PFM Control, Step-Up Synchronous DC/DC Converter
The XC9140 series are step-up synchronous DC/DC converters that support ceramic capacitors and have an internal 0.6Ω (TYP.) Nch driver transistor and an internal 0.65Ω (TYP.) Pch synchronous rectifier switch transistor. PFM control enables a low quiescent current, making these products ideal for portable devices that require high efficiency.
When the output voltage is 3.3V and the output current is 1mA, startup from an input voltage of VBAT=0.9V is possible which means that the XC9140 can be used in applications that start from a single alkaline or nickel-metal hydride battery. The output voltage can be set from 1.8V to 5.0V (±2.0%) in steps of 0.1V.
The XC9140 features a load disconnect function to break continuity between the input and output at shutdown (XC9140A), and also a bypass mode function to maintain continuity between the input and output (XC9140C).
A version with a UVLO (Under Voltage Lock Out) function will also be available (currently under development) which enables the prevention of battery leakage by stopping the IC’s operation when the input voltage is low. The standard product will have a UVLO release voltage of 2.15V (±3.0%) and a custom version with a UVLO release voltage selectable from between 1.65V to 2.2V, in steps of 0.05V, will also be made available.
Typical Application Circuit
|Input Voltage Range||0.9V~5.5V|
|Output Voltage Range||1.8V~5.0V(±2.0%), (0.1V increments)|
|Output Current||100mA@VOUT=3.3V, VBAT=1.8V(TYP.|
|Driver Transistor||0.6Ω(N-ch driver transistor)
0.65Ω(P-ch Switching Transistor)
|High Speed Transient||50mV@VOUT=3.3V, VBAT=1.8V, IOUT=1→100mA|
|PFM Switching Current||350mA|
|Functions||Load Disconnection Function
Bypass Mode Function
|Operating Ambient Temperature||-40℃～+85℃|
|Environmentally Friendly||EU RoHS compliant, Pb free|