XC9148 Series

Load Disconnection Function, 1.2A Step-up DC/DC Converters

XC9148 series are synchronous step-up DC/DC converters with a 0.2Ω(TYP.) N-channel driver transistor and a 0.2Ω(TYP.) synchronous P-channel switching transistor built-in. A highly efficient and stable current can be supplied up to 1.2A by reducing ON resistance of the built-in transistors.

The series are able to start operation under the condition which has 0.9V input voltage to generate 3.3V output voltage with a 22Ω(TBD) load resistor, suitable for mobile equipment using only one Alkaline battery or one Nickel metal hydride battery.

The output voltage can be set from 1.8V to 5.5V (±2.0%) in steps of 0.1V.With the built-in oscillator, either 1.2MHz or 3.0MHz can be selected for suiting to your particular application.

During the devices enter stand-by mode, A/D/G/J types prevent the application malfunction by CL Discharge Function which can quickly discharge the electric charge at the output capacitor (CL). B/E/H/K types is able to drive RTC etc. by Bypass Switch Function to maintain continuity between the input and output. C/F/I/L types is able to connect in parallel with other power supplies by Load Disconnection Function which breaks continuity between the input and output. G/H/I/J/K/L types is capable to reduce leaking potassium hydroxide by stopping IC operation while battery voltage is declining. The release voltage of UVLO is 1.6V (±3.0% accuracy).

Typical Application Circuit


Input Voltage Range 0.65V ~ 6.0V (Operation start voltage : 0.9V)
Fixed Output Voltage 1.8V ~ 5.5V (A,B,C type)
2.2V ~ 5.5V (except A,B,C type)
Oscillation Frequency 1.2MHz
Output Current 750mA @VOUT=5.0V, VBAT=3.3V
500mA @VOUT=3.3V, VBAT=1.8V
Control Mode Selection Auto PWM/PFM
Load Transient Response 100mV@VOUT=3.3V, VBAT=1.8V,
fosc=3.0MHz IOUT=1mA→200mA (tr=5μs)
Protection Function Thermal shutdown
Current Limit
Integral Latch Method (D/E/F/J/K/L Types)
Short Circuit Protection (D/E/F/J/K/L Types)
UVLO (G/H/M/J/K/L Types)
Functions Soft-start
Load Disconnection (A/C/D/F/G/I/J/L Type)
CL Auto Discharge (A/D/G/J Type)
Bypass Switch(E/H/K Type)
Output Capacitor Ceramic Capacitor
Operating Ambient Temperature -40℃ ~ +105℃
Environmentally Friendly EU RoHS Compliant, Pb Free



Technical Document