Step-Up DC/DC Controller, MAXDUTY: 93%

XC9121 Series are PWM control step-up DC/DC converter controller ICs. Since maximum duty ratio is as large as 93%, the series is the best for the applications used as high step-up ratios, such as the LCD panels and OELD. In this series, even if it is a high step-up ratio, the output voltage stabilized at high efficiency can be obtained. With 0.9V (±2.0%) of reference voltage supply internal, and using external resistors, RFB1 and RFB2, output voltage can be set up freely within a range of 1.5V to 30V.

For a current sense, with the use of RSENSE, ceramic capacitors can be used as load capacitors and allows for lower output ripple and reduced PCB area requirements.

During stand-by (when the CE pin is low), all circuits are shutdown to reduce current consumption to as low as 1.0μA or less.


Input Voltage Range0.9V~6.0V
Power Supply Voltage Range1.8V~6.0V
Output Voltage Range1.5V~30V,Can be set freely with 0.9V(±2.0V) of reference voltage supply and external registors.
Oscillation Frequency100kHz±15%
Output CurrentMore than 80mA(VIN=3.6V,VOUT=15V)
Control MethodsPWM/PFM automatic switching control
High Efficiency85%(TYP.),(VIN=3.6V,VOUT=15V,IOUT=10mA)
Stand-by CurrentISTB=1.0μA(MAX.)
Load CapacitorsLow ESR capacitors compatible

Typical Application Circuit

Quality Reports

Technical Document


Package Number of Pins Pcs/Reel Package Size(mm)
SOT-25 5 3,000 2.8 x 2.9 x 1.3
USP-6C 6 3,000 1.8 x 2.0 x 0.6

XC9121 Series Part Numbers

Part number Sample Current Limiter Function Output Voltage Oscillation Frequency Packages EDA Online Store
XC9121D091ER-G Not available FB voltage 0.9V 100kHz USP-6C
XC9121D091MR-G Not available FB voltage 0.9V 100kHz SOT-25

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