it as COUT.